Colorado Rule 3627 – Ten Year Transmission Plan Page 1 of 2

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Colorado Rule 3627 – Ten Year Transmission Plan Page 1 of 2 Appendix A Proceeding 16M-XXXX# Colorado Rule 3627 – Ten Year Transmission Plan Page 1 of 2 See Metro Map 28 14 1 19 4 24 23 5 3 9 22 6 Calhan Sub (Tri-State) Falcon Sub (Tri-State) Nyberg (BHCE) 25 Arequa Gulch Sub (BHC) 5 21 8 10 26 27 20 16 2 West Station Sub (BHC) Reader Sub (BHC) 12 Pueblo Reservoir (BHC) 11 Greenhorn Sub Site (BHC) Pueblo Sub (BHC) 20 15 13 Rattlesnake Butte Sub Site (BHC) Calumet Sub Site (PSCo/Tri-State) 17 18 Iron Horse Sub (Tri-State) *All projects are subject to change and routes have yet to be determined. Appendix A Proceeding 16M-XXXX# 2014 - 2015 2016 2017 2018 2019 Page 2 of 2 1 Rosedale Substation (New, PSCo) Baculite Mesa-Fountain Lake 115 kV Upgrade 14 Avery Distribution Substation (New, PSCo) Lost Canyon Main Switch 115 kV (New, Tri- 22 Avon – Gilman 115 kV (New, PSCo) 5 17 (and Fountain Lake Substation, BHCE) State) W.Station-Desert Cove 115 kV (Upgrade, La Junta 115/69 kV Transformer #2 (New, 23 Moon Gulch Distribution Substation (New, 2 15 BHCE) 6 Burlington-Wray 230 kV (New, Tri-State) BHCE) 18 San Juan Basin Energy Connect Project (Tri- PSCo) State) 3 Ptarmigan Substation (New, PSCo) 7 Happy Canyon Substation (New, PSCo) Portland 115/69 kV Transformer Replacement 24 Thornton Distribution Substation (New, PSCo) 16 (Upgrade, BHCE) 19 Southwest Weld Expansion Project (New, Tri- 25 Falcon-Midway 115 kV Upgrade (Tri-State) 4 Monfort-DCP Midstream 115kV Transmission 9 Rifle-Parachute 230 kV #2 (New, PSCo) State, PSCo) (New, PSCo) 8 Keller – Front Range 230 kV (CSU) Pueblo West Tap Line Uprate (Upgrade, Tri- Western Colorado Transmission Upgrade W. Station – Canon West 115kV Project (New, 20 26 10 State) Project (Upgrade, Tri-State) BHCE) 21 11 Boone-Nyberg 115 kV (New, BHCE) Arequa Gulch 115kV Capacitor (New, BHCE) 27 North Canon 115/69 kV Substation (New, BHCE) Boone 115/69 kV Transformer (Replacement, 12 BHCE) 28 Ault – Monfort 115kV Transmission (New, PSCo) Rattlesnake Butte 115 kV Terminal Addition 13 (Upgrade, BHCE) Appendix B Proceeding 16M-XXXXE Page 1 of 1 Denver-Metro 10 Year Transmission Plan Prepared for 2/1/2016, Rule 3627 24 23 CR 33 CR 2016 Cherokee-Ridge 230 kV Conversion (New, PSCo) 24 2019 Thornton Distribution Substation (New, PSCo) 33 2022 Pawnee-Daniels Park 345 kV Transmission (PSCo) 23 2019 Moon Gulch Distribution Substation (New, PSCo) Appendix C Proceeding 16M-XXXXE Page 1 of 1 Black Hills Colorado Electric Ten-Year Transmission Projects !( Teller Planned Substation El Paso 10 !( Substation AREQUA GULCH !( Planned Transmission ´ 115kV Transmission Fremont County MIDWAY 9 6 !( CANON WEST SUB !( !( NORTH CANON CANON PLANT (4.16 kV) DOT 115 kV CANON PLANT !( FOUNTAIN VALLEY 3 !( !( !( SOUTH CANON 5 Planned PORTLAND Fountain 4 !( Lake !( PDA 115kV SKALA 7 !( !( DESERT COVE !( BACULITE MESA !( !( WEST STATION AIRPORT NYBERG 8 !( HYDE PARK INDUSTRIAL !( NORTHRIDGE !( !( !( Crowley !( !( AIRPORT MEMORIAL !( BOONE Pueblo Reservoir PUEBLO PLANT READER !( !( 2 BURNT MILL !( GREENHORN Custer 1) La Junta 115/69kV Transformer #2 (2017) 2) Boone - Nyberg 115kV Project (2016) LAJUNTA 3) Fountain Lake 115/69kV Substation (2016) !( 4) Baculite Mesa -Fountain Lake 115kV Rebuild (2016) Otero 5) West Station - Desert Cove 115kV Rebuild (2015) 1 6) West Station - Canon West 115kV Project (2019) 7) Boone 115/69kV Transformer Replacement (2016) 8) Portland 115/69kV Transformer Replacement (2017) 9) North Canon 115/69kV Substation (2019) 10) Arequa Gulch 115kV Capacitor (2018) Rattlesnake Butte Huerfano !( 11) Rattlesnake Butte 115kV Terminal Addition (2016) 11 Content may not reflect National Geographic's current map policy. Sources: National Geographic, Esri, Date: 1/12/2016 GIS Support DeLorme, HERE, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, increment P Corp. Appendix D Proceeding 16M-XXXXE Page 1 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Summary Appendix D Black Hills Project Summary D‐1 Appendix D Proceeding 16M-XXXXE Page 2 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Summary NERC Planned Description and Est. Cost ‐ Reliability Alternatives Category Project ISD Purpose 2015 USD Criteria Reviewed Rebuild 115 kV line from West Station to West Station‐ Desert Cove Desert Cove 115 substations (Final TPL‐002, Transmission 2015 $3,700,000 None kV Transmission 2012 BHCT LTP TPL‐003 Line Rebuild Report_021913.pdf). Improved reliability in the Pueblo area. Convert Rattlesnake Rattlesnake Butte substation to a Butte 115 kV ring bus configuration Substation 2016 $1,850,000 None Terminal and add a terminal to Addition interconnect a wind generation project. Increased reliability and capacity by (1) Boone 230/115 rebuilding the existing kV transformer #2 circuit with larger (preferred conductor and adding alternative), (2) a second circuit, both Boone‐Nyberg 115 Boone‐Nyberg on monopole steel Transmission 2016 $10,000,000 TPL‐003 kV line #2, (3) 115 kV Line #2 structures within Rocky Ford 69 kV existing ROW.( Boone generation, (4) 230‐115 kV T2 Project Reader‐S. Fowler‐ Report_Rev1‐2.pdf La Junta (BH) 115 and BHCE 115 kV kV line System and Lamar DC Tie Final Report.pdf) (1) Ftn. Lake New 115/69 kV 115/69 kV sub., (2) substation at Belmont Ftn. Lake 115/13.2 Tap on the West kV sub., (3) Ftn. Station ‐ Overton 69 Lake 115/69 kV Fountain Lake kV line (NERC and 115/13.2 kV Substation 115/69 kV 2016 $12,800,000 TPL‐003 Category C sub., (4) Airport Substation Study_WPC.pdf). Memorial 115/69 Additional voltage kV sub., (5) Ftn. support and load Lake 115/69 kV growth capacity. sub. and Santa Fe 115/13.2 kV sub. D‐2 Appendix D Proceeding 16M-XXXXE Page 3 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Summary NERC Planned Description and Est. Cost ‐ Reliability Alternatives Category Project ISD Purpose 2015 USD Criteria Reviewed Rebuild existing 115 kV line between Baculite Mesa and Baculite Mesa‐ new Ftn. Lake Fountain Lake Transmission 2016 substation (Final 2010 $3,000,000 TPL‐003 None 115 kV Line BHCT LTP Report.pdf). Rebuild Increased reliability and generation interconnection. (1) Replace La Add transformation Junta (BH) capacity at BHCE’s transformer only, Boone and La Junta (2) Replace substations (Final La La Junta 115 kV TPL‐002, transformer and SB‐100 2017 Junta Tie $6,000,000 Area Upgrades TPL‐003 add 69 kV line, or Study_041609.pdf). (3) Replace Add a 69 kV capacitor. transformer, add Improved reliability in 69 kV line, and the La Junta area. add 115 kV line. Replace existing 25 MVA Portland transformer with 80 MVA unit (Final 2012 Portland 115/69 BHCT LTP TPL‐002, Distribution kV Transformer 2017 $2,500,000 None Report_021913.pdf). TPL‐003 Replacement Improve reliability and add additional transformation capacity. (1) Add a 115 kV Arequa Gulch Improved voltage capacitor or (2) Substation 2018 $900,000 TPL‐002 115 kV Capacitor support Add a 69 kV capacitor New transmission line connecting West (1) Line with load Station and West service substation Cañon with load at Portland or West Station‐ service substation at Penrose (2) West Transmission West Cañon 115 2019 $23,500,000 TPL‐003 North Cañon. Station‐Cañon City kV Line Increased reliability 115 kV line (3) and load service. (Final Joint 230/115 kV 2014 BHCT LTP double circuit Report) D‐3 Appendix D Proceeding 16M-XXXXE Page 4 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Summary NERC Planned Description and Est. Cost ‐ Reliability Alternatives Category Project ISD Purpose 2015 USD Criteria Reviewed New 115/69 kV substation at North Cañon on the planned North Cañon West Station – West Substation 115/69 kV 2019 Cañon 115 kV line. $9,900,000 TPL‐003 None Substation Increased reliability and load service. (Final 2014 BHCT LTP Report) Note: Projects completed prior to 2015 were omitted from this table but included in the detailed project sheets for reference. D‐4 Appendix D Proceeding 16M-XXXXE Page 5 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Summary Black Hills Colorado Electric ‐ Timeline ‐ Rule 3627 Projects Est. Cost, in Millions, 2015 Dollars 30.0 23.5 25.0 20.0 12.8 15.0 10.0 9.9 10.0 6.0 3.7 3.0 5.0 1.9 2.5 0.9 0.0 #2 kV kV Line 115 115 Line kV Terminal Upgrades Capacitor kV Substation Substation V 115 Lake Cove Transformer kV kV kV 115 Area 115 kV 115 kV Cañon Desert Rebuild ‐ Rebuild Addition Butte Fountain 115/69 115/69 ‐ 115 Nyberg Replacement ‐ Gulch 115/69 West Line ‐ Lake Station Mesa Junta Cañon Boone La Arequa Station Portland West Rattlesnake North Fountain Baculite West 2015 2016 2016 2016 2016 2017 2017 2018 2019 2019 Note: Projects completed prior to 2015 were omitted from this chart but included in the detailed project sheets for reference. D‐5 Appendix D Proceeding 16M-XXXXE Page 6 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Sheets Appendix D: Black Hills Project Sheets D‐1 Appendix D Proceeding 16M-XXXXE Page 7 of 38 Black Hills/Colorado Electric Utility Company, LP 2016 Rule 3627 Report – Appendix D – Black Hills Project Sheets Pueblo‐Hyde Park‐West Station 115 kV Transmission Line Project Sponsor: Black Hills Colorado Electric Additional Project Participants: Project Description: Rebuild existing Pueblo‐Hyde Park‐West Station 115 kV line (2009 SB07‐100 Report_Filed.pdf).
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