Anchor Data Set (ADS) Process Guide

Process Overview & Supporting Documentation WECC

WECC Release: 09/01/2017

RAC Stakeholder Feedback Due: 09/21/2017 155 North 400 West, Suite 200 Salt Lake City, Utah 84103-1114 CONTENTS

3 Anchor Data Set Process Guide (DRAFT) August 30, 2017

1. OBJECTIVE

For many years, WECC has been aware that data used in its various reliability assessment models (e.g., Power Flow-PF; Production Cost Model-PCM) has varying degrees of consistency and, to some extent, redundancy in terms of the data’s development and collection across different platforms. To address this redundancy, the Anchor Data Set (ADS) has been created to provide a single, coordinated data source from which WECC and their stakeholders may draw the technical data they need to perform Year-10 reliability assessments and other planning studies. The ADS is intended to also provide an avenue for the Regional Planning Groups (RPGs) that include Western Planning Regions (WPR) (ColumbiaGrid, Northern Tier Transmission Group (NTTG), the California Independent System Operator (CAISO) and WestConnect) and International Planning Regions (IPR) (British Columbia Coordinated Planning Group (BCCPG), Alberta Electric System Operator (AESO), Comisión Federal de Electricidad (CFE)) to coordinate with WECC through each study cycle using consistent and complete data. The WPR and IPR and other stakeholders use both PF and PCM models to plan for their respective regions and from this point forward should rely on the ADS to meet their modeling needs for year-10 year case that coincide with the 2 year planning cycle. The ADS Process Guide primarily comprises of 2 key documents that account for the following: Power Flow related Data Preparation Manual (DPM) that accounts for the Power Flow Base Case development and PCM related Data Development & Validation Manual (DDVM) that accounts for production cost based modeling. The supporting documents include information that address the following key questions: 1. What are the sources of the data? 2. In what format will the data be submitted to WECC? 3. How is it collected and managed? 4. How is the data validated, and if stakeholder input is required, which RAC Sub-Committee will administer the validation and consequent approval that the WECC process and procedures were followed to develop the ADS?

4 2. THE ANCHOR DATA SET

The ADS is a compilation of load, resource, transmission topology, and other information used by the WPRs and IPRs in their regional transmission plans used by other stakeholders in their various planning analyses. The data contained within the ADS will be consistent with WECC’s and the planning regions’ “preferred” programs for PCM and PF models1, including dynamic data and associated assumptions. Power flow and stability data contained in the ADS is developed by NERC Registered Entities in the U.S. and international entities in the Western Interconnection (i.e., Balancing Authorities (BAs’), Transmission Planners (TPs’) and/or Planning Coordinators (PCs’)) and shall be consistent with state and federal public policy requirements.

As described in the proposal to develop the ADS, the data included reflects applicable state and federal statutory public policy requirements such as Renewable Portfolio Standards (RPS), Regional Haze Programs, and Mercury and Air Toxic Standards (MATS). The ADS also creates a common representation of the loads, resources, and transmission topology across the Western Interconnection 10 years in the future. This representation includes data used by the WPR to create regional plans compliant with FERC Order No. 1000 and be compliant with public policy requirements; The ADS is comprised of the following types of data: 1. Existing, planned, and retired transmission topology in the year 10 planning horizon; 2. Existing, planned, and retired resources (generators) in the year 10 planning horizon; 3. Load forecasts in the year 10 planning horizon; and 4. Other data needed for planning studies such as generating unit start‐up times, variable O&M costs, emission costs and other data necessary for PCM modeling such as economic grid simulation. Data encompassed within the ADS is collected through the processes described in the WECC Data Preparation Manual (DPM) and WECC Data Development & Validation Manual (DDVM) (hyperlink to be added later) both of which are an integral part of this document. These manuals provide, in explicit detail, an outline of the data requirements and reporting procedures that are necessary to meet all data requirements of the ADS. They are maintained by the Reliability Assessment Committee (RAC) and its subcommittees and are revised as needed through established RAC processes. Data developed by these entities for inclusion in the ADS may be transmitted to WECC via BAs’, TPs’, and/or PCs’, and/or other applicable entities pursuant to (but not limited to) these organizations’

1 Data generally includes forecast loads, existing and planned transmission, existing and planned generation additions and retirements, and other planning data necessary to perform production cost analyses, power flow studies, dynamic system performance studies, and short circuit studies.

5 responsibilities to satisfy the NERC reliability planning standards. The ADS will reflect the Planning Region view of loads, resources and transmission topology for the year 10 planning horizon.

2.1 ADS WORKFLOW The ADS provides a common starting point for WECC and stakeholders in conducting PCM and PF/dynamic models. In compiling the ADS, the data initially developed by the Planning Regions is expected to align with the PF DPM and PCM DDVM. WECC will communicate with the registered entities when submitted data appears to be inconsistent with processes defined in the- PF DPM and PCM DDVM. Modified data will be submitted to WECC through the entities’ respective BAs’, TPs’ and/or PCs’. In such cases, the entities modifying ADS data will document their changes and make the documentation available to interested stakeholders. The ADS process flow shown in Figure 1.0 and Figure 2.0 illustrates how planning data and information flows between the transmission providers, RPGs and WECC. The workflow description identifies the following tasks, accountability roles and challenges for Anchor Data Set Taskforce to coordinate:

 Tasks and Responsibility for managing the planning data and information throughout the stages of the ADS process flow

 Contextual clarity for the “Data Submitter”2 (and Area Coordinators) providing the context for the source of the planning data and information that is used by the WPRs, IPRs and WECC. The timeline for the ADS workflow is ongoing and generic in nature once initiated on January 1, 2018. The entire process encompasses a two year time span that is consistent with the interregional coordination process of the WPRs and IPR; beginning in January of every even year and ending in December of the following odd year.

2 Planning Coordinator, Transmission Planner, Balancing Authority

6 Figure 1.0 ADS Workflow with Western Planning Regions (U.S. only), RAC and Data Submitters

Figure 2.0 ADS Workflow with International Planning Regions, RAC and Data Submitters

7 2.2 ADS WORKFLOW: EXPECTATIONS, TASKS AND RESPONSIBILITIES The ADS process flows that are shown in Figure 1.0 and Figure 2.0 illustrates how planning data and information flows between the transmission providers, WPRs, IPR and WECC. Commensurate with flow diagrams such as those shown in the earlier figures, each of the elements of the flow process are represented by a process or data that are interconnected through actions illustrated by the figure’s swim lanes. While the process flows illustrate movement of work and/or responsibility through the process, it is important to note that a clear understanding of responsibility and action by the entities engaged in the process is necessary to ensure that the correct information is collected and passed from one process to the next.

8 Table 1 - ADS Process Responsibility and Timeline

Time Responsible Entity Expected Tasks Entity(ies) to Coordinate with Deliverables Underlying Assumptions Risk Factors for ADSTF review frame* Produce latest 2026 CC RPGs, Data Sub. Latest 2026 CC and related PCM WECC files Update RPGs Plans with 2026 PCM WECC, Data Sub. data RPGs Receive PCM and PF updates from Data Submitters and RAC.

RAC 2016 Q4* **** Review 2026 CC Output from WECC, RPGs, L&R reps. WECC Update relevant input assumptions Data Submitters into 2026 CC (TPs/BAs/PCs) Provide upgrades/input data to WPR for PCM update.

2017 Q1-Q3 Share C case 2026 Upgrades with WECC Data Submitters Initiate MOD-32 process to build Data Submitters, RAC 2027 HS PF B. Case WPR coordinate changes with Data ADS HS 2028 PF RPGs, ADSTF Submitters RPGs Review PCM Input assumptions WECC, Data Sub., ADSTF Updated 2026 WPR PCM Input files WECC will have access to change Coordination Challenges with Data for ADS cases from RPGs Submitters and Area Coordinators Compile WPR dataset that includes Regional Planning Groups One consolidated PCM case Single RPGs point of contact for Data Issues: Compilation / Solving/ regional RPG datasets development WI plan Sharing Provide PCM “other” data for 2028 WECC, ADSTF, RAC “Other” data input files Coordinate with Data Sub. Regional planning groups can’t ADS PCM development Single RPGs point of contact with agree - Data Sharing issues WECC Conduct Roundtrip WECC, Data Submitters, ADSTF, Solved 2026 HS PF case Single RPGs point of contact with Round-trip process – RAC Documentation of changes made WECC Computational delays / Data to solve PF Sharing issues 9 Time Responsible Entity Expected Tasks Entity(ies) to Coordinate with Deliverables Underlying Assumptions Risk Factors for ADSTF review frame* Data Submitters Provide input assumptions RPGs, ADSTF, RAC Change cases to RPG WECC will have access to change Data Sharing issues (TPs/BAs/PCs) cases from RPGs Review and Assist with the ADS ADSTF, Data Submitters, RPGs Review of Assumptions and RAC has oversight of the ADS RAC coordination with Data RAC Sub Committees Compilation (PCM and PF data) Approve relevant updates/changes process (not ADS products per se) Submitters, ADSTF and RPGs Develop 2028 HS PF w ADS inputs RPGs, RAC, ADSTF 2028 HS PF Case with ADS inputs Data Sub. will submit data aligned Data inconsistencies WECC Data Submitters with RPG plans Dynamics data incomplete

Review ADS Input of Data Data Submitters, ADSTF, Data Agreement with Data Submitters Base Case submitters coordinate Potential lack of coordination RPGs Submitters Submitters on data consistency with RPGs

2017 Q4 Validate ADS Input with RPGs WECC, RAC, ADSTF, RPGs Agreement with RPGs on data Base Case submitters coordinate Potential lack of coordination Data Submitters consistency with Data Submitters (TPs/BAs/PCs)

RAC Review of the ADS processes WECC, Data Submitters, ADSTF, Provide feedback and respond to RAC Sub-Committees and ADSTF Potential lack of coordination RPGs ADSTF concerns/needs coordinating efficiently Coordinate 2027 L&R with 2028 RPGs Draft ADS 2028 PCM data set Data inconsistency; Lack of central ADS PCM data input Data Submitters point of contact with RPGS for resolution Compile 2028 ADS PCM data set RPGs, Data Submitters Draft ADS 2028 PCM data set for “Other” PCM data has already Data inconsistency or discrepancy WECC (using HS 2028 PF) review/validation been validated, had majority support for inclusion Conduct Roundtrip WECC, RAC, ADSTF, Data Sub. Exported 2028 PF HS ADS; Data is consistent and Roundtrip Roundtrip capability, data sharing, 2018 Q1 Roundtrip Implementation compatible RAC oversight of process Participate in RAC and ADSTF WECC, RAC, ADSTF, Data Any updated changes from latest TBD TBD RPGs Submitters mid-cycle Transmission Plans Data Submitters Participate in RAC and ADSTF WECC, RAC, ADSTF, RPGs Provide due diligence/review TBD TBD (TPs/BAs/PCs) Review of the 2028 ADS PCM WECC, Data Submitters, ADSTF, Identify any ADS process changes; TBD Coordination between ADSTF, RAC Compilation and Roundtrip RPGs engage with ADSTF RPGS and RAC WECC Compile Final 2028 PCM data set RPGs Final 2028 PCM (for ADS); Exported “Other” PCM data has been Data inconsistency or discrepancy 2018 Q2 for ADS Data Submitters 1 hour 2028 PF ADS validated with majority support

10 Time Responsible Entity Expected Tasks Entity(ies) to Coordinate with Deliverables Underlying Assumptions Risk Factors for ADSTF review frame* Review of the Final 2028 ADS PCM Data Submitters, ADSTF, Data Relevant Change files to update ADSTF and RPGS in Coordination Coordination Challenges RPGs dataset Submitters next ADS cycle with Data Submitters Data Submitters Review of the Final 2028 ADS PCM WECC, RAC, ADSTF, RPGs TBD TBD TBD (TPs/BAs/PCs) dataset

11 1. 3 REGIONAL PLANNING PROCESS & COORDINATION WITH DATA SUBMITTERS

3.1 Approved Regional Plans

The regional transmission plans provide planning and infrastructure guidance during the planning cycle until the plans are updated during the following planning cycle. Data used in regional transmission plans are specifically defined in RPGs study plans and may include information such as peak load projections, existing resources, planned resource additions and retirements, and transmission topology assumptions including recommended transmission additions, among other things. Given that the ADS is a compilation of load, resource, transmission topology, and other information used by the RPGs in their regional transmission plans, specific details about how this information is developed and used in the various RPGs planning processes will not be discussed in this document. Stakeholders who are interested in learning more about the specific details of the RPGs planning processes and how their planning data and information is developed and used, should review the individual RPG planning documents that are relevant to their planning data and information. This information may be found at the links listed below.

 CAISO Transmission Planning Process: o Technical information related to the California ISO’s transmission planning process can be found in the Business Practice Manual for the Transmission Planning Process at: https://bpmcm.caiso.com/Pages/BPMDetails.aspx?BPM=Transmission%20Planning %20Process.  West Connect: o The WestConnect Regional Transmission Planning Process is performed biennially, beginning in even-numbered years, and results in the development of a Regional Transmission Plan every other year. During the biennial planning cycle, WestConnect will perform system assessments and determine if there are any regional reliability, economic, or public policy needs. If regional needs are identified WestConnect will solicit alternatives (transmission or non-transmission alternatives (NTAs)) from WestConnect members and stakeholders to determine if they have the potential to meet any identified regional needs. WestConnect will then evaluate those alternatives to determine whether any alternatives meet the identified regional needs, and which alternatives provide the more cost-effective or efficient solution. The more efficient or cost-effective regional projects will be identified in the WestConnect Regional Transmission Plan. Any regional alternatives that were submitted for the purposes of

12 regional cost allocation and selected into the Regional Transmission Plan may go through the cost allocation process if they are deemed to be eligible for regional cost allocation. o The WestConnect Planning Process is in conformance with Order No. 1000 as supplemented by numerous Compliance Filings and resulting FERC Orders. Readers can access the text of the compliance documentation on the WestConnect website,[1] and are encouraged to consult the compliance documentation and the WestConnect Business Practice Manual (BPM) for additional process information. Also, for TOs that are jurisdictional to the FERC, their FERC-approved tariff may preside over documents pertaining to the WestConnect Planning Process.

 Northern Tier Transmission Group (NTTG): o The objective of the Northern Tier Transmission Group (“NTTG”) Regional Transmission Plan (“RTP”) is to evaluate, from a regional perspective, whether NTTG’s transmission needs may be satisfied on a regional or interregional basis more efficiently or cost effectively than through local planning processes developed by the participating transmission providers that are Full Funders. NTTG’s RTP is not a construction plan, but provides valuable regional insight and information for all stakeholders (including developers) to consider and use in their respective decision- making processes. o The NTTG planning process is initiated by the gathering and coordination of Transmission Providers local transmission system plans and data, including Public Policy Requirements. Stakeholders may also submit data to be evaluated as part of the preparation of the Regional Transmission Plan, including data supporting transmission needs and associated facilities driven by Public Policy Requirements and Public Policy Considerations, and alternate solutions to the identified needs set out in the Transmission Providers’ Local Transmission System. An identification of the transmission requirements for the NTTG footprint is derived from these data submissions and a reliability assessment, using both powerflow and production cost modeling, is completed to select the more efficient or cost-effective projects to reliably meet the NTTG footprint requirements. Any regional projects that were submitted for the purposes of regional cost allocation and selected into the Regional Transmission Plan may go through the cost allocation process if they are deemed to be eligible for regional cost allocation. Details about NTTG’s FERC approved planning

[1][1] www.westconnect.com

13 processes are outlined in each Transmission Providers Attachment K that is posted on NTTG’s website.  ColumbiaGrid: o ColumbiaGrid’s planning process consists of activities that are governed by the Order 1000 and Planning and Expansion Functional Agreement (PEFA). Each planning cycle encompasses two year and it includes various technical planning studies and other activities such as the identification and evaluation of Order 1000 Needs for transmission facilities driven by reliability requirements, economic considerations or Public Policy Requirements. Interested parties may participate in ColumbiaGrid planning activities by receiving the information or attending the planning meetings that are open to the public. For more information regarding ColumbiaGrid planning process, please refer to its website at: http://www.columbiagrid.org/planning- expansion-overview.cfm

 Alberta Electric System Operator (AESO): The AESO is required by legislation to prepare a long-term transmission plan at least every two years. The AESO’s transmission planning process is based on detailed engineering evaluations of the transmission system over a 20-year planning horizon. It is a continuous process, involving frequent evaluation of assumptions and proposed transmission solutions. The transmission planning process involves three major steps: 1. Need assessment

2. Alternative development and screening

3. Selection of the preferred alternative

The three-step planning process begins with need assessment; determining the need for transmission under scenarios identified in load and generation forecasts. After identifying the need, the AESO establishes and screens several transmission alternatives to meet those needs. The AESO then identifies the alternatives, from which plans are developed to meet the needs detailed within its forecast scenarios. Figure 3.0 below provides a visual illustration for the same.

14 Figure 3.0 AESO Planning Process

 British Columbia Regional Planning Group (BCRPG) Within the province of British Columbia, the BCCPG (https://www.bccpg.com/) enables coordination and, where appropriate, integration of the transmission planning functions of

15 transmission owner members. Outside of British Columbia, the BCCPG represents the interests of its transmission owner members to the Western Interconnection through participation in the WECC RAC committee. The planning process for the two main Transmission Planners within the BCCPG are described below BC Hydro: The transmission planning process supports open and non-discriminatory access to the transmission system as per Attachment K of BC Hydro’s Open Access Transmission Tariff (https://www.bchydro.com/about/planning_regulatory/tariff_filings/oatt.html). BC Hydro’s transmission planning process includes the following activities:  Long term integrated resource planning. BC Hydro’s 20-year Integrated Resource Plan maps out how we will meet future demand for electricity through a combination of energy conservation and the development of generation resources. It also includes an assessment of transmission requirements for 30 years.

 Transmission capital planning. Projects that meet BC Hydro’s short and long-term needs are defined as part of the transmission capital planning process, and business cases are made for capital funding investments.

 Inter-regional planning. BC Hydro works with other transmission owners or providers who have an interest in transmission development in British Columbia, including WECC and the BCCPG. For more details, the reader is referred to the following link: https://www.bchydro.com/energy-in-bc/our_system/transmission/transmission-plan.html

Fortis BC: The transmission planning process supports open and non-discriminatory access to the transmission system as describe in the following link:

https://www.fortisbc.com/Electricity/CustomerService/TransmissionServices/Pages/default.aspx Fortis BC’s transmission planning process includes the following activities:  Long term integrated resource planning. FortisBC 20-year Integrated Resource Plan lays out how we will meet future demand for electricity through a combination of energy conservation and the development of generation resources. It also includes an assessment of transmission requirements for 20 years.

16  Transmission capital planning. Projects that meet Fortis BC’s short and long-term needs are defined as part of the transmission capital planning process, and business cases are made for capital funding investments.

 Inter-regional planning. Fortis BC works with other transmission owners or providers who have an interest in transmission development in British Columbia, including WECC, BC Hydro, Teck, Columbia Power and Celgar.

3.2 Coordination between Data Submitters (e.g., BAs’, TPs’, and PCs’) and Planning Regions

The WPRs and IPRs depend on WECC’s data collection processes to aggregate the modeling data and assumptions used in the Planning Regions regional transmission plans. Assembling, reviewing and finalizing planning data will require significant coordination between TPs, BAs and PCs (some of which is currently accomplished through WECC processes) and the WPRs or IPRs to produce a data set that is usable in PCM and PF/dynamic models for reliability analyses and evaluations. Additionally, to help ensure that the WPRs, IPRs, TPs’, BAs’ and PCs’ develop accurate data, WECC will continue its practice of reviewing data submissions to them and report any data errors found to the original data providers.

3.4 Data for International Entities

The Western Interconnection includes British Columbia and Alberta in Canada, as well as a portion of Baja California in Mexico. They undertake transmission planning that would be a source of data for the Anchor Data Set. The ADS process for the IPR is captured above in Figure 2.

3.5 Coordination between Registered Entities and WECC

The ADS compilation process is based on WECC receiving PF data from Data Submitters who are registered with NERC as a TP, BA and/or PC. The RPGs are responsible for coordinating their regional planning data and information with those Data Submitters or other submitters of data if they are directly associated with a planning region or associated with a member of a planning region.

2. 4 RELIABILITY ASSESSMENT COMMITTEE (RAC) OVERSIGHT OF THE ADS

The RAC is responsible for maintaining the processes and procedures associated with the ADS, the ADS process flow, the PF DPM and PCM DDVM.

17 4.1 BASE CASE DATA SUBMITTALS (POWER FLOW AND DYNAMICS DATA)

The year-10 base case data submittal will determine the topology used throughout the ADS. It is imperative that the Planning Regions coordinate with the data submitters to make sure the topology provided by the data submitters is in alignment with their WPR’s reginal transmission plan. Details of required data and the format of power flow data are covered in the DPM.

4.2 PCM Data Submittals

Data submittals responses to through WECC’s Load and Resource and base case data requests provide most of the data needed to populate the ADS. However, there may be other data requirements not provided by the data submitters that are necessary to create solvable PCM and PF/dynamic cases or to meet PCM other modeling needs that are not developed or provided by the data submitters’ above- mentioned entities. This may include: fuel prices, emission rates, inflation and discount rates, hourly output profiles for wind or solar resources located in specific areas, Renewable Portfolio Standard (RPS) assumptions, market driven Distributed Generation (DG) implementation assumptions, and environmental data. Such data will be collected through existing relationships and efforts conducted by the current RAC structure as outlined by the PCM Data Quality Protocol.

3. 5 APPENDIX

18