Power Line Contractors, Inc. Response to National Grid Request for Proposalattachment – Solar Phaseag 1-3-Redacted II Initiative Page 574 of 859

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 574 of 859

4.4.2 Handheld Database Tool Installation is typically managed using a handheld tool capable of recording GPS coordinates, taking photographs, scanning barcodes and data-basing typed or written information. Database information stored on the handheld device is then transferred to the master IntelliView database via secure Internet connection. Optionally, the installer may manage the installation database prior to transfer to IntelliView to ensure completeness. Figure 10 and Figure 11 show sample screens of such an interim database from a Petra Systems installation.

Figure 10. Database View of Pole Mount Installation Data

Figure 1 shows the main database listing including the type of work performed, pole number, GPS location, GIS information such as map grid number, device serial number, installation height and azimuth, and installer information. Figure 11 shows a ground level picture of the installation and an image of the distribution secondary splice drip loop to confirm proper installation.

18 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 575 of 859

Figure 11. Database View of Pole Mount Installation Data

4.4.3 Pole-mount Installation Summary A detailed installation guide is available from Petra Systems for pole-mount installation of the SunWave AC module PV solar unit. Typically, solar units are assembled at a staging area and transported by the installation crews to pole locations for installation. Installation is generally performed using a bucket truck and a two man team. Experienced crews regularly install a unit in 20 to 25 minutes from parking to driving away. The process is summarized here.

 Park, deploy safety cones, ready solar unit and bucket  Locate height and azimuth for installation  Mark and drill pole for rack hangar bracket (“wing/arm assembly”)  Hoist and hang solar unit on bracket  Fasten the solar unit in place  Splice the solar unit AC cable into the 120VAC distribution line with drip loop  Dress the cable along the pole and coil excess cable  Connect the AC cable to the SEM output pigtail  Wait 5 minutes for UL 1741 safety timer to elapse and power generation to begin  Confirm AC output of solar unit using clamp-on inductive AC ammeter  Clean area of any waste, remove cones, depart for next installation

19 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 576 of 859

4.5 Commissioning Procedure Commissioning for Petra Systems pole-mount solar solutions is achieved incrementally as units are deployed. The first steps in commissioning are handled at time of install. As the unit is connected to the secondary distribution line and the 5 minute safety time expires (per UL1741), the unit is tested via ammeter for operation. At the same time, data regarding the installation is acquired and databased, generally via handheld computer. The database information for installations is checked and then applied to the system database for the entire deployment(s). NOC personnel then monitor energy production of each unit for a set period of time (part of customer agreement), often 30 days, to ensure proper functioning.

4.6 Development Schedule The detailed schedule for engineering, procurement and construction of each PV system is incorporated with this proposal as a separate document uploaded to the National Grid ARIBA system.

5 Operation and Maintenance PLC, will contract with Petra Systems to provide operations monitoring and data hosting services for the required five year duration of the program. PLC will provide direct maintenance as required.

Petra Systems Intelligent O&M Services comprise the Network Operations Center (NOC) services and IntelliView. The Petra Systems offering features remote monitoring services, energy production reporting and advanced data analytics coupled with highly skilled management of Petra’s SunWave smart solar energy solutions. This powerful combination allows customers to intelligently manage their PV systems by maximizing energy production, minimizing downtime, and ensuring maximum return on PV investments.

5.1 Network Operations Services The Petra Systems NOC services leverage the expertise of the Petra Systems trained technical staff to be the first line of defense in managing, monitoring and troubleshooting the system. This model allows customers to focus on other key functions of their operations, while deriving full benefits from their investment.

Petra Systems provides data hosting, data management and support services for SunWave data, including providing user access via the Petra Systems IntelliView platform. Petra Systems operates and maintains solar smart grid deployments from its New Jersey network operations center (NOC). The functions to be performed by Petra Systems as part of operations are as follows:

 IntelliView Access. The ability to remotely manage the network and assets are enabled by having access to IntelliView.  Hosting Services. Petra Systems will provide hosting services as part of the NOC services which enable the secure hosting of data associated with the network and energy management systems. Network Engineers will support this service to ensure reliability of data/information is continually accessible to the customer.

20 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 577 of 859

 Data Storage. Storing data for a period of time is important for the management and technical teams alike. With historical data, issues, alerts and other relevant information is readily accessible for reporting, troubleshooting and even forecasting. Petra Systems will work with the customer to ensure that the guaranteed period of time for Data Storage is adequate for their specific application and organizational needs.  Secure VPN. Petra Systems will ensure secure connection to the data center by Virtual Private Network (VPN). This will ensure that only authorized users are able to have access to data which may be private or critical.  Configuration Management. Petra Systems NOC personnel will maintain device and system configuration details, ensuring the all associated information is acquired and logged. This will be performed upon installation. In the event a change is required, the NOC personnel will communicate with required party requesting the change, ensure that all affected parties are notified of the request, and ensure that the impact of the change is addressed and approved. The NOC personnel will update changes to the configuration as required.  Provisioning. Installation information required to be entered into IntelliView, in order to activate each end device and over-all system will be performed during provisioning.  Technical Support. If issues arise when the end devices are installed, the NOC personnel will provide their expertise to assist the customer’s operations center in troubleshooting issues to lead to resolutions. This level of support can also be available for maintenance of the system.  Field Deployment Verification. NOC personnel will verify that the designed system parameters, both energy and network actual, are comparable to the actual installed data. If the variances are out of range, the NOC personnel will perform the required analysis to determine what steps are needed to meet the required thresholds.  Burn In. NOC personnel will ensure units that each unit which undergoes a field acceptance test, subsequently undergoes a burn-in test. This is a monitoring 30-day period, where initial accepted values are compared and evaluated, to ensure that each parameter meets expected thresholds. This testing process gives another layer of assurance that the system, as installed at each location operates reliability.  Periodic Preventative Maintenance. On a periodic basis, typically every quarter, the system is ‘scrubbed’ to evaluate how units are performing. A view of a snapshot of network and energy performance is also trended over this period, giving the ability to identify issues before an outage or loss of generation occurs. Failed equipment identification, remote upgrades for system patches are performed as part of this process.  Triaging. NOC personnel will identify issues and route resolution requests to appropriate parties efficiently, thereby reducing resultant resolution time.  Troubleshooting. NOC personnel will use all steps in as network managers to understand nature of each identified issue and ultimately determine the root cause. Subsequent identification of problem resolution will be performed  Operations and Maintenance Dispatch. NOC personnel will contact (via phone or email as appropriate) and follow-up with Customer Field Personnel, until adequate problem resolution occurs.

21 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 578 of 859

 Reporting. Monthly status report will be created and generated, providing information on Energy Settlement, Installation Status, Network Health and other management required data.  RMA. NOC personnel will investigate failures and identify when units are required to be returned to manufacturer. Since the Return Material Authorization (RMA) will be identified and addressed by Petra Systems, the process may take place in a more efficient manner.  System Access Administration. Petra Systems NOC personnel will manage user administration – personnel logins, passwords etc.

5.1.1 Network Operations Center The Network Operations Center (NOC) is a state of the art, secure facility at Petra Systems in New Jersey which houses the highly trained and skilled personnel, equipment and applications utilized to manage and/or support the smart grid network and assets. The NOC enables engineers to monitor the deployed assets, coordinate activities, as well as investigate any potential performance and communications alerts. Petra Systems provides a system solution that has a distributed architecture to allow for scalability and superior performance. Figure 12 shows a photograph of actual operations at the Petra Systems NOC in New Jersey.

Figure 12. Petra Systems Operations and Support Engineers 5.2 Maintenance Necessary field maintenance of the projects shall be completed by PLC.

One of the significant advantages of the Petra Systems pole mount solution is that it requires no scheduled field maintenance. Additionally, the system is inherently reliable as a single unit, or even several unit, failure does not affect the performance of the remainder of the system. See Appendix O.7 and Appendix O.9 for more detail.

22 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 579 of 859

6 Pricing Formal pricing is provided in the Solar PV Array Info Sheet (RFP Attachment 2) which is incorporated with this proposal as an MS Excel spreadsheet uploaded to the National Grid ARIBA system.

6.1 Pricing Discounts Applicable price discounts are listed in Solar PV Array Info Sheet (RFP Attachment 2) which is incorporated with this proposal as an MS Excel spreadsheet uploaded to the National Grid ARIBA system.

7 Conclusion Power Line Contractors, Inc. believes that the proposed development of 3.0 megawatts (MW) of solar photovoltaic power generation capacity on National Grid utility pole assets will provide National Grid with the best opportunity to provide energy cost reduction through renewable means while including the capability to monitor and measure savings, and support advanced inverter features for grid modernization efforts.

Please note the summaries of compliance and additional information provided in the attached appendixes as well as other information incorporated into this proposal as separate files on the National Grid ARIBA system.

PLC thanks National Grid for the opportunity to participate in the proposal process for the Solar Phase II Initiative and for the time taken to evaluate this proposal. PLC is prepared to answer any questions or provide additional information as necessary.

23 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 580 of 859

Appendix A – Site/Location Compliance Table 2 lists the Site and Location Requirements from Section 9.1 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 2. Site/Location Compliance Item Requirement Compliance/Comment 1 The Bidder shall coordinate with the host municipality and Will comply. shall be fully responsible for obtaining any planning, building, electrical, zoning, access, and other land use or occupancy permits that may be required in connection with the development. In addition, all fees and charges associated with obtaining permits and approvals are the responsibility of the Bidder. 2 All systems must be installed in accordance with all local, Will comply. state, and federal codes and regulations. The Bidder shall have a professional engineering firm that is licensed to practice engineering in the state of Massachusetts sign off on the design and must certify that the system is designed and built in accordance with all local, state, and federal codes. 3 The Bidder shall be fully responsible for all permitting Will comply. required for the design, construction, operation, and interconnection with the utility of the facility, and shall be responsible for compliance with any conditions resulting from a permit issued in connection with each proposed development. 4 Work shall be in accordance with NFPA 70, version Will comply. adopted by local jurisdiction, and the editions, revisions, amendments, or supplements of applicable statutes, ordinances, codes, or regulations of Federal, State, and Local Authorities having jurisdiction in effect on the date bids are received. 5 Where approval standards have been established by Will comply. OSHA, UL, ASME, AGA, AMCA, ANSI, ARI, NFPA (e.g., 70E), State Fire Insurance Regulatory Body, and FM proposals shall follow these standards. 6 Each site will be required to have a lockable and O&M is performed remotely via weatherproof box that will house a copy of the O&M secure web browser. All manual for the site and a copy of the system as-built information provided online. The drawings. proposed deployment is distributed on National Grid utility poles making local boxes unnecessary.

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Item Requirement Compliance/Comment 7 The Bidder will be responsible for providing a secure Security is provided by height from system/site and for providing keys or a method of ground on utility pole as well as unobstructed access for the company during and after individual panel connection in construction. remote monitor, IntelliView causing an alert if disconnected. 8 A convenience outlet at 120v/20 amp to provide power The proposed deployment is for test equipment and other diagnostic equipment shall distributed on National Grid utility be installed within fifteen feet of each inverter. poles. Necessary test equipment is generally carried by lineman or in bucket. No convenience outlet will be provided. 9 Equipment enclosures shall be suitable for outdoor Will comply. installation in New England, subject to sun, rain, wind, snow, etc. 10 For equipment located inside a host building or structure, Not applicable. All equipment will adequate access and lighting must be provided. be deployed on utility poles. 11 Perform all site clearing, earthwork, and grading in such a Will comply. No site clearing should manner to avoid any flooding, ponding or erosional be necessary other than possible damage on and off of the project location. limited tree branch clearing. 12 Site must have suitable groundcover such that erosion of Not Applicable. Deploying on site soils does not occur. existing National Grid utility poles eliminates such site issues. 13 Solar PV Array must be shade free between 10 AM and 2 Will comply. PM on Winter Solstice 14 If a roof mounted system has components that require a Not applicable. Deployment on harness to safely access or that are within ten feet of the National Grid utility poles accessed edge of a roof, permanent anchor points for safety by bucket truck or climbing harness tethering shall be provided lineman. 15 Roof mounted systems shall be designed such that Not Applicable. No roof mount walkways are left to access all parts of the roof or any systems. equipment on the roof 16 Permanent roof access should be made via a ladder that Not Applicable. No roof mount can be locked systems. 17 Bidders must provide a qualified roofing professional’s Not Applicable. No roof mount evaluation of the roofing material with an estimate of the systems. likely remaining useful life of the roof. Any roof being considered must not need replacement for at least seven years from the start date of the lease 18 Avoid shading from vegetation, existing obstructions Will comply. (stacks, vents, chimney, etc.) or nearby buildings 19 Remain within acceptable ranges for wind and snow loads Will comply. 20 Bidders are required to ensure that the installation of Not Applicable. No roof mount rooftop solar energy systems will not adversely impact systems. roof integrity or violate existing roof warranties

A-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 582 of 859

Item Requirement Compliance/Comment 21 Ground mounted systems shall require an eight foot high, Not Applicable. No ground mount one-inch mesh chain link fencing with locking sixteen foot systems. gates such that it encompasses the entire Solar PV Array. Fence must allow access around array for O&M and emergency access. 22 The fence should meet or exceed the Chain Link Fence Not Applicable. No ground mount Manufacturer Institute (CLFMI) guidelines and comply systems. with the American Standards and Testing Materials (ASTM International), and related Federal Specifications for all security chain link fence materials and installation. 23 Material for fence posts should be Type ll round posts cold Not Applicable. No ground mount formed, having minimum yield strength of 50,000 P.S.I. systems. Vertical line fence posts should be no less than two and three-eights (2 3/8) inches O.D. Corner posts and terminal posts should be no less than two and seven-eights (2 7/8) inches O.D. Post Braces should be provided for each gate, corner pull, and end post. Brace should be a round tubular brace extending to the adjacent vertical line fence posts at mid-height of the fence fabric with a truss rod not less than five-sixteenth (5/16) inch diameter. Each truss rod should be equipped with a turnbuckle to accommodate adjustment. 24 The fence should be able to resist winds of sixty (60) mph Not Applicable. No ground mount with a point three-five (0.35) coefficient factor for wind systems. gusts and ice. Based on CLFMI guidelines, horizontal rails should be installed to secure the fence along the bottom. Install a top tension wire at the top edge of the fence. Install an additional rail at the mid-point of the fence for one (1) inch mesh. 25 The fence must extend to within two (2) inches of firm Not Applicable. No ground mount ground and be installed below the surface if the soil is systems. sandy, or easily shifted by the weather. Ditches, troughs, and dips in the topography must be filled in with fine soil, or culverts should be installed to prevent washouts. In general, any opening greater than three (3) inches must be secured.

A-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 583 of 859

Appendix B – Electrical Design Compliance Table 3 lists the Electrical Design Requirements from Section 9.2 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 3. Electrical Design Compliance Item Requirement Compliance/Comment 1 Conduit shall be rigid galvanized steel (RGS) for aboveground Not Applicable. Utility pole mounted PV installations and transitions (e.g., 90-degree sweeps from units splice to distribution secondary below-grade to aboveground). using plastic guard on pole to cover exposed wiring from PV unit to interconnection point. 2 Schedule 40 PVC for below-grade installations unless otherwise Not Applicable. Utility pole mounted PV approved. units have no below-grade installation. 3 String combiner boxes must include properly-sized fusing, and Will comply. all metal equipment components must be bonded and grounded as required by NEC. 4 Outdoor electrical equipment, including but not limited to, Will comply. disconnects and combiners shall have NEMA Type 3R or NEMA Type 4 ratings and be UL Listed. 5 PV modules should be installed in a single contiguous area, with Will comply with minimum loss no more than 2% DC loss from the array to inverter equipment. requirement. PV unit deployment is to be distributed on National Grid utility poles. 6 Fasteners and hardware throughout the system shall be Will comply. stainless steel or materials of equivalent corrosion resistance 7 Unprotected steel shall not to be used in any components Will comply. 8 All non-metallic exposed materials shall be sunlight and UV Will comply. resistant. 9 The design shall include the appropriate sizing of all cabling Will comply. (above and below ground) that will connect the PV modules, arrays, inverters, transformer and switchgear to the point of interconnection. Wire sizing and layout should result in no more than 1.0% drop in the AC voltage between the inverter and the point of interconnection. 10 All protection equipment throughout the system shall be sized Will comply. and specified to reduce damage on all components and the interconnection point in case of electrical failure. 11 The electrical systems, wiring, conduits, cables shall be neatly Will comply. routed to facilitate access, troubleshooting, maintenance, etc. 12 The electrical design shall include the design of equipment Will comply. grounding, and lightning / surge protection for the entire PV installation up to the point of connection. 13 Electrical engineering and design shall meet industry standards Will comply. such as the National Electric Code, UL-1741, IEEE 1547, and all other applicable local and state codes and standards.

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Item Requirement Compliance/Comment 14 National Grid will entertain the installation of 1,000 volt dc Not Applicable. No high voltage DC systems on ground mounted sites only. solutions proposed. Only exposed voltage is 120VAC which is safely managed per UL 1741. 15 All high voltage (1001V and above) underground conduit shall Not Applicable. be incased in concrete.

B-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 585 of 859

Appendix C – Design Package Compliance Table 4 lists the Design Package Requirements from Section 9.3 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 4. Design Package Compliance Item Requirement Compliance/Comment 1 Prior to starting construction, the selected/successful Bidder is Will comply. to provide the final design documentation for each location. 2 All interconnection costs, permits and associated fees are the Will comply. responsibility of the Bidder. 3 The final design package must include: Preparation of 3 - Line Will comply. Electrical Diagram (including wire sizing, conduit size, voltage drop calculation, and fuse ratings) 4 The final design package must include: Submittal of Will comply. Manufacturer Cut Sheets for ALL proposed components (e.g., mounting system, combiner boxes, pull boxes, conduit, sealants, etc.) 5 Design package should follow the proposed numbering found in Will comply. “Design Package Sheet Title List” (See Attachment 7).

C-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 586 of 859

Appendix D – Structural Analysis and Design Compliance Table 5 lists the Structural Analysis and Design Requirements from Section 9.4 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 5. Structural Analysis and Design Compliance Item Requirement Compliance/Comment 1 The Bidder shall provide a professional engineer’s stamped Will comply. report describing and confirming the proposed design meets the requirements of the applicable codes, standards and permits. 2 For roof-mounted systems, the Bidder shall provide a Not Applicable. Roof mount systems professional engineer’s stamped report describing and not proposed. confirming the structural integrity, remaining useful life and load bearing capacity of the roof and its ability to accommodate the photovoltaic modules and associated equipment.

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Appendix E – Interconnection Compliance Table 6 lists the Interconnection Requirements from Section 9.5 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 6. Interconnection Compliance Item Requirement Compliance/Comment 1 The Bidder will be responsible for the electric interconnection of Will comply. the solar system with National Grid. 2 For locations with an existing electrical service, all equipment Will comply. will be interconnected on the utility side of the point of common coupling (PCC). 3 Bidder will be responsible for all costs associated with Will comply. interconnection to the distribution system.

E-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 588 of 859

Appendix F - Construction Compliance Table 7 lists the Construction Requirements from Section 9.6 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 7. Construction Compliance Item Requirement Compliance/Comment 1 Upon acceptance of the final design by National Grid, the Bidder Will comply. shall submit a construction schedule for the project. 2 Bidder shall maintain up to date copies of all schedules, Will comply. Because the proposed drawings, specifications, permits and installation manuals at the deployment is distributed, materials construction site. shall be kept at the staging area. 3 Bidder shall be responsible for safe storage and security of all Will comply. uninstalled equipment. Bidder shall be responsible for obtaining and paying for any required off-site warehouse space, temporary parking, staging or laydown areas. 4 Bidder shall recognize and respect any properties adjacent to Will comply. the site and shall use reasonable efforts to minimize disruption to those neighbors (e.g., sediment control, dust control, traffic control, trash control, noise control, working hours etc.) 5 Bidder shall fully comply with all applicable notification, safety Will comply. and work rules when working on or near National Grid facilities. 6 Bidder shall route all field routed electrical collection systems Will comply. (e.g., string combiner boxes, cable trays, conduits, etc.) in a neat and orderly fashion and in accordance with all applicable code requirements. All cable/conductor terminations, excluding module-to-module and module-to-cable harness connections, shall be permanently labeled. 7 All equipment/cables/combiner boxes/tie wraps etc. exposed to Will comply. sunlight shall be UV rated to withstand exposure to sunlight for the 20 year duration of the project. 8 Bidder shall provide all temporary road and warning signs, Will comply. flagmen or equipment as necessary by law or practicality to safely execute the work. Street sweeping services shall also be similarly provided as necessary to keep any dirt, soil, mud, etc. off of roads. 9 Selected Bidders are to secure PV modules/panels to Not Applicable. Because PV units are racking/support system using theft-deterrent fixings to minimize bolted to utility poles at significant unauthorized removal of PV panels/modules. These fixings shall height and directly connected to require the use of special tools to enable removal of 120VAC secondary, theft is improbable modules/panels. and special tools are necessary for access. 10 It is the responsibility of Bidder to build all structural, electrical, Will comply. and mechanical aspects of the project as depicted in the final design. This includes the electrical system from the PV modules to the point of connection to the electrical distribution grid. The Bidder shall also provide all labor, temporary equipment, materials or facilities required to construct the project and place it into operation.

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Item Requirement Compliance/Comment 11 The Bidder shall ensure and verify that all hardware used on the Will comply. system is torqued to manufacturer specifications. 12 The Bidder shall supply all temporary office space, temporary Will comply. power, sanitation facilities, communications, and drinking water for their personnel on the Site. 13 Bidder shall keep the construction site clean and orderly Will comply. throughout the duration of construction. All trash shall be disposed of off-site by licensed waste disposal companies and in accordance with applicable law. 14 Photo documentation of all phases of construction shall be Will comply. Additionally, installation of collected by the successful Bidder and provide to the Company. the distributed utility pole-mount PV units includes photographing the installed unit for inclusion in the online database.

F-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 590 of 859

Appendix G – Manufacturer Qualification Compliance Table 8 lists the Manufacturer Qualifications from Section 9.7 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 8. Manufacturer Qualification Compliance Item Requirement Compliance/Comment 1 The company prefers equipment from PV module and inverter Will comply. Petra Systems has manufactures that have been in the manufacturing business for manufactured inverters for more than 5 at least 10 years, with at least five years manufacturing selected years and has been in business for 8 components of the size offered, for solar PV applications. years. 2 All Solar PV Array equipment shall be newly manufactured (not Will comply. refurbished or reconditioned) from a reputable manufacturer, experienced in providing equipment for the application and conditions.

G-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 591 of 859

Appendix H – Racking Compliance Table 9 lists the Racking Requirements from Section 9.8 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 9. Racking Compliance Item Requirement Compliance/Comment 1 All structural materials shall have adequate corrosion and Will comply. grounding protection for the soils (if ground mounted) and environment in which it is placed. 2 Racking components shall be anodized aluminum, hot-dipped Will comply. galvanized steel, or material of equivalent corrosion resistance throughout the twenty year project life taking into consideration the environmental conditions. 3 All structural and nonstructural components will be designed to Will comply. resist the effects of gravity, seismic, wind, weather and other applicable loads (including snow) in accordance with the requirements of the Massachusetts Building Code and wind uplift requirements per the ASCE Standard for Minimum Design Loads for Building and Other Structures. 4 All structural drawings associated with the project must be Will comply. stamped by a Professional Structural Engineer registered within the Commonwealth of Massachusetts. 5 The lowest edge of ground mounted solar modules shall be Not Applicable. Ground mount not elevated a minimum 3 feet above the ground level. proposed.

H-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 592 of 859

Appendix I – Inverter Compliance Table 10 lists the Inverter Requirements from Section 9.9 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 10. Inverter Compliance Item Requirement Compliance/Comment 1 Inverters shall be compliant with UL 1741 and IEEE 1547 Will comply. 2 Invertors shall have an audible noise: ≤62 dB (A) measured 3.3 ft Will comply. (1 meter) from the PV Inverter. 3 The inverter units should have built-in tolerance to variation in Will comply. Grid voltages. The inverter shall be capable of riding through voltage sags. Tolerance set points should be configurable to +/- 10% minimum. 4 The three phase output voltages and currents shall be sinusoidal Will comply. Single phase output only with low total harmonic distortion (THD) to meet IEEE 519-1992 for this type of installation. harmonic requirements. Inverter supplier to provide all harmonic filters as required. 5 Systems above 200 kW shall have a CEC weighted efficiency of Each pole mount-unit has a CEC 97.5 % or higher. efficiency of 93%.Units are less than 200 kW. 6 National Grid requires a minimum of two inverters per site for Each pole-mount unit has one inverter. sites larger than 100 kW. All units are less than 100 kW. 7 Include integral ac and dc disconnects. AC disconnects are included. DC interconnects are not applicable for the single-panel pole mount solution. The panel may be disconnected if necessary. 8 Provide galvanic isolation between dc and ac system Will comply. conductors. 9 The inverter ac nameplate shall not be less than the dc Proposed system has inverter AC nameplate (to aid in the benefit of advanced inverter nameplate less than PV DC nameplate. functionality). PV nameplate is at STC conditions. In real world conditions, maximum average annual energy harvest is obtained with PV DC nameplate larger than inverter AC nameplate. Additionally, Petra Systems inverter has been shown to have 27% excess capacity which may be leveraged for added production. 10 MPPT capabilities are required. Will comply. MPPT performance is maximized due to the 1:1 ratio of inverter to PV module. Refer to Appendix O.4. 11 The inverters must have a ground fault detection (GFDI) system Per NEC Article 690, pole-mount solar on the dc side to protect the system from a PV ground-fault. The AC modules do not require GFDI. inverter must be able to detect, notify (store and show fault codes), and interrupt photovoltaic ground-faults.

I-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 593 of 859

Item Requirement Compliance/Comment 12 Measured on the AC side: Instantaneous voltages on each phase Attachment to grid is single phase. individually (Van, Vbn, Vcn, Vab, Vbc, and Vca). Instantaneous voltage is measured on the phase to which the unit is connected. 13 Measured on the AC side: Instantaneous current readings on Attachment to grid is single phase. individual phases (Ia, Ib, and Ic) Instantaneous kW, kVA per Instantaneous current is measured on phase. the phase to which the unit is connected. 14 Measured on the AC side: Daily Cumulative kWh. Will comply. 15 Measured on the AC side: Total kW and kVA. Will comply. 16 Measured on the DC side of inverter: Instantaneous dc currents Will comply. Measurement is per pole- on each home run into the inverter. mount unit. 17 Measured on the DC side of inverter: Instantaneous dc voltage. Will comply. Measurement is per pole- mount unit. 18 Revenue grade energy meter. Will comply. Meter supports ANSI C12.1/C12.20 certified at1% accuracy 19 Inverter temperature within the inverter cabinet. Will comply. 20 Status of cooling system (fans) Not Applicable. Pole-mount units are shaded by the PV module and ambient air cooled via heat sink. 21 Error / diagnostic codes. Will comply. 22 Status of inverter (on /off). Will comply. Status is indicated via IntelliView. On-site output may be determined via clamp-on ammeter. 23 Time log of inverter operation start/finish periods each day – 28 Will comply. day data storage to be held by inverter. 24 Firmware updates and their installation/commissioning over the Will comply. warranty period shall be included in the contract price. 25 Factory Testing Certification or a report of all factory tests Will comply. conducted shall be provided. 26 Communication protocols and remote monitoring of the Will comply. inverter shall be available via RS485 SunSpec over ModBus. 27 The Inverters provided must carry a UL 1741 or equivalent Will comply. certification. However, National Grid understands that enabling advanced inverter features described here may nullify this certification during operation. 28 Active/Reactive Power Control (Voltage and frequency Will comply. regulation). 29 Power Factor Control. Will comply. 30 Ramp Rate Control. Will comply. 31 Under/Over voltage and frequency ride through. Will comply. 32 The inverter must be capable of remote start/stop according to Will comply. the IEEE 1547a amendments.

I-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 594 of 859

Item Requirement Compliance/Comment 33 Inverters shall be capable of DNP3 and/or IEC 61850 over Will comply. The inverter is capable of MODBUS. communicating through DNP3, IEC 61850m and Modbus through the portal. This will act as a centralized interface for all inverters. 34 The above listed advanced functions shall be made available to Will comply. National Grid over a secure remote connection.

I-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 595 of 859

Appendix J – Solar Modules Compliance Table 11Table lists the Solar Modules Requirements from Section 9.10 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 11. Solar Modules Compliance Item Requirement Compliance/Comment 1 PV modules must be Crystalline Silicon (Mono-Crystalline Silicon Will comply. or Multi-Crystalline Silicon). 2 The Bidder is to ensure that the equipment and its functionality Will comply. are suitable for meeting the overall requirements of the project. For the panel manufacture include information showing at least 5 years in photovoltaic panel manufacturing business, and still in business through bidding process. 3 The modules provided will be type tested and comply to the Will comply. following standards: UL 1703 (The Standard for Safety for Flat- Plate Photovoltaic Modules and Panels set by UL). 4 The modules provided will be type tested and comply to the Will comply. following standards: ISO9001 – (Quality Management Systems). 5 The modules provided will be type tested and comply to the Will comply. following standards: IEC 61215 and 61730 (Quality test for crystalline silicon modules; safety test). 6 The nameplate ratings of the systems shall not fall below the Will comply. ratings agreed at final design. 7 Each PV module shall have its serial number recorded, and shall Will comply. be flash tested under factory conditions to determine its IV characteristic which shall also be recorded against the serial number. National Grid shall be provided with the information in MS-Excel format. 8 Power loss due to module power mismatch is to be less than Will comply. Pole-mount units operate 2%. The Bidder is to provide National Grid with a strategy for with one module per inverter. No achieving this. The modules shall be selected to eliminate strings are used. Refer to Appendix O. output reduction by voltage mismatch within a string. 9 Please provide specifications showing typical electrical Will comply. characteristics for NOTC and STC (including I-V curve voltage and current for the maximum power point, maximum power current and maximum power voltage). 10 Provide PV module snow weight resistance – provide the Will comply. maximum weight that the solar panels/frames/fixings can withstand before breaking or bending. 11 Provide PV module wind resistance – provide the maximum Will comply. wind speed that the panels/frames/fixings can withstand before breakage. Wind impacting on the upper and lower surfaces should be considered.

J-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 596 of 859

Appendix K – Weather Monitoring Station and DAS Compliance Table 12 lists the Weather Monitoring Station and Data Acquisition System Requirements from Section 9.11 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 12. Weather Monitoring Station and Data Acquisition System Compliance Item Requirement Compliance/Comment 1 A data acquisition system shall be provided by the Bidder Not Applicable. The proposed solution suitable for collecting and monitoring (locally and remotely) the comprises distributed utility pole- performance data of the solar installation, PV panels, inverters mount single panel PV units. The and the irradiance, temperature and wind speed at the facility. performance data for each PV panel and inverter, and the temperature on the inverter, will be reported from the pole-mount solar solution. The nature of the widely distributed system greatly diminishes the relevancy of the weather station data for each pole. However, PLC will supply a centrally located weather station for each town if required. 2 All data acquired by the Data Acquisition System and any Will comply. reports/publications etc. using this data shall be and remain the property of National Grid, and will be provided to National Grid at no additional cost. 3 Any monthly fee associated with leasing a communication Will comply. carrier/line and provided by a public utility such as Verizon or Comcast shall be paid by National Grid after final acceptance. Bidder is responsible for coordinating with the communication carrier to install/commission the line and any associated costs/fees to install the line. 4 The following items shall be averaged every 10 minutes, and the Items 1-4 are not applicable. Item 5, average, maximum and minimum values are stored and sent to inverter data, will comply. the DAS via a hard wired connection. The instantaneous values shall also be stored and sent to the DAS. 1) Ambient temperature 2) Module temperature 3) Solar irradiance in the horizontal plane 4) Solar irradiance in the plane of the module 5) All inverter data 5 Communication Signals and Specifications (Outgoing). Will comply, apart from weather From DAS to SmartGrid: monitoring, and pending final In the future, the performance of the solar generation plant will specification and timeline. The Petra be communicated to a SmartGrid facility – it is believed that this Systems inverter is capable of will be ModBUS. For monitoring purposes, all signals will be sent communicating through DNP3, IEC to National Grid offices. All transducers/sensors and any 61850m and Modbus calculated values listed above will be remotely monitored. Any control (e.g. start/stop) will be routed via the National Grid SmartGrid facility when it becomes available.

K-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 597 of 859

Item Requirement Compliance/Comment 6 Instantaneous data (including weather station data) received by Will comply in capability. Data is the DAS for transmission to National Grid/O&M provider shall aggregated at the SunWave be made available without delay. In the event of a Communicator and is uploaded to the communications failure between the DAS and either of these datacenter only periodically to two recipients, the data shall be stored for a minimum of 30 minimize communications expense. days in the DAS. When communication resumes, this data shall be sent to the recipients again. In the event that storage is exhausted before communication resumes, new data shall overwrite the oldest data on a daily basis.

K-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 598 of 859

Appendix L – Spare Equipment Compliance Table 13 lists the Spare Equipment Requirements from Section 9.12 of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 13. Spare Equipment Compliance Item Requirement Compliance/Comment 1 The contractor shall provide five (5) spare solar modules for PLC acknowledges need for spares. Will each site, including delivery, unloading and movement to a comply with an equal or better place of storage (which may not be at the solar generation site). alternative to be negotiated due to the integral nature of the pole-mount solution.

L-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 599 of 859

Appendix M – Advanced Solar PV Array Compliance Table 14 lists the Requirements from Attachment 8, National Grid Advanced Solar PV Array Technical Requirements, of the Solar Phase II Initiative RFP. Each requirement is addressed with expected level of compliance and additional information as relevant, including added value beyond the requirement which may be provided.

Table 14. Advanced Solar PV Compliance Item Requirement Compliance/Comment 1 Conformance to these requirements will require the PVF to Will comply. automatically respond to changes (grid instabilities/faults) at the Point of Common Coupling (PCC) and/or to respond to Grid Operator requested changes to the operational state of the PVF features (PVF = Photovoltaic Facilities) 2 The Inverters provided must carry a UL 1741 certification from a Will comply. qualified testing agency such as UL, ETL CSA, or other NRTL. 3 The PVF should be designed to operate within a power factor Will comply. range from 0.80 lagging to 0.80 leading at the Point of Common Coupling (PCC). To meet this required power factor range, the PVF may reduce the facility KW generation to maintain its KVA rating. 4 The PVF should be capable of 60% KVAR of the nameplate KVA Will comply. to be injected at the PCC during operation. To meet this KVAR requirement the PVF may reduce the facility KW generation to maintain its KVA rating. 5 The PVF should be capable of steady state operation, with no Will comply. derating, between 57.0 and 61.5 Hz. 6 The PVF must be able to ride through frequency events as long Will comply. as 1 second at +/- 10hz and 100 seconds at +/- 5Hz. 7 The PVF has a ride through profile compliant with Attachment 8, Will comply. Table 2-1. 8 The PVF should be capable of steady state operation, between Will comply. +/- 10% nominal PCC voltage. 9 The PVF must be able to ride through the Voltage disturbance Will comply. profile given in Attachment 8, Table 2-2, by design. The actual set points for voltage faults will be modified by the utility (according to appropriate registers that follow below) for operation, but the hardware must be capable of these more stringent requirements. This voltage is both for symmetric and asymmetric single phase faults down to 0.0 Volts (measured at the Point of Common Coupling) for up to 150 ms. Note that there are different operating characteristics for Type 3 (symmetric) and Type 1 - 2 (asymmetric) faults. 10 National Grid requires that the PVF will have provisions for both Access can be made locally via secure local and remote interfaces for modification of the operating Internet connection on a mobile device data. to the access point. As utility-pole mounted AC module solar units, no interface exists on the inverter.

M-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 600 of 859

Item Requirement Compliance/Comment 11 National Grid requires both autonomous/dynamic control Will comply. (predefined behaviors established by the regulatory or utility requirements) and interactive/immediate control (specific actions selected by the user/operator) capabilities for managing inverters. 12 Security: The PVF should include provisions to maintain Will comply. authority for making system changes. This should include validation checking of authorized users, control hierarchy, user authority to switch modes, etc. 13 The site must keep at least 1 month of 1 minute data resolution Will comply. of all critical operating parameters. This includes, but is not limited to AC (KW, KVAR, KVA, PF, V, A), DC (V, A), Inverter Temps, etc. 14 Access to the local interface port shall be password protected at All access is password protected to the a minimum. local access point. See item 10. 15 The remote interface must also allow National Grid to download Will comply. 1 minute data resolution for the operating life of the PVF. 16 Describe which communication protocols are available for each Will comply. Wireless Internet interface port including the logical (e.g. Serial, Ethernet, etc.) and physical to the ZigBee network. (e.g. DB-9, RJ-45, optical, etc.) interfaces that are supported capabilities. 17 Cyber security capabilities including password protection (if Will Comply. Refer to Appendix P. proposed) will need to be described in the proposals. Describe all layers of security measures proposed. 18 Describe the Human-Machine Interface (HMI) used to make The HMI is a secure web-based configuration changes (browser based, client application, or graphical user interface (GUI) accessible other). In the response describe how the configurable via browser. See details on IntelliView parameters will be changed; via a downloadable file, use of a in Section 4.2.2.8. command line, or other means. 19 The PVF should alert National Grid of any failures. Will Comply. IntelliView generates alerts based on selected thresholds. 20 The PVF should be able to detect if it has not received Will comply. communications from the National Grid control system. If no communications has been identified for 10 minutes, the PVF should default to operate in KW production mode only, with no frequency or voltage dependent control modes enabled and no power curtailment enforced. The system should also default to the standard IEEE 1547 defined trip points. Once communications is re-established, it should stay in the defaulted mode until commanded otherwise, and alert National Grid that communications has been restored. 21 Ramp Rate Limits per section 4.1. Will comply. 22 Real Power Curtailment per section 4.2. Will comply. 23 Reactive Power Modes per section 4.3. Will comply. 24 Power Factor Control Mode per section 4.3.1. Will comply. 25 Reactive Power Control Mode per section 4.3.2. Will comply. 26 Power Factor Compensation Mode per section 4.3.3. Will comply. 27 Voltage Compensation Mode per section 4.3.4. Will comply.

M-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 601 of 859

Item Requirement Compliance/Comment 28 Voltage Regulation Mode per section 4.3.5. Will comply. 29 Frequency Droop Response per section 4.4. Will comply. 30 Frequency Fault Control per section 4.5. Will comply. 31 Low Voltage Ride Through (LVRT) & Over Voltage Ride Through Will comply. (OVRT) per section 4.6.

M-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 602 of 859

Appendix N – Preliminary Design Package Table 15 notes any design package materials called out in Attachment 7 that are provided with this proposal (uploaded as a separate file to the National Grid ARIBA system). The status column also notes which design package elements are not applicable to a pole-mount solar project. Design package contents included with the proposal are to be considered “Advance” and for reference only. Applicable information not provided with the proposal, and any updates shall be provided when the final design package is due.

Table 15. Preliminary Design Package Contents Figure Title Provided Status G-1 General Notes & Symbols Will Provide C-1 Existing Site Conditions Will Provide C-2 Overall Site Plan Will Provide C-3 Storm Water & Erosion Control Not Applicable C-4 Clearing, Grubbing, & Trimming Plan Will Provide C-5 Shadow Plan Will Provide C-6 Fencing Plan Not Applicable C-7 Foundation Plan Not Applicable C-8 Details Will Provide M-1 Racking Site Plan Not Applicable M-2 Component Layout Not Applicable M-3 Component Plan Details Not Applicable M-4 Component Elevation Details Not Applicable M-5 Assembly Details Will Provide E-1 Overall Single-Line Will Provide E-2 Inverter Data Acquisition & Smartgrid Control Will Provide Communications Single-Line E-3 Protection Logic Diagram Will Provide E-4 Power Three-Line Will Provide E-5 Communications Three-line Will Provide E-6 Electrical Equipment Plan Will Provide E-7 String Plan Not Applicable E-8 Conduit Plan Not Applicable E-9 General Details Will Provide E-10 Grounding & Bonding Details Will Provide E-11 Electrical Service Details Will Provide E-12 Electrical Notes & Plaques Will Provide S-1 PV Modules X Will Provide S-2 Combiner / Re-Combiner Boxes Will Provide

N-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 603 of 859

Figure Title Provided Status S-3 Disconnects Will Provide S-4 Inverters X Will Provide S-5 Data Acquisition & Control Equipment X Will Provide S-6 Communication Equipment X Will Provide S-7 Switchboards / Mini-Power Centers Not Applicable S-8 Step-up Transformers Not Applicable S-9 Service Entrance Equipment Not Applicable S-10 Interconnection Equipment Not Applicable

N-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 604 of 859

Appendix O – Technology Differentiation This section discusses the technology and many benefits of a Petra Systems SunWave pole-mount AC module solar solution versus a traditional rooftop or ground mount solar array. Also described are other inherent advantages such as no scheduled maintenance, benefits of a distributed deployment, and advanced inverter benefits.

O.1 Solar Solution Differentiation Summary Table 16 shows a summary comparison of the key features and benefits of the Petra Systems SunWave AC module solutions versus traditional DC string arrays. Petra Systems SunWave AC Modules are the safest, highest performing option for distributed deployments and small to medium (e.g. < 10 MW) arrays, and are the only solution type offering immediate energy generation, simplified alignment and repurposable deployment. It is for these very reasons that Petra Systems champions utility-grade AC solar modules and is the industry leader in utility-owned solar AC module deployments.

Table 16. Petra Systems SunWave AC Module – DC String Array Comparison Feature Petra Systems SunWave™ Traditional DC String Array AC Module Safety Inherently Safe Multiple Hazards High Voltage DC Not applicable, no high voltage DC Yes, up to 900V DC Automatic Shut-off Yes, per panel Yes at grid, but panels may remain energized Deployment Highly Fast and Flexible Requires extensive planning and long build-out cycle Adaptability Scalable, upgradable, Site specific design repurposable Lead Time Immediate and ad hoc Permits, site work, system design Performance Maximum per-panel performance Entire string subject to in all conditions performance of worst panel Reliability Potential failure limited to A single component failure may individual module bring down all or part of system Diagnostics Monitoring, reporting and control Not at panel level, any solution at individual panels must be specifically designed

O.2 Traditional DC String Array Solar Systems The traditional DC string array architecture combines solar panels in a DC series configuration, much like batteries are “stacked” in a common flashlight. The series configuration creates an aggregate DC voltage from all of the connected panels, often 600 – 900V DC, which is then fed to an inverter which in turn generates an AC voltage from the entire “string” of solar panels. A diagram of a traditional DC string solar array is shown in Figure 13.

O-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 605 of 859

Successful string inverter installations require careful system design. Miscalculation of worst case maximum open-circuit voltage of a solar PV panel string is a common cause of inverter failure. Additionally, panels within a string need to be very closely matched, requiring the same manufacturer, age, condition, and panel orientation to avoid a significant reduction in the power output of the whole string. Similarly, special attention is needed to ensure that a string does not become partially shaded, for example, by a building, a tree, or nearby objects, or the entire array will suffer from reduced output.

One more significant consideration of this type of solution is that, because traditional DC string array solar solutions are inherently arrays of multiple panels, it is extremely likely that deployment site planning is required, which may include the requirement for obtaining permits and development of grid connection resources, and very limited redeployment capability for the resources.

Figure 13. Traditional DC String Array Solar Architecture

O.3 Petra Systems Modular AC Grid-tie Solar Solutions The Petra Systems SunWave modular AC grid-tie solar solutions are a recent advancement based in the innovation and economy of high-performance panel-level inverters (which are part of the Petra Systems Smart Energy Module). The basic module of a solution comprises a single solar panel with an integral panel-level inverter, producing an AC output directly at the panel. Additional electronics may be included in the module to perform other functions, such as smart grid diagnostics and control. AC module outputs are then connected to the utility grid in parallel, as shown in Figure 14. Because no series or parallel DC connections are made outside of the panel module, all DC wiring remains at the relatively low voltage level of a single panel (typically less than 50V DC).

Since AC solar modules are connected in parallel and do not need specialized electrical design, they can be deployed one at a time providing a pay-as-you-go option. As few as one module may be installed at a time, and the array later expanded or repurposed to another site, without large redesign or cost penalties. This modularity also enables installation of an array of modules without needing to align them all at the same elevation angle or azimuth. The result is the ability to fully populate all potential areas with solar generation without the cost of adding a central inverter for each configuration.

O-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 606 of 859

Figure 14. Modular AC Grid-tie Solar Architecture

O.4 Solar Solution Performance Solar panels are rated for nominal power, power tolerance, efficiency, and test conditions, and vary from the manufacturing process and from manufacturer to manufacturer, resulting in inherent differences in performance. The performance of a panel is also dependent on its operating conditions. The largest impact to panel performance occurs when shading irregularities are present at the installation site, such as trees, orthogonal roof peaks, or general dust and debris. In addition, mismatched panel specifications and non-uniform changes in temperature and irradiation also affect panel performance.

A process known as maximum power point tracking (MPPT) is generally implemented in solar deployments to maximize panel efficiency for existing conditions. MPPT presents an optimal electrical load to a solar array or panel and produces a voltage suitable for the load. This is necessary because solar PV panels have only a single current-voltage operating point that results in maximum power output corresponding to any given load. Maximum power point trackers use control systems to search for this maximization point to enable the system to produce the maximum power available from a panel or array.

Traditional DC string array solutions perform a single MPPT process for the entire array. However, each panel has a different maximum power point due to manufacturing tolerance, partial shading, etc. Therefore, in traditional DC string array solutions, some panels will inherently be performing below their maximum potential power generation, resulting in reduced overall performance. Performance is reduced because the same current flows though all panels in the string, which is limited to the lowest panel current.

In Petra Systems SunWave modular AC grid-tie solutions, MPPT is performed for each solar panel individually, thereby maximizing energy harvest for individual panels and the solution as a whole. The AC solar module architecture decouples each solar panel from other panels in an array, enabling them to operate at their maximum power-producing capacity regardless of the condition or performance of other modules. This also simplifies sourcing of solar PV panels by enabling multiple suppliers and panel specifications to be designed into a system.

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An analogy may be employed to illustrate these solution characteristics, as shown in Figure 15. The upper half of Figure 15 shows a collection of Petra Systems SunWave modular AC grid-tie panels connected to the utility grid (connected in parallel). Each panel module has individual MPPT and output control and provides optimum output, even if one panel output is weak, perhaps due to shading. This is analogous to each modular AC grid-tie panel being represented as a battery in its own flashlight. All three flashlights are focused on the same spot, each adding to the light at its maximum capacity, despite a weak output in the middle flashlight, as shown at the upper right of the figure.

Figure 15. AC Module vs. DC String Array Performance The bottom half of Figure 15 shows a similar analogy for the traditional DC string array in which the panels are connected one to the other (connected in series) and the “end” output is connected to the utility grid through a large central inverter. An underperforming panel, perhaps due to shading, limits the flow of power as demonstrated by the three batteries in a single large flashlight (bottom right of the figure). Here the weak (middle yellow) battery limits the overall light output of the flashlight which is less than the sum of the three flashlights from the modular AC representation.

Independent tests have shown that individual panel MPPT can increase the energy harvest of a typical solar array by 18% as compared with traditional series-wired solar panels with a centralized inverter (Oldenkemp, 2004). It is very clear from the study that in shaded solar PV systems, modular AC solutions connected in parallel always have a higher energy yield than DC string arrays in series. Furthermore, the study shows that under all shading conditions, the shape of the power-voltage curve of a solar PV AC module system "is always the same, and shows a clear maximum, at an almost constant voltage". For the DC string array solution, the maximum power point “of the string fluctuates strongly, even under

O-4 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 608 of 859 very light shading conditions.” The nearly constant maximum power point of the modular AC solution makes the MPPT system simple and more efficient. For example, simplicity in the implementation of the MPPT algorithm will enable the inverter specification to have narrower DC input voltage, supporting more efficient tracking of the maximum power point.

O.5 Solar Solution Deployment Closely related to configuration options are solar solution deployment issues and options. Deployment considerations can be divided into timing, installation requirements, positioning, and adaptability. In all of these areas, Petra Systems SunWave AC modules excel beyond the limitations of traditional DC string arrays.

O.5.1 Deployment Timing Timing of a solar deployment is critical in terms of producing a short time to cash flow/return by reducing the time to installation and operation. Petra Systems SunWave modular AC grid-tie solutions have a distinct advantage over traditional DC string arrays in this capacity – they do not require extensive site studies and they may be deployed in a piecemeal fashion as budget and installation capability allow. Because DC string arrays require a complete system design and “all or nothing” deployment and operational launch, they tend to have considerably longer planning and development cycles leading to longer time to cash flow and power generation.

O.5.2 Installation Requirements The level of training and certification, as well as equipment needs and standards compliance, are of key importance in solar deployments. In addition to the site studies and permits required for most traditional DC string array deployments, special training or certification may be required of the installation crew to handle the high voltage DC inherent in the systems. Finding and retaining such specialized labor, particularly if deployment is expected to occur over a significant period of time, may be economically prohibitive. Petra Systems SunWave modular AC grid-tie solutions generally have low DC voltages and present output voltages of 120V or 240V AC, which do not require specialized training and can be handled by non-specialized electricians and utility linemen. The ability to use the same electricians or utility linemen who regularly service and install electrical assets for the installation of solar resources is particularly beneficial.

O.5.3 Positioning Positioning considerations in relation to deployment include the location of the asset on which solar resources are to be deployed, the cardinal direction in which the solar panels should, or must, face (azimuth), and the elevation angle requirements for performance at given latitude. When using existing assets, little or no adjustment may be possible for optimizing positioning. For example, rooftops may have usable but suboptimal slopes, or may not face precisely south. Similarly, transportation assets such as noise barriers and overhead sign structures will not likely provide a perfect southern exposure.

A modular solar architecture lends itself to deployment in such variable positions. Petra Systems SunWave modular AC panels may be placed singly or in arrays on an asset, facing in sub-optimal, or even different, directions and elevations, yet providing maximum output possible for the given conditions. A

O-5 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 609 of 859 traditional DC string array cannot be deployed in many such cases because of the inability to closely match panel alignment or the inability to design solutions in a cost-effective manner for the multitude of possible variations.

Another consideration in positioning is the choice to position for maximum power or for load offset. Maximum power positioning will target an optimal southern exposure and an optimal elevation angle for the site latitude. Positioning for load offset will direct the panel for peak exposure, corresponding to a given time of heavy energy use. For example, load offset for late afternoon peak loads would be faced southwest rather than directly south, to maximize energy production during late afternoon. Petra Systems SunWave modular AC grid-tie solutions, which produce best case power for their given mounting, are easily used for either positioning criterion.

O.6 Safety Safety is a paramount consideration in any solar power deployment. Understanding and reducing or eliminating risk to people and property, and liability for all partners, must be a requirement for any solar deployment.

Petra Systems SunWave modular AC solar solutions clearly enable the safest solar PV systems since the output voltage is equivalent to typical residence or building voltage and the need for wiring and interconnection are limited. In contrast, a DC string in traditional solar systems typically outputs greater than 600V DC under load and remains energized as long as exposed to the sun, creating daytime safety concerns for workers, and especially for first responders in the event of an emergency.

Additionally, all Petra Systems SunWave modular AC solar solutions have built-in intelligence, communication, and emergency disconnect functions at each solar module which provide an even safer environment. Per the UL 1741 and IEEE 1547 standards, once the main power switch is turned off at the building or grid breaker, every AC solar module rapidly disconnects. Similarly, if the grid otherwise becomes de-energized, perhaps as a result of an accident, component failure, or lightning strike, every Petra Systems AC module rapidly disconnects. The Petra Systems AC outputs are automatically de- energized and individual modules can be safely removed.

O.7 Reliability – No Single Point of Failure The reliability of solar solutions is also based in the solution type. While individual solar panels can survive failure of parts of the panel, a complete panel outage, due, for example, to vandalism, can cause a traditional DC string array to suffer complete system failure in some cases. Consider the flashlight analogies given in Figure 15. Rather than assuming that a panel or related component is simply operating inefficiently, assume the shaded panel or component to be physically damaged. For the Petra Systems SunWave modular AC grid-tie solution, if the panel represented as the weak battery becomes completely impaired, the solution output is diminished only by loss of that malfunctioning panel, which would be represented by a dead middle flashlight. All other panels continue to provide output. In the traditional DC string array case, the panel represented as the weak battery in the three battery flashlight, goes dead. Like having a dead battery in the flashlight stops all light output, the inoperative solar panel provides no individual output and causes the entire array to fail. This single point of failure

O-6 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 610 of 859 characteristic of traditional DC string arrays is a significant drawback where solar deployment could be affected by an accident, act of nature, or vandalism, ending in loss of the entire system. For the Petra Systems SunWave modular AC grid-tie solution, there is system survivability in such a scenario.

O.8 Monitoring & Diagnostics Just as AMI meters provide electric measurement capabilities at customer endpoints, each Petra Systems SEM offers such capability at every location that solar AC modules are tied to the grid. Not just kWh meters, but also voltage and frequency sensing are deployed. When deployed in an intelligent multi-point network, these distributed capabilities then support diagnosis and restoration of power outages, brownouts and other distribution issues.

O.9 No Standard Maintenance Maintenance needs for static solar installations where there is regular rainfall are minimal to none. Cleaning of panels is unnecessary in almost all conditions as rainfall is sufficient in most areas to keep panels clean of dust and debris such as bird droppings. Such intermittent dirt on the panels does little to affect output, especially in the case of Petra Systems SunWave modular AC grid-tie solutions which do not suffer from reduced output when a single panel is impaired. In areas receiving little rainfall, dust accumulation may necessitate periodic cleaning of solar panels.

A good understanding of dust-related effect on solar PV deployments can be gained from a report that details the findings from a study that was performed in the California desert (Kimber, 2006). In this study it was observed that the efficiency of the solar panels fell by only a few percent during a five month period of no rain. After a rain, even small amounts, the efficiency improved, largely back to normal as shown in Figure 16.

O-7 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 611 of 859

Figure 16. Solar Panel Efficiency in the Presence of Dust and Rainfall During the dry season the performance of the solar panels decreased at a linear rate as shown in Figure 17.

Figure 17. Linear Regression Fit to Panel Output Reduction The authors derived an equation to predict this decrease in performance. However, the voltage reporting capability of the Petra Systems SunWave AC Module makes this largely unnecessary as underperforming panels can be set to generate alerts for underperformance.

O-8 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 612 of 859

O.10 Shovel-ready for Immediate Installation SunWave systems are compatible with existing grid infrastructure and Petra Systems’ unique intelligent communications system is compliant with emerging smart grid technology. These systems can be remotely upgraded to leverage future applications and standards as they emerge. SunWave solutions are also shovel-ready to bring solar on-line faster, enabling utility partners to deploy meaningful energy generation while leveraging existing assets and time tested deployment strategies.

O.11 Immediate, Distributed and Incrementally Deployable SunWave systems are ready for immediate installation and can be shipped upon commencement of a program. The systems are incrementally deployed and instantly commissioned, realizing a return on investment almost immediately.

The SunWave units are therefore “shovel-ready” for immediate installation, leveraging existing infrastructure with a predictable installation time of less than 30 minutes. These units are also incrementally deployed; Utilities control rollout schedule by ordering and installing SunWave units as required.

The systems are instantly commissioned, providing clean power, communications and Smart Grid capabilities which all generate a return on the utility’s investment almost immediately.

O.12 Peak Shaving and Peak Shifting Solar PV power generation offers the benefit of peak shaving to the system owner and utility. Peak energy usage on the grid is usually during daytime hours (sometimes with a second evening peak). When solar solutions are added to the grid, they allow for “shaving” of some of the cost of that peak load, benefiting the system owner and easing the grid load in support of the electric utility. Additionally, most solar power solutions are non-mechanical, lending to their reliability, and they support distributed power generation – during daytime peak loads – benefiting the utility grid.

In addition to peak shaving, Petra Systems’ pole-mount solution allows for managed peak shifting during deployment. By adjusting the azimuth more westerly the solar power peak is adjusted to later in the day. Therefore, by adjusting all pole-mount solar units west of south, a later peak may be generated. Similarly, by allowing an azimuth range, perhaps from 160 to 200 degrees of azimuth, the solar peak is flattened and distributed across a broader time period with very little effect on overall production.

O.13 Increased Energy Harvesting One of the main benefits of the SunWave Solar AC Module is the increased energy harvesting capability compared to string type systems. This is due to the fact that a single MPPT per panel is implemented which maximizes the power output of every panel in a PV system individually and therefore the system as a whole. With string inverters, partial shading of some panels will result in reduced power generation capacity since the system MPPT will not detect changes of a single panel.

To quantify the benefits of a parallel connected PV system (AC PV approach) versus a series connected PV system (string inverter approach), tests were conducted by OKE-Services of the Netherlands to

O-9 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 613 of 859 capture the improved power harvesting capability of AC PV Modules versus string inverters under various shading conditions, namely very light to medium shading (Oldenkemp, 2004). Figure 18 shows the performance of an AC PV Module versus a string inverter under very light shading conditions (e.g. a pole or tree shadow partially covering one PV cell).

Figure 18. Results under very lightly shading conditions:

∆P AC PV/string = 4.9% at light load & ∆P AC PV/string is 9.6% at V=81.5% of Voc

The increase in power harvesting capability was measured to be 4.9% at light load and increases to 9.6% at when loaded at 81.5% Voc. For a light shading condition (e.g. a pole shadow partially covering few PV cells), the increase in energy harvest is further increased to 10.6% at light load to 27% when loaded at

81.5% Voc (Figure 19).

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Figure 19. Results under lightly shading conditions:

∆P AC PV/string = 10.6% at light load & ∆P AC PV/string is 27% at V=81.5% of Voc

As the level of shading is increased further and becomes more moderate where the shadow covers part of one or more PV modules, the increase in energy harvest increases even further from 12.2% at light load to 216% when loaded at 81.5% Voc (Figure 20).

Figure 20. Results under medium shading conditions:

∆P AC PV/string = 12.2% at light load & ∆P AC PV/string is 216% at V=81.5% of Voc

It is clear that even slightly shaded PV systems in which PV modules are connected in parallel, such as the SunWave Solar AC modules, the energy yield is considerably higher than PV modules connected in a

O-11 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 615 of 859 string (in series). The increase of energy yield depends on the situation, as the presented in Figure 18 through Figure 20.

Table 17 summarizes the energy yield under the various conditions.

Table 17. Energy Harvesting Improvements with Parallel PV Systems

Shading conditions Very lightly Lightly shaded Moderately shaded shaded Parallel system power gain, 2 – 5 10 – 20 0 – 50 minimum [%] Parallel system power gain, 10 - 20 20 – 40 30 – 400 nominal loading [%]

From the above data, and using of the results of the very lightly shaded conditions, the average gain of parallel PV system consisting of AC PV modules is at least 10%. This translates into effective efficiency improvement compared with string systems.

Using the PVWATTS model (http://pvwatts.nrel.gov/) to calculate electrical energy produced by a grid- connected photovoltaic system, which multiplies the nameplate DC power rating by an overall DC to AC derating factor to determine the AC power rating of a PV system, the derating factor for a typical string inverter with 95% efficient inverter is 0.802. If AC PV modules are used in lieu of string inverters, and to reflect the energy harvest gain of AC PV modules, the soiling factor is adjusted from 0.95 to 0.99 (the maximum limit). This reflects a 4% improvement over string systems, which is a very conservative gain given the above results. Now accounting for the fact AC modules have no DC wiring and as such no associated losses, the DC wiring factor needs to be adjusted to 1.00. Since the calculator limits the DC wiring value to 0.99, the PV module nameplate DC rating factor was raised by 0.01 to realize an effective DC wiring derating of 1.00. The PVWatts resultant derating factor for the SunWave Solar AC PV module is 0.844, which reflects a 5% gain even over a higher efficiency string inverter. This will further improve the ROI of the PV system and reduce the time to breakeven.

O.14 Reduced Transmission Line Losses To help show the benefits of distributed reactive power supply, a simple system is presented, as shown in Figure 21. The simple system shown below consists of a generation bus, a load bus, and a line connecting the two buses. Assuming that the load power factor is 0.90, the real power (P) consumed by the load is 1 MW, the resulting reactive power (Q) will be 0.484 MVARs.

O-12 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 616 of 859

Generation Load Center R+jX G

Qc P+jQ

Figure 21. A simple one-line power system.

To show the impact of localized reactive power generation, it is assumed that a compensation device at the load side will inject a Qc = 0.156 MVAR to increase the load power factor 0.95. The resultant real and reactive power supplied by the generator are P = 1 MW and Q = 0.329 MVAR.

Injection of reactive power at the load side may raise the voltage and reduce the line current. Since the real power loss is I2R, the line losses will be lower if the current is reduced assuming that the load-side voltage remains the same. Without compensation, the line loss is given by

The line loss with reactive power compensation of 0.156 MVARs is given by

As a result, the reduction in line losses will be

If the total system loss is 3%, the savings in losses will be:

1 MW x 3% x 10.3% = 0.00309 MW = 3.09 kW

This can generate considerable savings if it is stretched for a long time period such as a net 4 months of peak loads when compensation is needed and scaled to a per MVAR base. Assuming an average utility cost for 1 MWh energy is $112/MWh during peak hours, the total savings will be

112 x 0.00309 x 120 x 24 = $997/year

Note that the above savings are generated from 0.156 MVAR of compensation. Therefore, the savings for every MVAR of reactive power compensation will be $6390/MVAR-year. Note that the actual savings should be slightly higher since the terminal voltage V should be slightly higher due to the reactive power compensation.

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O.15 Increased Line Capacity The injection of reactive power leads to reduced line current flow and increased transmission line capacity. In the previous example, the injection of reactive power to increase the load power factor to 0.95 will also lead to reduced line current. This is equivalent to having a distribution or transmission line with higher kVA capacity rating.

For the previous one line system, the line current without compensation is given by,

The line current with reactive power compensation is given by,

As a result, the reduction in line current is given by,

The capacity of the transmission line is therefore increased by 5.2% allowing for additional dispatch of inexpensive power to the load side as compared to adding expensive load side generation. As such, an additional 0.052 MW can be transferred over from generation center to load side for every 1 MW load.

O.16 Increased Maximum Transfer Capability The maximum transfer capability of the sample system is given as

Again, assuming reactive power compensation of 0.156MVARs, the max transfer capacity will be improved by 15.5%. Therefore, during the 4 months of peak load, the system may move 15.5% more inexpensive MW from generation center to load center while keeping roughly the same voltage stability margin. Again, this can be converted to a dollar savings amount as

$112 x 0.155 x 120 days x 24 hours = $49,997/year

If the compensation is scaled to $/MVAR, it is as significant as $320,492/MVAR-year.

O-14 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 618 of 859

As stated in the previous sub-section, the entity that benefits is the utility and/or transmission company since they are the network owners.

It should be noted that many other benefits can be realized that may be difficult to quantify such as improved voltage regulation and voltage quality as well as more reliable transmission network with reduced current flows.

O.17 Full VAR Control Technology One of the unique features of the SunWave Solar AC Module is the integrated reactive power generation capability. The SunWave Solar AC Module can generate up to 100% reactive power (VARs) to compensate for reactive power demand by the distributed loads and improve power factor. The reactive power capability can be controlled via IntelliView. This will allow utilities to dispatch reactive power to meet local VAR demand throughout its distribution network.

The SunWave Solar AC Module can be modeled as two current sources in parallel as shown below. The amplitude of the first source, IP, is proportional to the maximum power available from the PV cells, and its frequency and phase are equal to those of the voltage of the mains. The amplitude of the second source, IQ, depends upon the reactive power commanded by the central command and control center. It has the same frequency as the voltage of the mains, but it is 90o out of phase with it. The behavior of the system is such that the SunWave Solar AC Module acts as a shunt active filter supplementing reactive current demand by the distributed loads.

IAC IL

VAC sin(t) IO

IP sin(t) IQ cos(t)

Figure 22. The SunWave Solar AC Module Equivalent Circuit

The reactive power generation capability is achieved by integrating a four quadrant inverter capable of operating as a lead compensator of reactive power. Although this may cause a slight drop in inverter efficiency, the ability to dispatch reactive power throughout the distribution network improves the transmission and distribution system efficiency and reliability.

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The reactive power capability of the SunWave Solar AC module can be dispatched using a reactive power command (Q) via the Smart Energy Portal, which is relayed to the SunWave SEM. Figure 23 shows the operation of the SunWave Solar AC module with a reactive power command of zero (Q=0) while Figure 24 and Figure 25 show the operation with a 100VAR command (Q=100VARs) and 200VAR command (Q- 200 VARs), respectively. Note that although reactive power is dispatched, the SEM continues to operate at full maximum power limited only by the volt-ampere (VA) rating of the SEM. The SEM is also capable of dispatching reactive power with no real power as shown in Figure 26. This may be the case when excess solar generation is present so as to limit the voltage rise in the distribution network.

Figure 23. No Reactive Power (0 VARs); 100%Real Power (200 W)

O-16 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 620 of 859

Figure 24. Reactive Power = 100 VARs; Real Power = 179 W

Figure 25. Reactive Power = 200 VARs; Real Power = 150W

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Figure 26. 100% Reactive Power (200 VARs); No Real Power (0 W)

O-18 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Power Line Contractors, Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 622 of 859

Appendix P – Cyber Security Per Attachment 8, Section 3 of the RFP, this appendix describes the basic cyber security features of the Petra Systems SunWave AC Module and IntelliView System.

P.1 Communication Security Communication network security is paramount for a distributed smart grid network. All Petra Systems data is encrypted, from the smart grid appliances to aggregation points and through the backhaul network to the database at the network operations center. Similarly, network management software and web portal access use strong data encryption.

Wide area network (WAN) security includes multiple levels of security including VPN-IPSec with IKE/ISAKMP, multiple tunnel support, up to 256 bit AES encryption and VPN pass-through with GRE forwarding. Local ZigBee security includes multiple security layers including Trust Center Authorization, Link and Network Keys, and 128 bit AES encryption. Figure 27 shows a high level view of end to end security of the Petra Systems SunWave solution.

Figure 27. High-level View of Petra Systems SunWave Solution Security

P.1.1 Local Area Network (LAN) The link between the AC Modules and the SunWave Communicator is implemented with a standard compliant 802.15.4 wireless physical layer utilizing an AES hardware data encryption engine.

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The protocol of data transfer is a proprietary unpublished communication method developed by Petra Systems for LAN use.

P.1.2 Wide Area Network (WAN) The WAN link from the SunWave Communicator to the cellular data centers is achieved with the standard GPRS protocols utilizing authentication protocols and encryption algorithms.

The SunWave Communicators in the network will be assigned Private Fixed IP Addresses rather than public dynamic addressing, ensuring the access points are not exposed to the Internet, reducing the risk of spam, virus, hacking and Denial of Service attacks.

P.1.3 Data Center Connectivity A Gateway GPRS Support Node (GGSN) is a network node that acts as a gateway between the GPRS wireless data network and the link to the Petra Systems Data Center. The GGSN forms an anchor point, which enables mobility of your devices across your GPRS / UMTS networks. The GGSN authenticates and routes the data securely utilizing a Virtual Private Network (VPN) between the Wireless network and the Petra Systems Data Center. The link also provides session redundancy for optimum security. Other secure cellular technologies may be substituted is non-GPRS/UMTS networks provide a higher level of service.

P.1.4 System Access Operator and Administrator access to the systems via Internet browser incorporates 128 bit SSL (Secure Sockets Layer) encryption. SSL scrambles (or encrypts) data using a code (also referred to as a key) that is known only to the data's sender and recipient. The encrypted data is unreadable unless it is unscrambled using the correct key. Regardless of the path the data takes on the Internet, it remains secure because only the intended recipient has the key that will unlock the data. SSL technology is widely accepted and used in Web browsers and a variety of other Internet software making it a truly private means of communication.

P-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 624 of 859 Bid Summary

Bidder: Powerline Contractors

System Size Number Location (street, town, zip) (kW dc) Total Cost in $ $/Watt 1 Billerica - 1,706 300w Sunwaves 512 2 Brockton - 1434 430 3 Norton - 1565 470 4 Attleboro - 1668 500 5 Fall River - 1815 545 6 Quincy - 1855 557 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Totals

Volume Discount offered? If more than 100 kW total purchased % discount If more than 200 kW total purchased % discount If more than 500 kW total purchased % discount If more than 2,000 kW total purchased discount/kW If more than 3,000 kW total purchased discount/kW Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 625 of 859

Solar PV Array Information Site Number: EXAMPLE 1 2 3 Bidder: ABC Solar, Inc. Powerline Contractors Powerline Contractors Powerline Contractors Street 72 Sunny Street Town Attleboro Billerica - 1,706 Units Brockton - 1434 Norton - 1565 Zip Code 02730 01821 02301 02766 System Size (kilowatts dc) 60 511.8 430.2 469.5 Module Tilt (degrees) 5 30 30 30 Array Azimuth (S=180) 175 180 180 180 Row Spacing (feet between) 2 N/A N/A N/A Inverter Manufacturer: Solectria Petra Systems Petra Systems Petra Systems Inverter Model Number PVI-50 2.1 2.1 2.1 Inverter Size (kW ac) 50 0.215 0.215 0.215 Number of Inverters 1 1706 1434 1565 Module Manufacturer: Jinko LG LG LG Module Model JKM305M-72 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 Tier 1 Manufacturer? (yes/no) yes Yes Yes Yes Size of Module (Watts dc) 300 300 300 300 Total Number of Modules 200 1706 1434 1565 Modules per String 11 111 Tamper Proof Mounting? no, roof mounted Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Racking Manufacturer RBI Petra Systems Petra Systems Petra Systems Racking Model RM-B UR2 UR2 UR2 Racking type (roof, ground, etc.) roof Pole Pole Pole Type of roofing Material? Standing Seam N/A N/A N/A Structural work needed? no N/A N/A N/A Expected lifespan of roofing material 20+ Years N/A N/A N/A Combiner Box Manufacturer: Solectria N/A N/A N/A Combiner Box Model Discom4 N/A N/A N/A Number of Combiner Boxes 1 N/A N/A N/A DC Disconnect Manufacturer: (part of CB) N/A N/A N/A Number of DC Disconnects 1 N/A N/A N/A DAS Manufacturer: Solectria Petra Systems Petra Systems Petra Systems Model SolRen Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Irradiance Meter? yes No No No Module temp monitor? yes No No No Weather Station? yes No No No Performance Model Available? yes Yes Yes Yes Type of Model PVSYST PVsyst PVsyst PVsyst Expected Annual kWh (ac) output 64,489 682,677 573,861 626,285 Status of Final design? Near complete, 75% Near complete, 80% Near complete, 80% Near complete, 80% List permits Obtained: Building, Planning N/A N/A N/A Lease at Host? Yes N/A N/A N/A Term (years) 20 N/A N/A N/A Cost per year of Lease Copy of lease attached? Yes N/A N/A N/A

Project is roof mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Brief Description of status of Project design in near complete, design is completed. System design is completed. System design is completed. System permits have been obtained, to be deployed in multiple to be deployed in multiple to be deployed in multiple

Pricing Summary: Permits and Engineering Inverter Cost Module Cost Racking Cost Site Improvement Cost Balance of System Interconnection Cost Total Purchase Price of System Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 626 of 859

Solar PV Array Information Site Number: 4 5 6 Bidder: Powerline Contractors Powerline Contractors Powerline Contractors Street Town Attleboro - 1668 Fall River - 1815 Quincy - 1855 Zip Code 02703 02720 02169 System Size (kilowatts dc) 500.4 544.5 556.5 Module Tilt (degrees) 30 30 30 Array Azimuth (S=180) 180 180 180 Row Spacing (feet between) N/A N/A N/A Inverter Manufacturer: Petra Systems Petra Systems Petra Systems Inverter Model Number 2.1 2.1 2.1 Inverter Size (kW ac) 0.215 0.215 0.215 Number of Inverters 1668 1815 1855 Module Manufacturer: LG LG LG Module Model LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 Tier 1 Manufacturer? (yes/no) Yes Yes Yes Size of Module (Watts dc) 300 300 300 Total Number of Modules 1668 1815 1855 Modules per String 111 Tamper Proof Mounting? Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Racking Manufacturer Petra Systems Petra Systems Petra Systems Racking Model UR2 UR2 UR2 Racking type (roof, ground, etc.) Pole Pole Pole Type of roofing Material? N/A N/A N/A Structural work needed? N/A N/A N/A Expected lifespan of roofing material N/A N/A N/A Combiner Box Manufacturer: N/A N/A N/A Combiner Box Model N/A N/A N/A Number of Combiner Boxes N/A N/A N/A DC Disconnect Manufacturer: N/A N/A N/A Number of DC Disconnects N/A N/A N/A DAS Manufacturer: Petra Systems Petra Systems Petra Systems Model Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Irradiance Meter? No No No Module temp monitor? No No No Weather Station? No No No Performance Model Available? Yes Yes Yes Type of Model PVsyst PVsyst PVsyst Expected Annual kWh (ac) output 667,504 726,330 742,337 Status of Final design? Near complete, 80% Near complete, 80% Near complete, 80% List permits Obtained: N/A N/A N/A Lease at Host? N/A N/A N/A Term (years) N/A N/A N/A Cost per year of Lease N/A N/A N/A Copy of lease attached? N/A N/A N/A

Project is pole mounted and Project is pole mounted and Project is pole mounted and Brief Description of status of Project design is completed. System design is completed. System design is completed. System to be deployed in multiple to be deployed in multiple to be deployed in multiple towns. towns. towns. Pricing Summary: Permits and Engineering Inverter Cost Module Cost Racking Cost Site Improvement Cost Balance of System Interconnection Cost Total Purchase Price of System Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 627 of 859

Solar Energy Solutions®

Solar PV Facility EPC Pricing and Qualifications Presented to National Grid, in response to their RFP: Solar Phase II Initiative For sites in Charlton, Leicester, and Northbridge, Massachusetts May 6, 2014

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 628 of 859

May 06, 2014

Arthur Scott Senior Procurement Specialist – Generation Global Procurement National Grid 175 East Old Country Road Hicksville, New York 11801

Mr. Scott,

PowerSecure is pleased to submit the following proposal to National Grid in response to the Request for Proposal for Phase II.

PowerSecure is far beyond a leading solar EPC service provider, in that we are an Integrated, Turnkey, Distributed Generation and Utility Infrastructure provider.

The following are some of PowerSecure’s key distinguishing attributes:

 Utility Interconnection Experience Unprecedented in the Solar Market- 1,500MWof DG installed behind 300 utilities

 Complete In-House Turnkey Project Delivery Capability, Including O&M Service Team

 Engineering Team of 50 In-house

 Equipment Selection Process Targeted to Minimize Supply Chain Risk

 Extensive Utility Infrastructure Experience in Distribution and Substations (past performance with National Grid)

 Highly Reputable, Financially Strong, Public Company (NYSE: POWR) with many IOU Customers

PowerSecure has completed construction of more than 70 PV installations in 10 states, and currently has over 25 MW of power plants under O&M agreements. Our 2013 portfolio up-time was 99.6%, with delivered energy in excess of 100% of projections. PowerSecure’s profile should also be considered a means to mitigate risk for National Grid. We have a strong balance sheet which provides long term stability to support our warranties and O&M agreements, and are diversified across numerous product and geographic markets. We also work for several of the largest IOUs in the US

We appreciate the opportunity to provide this proposal, and look forward to discussing it with you soon.

Sincerely,

Sterling Bowen Director of Sales, PowerSecure Solar

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 629 of 859 National Grid RFP Response PowerSecure, Inc.

TABLE OF CONTENTS i. Cover Letter ii. Table of Contents

1. Bidder Information: PowerSecure 2. Experience and Project References 3. Construction and Commissioning 4. Operation and Maintenance 5. Pricing 6. Appendices

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 630 of 859

1. BIDDER INFORMATION for PowerSecure Inc.

a. Form of Legal Entity and Year Established

PowerSecure, Inc. is a Delaware Corporation, established in 2000, and incorporated in 2001.

b. Location

Corporate Headquarters: Wake Forest, North Carolina

27 Branch Offices in: North Carolina South Carolina Georgia Florida Oklahoma Connecticut Pennsylvania Maryland Pennsylvania Vermont New Jersey Massachusetts

c. Describe any changes in ownership over past 10 years

PowerSecure, Inc. is a publicly-traded company listed on the NYSE.

PowerSecure Solar was established in 2012 with PowerSecure, Inc.’s purchase of majority interest of the Utility, Commercial/Industrial and Federal Solar PV lines of business from Southern Energy Management. In 2013, PowerSecure, Inc. completed the purchase of the remaining 10% interest in PowerSecure Solar from Southern Energy Management, and PowerSecure Solar became a wholly-owned subsidiary of PowerSecure, Inc.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 631 of 859 d. Outstanding Lawsuits and Disputes

PowerSecure, Inc. is not involved in any lawsuit or dispute at this time.

e. Describe general reputation and performance capabilities of firm.

Since our founding in 2000, PowerSecure has become a leading provider of Distributed Generation (DG) in the US. We have accomplished this through innovation and a laser-sharp focus on the needs of our utility customers, combined with our engineering experience and operational capabilities. The company is a pioneer in Interactive Distributed Generation, with over 1,500 MWs of capacity deployed across the U.S. – monitored and operated via PowerSecure’s state‐of‐the art 24/7 Service Center.

PowerSecure’s experience in interconnecting over 1,200 DG projects behind over 250 utility grids, including the 10 largest Investor Owned Utilities (IOUs) in the country makes us unique in the in the solar industry. This includes over 150 MW of solar engineering, installation, and service. In addition, our NexGear power distribution manufacturing group is one of the leading manufacturers of paralleling switchgear in the US and provides PowerSecure with unique capabilities in the DG marketplace, including energy storage fabrication expertise.

Our team brings decades of experience to investor-owned electric utilities, electric cooperatives and municipalities, helping them in their work to enhance and upgrade their grid systems. The PowerSecure formula is simple: earn our utility partners’ trust and respect by delivering gold-standard work with unmatched productivity. This formula has built PowerSecure a utility client roster that includes some of the largest, most sophisticated utility- power systems in the United States. Our past performance with IOUs does include storm hardening and recovery work for National Grid.

f. Number of years respondent has been engaged in providing services

PowerSecure was established in 2000, and has operated continuously since. We are now in our 14th year of providing energy generation, infrastructure, and energy consulting products and services. There are current members of the PowerSecure staff who have greater than 25 years’ experience in the energy industry. Our solar team is comprised of a team which has performed together since 2008 and has completed 70 projects in 10 states together.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 632 of 859 g. Number of full-time employees and full-time local (Massachusetts) employees

PowerSecure employs 2 people full-time employees in the State of Massachusetts which work from an office in Lee.

h. Accreditations or qualifications for work

PowerSecure, Inc. employs Professional Engineers registered in 27 states and the District of Columbia. We are licensed to perform general or electrical construction in 42 States. PowerSecure employs numerous NABCEP – certified sales-people and installers. NABCEP is the only training of its kind in the solar industry and is the gold standard for Solar Professional Certification.

i. Funding source for projects

PowerSecure has been funded through internal cash flow since our founding in 2000. PowerSecure’s strong financial position allows most projects to be constructed using available capital and reserves, keeping overhead low. PowerSecure also has strong banking relationships, which provide us with access to low cost credit when required. Whenever possible, we draw upon our large cash reserves, currently $50 Million, to finance projects between milestones. Our bonding capacity is $150MM aggregate, with a single project limit of $50MM.

j. Audited financial statement

PowerSecure, Inc.’s most recent Annual Report is available for download at http://investor.powersecure.com/phoenix.zhtml?c=110419&p=irol-reportsannual

k. Pipeline of contracted/anticipated Solar PV Array projects

PowerSecure is currently under contract for approximately 6 MW DC of projects. These projects are expected to commence and reach completion by late-2014.

Our current O&M contracts cover 20 sites totaling 35 MW DC.

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2. EXPERIENCE AND PROJECT REFERENCES

PowerSecure serves utilities and their largest Commercial/Industrial customers with DG Engineering, Construction, and Operation across the United States. Our name is derived from our focus on securing our customer’s power needs, with industry-leading DG solutions, resulting in a third-party verified 98%+ reliability rating over 70,000 dispatches since 2006.

Additionally, PowerSecure Solar provides long term Operations and Maintenance services. Our team’s success with reliability mirrors the rest of the company- for 2013; our fleet uptime was 99.6%, with production at or above 100% of projections for all sites. PowerSecure Solar has over 25 MW under currently under O&M contract, with over 10 MW of production guaranteed to two of the country’s largest investor-owned utilities.

a. Similar projects for roof-mounted and ground-mounted PV systems

Progress Solar – One Bunn, NC 4.52 MW, Polycrystalline PV, fixed-tilt Ground Mount

PowerSecure Solar designed and constructed this array of 18,816 REC Modules on Schletter FS Fixed-Tilt Racking. This 25-acre project utilized land adjoining a correction facility which was not otherwise a candidate for development. The system is interconnected Progress Energy’s Grid. This project is currently under Operations & Maintenance Service Contract with PowerSecure Solar.

Reference Olee Joel Olsen Managing Director O2 Energies 704-897-1739 [email protected]

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 634 of 859

QVC/Liberty Media, Rocky Mount, NC Phase 1: 1 MW, crystalline PV, single axis tracker Phase 2: 2.9 MW, polycrystalline PV, fixed-tilt racking

These arrays are installed at QVC’s regional distribution facility, located adjacent to the facilities warehouses. It is interconnected into the local Electric Cooperative distribution grid. This project is currently under Operations & Maintenance Service Contract with PowerSecure Solar

Reference Lou D’Onofrio Sr. PM, Engineering & Design 484-701-6790 [email protected]

Duke Energy R&D PV Test Site, Terrell, NC 1.3 MW, ground mount, various technologies

Located on a fly ash disposal site, this is the largest PV R&D project in the southeast. PowerSecure Solar has designed and installed several different technologies: CiGS thin film, amorphous thin film, high-efficiency mono-crystalline, polycrystalline, printed thin film. Ballasted tracking and non-tracking systems are set up for comparison. These systems enable the utility to test various approaches to solar systems, including residential scenarios. PowerSecure Solar is continuing to work with the utility to add new innovative solar technologies to the project. This project is currently under Operations & Maintenance Service Contract with PowerSecure Solar. PSS is also currently engaged in the research activities at the site.

PowerSecure Solar acted as a supplier/vendor for several of the projects constructed under Duke’s Commercial Solar program, including a 2.2MW, 532kW, and 528kW systems, as well as 5 other projects ranging from 55 – 250 kW DC. These roof-top systems utilize SunLink racking, Yingli modules and SatCon inverters.

Reference Available upon request Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 635 of 859 b. Describe capability to design, engineer and construct PV systems

PowerSecure Solar is a veteran of more than 70 PV projects in 10 states and the District of Columbia. We have installed over 45 MW of solar for commercial, utility, solar project developer and federal military clients. Sites include ballasted and mechanically attached roof mounts, ground-mounted systems at green- and brown-field sites, façade-mounted and laminate thin film building-integrated PV solutions, custom-fabricated mounting systems, as well as parking lot canopies. This breadth of experience has prepared us to tackle any site, and handle even the most demanding of project criteria.

PowerSecure Solar’s PV Designers and Engineers are full-time, dedicated PowerSecure Solar employees and are fully integrated with the both operations leaders who manage fieldwork and the Field Services Group who maintain and service power plants. The Team’s close cooperation allows delivery of information about project outcomes directly to those who design the systems, ensuring that design documents are not only constructible, but utilize best life-cycle practice as well. This integration is invaluable for building safe, durable power plants.

PowerSecure also self performs work as the electrical contractor for all of our EPC work. This has several benefits for National Grid- chiefly, that we can be competitive with the cost of construction in most markets while still utilizing local (contract) labor as needed. It also means a single point of accountability- there is no finger- pointing on a PowerSecure job site. As the electrician for each job, we are able to maintain the construction standards we find necessary to deliver a resilient product to our customers.

PowerSecure’s management structure is organized to create consistency in design, procurement and construction. As a lean group that touches all projects, it is possible for PowerSecure’s management team to identify and implement efficiencies across multiple projects, and immediately apply improvements that are discovered during post-close out debriefs to current projects.

PowerSecure had developed its own Quality Assurance program, and field personnel receive regular trainings and weekly toolbox talks based on this material. Each solar project is also supported by our quality team, who perform inspections at many points during construction. The field team is presented with the observations of the quality team, and field leads then develop action plans to complete these “punchlist” corrections.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 636 of 859

End-to-end, our team is built to deliver the highest reliability in the industry.

For more details on our team, please download our Statement of Qualifications at http://www.powersecuresolar.com/assets/documents/PowerSecureSolarSOQ.0414.pdf.

d. Provide a list of references from previous customers

Please refer to Part a. of this Section for each project-specific references.

APPENDIX A also includes letters of reference from other PowerSecure customers.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 637 of 859 3. CONSTRUCTION AND COMMISSIONING a. Description of each proposed PV system

PowerSecure has proposed to utilize three of the National-Grid owned sites for ground- mounted PV arrays (Charlton, Leicester, and Northbridge). It was our evaluation that the elimination of a requirement to negotiate a lease provided highest value; additionally, the sites allowed us to propose more cost effective solutions due to size (max allowable capacity) and technology (ground-mount vs. roof-mount). The systems proposed are effectively identical, even though the azimuth may vary slightly (potential to shift azimuth is addressed in each site specific narrative below).

The proposed arrays will include 3,528 SolarWorld Plus SW 280 mono modules mounted to PanelClaw Sun Bear ground mount racking. Panel Claw was selected as the racking vendor, based on RFP requirements for requested height and also a preference for Massachusetts- sourced materials where possible. Total AC power of each array is 1000 kW. Total DC power of the arrays will be 988 kW. The modules are a US-sourced product. In addition, the higher power density from the use of mono-crystalline (vs. polycrystalline) modules allows for a smaller footprint, which reduces site costs, and offers an additional, small improvement in energy output per kwp/DC.

The arrays consist of a single Advanced Energy AE 1000NX inverter. This inverter was chosen because it has a wide power factor band and has advanced remote control capability. In addition, the inverter manufacturer has provided test data to substantiate the power factor capability of this inverter. The alternate inverters are a pair of Solectria SGI 500XTM inverters. Those inverters were chosen as alternates because although they also have a wide range of power factor capability, the remote control capability is not as robust and there is also no test data available to support the power factor capability of the inverters. In addition, the transformer requirements for the Solectria inverters are more restrictive than those for the Advanced Energy inverter. Solectria inverters would meet the RFP preference for Massachusetts-based manufacturers and also the preference for multiple inverters for larger arrays. Regarding the later item- PowerSecure has past experience with Advanced Energy which makes us very comfortable in our ability to provide National Grid very high up time even with a single inverter.

The inverter(s) will be protected by DC circuit breakers on the PV Output Circuits and a single AC circuit breaker on the output of the inverter. These items will be separate from the inverter for ease of maintenance. AC power from the inverter(s) will be sent to a single 1MVA transformer. In the case of the Solectria inverters, this transformer will be required to have two Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 638 of 859 separate sets of secondary windings, one for each inverter. The medium voltage system will be protected by fuses at a ground mounted switch on the site and by the recloser located off site.

Array Specific Narrative- Charlton/Carpenter Hill Road Site

The array was designed at a 195 degree azimuth (15 degrees west of true south). This azimuth was selected for two reasons. First, a west rotated azimuth will provide higher power output in the afternoons versus a true south azimuth. Second, the angle was selected to align with the winter shade line to the west of the array. This array will have some shade to the east on winter mornings, but should have no shade in the afternoons throughout the year. Since the site is large compared to the size of the array, the azimuth of this array could be adjusted from 210 degrees to 180 degrees with minimal change to cost or to the amount of tree clearing.

Array Specific Narrative- Leicester/Stafford Street Site

The array was designed at a 210 degree azimuth (30 degrees west of true south). This azimuth was selected for two reasons. First, a west rotated azimuth will provide higher power output in the afternoons versus a true south azimuth. Second, the angle was selected to align with the existing power line easement to the southwest of the array. Due to the small size of the site and the fact that the site is bisected by a power line easement, the location of the array will cause some shading in the winter This array will have some shade to the east and south on winter mornings, but should have minimal shade in the afternoons throughout the year. Due to the site size and obstructions, the azimuth of this array cannot be adjusted more than approximately ±2 degrees without a change to cost or to the amount of tree clearing.

Array Specific Narrative- Northbridge/Douglas Road Site

The array was designed at a 201 degree azimuth (21 degrees west of true south). This azimuth was selected for two reasons. First, a west rotated azimuth will provide higher power output in the afternoons versus a true south azimuth. Second, the angle was selected to align with the existing power line easement to the west of the array. Due to the small size of the site and the fact that the site is bisected by a power line easement, the location of the array will cause some shading in the winter This array will have some shade to the east and south on winter mornings, but should have minimal shade in the afternoons throughout the year. Due to the site size and obstructions, the azimuth of this array cannot be adjusted more than approximately ±2 degrees without a change to cost or to the amount of tree clearing.

Cutsheets for Major System Components are included with this proposal in APPENDIX B.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 639 of 859

A letter of support from Advanced Energy is also included in APPENDIX B. To meet the requirement of the RFP for a real to reactive power ratio of 60%, we have provided a solution which maximizes energy in any environment where VAR support is NOT needed, but can also be modified on-the-fly to meet this real/reactive power ratio requirement by curtailing (remotely, by signal from National Grid) the capacity of the inverter.

b. Provide energy production capacity methodology used

PVSyst energy production models for all base and alternates bids are included in APPENDIX D. Each model provides graphical representation of all factors utilized to generate a projected output. PV Syst is widely accepted modeling tool within the solar industry.

c. Description of proposed site preparation work

The selected (National Grid-owned) sites are all wooded, and must therefore be cleared prior to construction, and be provided final vegetation. Best Management Practices (BMPs) will be utilized during construction, and all necessary Environmental permits will be prepared and filed.

PowerSeucre is already working with regional contractors to develop site budgets (and subcontracting relationships) to cover the following basic scope:

a. Preparing and filing both the SWPPP with the EPA, and processing the local conservation commission/MA DEP’s “Order of Conditions” b. Clear and grub timber on site; remove spoils c. Utilize mulch from waste on site as needed to control erosion d. Provide silt and tree protection fencing around site e. Rough and Fine grading upon completion of grubbing (no major cut and fill is anticipated; SunBear has a tolerance for % change in grade within the conditions of each proposed array location).

Upon completion of solar/electrical construction, the following permanent site improvements will be made: a. Site fencing (per NEC requirements for enclosure of 1000V electrical systems) b. Permanent storage shed c. 20’ x 60’construction entrance (rock) d. 100’ x 6’ access road inside array (ABC) e. Seeding (one seeding will actually be done prior to start of solar construction, with one final, to ensure vegetation takes hold)

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 640 of 859 d. Sample protocol that describes testing and commissioning for each PV system

System performance starts with quality construction. Each PowerSecure Solar project is supported by our internal Quality Assurance/Quality Control (QA/QC) Team, made up of members of our service team. This team visits the project at intervals based on milestones and certain ramp-up activities. After each inspection, the field team is presented with the observations of the QA/QC Team, and instructed of any necessary corrections needed to comply with the project requirements. Since this team provides service to operational PV plants, they are best able to discern that construction methods of are of the quality necessary to ensure exceptional long-term performance.

See APPENDIX E for a commissioning/testing checklists and sample inverter inspection report.

e. Detailed schedule for engineering, procurement and construction each PV system

See APPENDIX E for a detailed schedule/gantt chart. Total duration expected to be 148 calendar days, which will allow for commercial operation within the timeframe specified in the RFP (assuming a NTP of July 9, 2014)

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 641 of 859 4. OPERATION & MAINTENANCE (O&M) a. Describe capability and cost to provide the required five years of PV system operation and maintenance

PowerSecure provides O&M services for two IOUs currently- Duke Energy Carolinas, and Dominion Virginia Power. It is a core competency of our team, as evidenced by the letter of reference from another client, O2 Energies, in APPENDIX A.

Pricing National Grid Draft O&M PowerSecure Recommended Location Requirements Scope (5 years) Scope (5 years)

Charlton site

Leicester site

Northbridge site

The draft scope includes some items which we feel would, if required by National Grid, be more appropriately provided by a property manager (IE, do not require technical staff). Further, the suggested frequency of some tasks exceeds industry best-practice by several orders of magnitude. To comply with the RFP, PowerSecure has provide pricing for fully adhering the draft scope of services; to provide best value, our recommended scope (priced above) is recommended below.

Sample O&M reporting forms are included in APPENDIX F.

Recommended PV Facility Service Scope

1. Monitoring • Review daily the system’s performance ratio (PR) utilizing the client owned Data Acquisition System (DAS);Draker Monitoring or similar. • Track the systems monthly production against it PVSYST Projected Production. • Maintain a log of all weather and utility related events that result in production losses. • Work with the DAS service Tech Support to diagnose alarms and other system alerts that result in a (PR) of less than 75% or a (PR) of less than 90% for more than three days.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 642 of 859

2. Trouble Shooting • Work with Technical Support Services to trouble shoot and correct issues remotely. If required, coordinate the dispatch of factory trained Service Technicians to the site • Notify the client if the issue will require work not covered by workmanship or manufacturer warranties to correct; provide a cost estimate for the completion of the repairs and obtain the client’s approval before performing any additional billable work. • Supply the client with a report identifying the cause of the performance issue and its resolution. • Invoice the Client within ten business days for any approved Additional Services. • Assist the Client in processing warranty claims against any manufacturer’s warranty.

3. Service Level Agreement (Sla) • Respond to the Client’s request for Additional Services or system alerts, by email or voice within one business days. • Make best effort to provide the Client with a solution to site issues within three business days.

4. Bi-Annual Site Inspections • Visual inspection of the PV System including the following: - Modules, racking, combiners and DC Array grounding. - Conductors, their insulation, terminations and raceways. - Disconnects, switches, breakers, inverters, transformers and monitoring equipment. - Equipment labeling, site signage and fencing. • Tests and additional inspections: - Manually check the operation of all disconnects. - Thermal Scan all field installed terminations and re-torque as needed. - Test and record individual String ‘Short Circuit Current’ and ‘Open Circuit Voltage’. - Megger Test the DC circuit wiring. - Perform all manufacturer warranty requirements. - Repeat Performance Test. - Confirm monitoring data accuracy and verify functionality of meterological station and other monitoring hardware • Reports - Inform manufacturer and customer of all deficiencies and recommendations. - Provide inspection report within 30 days of inspection. Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 643 of 859

5. Records Keeping • Record all service activities specified by the warranty requirements of the applicable equipment manufacturers. • Maintain a record of all PSS maintenance activities at the site. • Obtain and keep copies of all equipment manufacturer’s manuals and procedures.

6. Annual Report • Summarize the systems performance over the previous year. • Provide recommendations for system improvement. • Include a copy of the Maintenance Log.

7. Additional Services Rates • Additional Services shall be performed at the PS Solar Rates as follows:

Project Manager Engineer Senior PV Service Technician Assist. PV Service Technician

• Rates are for labor performed on site, pre-approved by the Owner, and not included in the Site Management Program scope or any PSS Workmanship Warranty. • Minimum Charge is one hour per service call. • Dispatch Fee will include travel time, air transportation, lodging, meals and incidentals plus 10% mark-up. Mileage charges of $0.56/mile will apply for any travel via PSS vehicle as measured from nearest PS Solar Office. • Examples of some of these Additional Services include: - General PV system maintenance and repairs - IV Curve Tracing (for diagnostics of string and module performance) - Additional Site Inspections - Design Reviews - Emergency Outage Response - Module replacement and disposal if not covered by the manufacturer’s warranty • Materials charges and subcontracted site services (grounds maintenance and module washing as specifically requested and approved by owner) will be billed at cost plus 25%.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 644 of 859 b. Provide location of closest PV service and maintenance professionals

PowerSecure is currently servicing assets throughout the Southeast and Mid-Atlantic out of locations in Wilmington and Charlotte. Our DG team has service technicians available in Baltimore who can be dispatched as needed. PowerSecure has electricians in Vermont and Pennsylvania which support other business units who also have PV experience and can be utilized for most service and inspection tasks as well. c. Provide sample O&M manual for PV system of similar size to proposed system

PowerSecure provides on-site training for each system owner, as well as a manual containing contact information, scope of services for O&M, and the data sheets for all installed equipment (it is not an instruction manual- attempted maintenance of equipment by non-qualified personnel will undermine the ability of PowerSecure to deliver reliable assets). Given the later items, these documents are rather large, therefore we did not feel it would aid in evaluation as examples as much of this data are already provided in this proposal. If National Grid would like to see a sample, we are of course glad to provide one, either electronically or in print form.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 645 of 859 5. PRICING STRUCTURE a. Price Proposal Form

See APPENDIX I. b. Identify any proposed discounts

Replicating the same design at two or three sites will very likely allow PowerSecure the opportunity to pass savings on engineering and management costs to National Grid, particularly if the projects can be executed at the same time. We also believe there could be significant opportunities to leverage economies of scale if two of the systems were to be installed (or even combined into a single array) at one of the sites. We are glad to explore either of these options with National Grid.

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 646 of 859 Bid Summary

Bidder: PowerSecure Inc.

System Size (kW Number Location (street, town, zip) dc) 1 Carpenter Hill Rd, Charlton, MA 01507 988 2 Stafford St, Leicester, MA 01542 988 3 Douglas Rd, Northbridge, MA 01590 988 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Volume Discount offered? If more than 100 kW total purchased % discount If more than 200 kW total purchased % discount If more than 500 kW total purchased % discount If more than 1,000 kW total purchased % discount If more than 2,000 kW total purchased % discount Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted

Solar PV Array Information Page 647 of 859 Site Number: EXAMPLE 1 1a 22a3 3a Bidder: ABC Solar, Inc. PowerSecure Solar PowerSecure Solar PowerSecure Solar PowerSecure Solar PowerSecure Solar PowerSecure Solar Street 72 Sunny Street Carpenter Hill Rd Carpenter Hill Rd Stafford St Stafford St Douglas Rd Douglas Rd Town Attleboro Charlton Charlton Leicester Leicester Northbridge Northbridge Zip Code 02730 01507 01507 01542 01542 01590 01590 System Size (kilowatts dc) 60 988 988 988 988 988 988 Module Tilt (degrees) 5 25 25 25 25 25 25 Array Azimuth (S=180) 175 195 195 210 210 201 201 Row Spacing (feet between) 2 7.01 M / 23 FT 7.01 M / 23 FT 7.01 M / 23 FT 7.01 M / 23 FT 7.01 M / 23 FT 7.01 M / 23 FT Inverter Manufacturer: Solectria Advanced Energy Solectria Advanced Energy Solectria Advanced Energy Solectria Inverter Model Number PVI-50 AE-1000NX 500-XT AE-1000NX 500-XT AE-1000NX 500-XT Inverter Size (kW ac) 50 1000 500 1000 500 1000 500 Number of Inverters 1 121212 Module Manufacturer: Jinko SolarWorld SolarWorld SolarWorld SolarWorld SolarWorld SolarWorld Module Model JKM305M-72 Sunmodule Plus Sunmodule Plus Sunmodule Plus Sunmodule Plus Sunmodule Plus Sunmodule Plus Tier 1 Manufacturer? (yes/no) yes yes yes yes yes yes yes Size of Module (Watts dc) 300 280 280 280 280 280 280 Total Number of Modules 200 3528 3528 3528 3528 3528 3528 Modules per String 11 42 (bi-polar array) 21 42 (bi-polar array) 21 42 (bi-polar array) 21 Arrays are considered tamper-resistant Arrays are considered tamper-resistant Arrays are considered tamper-resistant Arrays are considered tamper-resistant Arrays are considered tamper-resistant Arrays are considered tamper-resistant by virtue of their location behind a by virtue of their location behind a by virtue of their location behind a by virtue of their location behind a by virtue of their location behind a by virtue of their location behind a secure safety fence. At clients’ secure safety fence. At clients’ secure safety fence. At clients’ secure safety fence. At clients’ secure safety fence. At clients’ secure safety fence. At clients’ Tamper Proof Mounting? no, roof mounted request, PSS can install tamper request, PSS can install tamper request, PSS can install tamper request, PSS can install tamper request, PSS can install tamper request, PSS can install tamper resistant hardware on the modules resistant hardware on the modules resistant hardware on the modules resistant hardware on the modules resistant hardware on the modules resistant hardware on the modules which would reduce the possibility of which would reduce the possibility of which would reduce the possibility of which would reduce the possibility of which would reduce the possibility of which would reduce the possibility of module theft. module theft. module theft. module theft. module theft. module theft.

Racking Manufacturer RBI Panel Claw Panel Claw Panel Claw Panel Claw Panel Claw Panel Claw Racking Model RM-B SunBear SunBear SunBear SunBear SunBear SunBear Racking type (roof, ground, etc.) roof ground ground ground ground ground ground Type of roofing Material? Standing Seam NA NA NA NA NA NA Structural work needed? no NA NA NA NA NA NA Expected lifespan of roofing material 20+ Years NA NA NA NA NA NA Combiner Box Manufacturer: Solectria SolarBOS SolarBOS SolarBOS SolarBOS SolarBOS SolarBOS Combiner Box Model Discom4 CSK-400-28-15-N3 CSK-400-28-15-N3 CSK-400-28-15-N3 CSK-400-28-15-N3 CSK-400-28-15-N3 CSK-400-28-15-N3 Number of Combiner Boxes 1 666666 DC Disconnect Manufacturer: (part of CB) NexGear NexGear NexGear NexGear NexGear NexGear Number of DC Disconnects 1 111111 DAS Manufacturer: Solectria Draker Draker Draker Draker Draker Draker Model SolRen PV250 PV250 PV250 PV250 PV250 PV250 Irradiance Meter? yes yes yes yes yes yes yes Module temp monitor? yes yes yes yes yes yes yes Weather Station? yes yes yes yes yes yes yes Performance Model Available? yes yes yes yes yes yes yes Type of Model PVSYST PV Syst PV Syst PV Syst PV Syst PV Syst PV Syst Expected Annual kWh (ac) output 64,489 1,375 MWh (1,391 kWh/kwp) 1,375 MWh (1,391 kWh/kwp) 1,375 MWh (1,391 kWh/kwp) 1,375 MWh (1,391 kWh/kwp) 1,375 MWh (1,391 kWh/kwp) 1,375 MWh (1,391 kWh/kwp) Status of Final design? Near complete, 75% NA NA NA NA NA NA List permits Obtained: Building, Planning none none none none none none Lease at Host? Yes NA NA NA NA NA NA Term (years) 20 NA NA NA NA NA NA Cost per year of Lease Copy of lease attached? Yes NA NA NA NA NA NA

Project is roof mounted and sites proposed from pool of NGRID sites proposed from pool of NGRID sites proposed from pool of NGRID sites proposed from pool of NGRID sites proposed from pool of NGRID sites proposed from pool of NGRID properties in RFP; ground-mounted properties in RFP; ground-mounted properties in RFP; ground-mounted properties in RFP; ground-mounted properties in RFP; ground-mounted properties in RFP; ground-mounted Brief Description of status of Project design in near complete, arrays with two inverter options per site; arrays with two inverter options per site; arrays with two inverter options per site; arrays with two inverter options per site; arrays with two inverter options per site; arrays with two inverter options per site; permits have been obtained, discounts offered for procurement of discounts offered for procurement of discounts offered for procurement of discounts offered for procurement of discounts offered for procurement of discounts offered for procurement of structural review complete more than one site more than one site more than one site more than one site more than one site more than one site Pricing Summary: Permits and Engineering Inverter Cost Module Cost Racking Cost Site Improvement Cost Balance of System Interconnection Cost Total Purchase Price of System Operation and Maintenance Cost Per Year Optional Equipment Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 648 of 859

National Grid Solar Phase II Initiative Proposal for Fulfillment

Scott Zemaitatis Operations Manager

Riggs Distler & Company Inc. 4 Esterbrook Lane, Cherry Hill, NJ 08003 (856) 433-6007 [email protected]

May 6, 2014

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for Proposal –Attachment Solar Phase AG 1-3-RedactedII Initiative Page 649 of 859

Executive Summary

Riggs Distler & Company Inc. (Riggs Distler) is responding to National Grid’s call for solar energy development including the use of innovative renewable energy solutions with advanced inverter technologies in the National Grid Request for Proposal – Solar Phase II Initiative.

Riggs Distler, in conjunction with product and service provider, Petra Systems, proposes to develop 7.2 megawatts (MW) of total solar photovoltaic power generation capacity distributed on National Grid utility pole assets. Petra System’s unique solution will provide National Grid with a solar generating asset with advanced inverter capabilities and two way communication capabilities deployed across the distribution secondary in the targeted towns. As envisioned, this deployment spread across approximately 24,000 utility poles would cost National Grid $3.60/W and deliver the best long term return to National Grid’s Massachusetts customers by positioning the utility in multiple ways for grid modernization:

 Deploy 7.2 MW of solar with dynamic volt-VAR or power factor control across distribution secondary  Rapidly install and commission more than 7 MW with no investment needed for interconnection  Leverage ubiquitous utility poles and increase visibility on the utility secondary  Expandable communication backbone with grid sensors across approximately 24,000 nodes  Improve asset management of primary and secondary distribution circuits with data collection during and after install  Ancillary services may include streetlight controls, outage management and video solutions

Riggs Distler is a recognized leader in the Mechanical, Electrical and Utility construction industry. Since its founding, Riggs Distler has successfully completed projects ranging from such landmarks as the Empire State Building, the US Supreme Court, and National Constitution Center. Riggs Distler’s unique ability to provide a single contract for the mechanical, electrical, and utility needs of our clients clearly defines scope responsibilities, recognizes synergies, and lowers the project costs. Riggs Distler services customers in the Northeast, Mid-Atlantic and Southern United States.

Petra Systems is able to deliver unique solar and smart grid solutions that enable existing utility pole infrastructure to be used for rapid deployment of photovoltaic units supplying solar energy to the electric grid and providing smart grid communications.

This project will build upon the partnership that was forged between Riggs Distler and Petra Systems during the 175,000 unit deployment with PSE&G in New Jersey providing 40 MW of clean solar energy to PSE&G customers via utility-pole mounted solar units throughout PSE&G’s service territory. The team will leverage unmatched technical and personnel synergies and lessons learned to provide a streamlined deployment across these towns.

Riggs Distler will engineer, design and deliver to the National Grid a highly reliable and fully integrated Petra Systems solar photovoltaic system which meets all applicable requirements of the Request for Proposal – Solar Phase II Initiative as described in this proposal.

1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for Proposal –Attachment Solar Phase AG 1-3-RedactedII Initiative Page 650 of 859

Table of Contents 1 Introduction ...... 4 2 Bidder Information ...... 4 2.1 Bidder History ...... 4 2.2 Bidder Capabilities ...... 4 2.3 Funding ...... 5 2.4 Financial Statement ...... 5 2.5 Contracted/Anticipated Solar PV Projects ...... 5 3 Experience and Project References ...... 5 3.1 Customer Reference List ...... 5 3.2 Petra Systems Experience with Contracts of Similar Size and Scope ...... 6 3.2.1 PSE&G Solar 4 All Program – 40MW ...... 6 3.2.2 Bahrain Community Solar — 5MW Project ...... 6 4 Construction and Commissioning ...... 7 4.1 Proposed Sites ...... 7 4.2 System Description ...... 8 4.2.1 Value to National Grid ...... 8 4.2.2 Technology Selection ...... 9 4.3 Energy Production Methodology ...... 17 4.4 Site Preparation and Installation ...... 17 4.4.1 Pole Selection ...... 17 4.4.2 Handheld Database Tool ...... 18 4.4.3 Pole-mount Installation Summary ...... 19 4.5 Commissioning Procedure ...... 20 4.6 Development Schedule ...... 20 5 Operation and Maintenance ...... 20 5.1 Network Operations Services ...... 20 5.1.1 Network Operations Center ...... 22 5.2 Maintenance ...... 22 6 Pricing ...... 23 6.1 Pricing Discounts ...... 23 7 Conclusion ...... 23 Appendix A – Site/Location Compliance ...... A-1 Appendix B – Electrical Design Compliance ...... B-1 Appendix C – Design Package Compliance ...... C-1 Appendix D – Structural Analysis and Design Compliance ...... D-1 Appendix E – Interconnection Compliance ...... E-1 Appendix F - Construction Compliance ...... F-1 Appendix G – Manufacturer Qualification Compliance ...... G-1 Appendix H – Racking Compliance ...... H-1 Appendix I – Inverter Compliance ...... I-1 Appendix J – Solar Modules Compliance ...... J-1

2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 651 of 859

Appendix K – Weather Monitoring Station and DAS Compliance ...... K-1 Appendix L – Spare Equipment Compliance ...... L-1 Appendix M – Advanced Solar PV Array Compliance ...... M-1 Appendix N – Preliminary Design Package ...... N-1 Appendix O – Technology Differentiation ...... O-1 Appendix P – Cyber Security ...... P-1

3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 652 of 859

1 Introduction National Grid has released a request for proposal (RFP) for its Solar Phase II Initiative with the goal of advancing its initiative to own, operate and maintain solar energy generation facilities in Massachusetts under the Massachusetts Green Communities Act enacted in July 2008. This proposal provides the required information and additional resources regarding Riggs’ intent to develop 7.2 megawatts (MW) of solar photovoltaic power generation capacity at firm fixed price on National Grid utility pole assets, providing National Grid with a rapid path to energy cost reduction and including the capability to monitor and measure savings and support advanced inverter features for distribution grid management in support of grid modernization efforts driven by the Massachusetts Department of Public Utilities (DPU).

2 Bidder Information The Bidder of this proposal is Riggs Distler & Company Inc. (Riggs Distler), a Maryland incorporated company established in 1909 with headquarters at:

4 Esterbrook Lane Cherry Hill, NJ 08003

Riggs Distler has field offices in Rocky Hill, Orange and Plainfield, Connecticut for additional support for this proposal. Personnel from these offices may be dispatched in support of maintenance needs. Note that maintenance is likely unnecessary (see Section 5.2).

2.1 Bidder History Riggs Distler has a more than 100 year history. Riggs Distler has only grown stronger with several mergers since 2010, the most recent in March 2014 with Thirau LLC, strengthening Riggs Distler’s capabilities in the Northeast. Please refer to the Riggs Distler Introduction presentation incorporated with this proposal in the National Grid ARIBA system.

Riggs Distler is part of CVTech Group, a Drummondville (Quebec, Canada) publicly-traded company with shares listed on the Toronto Stock Exchange. CVTech is a company operating in the energy sector. The Corporation is a leading provider of construction and maintenance services to the public utility and heavy industrial markets mainly in Quebec, Ontario and the eastern United States. Through its subsidiaries, the Corporation provides maintenance and construction services for electricity transmission and distribution networks, substations and electrical power houses, as well as the control of vegetation on rights-of-way for electrical lines.

Riggs Distler has no outstanding lawsuits or disputes.

2.2 Bidder Capabilities Under One Hat, One Contract, One Responsibility. Riggs Distler is uniquely qualified to provide cost saving solutions for clients’ needs by offering a single source for an integrated Civil, Structural, Mechanical, Utility, and Electrical project approach. Riggs Distler’s design, scheduling, and procurement

4 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 653 of 859 capabilities take advantage of synergies by reducing or eliminating duplication and inefficiency. Riggs Distler’s integrated execution process provides clients with:

 A Single Point of Contact & Accountability  An Integrated Team Focused on One Set of Goals and Objectives  A Quality System which drives Efficient Project Execution  A Safety program which ensures World Class Performance  A Dedicated Management Team with the Skills, Resources, and Empowerment to keep the project on the right track

Riggs Distler has a Quality Assurance Quality Control program for all Company Operations. All work processes are constantly reviewed and updated to assure that work is fully compliant with code requirements and customer’s expectations. Riggs Distler holds ASME Certificate of Authorization and National Board of Boiler and Pressure Vessel Inspectors Certificate of Authorization, PP, U, A, R, and N Stamps.

In business since 1909, Riggs Distler has between 1,000 and 1,500 employees at any given time, backed by 265+ overhead line trucks, 215+ pieces of overhead line equipment, 190+ vans, pickups and underground line trucks, and 188+ pieces of underground equipment.

Petra systems has 3 Massachusetts employees and is capable of contracting manufacturing of its inverters to Massachusetts-based operations of existing suppliers, albeit at an additional cost.

2.3 Funding Riggs Distler employs both 3rd party funding and self-funding to projects on a project by project basis. This project is self-funded.

2.4 Financial Statement Riggs Distler has provided an audited financial statement as an attachment to this proposal in the National Grid ARIBA system.

2.5 Contracted/Anticipated Solar PV Projects Riggs Distler has provided, if applicable, a pipeline of contracted/anticipated Solar PV Array projects as an attachment to this proposal in the National Grid ARIBA system.

3 Experience and Project References Riggs Distler was the installer and maintenance contractor for New Jersey utility PSE&G’s 40 MW pole- mount deployment which is described in section 3.2.1. Riggs Distler and Petra Systems worked closely on this project and developed an excellent working relationship which will carry through to National Grid’s Solar Phase II Initiative.

3.1 Customer Reference List Customer references for Riggs Distler and product/service provider, Petra Systems, have been provided as attachments to this proposal in the National Grid ARIBA system, RFP Section 4.2.

5 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 654 of 859 3.2 Petra Systems Experience with Contracts of Similar Size and Scope Petra Systems has completed major pole-mount AC module solar projects in New Jersey, California, Bahrain, Jordan and other locations. Two of Petra Systems’ key projects are described here.

3.2.1 PSE&G Solar 4 All Program – 40MW In July 2009 the New Jersey Board of Public Utilities approved a 40 megawatt (MW) distributed solar photovoltaic (PV) project carried out by Public Service Electric & Gas (PSE&G), the largest utility in New Jersey. The system was supplied and operated by Petra Systems to generate power through smart solar systems installed on approximately 175,000 utility poles in the more than 300 towns and cities that PSE&G serves.

Figure 1. Petra Systems Smart Solar Deployed On Utility Poles along Rt. 22 in New Jersey The pole-mounted solar units provide numerous benefits to PSE&G customers and the State of New Jersey. The power generated is tied directly into the electric grid to be used by all PSE&G electric customers. Each pole-mounted solar unit placed in service generates value from:

1) Sale of its electricity and capacity into the wholesale electric grid 2) Solar Renewable Energy Certificates (SRECs) produced 3) Federal investment tax credits

PSE&G monetizes all of this value and the dollars are returned to customers by offsetting the overall cost of the program. Additionally, the pole-mounted solar units help New Jersey reach its renewable energy portfolio requirement, which was set in the State Energy Master Plan. PSE&G is taking advantage of previously untapped resources — space on utility poles — without the cost, permitting and land use. The project helped to create jobs and drive economic development by making New Jersey a leading state for solar power.

3.2.2 Bahrain Community Solar — 5MW Project Let Bahrain Shine is a collaborative project among Petra Systems, Caspian Energy Holdings, the Bahrain National Oil and Gas Authority (NOGA), Bahrain Petroleum Company (BAPCO), the Bahrain Electricity & Water Authority (EWA), academia, industry, and government. The deployment builds a foundation for future smart grid applications such as outage management, AMI, street light control and demand response. It is the first step in building a smart community with advanced smart energy technologies.

Located in the Awali Community, the University of Bahrain and other locations in Bahrain, the project provides a 5 MW highly distributed solar power plant with estimated annual energy production of 4.2 million kWh.

6 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 655 of 859

Figure 2. Petra Systems Smart Solar Deployed at Awali in Bahrain (Pole and Car Parks)

4 Construction and Commissioning Riggs Distler proposes to develop 7.2 megawatts (MW) of DC-nameplate solar power generation on National Grid utility poles in the towns listed in Table 1. Note that pole counts for towns were estimated and actual sizes can only be determined after receipt of pole asset information and survey. The general approach that Riggs Distler proposes is the use of pole-mount solar AC modules directly grid-connected to the 120V distribution secondary. SunWave AC Modules from Petra Systems have been deployed in New Jersey by utility PSE&G providing 40MW of power on approximately 175,000 utility poles and shown to be extremely flexible for deployment across a wide variety of conditions

In using these proven and flexible solar solutions, Riggs Distler expects to maximize returns for National Grid while simultaneously providing a model and basis for expansion throughout National Grid territory. The proposed solution also provides National Grid with significant ancillary benefits including advanced inverter features in support of Massachusetts DPU and National Grids grid modernization programs.

4.1 Proposed Sites Riggs Distler proposes to deploy the total 7,234 kWDC of pole-mount solar units at the sites presented in Table 1. Table 1 summarizes the sites which are detailed in RFP Attachment 2- Solar PV Array Info Sheet which is incorporated with this proposal as an MS Excel spreadsheet uploaded to the National Grid ARIBA system. In any discrepancy between Table 1 and the Solar PV Array Info Sheet MS Excel file, the Excel file shall take precedence.

Table 1. Summary of Proposed Sites and Capacity Site Town Size (kWDC) 1 Fall River 1815 545 2 Attleboro - Norton - 3233 970 3 Brockton - Stoughton - 2192 658 4 Quincy District - 2989 897 5 Grafton District - 2596 779 6 Gloucester Region - 1650 495 7 Devins Region - 1373 412 8 Swansea - Dighton - 1486 446 9 Abington - Hanover - 1153 346 10 Marlborough - 1332 400 11 Billerica - 1650 495 12 Tewksbury Andover - 2635 791

7 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 656 of 859 4.2 System Description Riggs Distler will provide a comprehensively supported, integrated, PV solar solution comprising the Petra Systems SunWave Solar AC solution. The SunWave solution mounts on existing National Grid utility poles above the communications zone eliminating permit issues, and connects directly to the distribution secondary for increased energy harvest and reduced line losses. Leveraging smart grid type communications, the SunWave solution also offers advanced inverter features (see 4.2.2.4.1) in support of National Grid grid modernization efforts.

Operations will be managed via Petra Systems network operations center (NOC), with National Grid access via secure web browser, using the IntelliView management system connected by virtual private network to cellular wireless service provider infrastructure bearing communications to the distributed PV solar solution. IntelliView is also used for reporting system energy production and controlling grid modernization features.

The solution also includes mounting racks, complete support and training in use of the IntelliView management portal, and safety procedures around deployments.

4.2.1 Value to National Grid The Petra Systems SunWave AC module pole-mount solar solution has features and capabilities beneficial to National Grid well beyond solar energy production. Benefits are summarized here. Many of these benefits are detailed in Appendix O.

 Advanced inverter features to support National Grid grid modernization efforts  Capability for streetlight management – on, off, maintenance alerts, etc.  Distributed solar generation benefits such as reduced line losses  Ability to shift peak via azimuth by varying deployment  Reduced duty life on tap changers, voltage regulators and switched capacitor banks  Reduced reliance on Line Drop Compensation, thus enabling a more uniform voltage profile across the feeder and laterals  Aesthetically pleasing community showcase of commitment to renewable energy  Leverages existing pole assets  No environmental impact studies or issues  Reliability - no single point of system failure  Increased energy harvest vs. traditional deployments  Immediately and incrementally deployable  No permitting, land use concerns or zoning issues  Opportunity to leverage sensor data for activities such as CVR and outage restoration  Rapid installation  Incremental deployment and rolling commissioning capability builds rated-base assets quickly  Two way communications deployed with solar solution  Storage-ready solar solution  Access to experienced line crews

8 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 657 of 859 4.2.2 Technology Selection Solar AC modules have been proven in recent years to support increased energy harvesting, enhanced safety and improved deployability versus traditional DC string solar solutions. Riggs Distler will use Petra Systems SunWave™ AC modules for this project, enabling highly modular, incrementally deployable solar units on all possible National Grid utility poles in the selected towns. Further information regarding the benefits of solar AC modules and Petra Systems solutions may be found in Appendix O of this proposal. Cut sheets for major components are listed in Appendix N and have been uploaded to the National Grid ARIBA system.

4.2.2.1 Petra Systems Product Ecosystem The Petra Systems product ecosystem is presented in Figure 3. As shown, the Smart Energy Portal views demonstrate data access via the IntelliView platform. Data center management is part of the NOC services. Figure 4 further demonstrates the Petra Systems position in the context of electrical transmission and distribution. More product details are provided in subsequent sections of this proposal. The Petra Systems product ecosystem comprises the SunWave™ solar AC Module which combines a single solar panel, the Petra Systems Smart Energy Module (SEM™) and pole-mount rack. Also included is the Petra Systems SunWave Communicator™ which is part of the data management and control system for the solution. Finally, the IntelliView™ management portal solution is provided as a means of access to system data as well as for management and control.

The SunWave System features bidirectional communication between pole-mount solar units and the network operations center. Each Petra Systems smart energy module acts as a smart grid appliance and automatically becomes a two way communications node on a distributed wireless communication network of Petra Systems devices using standardized ZigBee® protocols over IEEE 802.15.4 physical layer. This communication network is then aggregated by the Petra Systems SunWave Communicator™ and data is backhauled to the data center. The backhaul may take on any form that is suitable for the operator, including wired, fiber optic, and wireless. Wireless networks, including WiFi and cellular (the proposed option), are often used for ease in network deployment. With this smart grid network in place, all of the management, control, diagnostic, optimization and sensing capabilities of smart grid appliances can be managed by a network management system (NMS) software module in IntelliView from the NOC, or remotely through secure web browser.

9 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 658 of 859

Figure 3. Petra Systems Product Ecosystem

Figure 4. Petra Systems in the Context of Electrical Transmission and Distribution

4.2.2.2 SunWave Smart Grid and Distributed Solar Benefits As part of any Petra Systems SunWave solar deployment, smart grid benefits are also distributed, enabling significant electric grid reliability and efficiency capabilities as well as ancillary benefits. The distributed solar units create infrastructure increasing visibility into the distribution network and adding granularity to the data available for managing the grid. This in turn enhances the operator’s ability to improve reliability and efficiency. For example, voltage measurement and optional reactive power controls enable conservation voltage regulation and volt-VAR optimization on the grid at the operator’s discretion (see section 4.2.2.4.1, Appendix M and Appendix O). Other benefits include potential support for outage management/restoration systems, theft of service detection and street light control. Petra Systems smart grid communications can be as extensive or as compact as desired by the system operator, and many options are possible to expand even beyond the smart grid capabilities described here.

10 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 659 of 859 4.2.2.3 PV Solar Module Petra Systems uses high quality crystalline photovoltaic solar panels from LG for its integrated AC module solar units. The panels used undergo rigorous quality control, with manufacturing meeting the highest International Standards: ISO9001:2000 quality and ISO14001:2004 environmental standards. The modules will meet UL1703 and IEC 61215, and have high conversion efficiency of greater than 17%. Modules carry a 10 year product warranty and 25 year output warranty and are UL certified as well as having guaranteed positive tolerance –starting at 0% to ensure power output reliability. PV modules also carry a wind load of 2400 Pascal and snow load of 5400 Pascal, and have excellent performance under low light environments (morning, evening and cloudy days).

4.2.2.4 SunWave Smart Energy Module The Smart Energy Module (SEM) integrated with each AC Solar Module provides individual monitoring, metering, and command and control of every solar panel as well as advanced inverter features. Detailed performance data can be obtained as well as rapid identification of underperforming or failed units in a large deployment. In traditional systems, automatic pinpointing of problem panels is not possible without expensive additional monitoring equipment.

At the heart of each SunWave Smart Energy Module is the SunWave inverter that optimizes the output of each individual panel, maximizing energy generation during every moment of operation and maximizing solar system output as the solution performance varies continuously with changes in sunlight intensity, shading, temperature and other operating conditions. Additionally, each SEM is capable of reporting telemetry to IntelliView including solar output voltage, frequency and current, and grid voltage and frequency, as well as solar energy produced, measured with ANSI C12.1/C12.20 certified1% accuracy.

Electrical characteristics of the SEM include the capability to support 120V AC as well as the important safety feature of UL/IEEE anti-islanding by automatically disabling power output until grid connection is established, or similarly, halting power output if grid voltage disappears.

Figure 5. Smart Energy Module (SEM)

11 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 660 of 859 4.2.2.4.1 GridWave™ Advanced Inverter Features Each SunWave SEM is also capable of GridWave advanced inverter features. More detail is provided in Appendix M in response to RFP Section 9.9.

GridWave solutions extend the functionality of the Petra Systems SunWave™ smart energy offerings with capabilities supporting grid reliability and efficiency. GridWave solutions enable distribution utilities to proactively manage grid effects caused by renewable generation intermittency such as sudden overvoltage or under voltage conditions as well as supporting existing grid infrastructure by reducing switching frequency of on-load tap changers, voltage regulators and capacitors. GridWave solutions, based on technology developed in coordination with the U.S. Department of Energy’s Solar Energy Grid Integration Systems (SEGIS) program, are established on the concept of generator emulation which captures the inertial behavior, as well as finite and controlled impedance of a synchronous generator, to facilitate stable grid management. Providing a superset of functionality to UL 1741 operation, GridWave solutions enable utilities to move to next-generation grid reliability functionality while providing for safe return to standard UL 1741 modes. In doing so, GridWave solutions open the door for utilities to proactively manage next-generation standards benefits while maintaining required compliance standards.

Reactive Power (VAR) Management GridWave solutions support the injection of user-specified fixed reactive power to the full capacity of device operation, both leading and lagging. When commanding fixed VAR, GridWave limits real power output as needed to achieve the requested VAR output. More technical background on VAR control can be found in Appendix O.17.

Automated volt-VAR operation provides voltage regulation support by sinking reactive power if the line voltage is higher than the selected maximum voltage and by sourcing reactive power if the line voltage drops below the selected minimum voltage. No operator intervention is required other than to configure the applicable voltage range as percentages of nominal line voltage from 80% to 110%.

Power Curtailment GridWave solutions support user-specified manual and automated power curtailment that minimizes over generation to prevent power reliability issues. GridWave supports fixed power curtailment, limiting power output to a fixed maximum as a percentage of system maximum from 0% to 100%.

Automated power curtailment manages potential overvoltage situations based on temperature and frequency. Temperature-based power curtailment is always enabled; derating the power output when the operating temperature exceeds 65° C. Frequency-based automated power curtailment may be enabled and disabled as desired. Frequency-based automated power curtailment will limit real output power to manage voltage increases due to increasing grid frequency. When operating in conjunction with automated volt-VAR, automated power curtailment is only employed when the overvoltage condition is beyond the capacity of the automated volt-VAR function.

Voltage Window GridWave supports user-specified valid voltage windows within which the device operates when connected to an energized grid. Essentially, this capability allows a GridWave-enabled device to operate

12 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 661 of 859 within user-selected voltage windows (wider, narrower, or overlapping UL 1741 voltage window requirements). UL 1741 specifies two ranges of operating voltage limits; normal and fast-acting. Grid voltage excursions outside the normal (narrower) limits cause disconnection of the device after a specified number of cycles. A wider excursion outside of the fast-acting limits causes a faster disconnection. GridWave solutions follow the same model, but allow the reconfiguration of these limits.

Voltage window parameters are expressed as a percentage of the nominal operating voltage at the point of interconnection. The narrower “normal” window may be adjusted from 80% to 120% of nominal voltage, and the wider “fast-acting” window may be adjusted from 20% to 120% of nominal voltage.

Frequency Window GridWave solutions support user-specified valid frequency windows within which the device shall operate when connected to an energized grid. Essentially, this capability allows a GridWave-enabled device to operate within different frequency windows (wider, narrower, or overlapping UL 1741 window requirements). Frequency window ranges are 57Hz to 63Hz for 60Hz nominal systems and 47Hz to 53Hz for 50Hz nominal systems.

Voltage Ride-Through Voltage ride-through enables continued operation of GridWave-enabled devices for a user-specified duration within a user-specified voltage limit rather than immediately disconnecting from the grid (as per UL 1741). Generally, low-voltage ride-through (LVRT) is the key functionality enabling, for example, grid connection to be maintained during reclosing operations. High-voltage ride-through is also a capability. The voltage ride-through window is fixed (0% to 120%) of nominal voltage. The user defines the duration for which the voltage ride-through function will be enabled in the range of 0 to 300 seconds. Within this window, the device will continue to operate and smoothly return to normal operation if line conditions permit within the specified duration.

4.2.2.5 SunWave AC Module Figure 6 shows a rendering of the Petra Systems SunWave AC module comprising a PV solar module (panel) the Petra Systems SEM and pole-mount rack. The SEM is connected via certified cabling to the solar panel DC output. The AC output of the SEM then connects directly to the grid by connection into the distribution secondary.

13 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 662 of 859

Figure 6. Petra Systems AC Module (PV Solar Module with Smart Energy Module)

4.2.2.6 Solar Racking The National Grid Smart Solar deployment will use Petra Systems utility pole racks (UR-2) which are integral to the AC module solution. The rack has a fixed elevation of 30 degrees and may be mounted at any azimuth on a pole. All rack solutions shall be PE certified for Massachusetts installation. Figure 6 shows the rack as part of the solar unit solution. An assembly drawing for the rack is also provided with preliminary design package information. The rack system comes with a range of attachment types to accommodate attachment to wood, concrete, steel and aluminum poles.

4.2.2.7 SunWave Communicator The SunWave Communicator is a two-way communications system allowing individual monitoring and control of each SunWave AC Module. It also enables remote management of a large, geographically dispersed AC Module population from a centralized location. The SunWave communicator can be mounted with, or apart from, an array of SunWave AC modules. A photograph of the SunWave Communicator is provided in Figure 7.

The SunWave Communicator smart grid communications system provides three main functions.

1. Monitors and reports on the operation and health of the SunWave AC modules. This function consists of recording how much energy is generated and sending maintenance and repair alerts to the network operations center. 2. Provides tools for remote command and control of the SunWave AC modules. A remote command can, for instance, enable the generation of reactive power, a feature that increases line efficiency and helps stabilize voltage levels on the power lines. 3. Provides a cost effective backbone for other smart grid initiatives such as Advanced Metering Infrastructure (AMI) and load management or demand response programs. The SunWave technology also provides utilities with grid reliability tools. The systems constantly monitor and

14 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 663 of 859 provide real-time status updates on critical operating parameters such as voltage and frequency thereby supporting automatic power outage detection and faster repair response time.

Figure 7. SunWave Communicator 4.2.2.8 IntelliView Management Portal The IntelliView smart energy management platform comprises four main functional modules. The Energy Management System (EMS) module enables the user to access energy generation data via a secure web browser in the system owner’s operations center (Figure 8). The Network Management System (NMS) module enables communications network management and control from the operations center (Figure 9). The Grid Management System (GMS) supports management and control of GridWave advanced inverter capabilities for distribution grid management. The Lighting Control System (LCS) manages street light control deployments which are deployed using the Petra Systems communications network.

The system calibrates and stores the AC Module telemetry and enables access by authorized personnel from a web based graphical user interface (GUI). In addition, the system provides the command console used for transmitting configuration commands to the SunWave AC Modules and SunWave Communicator. The command console also makes possible the ability for remote firmware upgrades for value added application upgrades in the future.

In addition, the system can be upgraded to provide the command console used for transmitting configuration commands to the SunWave AC Modules and SunWave Communicator. The command console makes possible the ability for value-added application upgrades to the system for ancillary smart grid features such as optional added street lighting control.

15 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid Riggs Distler & Company Inc. Response to National Grid Request for ProposalD.P.U. – Solar 16-33 Phase II Initiative Attachment AG 1-3-Redacted Page 664 of 859

Figure 8. IntelliView – Energy Management Tab

Figure 9. IntelliView – Network Management Tab

16 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 665 of 859

4.3 Energy Production Methodology Petra Systems uses solar energy modeling tool, PVsyst, with fully characterized PV module and inverter profiles, based on CEC requirements, to predict energy generation for each site. The results presented in the Solar PV Array Info Sheet (uploaded to National Grid ARIBA system) take all aggregate site requirements in to account and are based on the closest TMY data available for each location. The generation information reflects inverter use only for solar energy production and does not predict generation during real power curtailment to fully utilize advanced grid capabilities and support volt-VAR or power factor management requirements.

4.4 Site Preparation and Installation One of the key benefits of the Petra Systems pole-mount AC solar solution is the ability for rapid, rolling installation and commissioning, as well as the fact that little or no site preparation is required. Installation sites, utility poles, are selected by the basic procedure described in this section. The only unlikely preparation necessary may be trimming of branches causing shading. Generally, shaded poles are simply bypassed.

Solar units mount rapidly, in 20 to 30 minutes, and begin producing power after just 5 minutes of connection, bringing the system online safely and enabling incremental commissioning.

4.4.1 Pole Selection The proper selection of utility distribution poles is an important prerequisite for a well performing system. Riggs Distler will work with National Grid to ensure appropriate poles are selected for solar deployment and to optimize Petra Systems’ GridWave advanced inverter benefits. General pole selection guidelines include:

 The pole should be in good condition (not leaning or crooked) and structurally sound; metal/fiberglass/concrete poles (e.g., streetlights,) should be assessed using the effective projected area (EPA) rating of the pole.  Select a mounting zone that will allow the solar unit to face true/solar south with minimal shading from nearby structures or trees, or from equipment or wires on the pole. The next best orientations are facing southwest or southeast if rotation will significantly reduce shading.  The pole must provide a live 120VAC line for interconnection.  The Solar Unit is approximately 30 inches tall (including the mounting channel). If it is being mounted on the street curb side of a pole adjacent to the roadway, it should not be mounted lower than the required distance above the roadway per Utility guidelines or the applicable local or national codes (whichever is more stringent).  For installations on poles where there are no curbs, the Solar Unit should be positioned a sufficient distance from the roadway to avoid incidental contact by ordinary vehicles using and located on the travel surface.  When mounting on distribution poles, a minimum clearance from communication lines, overhead electric conductors, or other electrical equipment on the pole must be per local or national electric industry standards or Utility guidelines, whichever is more stringent.

17 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 666 of 859

Figure 10. Database View of Pole Mount Installation Data

18 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 667 of 859

Figure 11. Database View of Pole Mount Installation Data 4.4.3 Pole-mount Installation Summary A detailed installation guide is available from Petra Systems for pole-mount installation of the SunWave AC module PV solar unit. Typically, solar units are assembled at a staging area and transported by the installation crews to pole locations for installation. Installation is generally performed using a bucket truck and a two man team. Experienced crews regularly install a unit in 20 to 25 minutes from parking to driving away. The process is summarized here.

19 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 668 of 859

5 Operation and Maintenance Riggs, will contract with Petra Systems to provide operations monitoring and data hosting services for the required five year duration of the program. Riggs Distler will provide direct maintenance as required.

Petra Systems Intelligent O&M Services comprise the Network Operations Center (NOC) services and IntelliView. The Petra Systems offering features remote monitoring services; energy production reporting and advanced data analytics coupled with highly skilled management of Petra’s SunWave smart solar energy solutions. This powerful combination allows customers to intelligently manage their PV systems by maximizing energy production, minimizing downtime, and ensuring maximum return on PV investments.

20 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 669 of 859

21 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 670 of 859

Figure 12. Petra Systems Operations and Support Engineers 5.2 Maintenance Necessary field maintenance of the projects shall be completed by Riggs Distler.

22 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 671 of 859

7 Conclusion Riggs Distler believes that the proposed development of 7.2 megawatts (MW) of solar photovoltaic power generation capacity on National Grid utility pole assets will provide National Grid with the best opportunity to provide energy cost reduction through renewable means while including the capability to monitor and measure savings, and support advanced inverter features for grid modernization efforts.

Riggs Distler & Company Inc. thanks National Grid for the opportunity to participate in the proposal process for the Solar Phase II Initiative and for the time taken to evaluate this proposal. Riggs Distler is prepared to answer any questions or provide additional information as necessary.

23 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 672 of 859

A-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 673 of 859

A-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 674 of 859

A-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 675 of 859

B-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 676 of 859

B-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 677 of 859

C-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 678 of 859

D-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 679 of 859

E-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 680 of 859

F-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 681 of 859

F-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 682 of 859

G-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 683 of 859

H-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 684 of 859

I-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 685 of 859

I-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 686 of 859

I-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 687 of 859

J-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 688 of 859

Table 12. Weather Monitoring Station and Data Acquisition System Compliance Item Requirement Compliance/Comment 1 A data acquisition system shall be provided by the Bidder Not Applicable. The proposed solution suitable for collecting and monitoring (locally and remotely) the comprises distributed utility pole- performance data of the solar installation, PV panels, inverters mount single panel PV units. The and the irradiance, temperature and wind speed at the facility. performance data for each PV panel and inverter, and the temperature on the inverter, will be reported from the pole-mount solar solution. The nature of the widely distributed system greatly diminishes the relevancy of the weather station data for each pole. However, Riggs Distler will supply a centrally located weather station for each town if required. 2 All data acquired by the Data Acquisition System and any Will comply. reports/publications etc. using this data shall be and remain the property of National Grid, and will be provided to National Grid at no additional cost. 3 Any monthly fee associated with leasing a communication Will comply. carrier/line and provided by a public utility such as Verizon or Comcast shall be paid by National Grid after final acceptance. Bidder is responsible for coordinating with the communication carrier to install/commission the line and any associated costs/fees to install the line. 4 The following items shall be averaged every 10 minutes, and the Items 1-4 are not applicable. Item 5, average, maximum and minimum values are stored and sent to inverter data, will comply. the DAS via a hard wired connection. The instantaneous values shall also be stored and sent to the DAS. 1) Ambient temperature 2) Module temperature 3) Solar irradiance in the horizontal plane 4) Solar irradiance in the plane of the module 5) All inverter data 5 Communication Signals and Specifications (Outgoing). Will comply, apart from weather From DAS to SmartGrid: monitoring, and pending final In the future, the performance of the solar generation plant will specification and timeline. The Petra be communicated to a SmartGrid facility – it is believed that this Systems inverter is capable of will be ModBUS. For monitoring purposes, all signals will be sent communicating through DNP3, IEC to National Grid offices. All transducers/sensors and any 61850m and Modbus calculated values listed above will be remotely monitored. Any control (e.g. start/stop) will be routed via the National Grid SmartGrid facility when it becomes available.

K-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 689 of 859

K-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 690 of 859

Table 13. Spare Equipment Compliance Item Requirement Compliance/Comment 1 The contractor shall provide five (5) spare solar modules for Riggs Distler acknowledges need for each site, including delivery, unloading and movement to a spares. Will comply with an equal or place of storage (which may not be at the solar generation site). better alternative to be negotiated due to the integral nature of the pole- mount solution.

L-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 691 of 859

M-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 692 of 859

M-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 693 of 859

M-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 694 of 859

N-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 695 of 859

N-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 696 of 859

O-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 697 of 859

Figure 13. Traditional DC String Array Solar Architecture

O-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 698 of 859

Figure 14. Modular AC Grid-tie Solar Architecture

O-3 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 699 of 859

O-4 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 700 of 859 makes the MPPT system simple and more efficient. For example, simplicity in the implementation of the MPPT algorithm will enable the inverter specification to have narrower DC input voltage, supporting more efficient tracking of the maximum power point.

O-5 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 701 of 859 match panel alignment or the inability to design solutions in a cost-effective manner for the multitude of possible variations.

O-6 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 702 of 859 affected by an accident, act of nature, or vandalism, ending in loss of the entire system. For the Petra Systems SunWave modular AC grid-tie solution, there is system survivability in such a scenario.

O-7 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 703 of 859

Figure 16. Solar Panel Efficiency in the Presence of Dust and Rainfall During the dry season the performance of the solar panels decreased at a linear rate as shown in Figure 17.

O-8 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 704 of 859

The systems are instantly commissioned, providing clean power, communications and Smart Grid capabilities which all generate a return on the utility’s investment almost immediately.

To quantify the benefits of a parallel connected PV system (AC PV approach) versus a series connected PV system (string inverter approach), tests were conducted by OKE-Services of the Netherlands to

O-9 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 705 of 859 capture the improved power harvesting capability of AC PV Modules versus string inverters under various shading conditions, namely very light to medium shading (Oldenkemp, 2004). Figure 18 shows the performance of an AC PV Module versus a string inverter under very light shading conditions (e.g. a pole or tree shadow partially covering one PV cell).

Figure 18. Results under very lightly shading conditions:

∆P AC PV/string = 4.9% at light load & ∆P AC PV/string is 9.6% at V=81.5% of Voc

81.5% Voc (Figure 19).

O-10 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 706 of 859

Figure 19. Results under lightly shading conditions:

∆P AC PV/string = 10.6% at light load & ∆P AC PV/string is 27% at V=81.5% of Voc

Figure 20. Results under medium shading conditions:

∆P AC PV/string = 12.2% at light load & ∆P AC PV/string is 216% at V=81.5% of Voc

O-11 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 707 of 859 string (in series). The increase of energy yield depends on the situation, as the presented in Figure 18 through Figure 20.

Table 17 summarizes the energy yield under the various conditions.

Table 17. Energy Harvesting Improvements with Parallel PV Systems

O-12 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 708 of 859

Generation Load Center R+jX G

Qc P+jQ

Figure 21. A simple one-line power system.

The line loss with reactive power compensation of 0.156 MVARs is given by

As a result, the reduction in line losses will be

If the total system loss is 3%, the savings in losses will be:

1 MW x 3% x 10.3% = 0.00309 MW = 3.09 kW

112 x 0.00309 x 120 x 24 = $997/year

O-13 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 709 of 859

For the previous one line system, the line current without compensation is given by,

The line current with reactive power compensation is given by,

As a result, the reduction in line current is given by,

O.16 Increased Maximum Transfer Capability The maximum transfer capability of the sample system is given as

$112 x 0.155 x 120 days x 24 hours = $49,997/year

If the compensation is scaled to $/MVAR, it is as significant as $320,492/MVAR-year.

O-14 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 710 of 859

As stated in the previous sub-section, the entity that benefits is the utility and/or transmission company since they are the network owners.

IAC IL

VAC sin(t) IO

IP sin(t) IQ cos(t)

Figure 22. The SunWave Solar AC Module Equivalent Circuit

O-15 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 711 of 859

Figure 23. No Reactive Power (0 VARs); 100%Real Power (200 W)

O-16 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 712 of 859

Figure 24. Reactive Power = 100 VARs; Real Power = 179 W

Figure 25. Reactive Power = 200 VARs; Real Power = 150W

O-17 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 713 of 859

Figure 26. 100% Reactive Power (200 VARs); No Real Power (0 W)

O-18 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 714 of 859

Appendix P – Cyber Security Per Attachment 8, Section 3 of the RFP, this appendix describes the basic cyber security features of the Petra Systems SunWave AC Module and IntelliView System.

Figure 27. High-level View of Petra Systems SunWave Solution Security

P-1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Riggs Distler & Company Inc. Response to National Grid Request for ProposalAttachment – Solar PhaseAG 1-3-Redacted II Initiative Page 715 of 859

The protocol of data transfer is a proprietary unpublished communication method developed by Petra Systems for LAN use.

P-2 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 716 of 859 Bid Summary

Bidder: Riggs

System Size (kW Number Location (street, town, zip) dc) Total Cost in $ $/Watt 1 Fall River 1815 545 2 Attleboro - Norton - 3233 970 3 Brockton - Stoughton - 2192 658 4 Quincy District - 2989 897 5 Grafton District - 2596 779 6 Gloucester Region - 1650 495 7 Devins Region - 1373 412 8 Swansea - Dighton - 1486 446 9 Abington - Hanover - 1153 346 10 Marlborough - 1332 400 11 Billerica - 1650 495 12 Tewksbury Andover - 2635 791 13 14 15 16 17 18 19 20 Totals

Volume Discount offered? If more than 100 kW total purchased % discount If more than 200 kW total purchased % discount If more than 500 kW total purchased % discount If more than 2,000 kW total purchased discount/W If more than 3,000 kW total purchased discount/W Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 717 of 859

Solar PV Array Information Site Number: EXAMPLE 1 2 345 67 Bidder: ABC Solar, Inc. Riggs Riggs Riggs Riggs Riggs Riggs Riggs Street 72 Sunny Street Town Attleboro Fall River Attleboro/Norton Brockton/Stoughton Quincy District Grafton District Gloucester Region Devins Region Zip Code 02730 System Size (kilowatts dc) 60 545 970 658 897 779 495 412 Module Tilt (degrees) 5 30 30 30 30 30 30 30 Array Azimuth (S=180) 175 180 180 180 180 180 180 180 Row Spacing (feet between) 2 N/A N/A N/A N/A N/A N/A N/A Inverter Manufacturer: Solectria Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Inverter Model Number PVI-50 2.1 2.1 2.1 2.1 2.1 2.1 2.1 Inverter Size (kW ac) 50 0.215 0.215 0.215 0.215 0.215 0.215 0.215 Number of Inverters 1 1815 3233 2192 2989 2596 1650 1373 Module Manufacturer: Jinko LG LG LG LG LG LG LG Module Model JKM305M-72 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 Tier 1 Manufacturer? (yes/no) yes Yes Yes ? Yes Yes Yes Yes Size of Module (Watts dc) 300 300 300 300 300 300 300 300 Total Number of Modules 200 1815 3233 2192 2989 2596 1650 1373 Modules per String 11 111 1 111 Tamper Proof Mounting? no, roof mounted Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Racking Manufacturer RBI Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Racking Model RM-B UR2 UR2 UR2 UR2 UR2 UR2 UR2 Racking type (roof, ground, etc.) roof Pole Pole Pole Pole Pole Pole Pole Type of roofing Material? Standing Seam N/A N/A N/A N/A N/A N/A N/A Structural work needed? no N/A N/A N/A N/A N/A N/A N/A Expected lifespan of roofing material 20+ Years N/A N/A N/A N/A N/A N/A N/A Combiner Box Manufacturer: Solectria N/A N/A N/A N/A N/A N/A N/A Combiner Box Model Discom4 N/A N/A N/A N/A N/A N/A N/A Number of Combiner Boxes 1 N/A N/A N/A N/A N/A N/A N/A DC Disconnect Manufacturer: (part of CB) N/A N/A N/A N/A N/A N/A N/A Number of DC Disconnects 1 N/A N/A N/A N/A N/A N/A N/A DAS Manufacturer: Solectria Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Model SolRen Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Irradiance Meter? yes No No No No No No No Module temp monitor? yes No No No No No No No Weather Station? yes No No No No No No No Performance Model Available? yes Yes Yes Yes Yes Yes Yes Yes Type of Model PVSYST PVsyst PVsyst PVsyst PVsyst PVsyst PVsyst PVsyst Expected Annual kWh (ac) output 64,489 726,330 1,300,664 881,861 1,202,501 1,038,872 609,408 549,423 Status of Final design? Near complete, 75% Near complete, 80% Near complete, 80% Near complete, 80% Near complete, 80% Near Complete, 80% Near Complete, 80% Near Complete, 80% List permits Obtained: Building, Planning N/A N/A N/A N/A N/A N/A N/A Lease at Host? Yes N/A N/A N/A N/A N/A N/A N/A Term (years) 20 N/A N/A N/A N/A N/A N/A N/A Cost per year of Lease Copy of lease attached? Yes N/A N/A N/A N/A N/A N/A N/A

Project is roof mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Brief Description of status of Project design in near complete, design is completed. System design is completed. System design is completed. System design is completed. System design is completed. System design is completed. System design is completed. System permits have been obtained, to be deployed in multiple to be deployed in multiple to be deployed in multiple to be deployed in multiple to be deployed in multiple to be deployed in multiple to be deployed in multiple structural review complete towns. towns. towns. towns. towns. towns. towns. Pricing Summary: Permits and Engineering Inverter Cost Module Cost Racking Cost Site Improvement Cost Balance of System Interconnection Cost Total Purchase Price of System Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 718 of 859

Solar PV Array Information Site Number: 8 9 10 11 12 Bidder: Riggs Riggs Riggs Riggs Riggs Street Town Swansea/Dighton Abington/Hanover Malborough Billerica Tewksbury/Andover Zip Code System Size (kilowatts dc) 446 346 400 495 791 Module Tilt (degrees) 30 30 30 30 30 Array Azimuth (S=180) 180 180 180 180 180 Row Spacing (feet between) N/A N/A N/A N/A N/A Inverter Manufacturer: Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Inverter Model Number 2.1 2.1 2.1 2.1 2.1 Inverter Size (kW ac) 0.215 0.215 0.215 0.215 0.215 Number of Inverters 1486 1153 1332 1650 2635 Module Manufacturer: LG LG LG LG LG Module Model LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 LG300N1C-G3 Tier 1 Manufacturer? (yes/no) Yes Yes Yes Yes Yes Size of Module (Watts dc) 300 300 300 300 300 Total Number of Modules 1486 1153 1332 1650 2635 Modules per String 111 11 Tamper Proof Mounting? Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Yes, 15' above ground Racking Manufacturer Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Racking Model UR2 UR2 UR2 UR2 UR2 Racking type (roof, ground, etc.) Pole Pole Pole Pole Pole Type of roofing Material? N/A N/A N/A N/A N/A Structural work needed? N/A N/A N/A N/A N/A Expected lifespan of roofing material N/A N/A N/A N/A N/A Combiner Box Manufacturer: N/A N/A N/A N/A N/A Combiner Box Model N/A N/A N/A N/A N/A Number of Combiner Boxes N/A N/A N/A N/A N/A DC Disconnect Manufacturer: N/A N/A N/A N/A N/A Number of DC Disconnects N/A N/A N/A N/A N/A DAS Manufacturer: Petra Systems Petra Systems Petra Systems Petra Systems Petra Systems Model Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Intelliview 1.5.0.18 Irradiance Meter? No No No No No Module temp monitor? No No No No No Weather Station? No No No No No Performance Model Available? Yes Yes Yes Yes Yes Type of Model PVsyst PVsyst PVsyst PVsyst PVsyst Expected Annual kWh (ac) output 594,670 461,410 533,038 660,300 1,054,479 Status of Final design? Near complete, 80% Near complete, 80% Near Complete, 80% Near complete, 80% Near complete, 80% List permits Obtained: N/A N/A N/A N/A N/A Lease at Host? N/A N/A N/A N/A N/A Term (years) N/A N/A N/A N/A N/A Cost per year of Lease N/A N/A N/A N/A N/A Copy of lease attached? N/A N/A N/A N/A N/A

Project is pole mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Project is pole mounted and Brief Description of status of Project design is completed. System design is completed. System design is completed. System design is completed. System design is completed. System to be deployed in multiple to be deployed in multiple to be deployed in multiple to be deployed in multiple to be deployed in multiple towns. towns. towns. towns. towns. Pricing Summary: Permits and Engineering Inverter Cost Module Cost Racking Cost Site Improvement Cost Balance of System Interconnection Cost Total Purchase Price of System Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 719 of 859

SolarCity’s Response to National Grid’s Request for Proposals Solar Phase II Initiative

Prepared By: SolarCity Contact: National Grid Contact:

SolarCity Corporation Dan Leary Arthur Scott 3055 Clearview Way Senior Project Development Senior Purchasing Agent San Mateo, CA, 94402 Manager [email protected] [email protected] (516) 545-3280 (607) 592-7046 Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 720 of 859 May 6, 2014

National Grid Attn: Arthur Scott – Sr. Purchasing Agent 175 East Old Country Road Hicksville, NY 11801-4280 Submitted Electronically via Upload to National Grid’s Online Ariba Platform

Re: SolarCity Response to National Grid’s Solar Phase II Initiative’s Request for Proposals

Dear National Grid RFP Team,

On behalf of SolarCity, we are pleased to submit this proposal to National Grid (“National Grid”) in response to the RFP for fully operational and commissioned solar PV arrays throughout select towns within Massachusetts. As the nation’s largest full service solar firm, SolarCity is uniquely qualified to help National Grid procure, own, and operate up to 20 megawatts (“MW”) of solar generation. We have outlined our key qualifications in this proposal.

SolarCity is a publicly traded company (NASDAQ: SCTY) and has deployed 567 megawatts (MW) of solar PV systems throughout the country, as of December 31, 2013. The number of cumulative customers is now over 100,000 as of December 31, 2013. In order to achieve this scale, SolarCity has raised funds sufficient to finance more than $4 billion in solar projects. Our current project financing investors include industry leading financial institutions such as Bank of America Merrill Lynch, Goldman Sachs, Credit Suisse, Google, and many more. This experience firmly cements SolarCity as one of the most experienced project financiers in the solar industry. In order to accommodate the volume and frequency of our projects SolarCity has also established an efficient corporate revolver of $200 million.

Our platform allows SolarCity to employ over 5,000 full time employees, as of March 31, 2014, and operate out of 40+ locations in 15 states, D.C., and Puerto Rico. Our closest location to the roster of proposed property locations is Marlborough, MA where we employ 100+ personnel. This presence ensures our ability to efficiently mobilize for National Grid’s selected projects and coordinate proactive Operations and Maintenance activities throughout the term of warranty and maintenance agreements.

SolarCity is the Right Partner for Solar Success: Every solar project requires teamwork. With experienced and well-qualified partners, a solar initiative, such as National Grid’s, can be a great success. SolarCity brings the keys to facilitating a successful and well managed solar project to every transaction.

Elimination of Project Risks: As a full service provider, SolarCity oversees and manages all aspects of the job; from design, permitting, to construction and operations and maintenance. SolarCity also manages all financial dependency risks associated with the construction as well – via our established corporate revolver - eliminating lengthy and uncertain financing contingencies.

Proven Track Record: SolarCity has successfully interconnected tens-of-thousands of solar PV systems and continues to make solar power a smart, safe and strategic energy decision for thousands of commercial, government, and residential clients throughout the United States. Additionally, having completed projects within National Grid’s territory, both behind-the-meter and directly tied to the grid, we feel confident we can successfully work with you to interconnect the proposed projects.

100% Energy Performance Guarantee: SolarCity’s 100% performance guarantee, included in our standard O&M agreement, insures National Grid’s expected solar production from the project. At the end of the five (5) year O&M term a production “true-up” measurement will be performed. If there is a shortfall between actual energy production and expected production for the five year period, SolarCity will financially reimburse National Grid.

Tesla Motors and Battery-Storage: SolarCity’s sister company, Tesla Motors, is the premier global electric vehicle company. Tesla has developed proven, operational, battery technology for the thousands of vehicles they have on the roads today. SolarCity is now leveraging this advanced R&D to extend battery storage offering to our clients. For some markets this will help reduce utility demand charges or provide temporary back-up power when the grid is

Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 721 of 859 Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 722 of 859 Contents

1. Bidder Information ...... 5 a. Form of Legal Entity and Year Established ...... 5 b. Location ...... 5 c. Changes in Ownership over Past 10 Years ...... 5 d. Outstanding Lawsuits and Disputes ...... 5 e. General Reputation and Performance Capabilities ...... 7 f. Number of Years Engaged in Providing Services ...... 7 g. Number of Employees ...... 7 h. Accreditations and Qualifications for Work ...... 8 i. Team Leader ...... 8 ii. Team Members ...... 8 iii. Licensing ...... 10 iv. Insurance ...... 10 i. Funding Source for Projects ...... 11 j. Audited Financial Statement...... 11 k. Pipeline of Contracted/Anticipated Solar Projects ...... 12 2. Experience and Project References ...... 13 a. Similar East Coast Projects for Roof-Mounted and Ground-Mounted PV ...... 13 b. Capability to Design, Engineer, and Construct PV Systems (60kW to 1MW) ...... 14 i. Production Modeling ...... 14 ii. Schematic Drawings and Design Criteria ...... 14 iii. Final Plan Set Drawings ...... 14 iv. Materials and Equipment ...... 14 c. Capability to Construct PV Systems (60kW to 1MW) ...... 15 i. SolarCity Management Practices ...... 15 ii. Experience with AHJs and Permitting ...... 15 iii. Experience with National Grid and Interconnection ...... 16 d. List of References from Previous Customers ...... 17 3. Construction and Commissioning ...... 26 a. Description of Each Proposed PV System ...... 26 i. Scope of Work ...... 28 ii. Features ...... 33 iii. Cut Sheets of Major Equipment to be Installed ...... 34 b. Energy Production Capacity Methodology used in Solar PV Array Info Sheet ...... 35 c. Proposed Site Preparation Work ...... 35 d. Testing and Commissioning for Each PV System ...... 35 e. Schedule for Engineering, Procurement, and Construction ...... 37 4. Operations and Maintenance (O&M) ...... 38 a. Capability and Cost to Provide the Required 5 Years of PV System O&M ...... 38 i. Qualifications and Experience of Regional Field Service Personnel ...... 38 ii. Operations and Maintenance Capabilities ...... 39 b. Location of Closest PV Service and Maintenance Professionals ...... 41 c. Sample O&M Manual ...... 42

Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 723 of 859 i. Inverter Tests and Inspections ...... 42 ii. Array Tests and Inspections ...... 43 5. Pricing Structure ...... 44 a. Price Proposal Form ...... 44 b. Proposed Discounts ...... 45 i. Clarifications and Assumptions ...... 45 6. Layouts ...... 46 7. Cut Sheets ...... 47 8. Signed Letters of Interest ...... 48

SolarCity (NASDAQ: SCTY) is a public corporation founded by Peter and Lyndon Rive in June 2006. Peter and Lyndon built SolarCity with the mission to help millions of homeowners and businesses adopt clean power, reduce energy costs, and protect their environment from polluting power sources.

SolarCity is a full-service provider of turnkey solar solutions. We offer in-house custom design, engineering, construction, financing, ongoing system monitoring, system operation and maintenance. As of December 31, 2013, we have more than 100,000 customers and have deployed over 567MW of solar energy projects. SolarCity has raised funds sufficient to finance more than $4 billion in solar projects and we service 15 states, DC, Puerto Rico and parts of Canada from our 40+ regional facilities.

SolarCity provides renewable energy at prices below utility rates to homeowners, school districts, government agencies, corporate clients, and large utility companies, including Hawaiian Electric Company, Kauai Island Utility Cooperative, and Lane Electric Cooperative. We look forward to the opportunity to provide clean, renewable Better Energy™ to National Grid.

a. Form of Legal Entity and Year Established

SolarCity Corporation Est. 2006

b. Location

3055 Clearview Way San Mateo, CA 94402

c. Changes in Ownership over Past 10 Years

In the past 10 years, SolarCity has transitioned from a privately-held to a public company. In April of 2012, we announced plans to conduct a registered initial public offering. At the end of 2012, the pricing of our initial public offering of 11,500,000 shares of common stock was $8.00 per share. The common stock is now traded on The NASDAQ Global Market under the ticker symbol “SCTY.”

d. Outstanding Lawsuits and Disputes

From time to time, we may be involved in litigation arising in the ordinary course of our business. The vast majority of such disputes do not involve material claims by or against the company. The following past and current litigation matters have been disclosed in SolarCity’s securities filings.

On April 30, 2013, the U.S. Department of Labor notified us that it was undertaking a wage and hour investigation related to employees located in our Foster City, California facility. We have cooperated and continue to cooperate in that investigation. In the course of that investigation, the Department of Labor subsequently asked us to provide information regarding certain of our employee positions throughout our organization for the three years preceding April 2013, and we provided that information in the fall of 2013. On February 28, 2014, the Department of Labor informed us that it had made a preliminary determination that some of our employee positions were not properly classified, but has made no assessment of damages or penalties. If the Department of Labor were to conclusively determine that we violated certain of these labor laws and regulations, we would be required to make the appropriate payments of back wages and other amounts to employees, and we might be subject to fines or penalties. We are undertaking a thorough review, and are engaged in further discussion with the Department of Labor. We intend to vigorously contest any determination by the Department of Labor that we are liable for back wages, fines, or penalties. We recorded a reserve in the quarter ended December 31, 2013 to account for any expected liability as a result of this investigation.

Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 725 of 859

On August 17, 2012, Kevin Demattio, a former outside sales employee, filed a putative class action complaint against SolarCity in the Superior Court for the County of Los Angeles (Civil Action No. BC490482). Mr. Demattio purports to represent a class of certain current and former outside sales representatives, and those with a similar title, who worked for us in California for the four-year period prior to the filing of the complaint. The complaint alleges causes of action for failure to pay proper wages due under various commission pay plans; failure to properly pay the wages of terminated (or resigned) employees; failure to provide proper itemized wage statements because of an alleged failure to specify requisite information; failure to keep accurate time records; and related claims for unfair competition and a California state statute permitting individuals to pursue claims not pursued by a state agency. Mr. Demattio seeks unspecified damages for himself and affected class members, including all wages due and owing, applicable statutory penalties (including waiting time penalties), interest, attorneys’ fees and costs. On January 24, 2013, we answered the complaint and asserted a cross complaint against Mr. Demattio to recover commissions that he was paid, but not entitled to, along with our fees and costs in the litigation. On March 14, 2014, Mr. Demattio filed a motion with the court to seek to pursue his action on behalf of a class. Also on March 14, 2014, we filed a motion for summary judgment on our cross complaint. Discovery has commenced, and we intend to defend ourselves against the complaint and pursue our own claims vigorously.

In July 2012, we and other companies with significant market share, and other companies related to the solar industry, received subpoenas from the U.S. Department of Treasury’s Office of the Inspector General to deliver certain documents in our respective possession. In particular, our subpoena requested, among other things, documents dated, created, revised or referred to since January 1, 2007 that relate to our applications for U.S. Treasury grants or communications with certain other solar development companies or certain firms that appraise solar energy property for U.S. Treasury grant application purposes. The Inspector General is working with the Civil Division of the U.S. Department of Justice to investigate the administration and implementation of the U.S. Treasury grant program, including possible misrepresentations concerning the fair market value of the solar power systems submitted for grant under that program made in grant applications by companies in the solar industry, including us. We intend to cooperate fully with the Inspector General and the Department of Justice. We are continuing to produce documents as requested by the Inspector General, and anticipate at least six months will be required to complete the gathering and production of such materials, and that the Inspector General will require at least another year to conclude its review of those materials. We are not aware of, and have not been made aware of, any specific allegations of misconduct or misrepresentation by us or our officers, directors or employees, and no such assertions have been made by the Inspector General or the Department of Justice.

On March 28, 2014, an individual plaintiff filed a putative class action, in the United States District Court for the Northern District of California, against the company, its CEO Lyndon Rive, and its CFO Bob Kelly, alleging violations of the federal securities laws in connection with the restatement of financial statements that the company had disclosed on March 2, 2014. At this time, no lead plaintiff has been designated, no class has been certified, discovery has not yet begun, and the Company is not yet required to respond to the complaint. The company is confident that the case has no merit, and intends to defend itself vigorously.

At the close of market on April 25, 2014, Bloomberg cited SolarCity’s market capitalization as$5.1 billion. According to GTM Research U.S. Solar Market Insight Q4 2013, no single player dominates the non-residential market, which includes commercial and government projects. SolarCity captured 8.4% of this market nationally in Q3 2013, according to GTM Research’s US PV Leaderboard report, up from 5.8% market share in Q2 2013. National estimates are based on an installed a capacity of 1,395MWDC between Q1 2012 and Q3 2013. GTM forecasted the non-residential market to grow to 397 MW in Q4 2013.

We have included the information below to show National Grid the growing volume of our customer base, solar installations and energy contracts.

Cumulative Cumulative Cumulative Megawatts Year End Megawatts Energy Customers Deployed Deployed Contracts 2013 92,998 280 567 83,265

2012 48,419 157 287 40,685

2011 19,509 72 130 14,129

2010 10,775 31 58 6,997

Our commercial designers are used to engineering a high volume of large-scale projects on multiple sites for commercial and government customers, such as cities and school districts. National Grid’s projects are well within the scope of our design and installation teams’ abilities.

Summary of PV Projects Completed in Northeast in Past 3 Years

Year Installed Type Size (kWDC) Count 2013 Roof Mount 31,739.19 3,863 2013 Ground Mount 8,004.685 29 2013 Total 39,743.875 3,892 2012 Roof Mount 9,906.66 1,346 2012 Roof Mount 201.35 12 2012 Ground Mount 98.7 2 2012 Solar Support Structures 151.2 1 2012 Total 10,357.91 1,361 2011 Roof Mount 2,367.8 355 2011 Ground Mount 304.21 10 2011 Roof Mount 30.36 3 2011 Total 2,702.37 368 3-year Northeast Total 71,205.183 7,056 f. Number of Years Engaged in Providing Services

7 years g. Number of Employees

Full-time Employees: over 5,000, as of March 31, 2014 Local (Mass) Employees: 103, as of December 31, 2013

SolarCity employs many solar industry veterans with extensive experience in the design, construction, and operation of rooftop, carport, and ground mounted solar arrays. Dan Leary, Senior Project Development Manager, will be the primary point of contact throughout the proposal phase of the project and will maintain a close involvement in the project throughout the implementation phase. Dan will report to John Conley, SolarCity’s Director of Project Development, who will provide senior management oversight throughout the entire lifecycle of the project.

i. Team Leader

Dan Leary, Team Leader

Senior Project Development Manager

SolarCity Corporation

(607) 592-7046

[email protected]

Dan Leary is a Senior Project Development Manager for SolarCity, responsible for sourcing and initiating commercial and industrial solar plant development projects in the tri-state area. Prior to joining SolarCity, Dan spent six years as a financial analyst and project developer with SunPower Corporation, including two years with PowerLight, which was acquired by SunPower in 2007. He successfully developed more than $125 million of solar projects in the Northeast and Mid-Atlantic states, including the nation’s largest net-metered rooftop solar installation, a 9-MW project at Holt Logistics in Gloucester City, N.J. Dan holds a Bachelor of Science from Cornell University and completed post graduate work in finance and accounting at The Wharton School of the University of Pennsylvania.

ii. Team Members

Our system design team will consist of senior design staff including Sharon Greenberg and Leo Wu, who are listed below, as well as several additional Designers. SolarCity is dedicating high-level Operations professionals for National Grid’s projects. There is a transitional period between the development and implementation phases, wherein the project will be primarily transferred to Elie Schecter, the Project Manager. The install team will likely consist of Commercial Project Manager Elie Schecter and our local employee installers. Elie and Jason Quinlan will be managing the day-to-day of installation and will meet with National Grid regularly to provide progress updates. Additionally, Lee Keshishian, Regional VP for the Northeast, will provide executive oversight of the projects throughout the design, construction, and operations phase. After the system is completely installed, passed inspection, and interconnected, the Systems Maintenance and Reliability teams, under Jimmy Bergeron’s direction, will track system production and address any issues in accordance with warranty and O&M contract obligations.

The summary table reflects National Grid’s project team and how each team member collaborates on commercial projects. We are hopeful that National Grid will see value in working with such an experienced project team as SolarCity’s and in having senior level operations team members dedicated to this project. In addition, previous experience and qualifications of SolarCity’s project team is summarized below.

Name Title Project Role Prior Experience Credentials

SolarCity Corporation Design, permitting, financing, interconnection applications, ongoing system maintenance and operations Developed more than $125 million B Science from Cornell of solar projects in the Northeast University; Post graduate Senior Project and Mid-Atlantic states, including Team leader work in finance and Dan Leary Development the nation’s largest net-metered Main point of contact accounting at The Wharton Manager rooftop solar installation, a 9-MW School of the University of project at Holt Logistics in Pennsylvania Gloucester City, N.J 6 years of solar development and BA from Dartmouth College; Director, Project High level customer closure of more than 50MWs Master’s Degree from John Conley Development satisfaction and contract ($250 million) of operating solar Fletcher School of Law and East navigation PV projects Diplomacy at Tufts University Senior 5 years of experience in system Commercial design, pricing, and technical BS in Electrical Engineering, Paul Morini Initial system design Sales Engineer, support for commercial PV NABCEP-certified installer East Coast opportunities Senior Director President of NY SEIA and of Policy and Renewable energy market 2.5 years of critical solar policy Shaun Chapman chair of SEIA’s New Jersey Electricity analysis wins in CT, MA, NY committee Markets Managed the design and Director of Oversees Engineering and installation process for a 21MW Mechanical Engineer and Sharon Greenberg Engineering Design Teams rooftop portfolio with Southern MBA California Edison

Senior PV Designed over 200 commercial PV Electrical Engineer (P.E.), Leo Wu Electrical engineering Design Engineer systems LEED certified

Regional Vice Regional VP oversight of Oversaw more than 10MW of BA, Georgetown University; Leon Keshishian President, project schedule, safety, and installations across the Northeast Thunderbird School of Global Northeast ongoing operations in 2012 Management Overall project implementation Commercial including design timelines, Managed over 4MW of Rob Miller NABCEP-certified installer Project Manager safety, construction execution, commercial solar installations and Project Schedule NABCEP-certified installer, Responsible for project Been in solar for 4 years and has Construction Supervisor, Construction Jason Quinlan quality, safety, cost, and built over 4MW of systems across Hoisting Engineer, Manager schedule. the Northeast Hydraulics License, OSHA 10+ and 30 Senior Director Designed and implemented the of Environmental Safety Plan review and issue Carlos Ramirez solar fall-rescue device and OSHA-certified trainer Health and mitigation as necessary system Safety Principle on-site PM for 92 solar Director, Oversees all maintenance and NABCEP-certified installer, installations at Walmart retail Jimmy Bergeron Systems operations for installed commercial and industrial stores, constructed over 150 Maintenance systems electrician commercial projects 4 years in solar leading teams B.S.E in Electrical Director of Grid Oversees solar energy data responsible for developing Engineering, Magna Cum Eric Carlson Systems collection and battery storage balance-of-system products and Laude graduate of Princeton Integration deployment conducting PV performance University modeling and analysis Senior Director, Utility interconnection Asset Successful interconnection with Master of Business in Fiona Taylor agreements, rebate Management nearly 300 utilities nationally Financial Law applications Group Tuck School of Business Director of Solar energy development of large (Dartmouth); AB, Wilson Sources tax equity capital for West Owens Structured commercial projects for national School of Domestic and solar development funds Finance accounts in the U.S. International Affairs (Princeton University)

SolarCity possess the following Contractor’s Licenses within the state of Massachusetts.

Summary Table of Licenses

State License Classification Number

Massachusetts Home Improvement Contractor HIC 168572

Massachusetts Master Electrician MA MR 1136

Massachusetts Certificate of Good Standing 12046913840

Engineering Name of Holder Number

Electrical Leo Wu 19161

Civil Amir Massoumi 50555 iv. Insurance

SolarCity can provide National Grid with proof of our ability to purchase and maintain insurance over the term of the contract.

Summary Table of Insurance Coverage

Coverage Amount Each Occurrence Limit - $1,000,000 Personal and Advertising Injury Limit - $1,000,000 General Aggregate Limit - $2,000,000 Commercial General Liability Products-Completed Operations Aggregate Limit - $2,000,000 Total limits required may be satisfied with an umbrella or excess liability policy. This insurance shall name the Town as additional insured. Liability (any auto) - $1,000,000 Commercial Automobile Uninsured/Under Insured Motorists - $1,000,000 Covering errors and omissions Each Claim - $5,000,000 Professional Liability Insurance Aggregate Limit - $5,000,000 This insurance can be written on a claims-made basis. Bodily Injury by Accident - $1,000,000 each accident Workers Compensation and Bodily Injury by Disease - $1,000,000 policy limit Employers Liability Bodily Injury By Disease - $1,000,000 each employee Deductible - $150,000 per claim Each Occurrence - $25,000,000 Umbrella Liability General Aggregate - $25,000,000

As a publicly traded entity (NASDAQ: SCTY), SolarCity is a financially robust corporation with long-lasting fiscal resources. We will be funding the National Grid projects internally with our own cash flow. Through our PPA and lease options, we establish multi-year contracts that provide SolarCity a long term revenue stream. Similar to a traditional power utility business model, this revenue stream is highly reliable and continues to grow as our customer base increases. Unlike solar module manufacturers, who must divest their ownership in projects in order to recognize the module revenue, SolarCity’s business model is predicated upon receiving these 20+ years of predictable income. This diverse portfolio of projects provides a reliable cash flow that allows SolarCity to continue raising additional capital to support our long term growth. Below we have included some of the highlights from our Q4 Earnings Presentation given on February 24, 2014 that outline our capital position coming into 2014. As you can see, we have tremendous access to capital as we scale our business:

Also, in early April 2014, we announced the pricing of our second securitization. In order to achieve this scale, SolarCity’s balance sheet has been underwritten by several of the largest financial institutions in the world, and based on our excellent project execution we continue to receive follow on investments from our marquee financing partners. j. Audited Financial Statement

Per SEC regulations, SolarCity is required to regularly release relevant financial and operating information. To view SolarCity’s audited financial statements, please visit our most recent S-1 filing here:

http://investors.solarcity.com/secfiling.cfm?filingID=1193125-14-104447&CIK=1408356

It is important to note that SolarCity retains an ownership interest in the solar power systems that we finance. As such, our financial statements reflect the revenue earned from the 20 year recurring revenue streams associated with this large pool of financed systems. We incur the costs associated with constructing these solar systems prior to system deployment and the aggregate cost of these systems are presented in our consolidated balance sheet as leased solar energy systems. These costs are depreciated over the estimated life of the solar systems. SolarCity has complex financial statements due to the different financing structures it deploys to finance the construction of

SolarCity cannot disclose this information as it is material to the health of our business and is non-public information at this time. For Q1 2014, we expect MW deployed of between 78 MW - 82 MW, up 74% year-over-year at the midpoint and consistent with our targets for the year. For 2014, we reaffirm guidance for MW deployed of between 475 MW and 525 MW.

SolarCity has developed more than 23 MW of commercial and government projects in the Northeast as of December 31, 2013. Many of these projects were deployed over several sites, which is a testament to SolarCity’s ability to effectively manage a portfolio of projects for one customer. A sample of these completed projects is listed below:

Select SolarCity Projects in the Northeast

Project Name Project Size Project Location Project Type

Walmart sites 10,299.78 MD, NY, OH Roof Mount

Town of East Bridgewater 2,446.08 MA Ground Mount

Queen Anne’s County 2,365.44 MD Ground Mount

South Central Connecticut Regional Water Authority 1,053 CT Ground Mount

Town of Centreville 900.48 MD Ground Mount

City of New Haven 720.54 CT Roof Mount

Ground and Roof Town of Glastonbury 613.15 CT Mount

Delaware City 500.57 DE Ground Mount

Town of Windsor 443.04 CT Roof Mount

BJ’s Wholesale Club 399.36 NJ Roof Mount

GAL Manufacturing 237.12 NY Roof Mount

Manheim Remarketing (Cox Enterprises Inc.) 227.5 NY Roof Mount

Ruppert Landscape Companies 227.24 MD Ground Mount

i. Production Modeling

SolarCity used PV Syst for the production modeling of all National Grid’s projects.

PV Syst is the kWh production estimate program that was used to produce the 8760 data and evaluate solar electricity generation for the site. PV Syst is the industry standard for solar production estimation. This program allows users to customize the characteristics of each solar array simulation, such as azimuth, tilt, specific module characteristics, string level characteristics, MPP tracking characteristics (inverter), weather highs and lows, voltage losses, and array soiling among others.

ii. Schematic Drawings and Design Criteria

We will engage with National Grid to verify the acceptability of all designs prior to construction. Based on information obtained during the Site Audit, SolarCity’s Design Team will draft Schematic Design drawings for each project site, which will include the following design criteria:

Layout of the systems Shading analysis Electrical single-line diagrams Location of electrical equipment Interconnection methodology Geological or structural conditions Equipment lists and cut sheets

iii. Final Plan Set Drawings

Once a system is designed, it is reviewed internally and then reviewed by an external professional engineer. These drawings should represent nearly 100% of the intended scope and design for National Grid’s projects. All systems are installed compliant with national codes and local ordinances.

Signed and stamped by a Professional Engineer of Record Provided to the Authority Having Jurisdiction (AHJ) NEC compliance Life-safety issues Verification of the design assumptions made in the electrical and structural calculations Determination of the appropriate equipment Elevations and cross sections of structural, geotechnical, and electrical designs Finalization of structural calculations Providing rack and module connection details (when necessary)

iv. Materials and Equipment

SolarCity does not merely purchase the cheapest panels on the market without assessing their true value to the customer or our company. We have a well-developed process by which we ascertain the quality of the products available on the market.

All materials and equipment incorporated will be new and suitable for the use intended.

i. SolarCity Management Practices

The following matrix illustrates SolarCity’s approach to designating project tasks with regards to SolarCity’s responsibilities and subcontractor’s responsibilities for any given project. In all cases, SolarCity takes sole responsibility for tasks such as financial analysis, site audits, project management and construction management.

SolarCity typically works with our subcontractors for tasks such as site preparation, waterproofing, and specialized concrete and trenching. For tasks such as system engineering, racking construction and module installation, SolarCity shares responsibility with subcontractors after a dialogue occurs between the stakeholders involved. However, for all of the responsibilities detailed below, SolarCity is in the position of sole manager. Please see the matrix below for a clearer view of how SolarCity approaches managing each and every project.

Task Description In-House Managed by SolarCity Financial Analysis X Utility and Rebate Submissions X Site Audit X System Design X System Engineering X X Project Management X Construction Management X X Site Preparation X Racking Construction X X Waterproofing (if roof system) X X Module Installation X X Conduit Installation and Wiring X Inverter Installation X Specialized Concrete Work X Specialized trenching, boring X Concrete and asphalt patching X Inspections and Testing X X Commissioning X X On-going maintenance X X Remote monitoring and quality assurance X X Materials / Procurement X X Site Safety X Equipment Rental X Permitting X Environmental Issues X Interconnection X

ii. Experience with AHJs and Permitting

SolarCity has acquired photovoltaic permits in over 2,700 cities and countries, as of December 31, 2013. Our service territory spans the entire United States from the East Coast to Hawai’i, and as we continue to expand our territory, our knowledge of and experience with many more AHJs expands in tandem. A key component of our ability

SolarCity plan-sets are often complimented by plan checkers as examples of the best in the business. The City of Santa Clara held a meeting on over-the-counter permitting for PV and used our drawings to illustrate what a complete and clear plan set looks like. An inspector in the City of Bend told one of our designers, “Of all the plans from solar contractors I’ve seen, yours are by far the cleanest and easiest to follow.”

iii. Experience with National Grid and Interconnection

As solar module prices have dropped over the past few years, “soft” costs, such as local permitting, represent the impact local governments have on the cost of solar PV. Today, more than 18,000 municipalities set their own permitting requirements for solar energy systems1, which results in varying permitting requirements city by city. Long waits, high fees, excessive inspections, avoidable paperwork and non-standard practices across different jurisdictions can all add unnecessary costs to what should be a simple, transparent process. Approximately 46% of SolarCity's 1,449 installations in Massachusetts are interconnected with National Grid, as of December 31, 2013. SolarCity's experience here can help with local utility applications and approval processees.

Image 1: This satellite image shows SolarCity’s installations across Massachusetts. The yellow markers indicate projects that are interconnected with NStar.

1 Jackson, R. (2013). "Project Permit: Cutting Red Tape for Green Energy". RenewableEnergyWorld.com

We have provided summary table below of customer and project references for National Grid’s benefit in evaluating SolarCity’s experience and credentials. If there is any trouble reaching one of the references, please contact Dan Leary as he will be able to help facilitate an introduction on behalf of National Grid. The contact information is sensitive; please use with discretion.

Project Size Project Name Project Location (kWDC) Town of East Bridgewater East Bridgewater, MA 2,446.08

City of New Haven New Haven, CT 820

Town of Glastonbury Glastonbury, CT 1,074

Queen Anne’s County Centreville, MD 2,370

Town of Centreville Centreville, MD 1,000

SUNY Cortland College Cortland, NY 1,063

Kauai Island Utility Cooperative Kauai, Hawaii 14,221.94

Cox Enterprises Inc. New York 227.5

Town of East Bridgewater, MA Completed in June 2013 Ground Mount | 2.446MW

George Samia (508) 378-1601, [email protected] “We have been pleased with our installation and recommend SolarCity’s clean energy services. The town of East Bridgewater was approached by several companies with offers of similar projects. It was felt by East Bridgewater Administration as well as legal counsel that SolarCity had the most workable give and take formula amidst the lot.”

Giovanni Zinn, P.E. (203) 946-8101, [email protected] “The new solar panels would solidify New Haven’s position as a leader and innovator in renewable energy systems. It’s a great opportunity. It saves money and it saves the environment, which is what we’re looking for.”

Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 739 of 859

Town of Glastonbury, CT 3 sites complete; 4 sites under design Ground Mount, Carport, and Roof Mount | 1.074MW

David Sacchitella (860) 652-7706, [email protected] “SolarCity has been an excellent partner for the Town of Glastonbury’s solar projects. […] Their projects were completed on time and with minimal impact to the Town. We highly recommend them as a partner for solar installation and project financing.”

Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 740 of 859

Town of Centreville, MD Completed in November 2013 Ground Mount | 1.00MW across 2 sites

Steve Walls (410) 758-1180, [email protected] “As Thomas Edison once said, ‘I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that. Now, 59 years later, I’m proud to see Centreville activating two solar arrays at Waste Water Spray Irrigation Facility.” -- George "Smokey" Sigler, Centreville Council President

Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 741 of 859

South Central Connecticut Regional Water Authority Hamden, CT Completed in December 2013 Ground Mount | 1.053MW

Jim Flynn (203) 401-2560, [email protected] “This solar photovoltaic system, one of the largest of its kind in Connecticut, will allow the Authority to be more efficient and lower our energy costs. These savings are passed on to our customers in the form of reduced rate increases” – Larry L. Bingaman, Regional Water Authority President and CEO

Matthew J. Brubaker, AIA LEED-AP (607) 753-2272, [email protected] Campus Energy Manager

Brad Rockwell (808) 246-4300 [email protected]

Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 744 of 859 Cox Enterprises Inc (Manheim Remarketing) Clifton Park and Newburgh, NY | Kenly, NC | Oceanside, CA Installation Roof and Ground Mount | 1.58 MW

Eric Holder (770) 296-5524 [email protected] Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 745 of 859 3. Construction and Commissioning a. Description of Each Proposed PV System

The chart below summarizes the high-quality products (modules, inverters, racking system, and DAS) chosen by SolarCity that are approved by authorities and in full compliance with IBC requirements. All suppliers for SolarCity projects have been vetted through our engineering quality and investor standards. At the time of construction, SolarCity will evaluate all technologies on the market and will choose a functionally equivalent supplier if any concerns arise with manufacturers listed below.

Trina Solar – Module Supplier Trina Solar is a leading global provider of solar solutions and has installed over 4.8 GW worldwide. Their solar panels are designed and manufactured to the highest quality standards. Their products have proven themselves on the field and in 3rd party testing against other leading manufacturers. Through their 25 year linear power warranty, they guarantee panel output will not decrease by more than 2.5% the first year and 0.7% for each year thereafter.

Solectria Renewables – Inverter Supplier Solectria Renewables, LLC was established in January 2005 with corporate offices (including manufacturing, design) in Lawrence, MA. Solectria Renewables “spun off” from Solectria Corporation (an electric and hybrid vehicle company) as a separate company to focus solely on the development and sales of grid-tied PV inverters. Today, Solectria Renewables, LLC is the leading U.S. based grid-tied PV inverter, string combiner and web-based monitoring manufacturer for residential, commercial and utility-scale solar projects. Solectria Renewables is backed by over 20 years of power electronics and inverter experience and world class warranties. All of their commercial and utility-scale PV inverters are manufactured in the USA, ARRA compliant, Ontario FIT Content Compliant, and listed to UL 1741/IEEE 1547. Solectria Renewables’ primary customers include Engineering Procurement Contractors (EPCs), solar developers, Real Estate developers, Electrical distributors and contractors, and Solar Financing companies with solar installations in North America.

SMA America – Inverter Supplier SMA Solar Technology AG is the global leader in the development, production and sales of photovoltaic (PV) inverters. As an energy management group, it offers innovative key technologies for future power supply structures. SMA is represented in all important PV markets, including 21 countries on four continents. The company has a staff of more than 5,000 and reached a sales volume of EUR 1.5 billion in 2012. SMA has received numerous awards for its product solutions and exceptional corporate culture. In 2011 and 2012, the company earned first place in the German “Great Place to Work®” competition among companies with more than 5,000 employees.

DECK Monitoring – Monitoring Supplier In October of 2013, AlsoEnergy acquired DECK Monitoring, becoming the largest independent PV monitoring provider in North America. AlsoEnergy monitors more than 7,000 solar power project sites across the U.S., the Americas, Europe, Asia, and Australia. AlsoEnergy was founded in 2006 by Robert Schaefer and Holden Caine, both with a background in hardware and software integration, who felt there was a need to build real-time software solutions that integrate renewable energy system performance data with financial management.

Summary Table of Design and Equipment

Installed Site Address Proposed Technology Capacity (kWDC) Trina Solar TSM-300PD14 2 Executive Place 1 Solectria Renewables SGI225kW (480) 557.7 Andover, MA Ground Mount Trina Solar TSM-300PD14 Groton School Rd 2 Solectria Renewables SGI500kW (480) 999.9 Ayer, MA Ground Mount Trina Solar TSM-300PD14 Carpenter Hill Rd 3 Solectria Renewables SGI500kW (480) 999.9 Charlton, MA Ground Mount Trina Solar TSM-300PD14 454 Essex Ave 4 Solectria Renewables SGI500kW (480) 927.3 Gloucester, MA Ground Mount Trina Solar TSM-300PD14 18 Crafts Rd 5 Solectria Renewables SGI225kW (480) 541.2 Gloucester, MA Ground Mount Trina Solar TSM-300PD14 Stafford Street 6 Solectria Renewables SGI225kW (480) 541.2 Leicester, MA Ground Mount Trina Solar TSM-300PD14 Douglas Road 7 Solectria Renewables SGI500kW (480) 940.5 Northbridge, MA Ground Mount Trina Solar TSM-300PD14 Benjamin Rd 8 Solectria Renewables SGI500kW (480) 999.9 Shirley, MA Ground Mount Trina Solar TSM-300PD14 Kittridge Road 9 Solectria Renewables SGI500kW (480) 999.9 Shirley, MA Ground Mount Trina Solar TSM-300PD14 183 Sumner St 10 Solectria Renewables SGI225kW (480) 524.7 Stoughton, MA Ground Mount Trina Solar TSM-300PD14 698 Main Street 11 Solectria Renewables SGI500XT (208) 999.9 Sturbridge, MA Ground Mount Trina Solar TSM-250PA05 87 West Street 12 SMA Tripower 91.25 Attleboro, MA Mixed Trina Solar TSM-250PA05 100 East Ashland Street 13 SMA Tripower 68.25 Brockton, MA Roof Mount Trina Solar TSM-250PA05 161 Mulberry Street 14 SMA Tripower 256.75 Brockton, MA Roof Mount Trina Solar TSM-250PA05 82 Florence Street 15 SMA Tripower 62.25 Marlborough, MA Roof Mount Trina Solar TSM-250PA05 310-400 Rhode Island Ave 16 SMA Tripower 614.25 Fall River, MA Roof Mount

i. Scope of Work

SolarCity reserves the right to decline any site awards under this RFP. SolarCity is proposing the installation of a fully operational, grid interconnected PV solar power systems including materials, labor and administrative support. SolarCity and its designated representatives will perform all activities directly related to the installation of the PV solar power system as noted in the following statement of work. All other activity is considered out of scope unless explicitly called out in writing by SolarCity.

1. Labor: SolarCity has included standard labor wages for all projects (on National Grid property and privately owned property). For the Town of Shirley union labor wages are assumed. 2. Site Preparation: The array area will be prepared to accept the construction of the system. a. Ground Mount Systems i. Grading and compaction of soils to specification of racking manufacturer as required ii. Tree and brush removal in array area iii. Removal of non-hazardous excavation spoils iv. Storm Water management plan, hydrology report, erosion plan as required v. Soils testing vi. Site survey vii. Scan for existing utilities (USA, Digalert or equivalent) viii. Allowances included for site preparation with final cost to be determined by Civil Engineering report for each site b. Roof i. Inspection by roofing material manufacturer if required to maintain existing warranty ii. Structural analysis of the roof 3. Temporary Facilities: Temporary facilities may be placed on site as needed for the duration of the project and will be removed in a timely manner after project completion. The following facilities may be placed on site in a location mutually agreed upon by SolarCity and the customer.

Dan Leary | Project Development Manager | (607) 592-7046 | [email protected] SolarCity | 24 St. Martin Drive, Building 2, Suite 11, Marlborough, MA 01752 | www.solarcity.com MA HIC#168572; MA MR1136; DCAM 2906 Page 28 of 49 Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 748 of 859 a. Temporary workspace for the use of SolarCity employees and contractors b. Toilet facilities for field staff c. Storage containers d. Scaffolding e. Heavy equipment including but not limited to forklifts, cranes, boom lifts, front end loaders, generators, trucks etc. f. Water facilities g. Lay down areas for oversized materials h. 120V power source (provided by customer) i. Temporary chain link fence around staging areas (bare wire, 6’ or greater per SolarCity specification) 4. Safety Equipment: Appropriate safety measures will be applied in accordance with OSHA requirements. 5. PV Solar System Installation: Installation of a fully functional PV Solar power system to include: a. Building permits and support for interconnection application. b. Mounting System i. Ground Mount structure installation 1. Installation of foundations per SolarCity design, including but not limited to screws, driven piers, concrete piers. 2. Installation of racking system 3. Spoils will be spread evenly over the site or disposed of. ii. Roof installation 1. Placement of racking 2. Protection of roof integrity as required 3. Physical attachment to roof structure per SolarCity design requirements. 4. Flashing of all penetrations 5. Inspections and installation procedures will be performed in accordance with roofing industry best practices c. AC Wiring and interconnection to be performed per NEC code, local jurisdiction rules and SolarCity specifications as noted in construction drawings. i. Installation of AC wire and conduit. Conduit to be located on the exterior of buildings as required. ii. Interconnection of AC equipment to electrical service. iii. Interconnection of PV system to utility grid. iv. Installation and wiring of required AC disconnecting means v. Installation of convenience outlets within 15’ of each inverter vi. An allowance for Utility transformer, service and switchgear upgrades required to accommodate PV solar power system interconnection has been included with the final value to be determined by Utility Impact study for each site. d. DC wiring to be performed per NEC code, local jurisdiction rules and SolarCity design specifications as noted in construction drawings. i. Module to module, combiner, home run, and recombiner DC conduit and wiring ii. Grounding of electrical components iii. Installation and wiring of required DC disconnecting means e. Inverter installation i. Installation of inverter foundation or wall mount as required. Foundations poured to SolarCity and AHJ specifications. ii. Wiring and testing of inverter per manufacturer specifications f. Monitoring hardware i. Installation of monitoring gateway and CTs

Dan Leary | Project Development Manager | (607) 592-7046 | [email protected] SolarCity | 24 St. Martin Drive, Building 2, Suite 11, Marlborough, MA 01752 | www.solarcity.com MA HIC#168572; MA MR1136; DCAM 2906 Page 29 of 49 Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 749 of 859 ii. Physical connection of monitoring hardware to network (Internet and network access per monitoring system requirements, wired network connection point and AC power source provided by customer within 50’ of monitoring hardware.) g. System commissioning i. Electrical 1. Inspection and testing of AC electrical continuity, operating voltage, amperage and phasing 2. Inspection and testing of DC electrical continuity, voltage and polarity 3. Inspection and testing of system and component grounding 4. Inspection of wire strain relief and wire management 5. Verify torque connection tightness 6. Verify inverter function ii. Construction 1. Verify correct installation of safety placards 2. Verify component installation vs. design documents 3. Verify condition and proper installation of PV modules 6. Work hours: All proposals, pricing and construction schedules are based on standard work hours of Monday – Friday 5:00 AM to 7:00 PM unless explicitly stated otherwise in writing by SolarCity. SolarCity reserves the right to work outside of the standard work hours at its sole discretion. Work hours will be adjusted to comply with local ordinances. 7. Site Access: SolarCity will have unrestricted access to the construction area. Additional costs incurred by project phasing are considered to be out of scope unless explicitly stated in writing by SolarCity. 8. Trenching/Boring a. Underground conduit and conductor banks will be installed per minimum guidelines set forth in NEC code and SolarCity design specifications. b. Concrete and asphalt removed by cutting or excavation will be replaced. c. Landscaping directly impacted by excavation activity will be restored. (Does not include Relocation of landscaping and vegetation outside the excavation area.) 9. Materials: All materials will be provided in accordance with SolarCity’s approved design. Materials will be new and specifications will be to SolarCity design standards. Materials will meet NEC code and local AHJ requirements. Supplied materials may include: a. PV Solar Modules b. Inverter and inverter mounting hardware c. Racking System d. Racking foundations e. Solar Support structures f. Conduit g. Paint h. Wire i. Combiner boxes j. Fuses k. Disconnecting means l. Transformers m. Monitoring equipment (data wire and internet connectivity provided by customer) 10. Job documentation a. As built drawings will be provided in the form of marked up construction drawings.

1. Bonds: Payment and Performance Bonds are excluded from proposed pricing. 2. Design Changes a. Relocation of arrays due to unforeseen above or below ground site conditions b. Customer modification of approved design c. Modification of design to accommodate AHJ requirements 3. Hazardous Materials a. Removal/Disposal of hazardous materials and soils b. Testing of spoils for hazardous substances c. Asbestos handling and abatement 4. Electrical a. Lighting i. New lighting circuit installation ii. Installation of lighting beyond the solar array area iii. Maintenance of carport lighting iv. Luminance levels in excess of minimum IESNA standards b. Interconnection i. Interconnection at a location other than that specified in SolarCity’s proposal or approved design ii. Interconnection voltages other than those specified in SolarCity’s proposal or approved design iii. System Control and Data Acquisition (SCADA) equipment other than that specified in SolarCity’s proposal or approved design iv. Aesthetic covering of conduit and wire v. Rigid conduit where not required for NEC code compliance 5. Ground, Concrete, Asphalt a. Spread footings or other footing modifications to accommodate unforeseen adverse soil conditions for solar support structure foundations b. Infrastructure upgrades triggered by construction activity on the site c. Concrete slurry in low voltage trenches d. Removal of existing light post footings and light posts outside of array area e. Removal of light post bases in array area f. Excavation of rock and adverse soil conditions g. Habitat mitigation h. Environmental studies i. Re sealing of asphalt j. Cosmetic treatment of asphalt or concrete to match existing k. Restriping of parking areas l. Bollards, abutments and or curbs not specified in the approved design m. Civil engineering and construction for traffic flow modifications n. Temporary fencing around construction area. o. Sound control fencing. 6. Inspections a. DSA inspector fees b. 3rd party materials testing and verification

Battery Technology Overview SolarCity has been working with Tesla Motors for multiple years to develop reliable and innovative stationary storage products. These solutions are all based on lithium ion battery technology, which is the same technology as that of computers and cell phones. The difference with SolarCity’s solution is that the “stand alone storage” batteries are packaged in much larger units and intended to provide large amounts of energy for up to 2 hours (or more depending on the configuration).

The below photo to the left provides an image of the Tesla 200kW / 400kWh battery unit. This is the primary building block for our commercial, industrial, and utility scale battery projects. As you can see, the battery resembles a transformer and comes pre-packaged and delivered to the site as a “skid”. These 200kW / 400kWh skids are a modular building block that can be wired together to obtain many MWh of aggregate storage potential.

National Grid Battery Opportunities SolarCity would strongly encourage National Grid to consider the value of installing a battery system in conjunction with one or more of the proposed PV systems under this RFP. As we understand, National Grid faces transmission congestion at various times throughout the day, including during the late afternoon hours when PV system production begins dropping. By installing a battery in conjunction with the PV system, National Grid will be able to store the PV generation and thus shift the production curve to the later afternoon / evening hours. Obviously there are many technical and financial considerations to arrive at the optimal solution, but ultimately the usage of a battery portfolio will allow National Grid to expand the scope of the load reduction addressed by solar PV. SolarCity is an industry leader in providing generation shifting solutions via solar / battery systems and with feedback on the ideal application we can provide detailed models to demonstrate this value to National Grid.

Investment Tax Credit for Batteries The IRS has recently provided guidance that any battery system that is installed in conjunction with a PV system is eligible for the 30% Federal Investment Tax Credit. In order to be eligible, the PV / battery system must be a cohesive unit, and the battery must be charged by a minimum of 75% from solar PV. As the proposed system owner of the PV systems, the associated ITC would accrue to National Grid, as would the ITC associated with the battery. In this manner, National Grid can extract additional value for the battery system that would not otherwise be available if the battery were not installed with, and charged by, a solar PV system.

Combined PV / battery systems are economically feasible today at the commercial scale Our battery technology is based on Tesla Motors lithium ion solution – a proven solution PV generation curves are intermittent and will “ramp down” during the late afternoon Battery systems can store this PV generation and dis-charge during evening peak The battery systems can be used to firm up the PV generation throughout the daytime Battery systems are eligible for ITC so long as they are installed in conjunction with a PV system

The pricing for battery projects is site specific depending on the required application of the battery (run time, discharge timeframe, etc.) SolarCity welcomes the opportunity to provide specific feedback on battery opportunities if National Grid is interested. Based on your feedback we can provide questions that will help us to develop the most relevant and valuable proposal.

iii. Cut Sheets of Major Equipment to be Installed

We have provided cut sheets at the end of this document and uploaded to Ariba under item 15.1.

SolarCity will handle all aspects of preparing the site to make it acceptable for construction. Allowances for site preparation have been included in our price and are specifically identified in “Attachment 2”. The final cost is to be determined upon site survey and engineering.

Our standard scope of work for ground mounted systems may include the following: ▪ Grading and compaction of soils to specification of racking manufacturer, as required ▪ Tree and brush removal in array area and adjacent shading regions ▪ Removal of non-hazardous excavation spoils ▪ Storm water management plan ▪ Hydrology report ▪ Erosion plan, as required ▪ Soils testing ▪ Site survey ▪ Scan for existing utilities

For rooftop system our scope includes ▪ Inspection by roofing material manufacturer prior to installation ▪ Structural analysis of the roof

We have also included cost allowances in “Attachment 2” for the interconnection of each system to National Grid’s distribution service. Final costs will be adjusted based up on National Grid’s interconnection impact study results. d. Testing and Commissioning for Each PV System

As a benefit to National Grid, SolarCity has taken great strides to improve quality control and accountability with system commissioning. Prior to system commissioning, the PM and CM are responsible for the proper installation and providing documentation evidencing that the commissioning tasks set forth below have been completed. This step ensures that expectations for successful project completion are clearly defined. The system acceptance procedure includes aesthetic review of structural components, the creation of as-built drawings as well as a third- party commissioning process. SolarCity has partnered with True South Renewables for independent commissioning of our large commercial projects.

True South is a nationwide company and the largest exclusive solar O&M service provider in North America. For all commercial PV systems with capacities between 50kW and 10MW, True South will perform a rigorous system acceptance procedure prior to the full operation of the PV system. True South will be responsible for all site safety and will ensure that a competent person is present during this work. They will conduct commissioning of the system and deliver a commissioning report to SolarCity within 5 business days of visiting the job site. True South will identify any construction flaws, defect, poor workmanship or substantial deviations from plans or applicable codes. All non-conformances found shall be corrected at SolarCity or our subcontractors’ expense.

The System Commissioning Agent shall verify that the Systems are installed mechanically and electrically correct, and in accordance with the Drawings, manufacturer specifications, applicable building and NEC codes and AHJ requirements. Scope of System Commissioning

Task Task Description

Verify that the solar support structure was constructed properly and installed in accordance with the Mechanical plans, manufacturer specifications and Prudent Industry Practices.

Verify that all electrical equipment, wiring, conduits and other related components were constructed Electrical properly and installed in accordance with the plans, manufacturer specifications and Prudent Industry Practices.

The System Commissioning Agent will provide a report with the results of the Commissioning performed on each of the Systems in accordance with a Commissioning Report template. The Commissioning Report will include all the information, photos, and data collected by the System Reporting Commissioning Agent as part of the Commissioning, as well as a list of all non-conformances found during commissioning. Any corrective action required by the Seller to correct such non- conformances must be verified and documented by the Systems Commissioning Agent in a subsequent addendum to the Commissioning Report.

As part of our response to National Grid, we are providing high level schedules for 1MW ground mounts and 300kW roof mounts. These schedules can be found on the following pages.

2 Project Award 0 days Wed 7/9/14 Wed 7/9/14 7/9

3 Contracts Signed 0 days Fri 8/8/14 Fri 8/8/14 8/8

4 Solar City Internal Job Prep 10 days Mon 8/11/14 Fri 8/22/14

5 Structural, Electrical & Engineering Design & 30 days Mon 8/25/14 Fri 10/3/14 Design,Engineering & approval Permit

6 Materials Procurement 20 days Mon 9/8/14 Fri 10/3/14

7 On Site Construction Prep 10 days Mon 9/29/14 Fri 10/10/14

8 Land Clearing/Site Work 15 days Thu 10/2/14 Wed 10/22/14

9 Construction 35 days Thu 10/23/14 Wed 12/10/14 Construction

10 System Interconnection 12 days Thu 12/11/14 Fri 12/26/14 Interconnectio

11 Project Completion 10 days Mon 12/29/14 Fri 1/9/15

Task External Milestone Manual Summary Rollup Split Inactive Task Manual Summary Milestone Inactive Milestone Start-only Date: Mon 5/5/14 Summary Inactive Summary Finish-only Project Summary Manual Task Progress External Tasks Duration-only Deadline

SolarCity 3055 Clearview Way Draft copy: NOT APPROVED FOR CONSTRUCTION San Mateo, CA 94402 Page 1 Massachusetts Electric Company Nantucket Electric Company d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted PV Array Preliminary Schedule Page 758 of 859 ID Task Name Duration Start Finish Jul '14 Aug '14 Sep '14 Oct '14 Nov '14 Dec '14 Jan '15 F 29 6 13 20 27 3 10 17 24 31 7 14 21 28 5 12 19 26 2 9 16 23 30 7 14 21 28 4 11 18 25 1 1 300kW Sample Rooftop Solar System 110 days Wed 7/9/14 Tue 12/9/14 Project Duration

2 Project Award 0 days Wed 7/9/14 Wed 7/9/14 7/9

3 Contracts Signed 0 days Fri 8/8/14 Fri 8/8/14 8/8

4 Solar City Internal Job Prep 10 days Mon 8/11/14 Fri 8/22/14

5 Structural, Electrical & Engineering Design & 30 days Mon 8/25/14 Fri 10/3/14 Design,Engineering & approval Permit

6 Materials Procurement 20 days Mon 9/8/14 Fri 10/3/14

7 On Site Construction Prep 10 days Mon 9/29/14 Fri 10/10/14

8 Construction 20 days Mon 10/13/14 Fri 11/7/14 Construction

9 System Interconnection 12 days Mon 11/10/14 Tue 11/25/14 Interconnection

10 Project Completion 10 days Wed 11/26/14 Tue 12/9/14

SolarCity 3055 Clearview Way Draft copy: NOT APPROVED FOR CONSTRUCTION San Mateo, CA 94402 Page 1 Massachusetts Electric Company Nantucket Electric Company All information is confidential and proprietary d/b/a National Grid D.P.U. 16-33 Attachment AG 1-3-Redacted Page 759 of 859 4. Operations and Maintenance (O&M) a. Capability and Cost to Provide the Required 5 Years of PV System O&M

i. Qualifications and Experience of Regional Field Service Personnel

SolarCity’s O&M department is organized to better serve the needs of our customers by clearly defining the roll of O&M and allow those managing production to focus on throughput and quality installations. O&M is the responsibility of the Regional Field Service Managers (RFSM’s) and the Director of Plant Operations and Maintenance.

The O&M Department is broken into three distinct teams. The Customer Tech Support team fields technical questions from our customers as well as proactively calling them regarding savings and PTO cases. The System Diagnostic team analyzes data from our monitoring equipment to identify any underperforming systems as well as diagnose problems and dispatch field service techs when necessary. The Field Services team is led by four managers, one for each region. They are tasked with fixing broken or underperforming systems post PTO.

Joseph O’Keefe – Regional Field Service Manager Joseph O’Keefe, Regional Field Service Manager for the Northeast, will be the primary respondent for post installation service work as it relates to performance and system uptime issues National Grid may see. He will be responsible for dispatching the appropriate service technician or entity depending on the scope and issues National Grid is seeing. Joe is based out of our Beltsville, Maryland warehouse.

Before working with SolarCity, Joe worked for 10 years in residential construction. Upon joining the company in 2011 he was quickly promoted to crew lead and then to Residential Service Technician in 2012. Over the last two years, Joe excelled in maintaining a consistent throughput of service cases for his region. In this capacity Joe developed an excellent feedback loop with the ROM and local crews. Joe was also very involved in the commissioning and servicing of our largest east coast commercial systems. Joe provides oversight to the Field Service technicians working in his region. Additionally he is responsible for providing technicians with training opportunities, following up on open cases, managing schedules, and fulfilling preventative maintenance obligations.

Jimmy Bergeron – Director of Plant Operations and Maintenance Jimmy Bergeron is a NABCEP-certified PV installer and commercial and industrial electrician with seven years of experience managing large-scale commercial and utility-sized PV systems. Prior to his position as the Director of Plant Operations and Maintenance, managing the operations of tens of thousands of PV projects, Jimmy spent the last six years at SolarCity in various roles, improving the quality of our solar energy systems. Jimmy has constructed more than 150 residential and commercial projects for SolarCity. He has served as the principle Head Program Manager for 200 Walmart installations totaling 71MW and managing a $96 million budget for installed jobs. He has developed policies, procedures, and estimating and data tracking tools for SolarCity’s Commercial Construction Department. Jimmy has a Bachelor’s degree from Villanova University.