2026 CCTA Results - Western Electricity Coordinating Council

2026 CCTA Results - Western Electricity Coordinating Council

RPCG 2026 CCTA Results and Next Steps Colby Johnson & Vijay Satyal W E S T E R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N G 2 RPCG process Every 2 year effort Prior webinars- June, October Focus of this webinar- Discuss voting results to WECC proposed include and exclude list Future meeting/webinar to discuss adjustments W E S T E

R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N G 2026 CCTA Results Colby Johnson, Associate Engineer W E S T E R N E L E C T R C

I O C U I T Y N C I C L O O R D I N A T I N G 4 Overview CCTA Selection Process Review CCTA Criteria Flow Chart Transmission Projects: Under Construction Met Criteria 1 &2: Default Inclusion Ballot Review: Inclusion/Exclusion List Transmission Projects: Not Under Construction Did meet Criteria 3 & 4 & 5 (if necessary) -> Inclusion Did not meet Criteria 3, 4, 5 -> Exclusion Polling Tie Projects: Include/Exclude? Final 2026 CCTA Project List Future Improvements W E S T E R N E L E C T R C I

O C U I T Y N C I C L O O R D I N A T I N G 5 CCTA Selection Process Review 2026 CCTA Inclusions All Prior CCTA Projects Under Constr. 2026 CCTA Criteria Not Under Constr. Newly-Submitted CCTA Projects W E S T E R 2026 CCTA Exclusions N E L E C T R C

I O C U I T Y N C I C L O O R D I N A T I N G 6 Criteria 1 Project A Project Project Z No Regional Significance Yes Criteria 2 Yes Criteria 3 No Under Construction No Financial Indicators Yes Criteria 4 Yes Passed RPCG Screen Criteria 5 N/A E

S No Dependency Check Yes CCTA W No Implement. Indicators T E R N E L E C T R C I O C U I T Y N C I Not CCTA C L O O R D I N A T I N G 7 Transmission Projects: Under Construction These Projects Met Criteria 1 & 2; Included in CCTA Central Ferry Lower Monumental - Complete and In-Service Delaney-Palo Verde 500kV Line Delaney-Sun Valley 500kV Line

Desert Basin - Pinal Central - Complete and In-Service Devers - Colorado River 500 kV (DCR) Transmission Line Project - Complete and In-Service Energy Gateway Transmission Project - Segment G (Sigurd - Red Butte 345 kV line) - Complete and In-Service Hassayampa - North Gila 500kV #2 line - Complete and In-Service Interior to Lower Mainland Transmission (ILM) Project Pinal Central-Tortolita - Complete and In-Service Pinal West-Pinal Central-Browning (SEV) - Complete and In-Service West of McNary Reinforcement Project Group 2 (Big Eddy - Knight) W E S T E R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N G 8 Ballot Results Neutral votes not counted In instance of a tie, this group to determine W

E S T E R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N G 9 Transmission Projects: Not Under Construction Poll Majority Agree to Include Met CCTA selection Criterion 3, 4, and/or 5 (when applicable): Boardman-Hemingway 500 kV (B2H) Delaney - Colorado River 500 kV Transmission Project (Ten West Link) Energy Gateway: Wallula McNary (230 kV) Energy Gateway South: Aeolus-Mona (500 kV) Energy Gateway West: Bridger Populus Energy Gateway West: Windstar to Jim Bridger Energy Gateway West: Midpoint Hemingway Energy Gateway West: Populus Midpoint Energy Gateway West: Populus Cedar Hill - Hemingway Centennial II: Harry Allen - Eldorado 500 kV Transmission Project I-5 Corridor Reinforcement Project (Castle Rock - Troutdale) Morgan-Sun Valley 500kV Line *Path 8 Upgrade/Colstrip Transmission Upgrade *Pawnee-Daniels Park *Updates provided after poll sent out; 2 additional Inclusions W

E S T E R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N G 10 Transmission Projects: Not Under Construction Poll Majority Agree to Exclude Did not meet Criteria 3, 4, and/or 5: W E

S Bighorn-Eldorado Centennial West Clean Line Chinook Centennial II (Amargosa-Northwest) Centennial II (Northwest - Harry Allen) Great Basin HVDC Harcuvar Transmission Project Hemingway-Captain Jack 500 kV Transmission Line Juan de Fuca HVDC Sea Cable Juan de Fuca II HVDC Cable Lamar-Vilas Lassen 230kV East/West Tie Lucky Corridor Transmission Project T E R N E L E C T R C I O C U I T Y N C I C L Mountain States Transmission Intertie (MSTI) (Townsend-Midpoint 500 kV) North Gila - Imperial Valley #2 Project NV Energy Robinson - Harry Allen 500 kV Line Southern Nevada Intertie Project (SNIP) Southwest Intertie Project - North (SWIPNorth) SunZia Southwest Transmission Project TransWest Express Transmission Project West Side Tie Tres Amigas Western Spirit Clean Line Westside Tie 345/500 kV

Wyoming-Colorado Intertie Project Zephyr WECC - Eastern Interconnect DC Tie Upgrade Project O O R D I N A T I N G 11 Polling Tie Projects (1 to 1 Include/Exclude) What is the will of the group, Include or Exclude? Projects were originally in the Include list Southline Transmission Project (Afton-Apache) Comment: Project sponsor agrees this should not be included at this time Southline Transmission Project (Apache-Saguaro) Comment: Project sponsor agrees this should not be included at this time Talega-Escondido / Valley-Serrano 500 kV Interconnect Comment: Project does not appear in CAISO transmission plan, and has not been submitted to CAISO as a Merchant Project W Current status Undecided and seek input from RPCG E S T E R N E L E C T R C I O C U I T Y N C I

C L O O R D I N A T I N G 12 Final 2026 CCTA Project List Central Ferry Lower Monumental Delaney-Palo Verde 500kV Line Delaney-Sun Valley 500kV Line Desert Basin - Pinal Central Devers - Colorado River 500 kV (DCR) Energy Gateway Transmission Project Segment G (Sigurd - Red Butte 345 kV line) Hassayampa - North Gila 500kV #2 line Interior to Lower Mainland Transmission (ILM) Pinal Central-Tortolita Pinal West-Pinal Central-Browning (SEV) West of McNary Reinforcement Project Group 2 (Big Eddy - Knight) Boardman-Hemingway 500 kV (B2H) Delaney - Colorado River 500 kV Transmission Project (Ten West Link) Energy Gateway South: Aeolus-Mona 500 kV Blue text denotes under construction or in-service Energy Gateway West: Bridger Populus Energy Gateway West: Windstar to Jim Bridger Energy Gateway West: Midpoint Hemingway Energy Gateway West: Populus Midpoint Energy Gateway West: Populus Cedar Hill Hemingway

Energy Gateway: Wallula McNary 230 kV Centennial II: Harry Allen - Eldorado 500 kV I-5 Corridor Reinforcement Project (Castle Rock - Troutdale) Morgan-Sun Valley 500kV Line Path 8 Upgrade/Colstrip Transmission Upgrade Pawnee-Daniels Park 13 Overall Feedback on Process Criterion 3 and 4 to be reviewed and/or refined in future planning cycles Definitions Thresholds Adjustments to criteria ? FERC Order 1000 planning based improvements? Other regulatory/state planning/policy drivers? Future meeting June/July modify CCTA 2028 process?! W E S T E R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N

G 14 Contact Information Colby Johnson System Adequacy Planning Office: (801)819-7662 [email protected] Vijay Satyal Staff Liaison Sr. Policy Analyst [email protected] W E S T E R N E L E C T R C I O C U I T Y N C I C L O O R D I N A T I N G

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