CCTA Process Review TAS Update – Feb 12th 2016 RPCG: Chair – Gary Deshazo, Jeff Hein WECC team: Vijay Satyal & Colby Johnson Western Electricity Coordinating Council

Western Electricity Coordinating Council RPCG and CCTA process Forum of Regional Planning Groups 3 CCTA cycles CCTA Process- Review and provide input on “most likely” transmission projects for C. Case Focus: Projects that are either in the “planning” or “construction” phase* * Projects in-service are assumed to be part of the base case topology Western Electricity Coordinating Council

Common Case Building Blocks LRS Submittals Utility IRPs Resource Planners Work Group Participants NREL Data LRS Submittals DSM Task Force RPCG Common Case Transmission Assumptions (CCTA) WECC Powerflow Case Loads DWG Resource Portfolio SWG Transmission Network SWG Modeling Enhancements MWG Data Improvements DWG WECC Staff Common Case Data-Set (PCM) Debugging/Validation DWG/MWG/SWG/Staff WECC Staff Scenario Runs/Analysis/Reporting

Edit existing projects through interactive map *Paths shown are approximations and are provided to us in the form of Keyhole Markup Language (KML) by project sponsors/contacts Add new/edit projects through “list view”

Western Electricity Coordinating Council Data Outreach Western Electricity Coordinating Council

CCTA Process - Overview CCTA Selection Process Review CCTA Criteria Flow Chart Criteria 1-5 Detailed Review Transmission Projects: Under Construction Met Criteria 1 &2 -> Default Inclusion Transmission Projects: Not Under Construction Did meet Criteria 3 & 4 & 5 (if necessary) -> Inclusion Did not meet Criteria 3, 4, 5 -> Exclusion Ballot Review: Inclusion/Exclusion List, Tie Final 2026 CCTA Project List & Future Improvements Western Electricity Coordinating Council

5 Criteria Used For Project Review Criteria 1: Regional Significance Based on Voltage: 230kV and above Criteria 2: Construction Status Is the project currently under construction? Criteria 3: Financial Indicators Financial questions added to project survey to indicate if the project has financial commitment Criteria 4: Implementation Status Indicators Environmental Impact Status (EIS – if required) questions added to survey Criteria 5: Project Dependency Is this project dependent upon another transmission project to be completed and used for its intended purpose? If so, did the dependent project pass the CCTA criteria? Western Electricity Coordinating Council

CCTA Not CCTA Criteria 1 No Yes Criteria 2 Criteria 3 Yes No No Yes Regional Significance No Project A Project … Project Z Yes Criteria 2 Under Construction Criteria 3 Financial Indicators Yes No No Yes Criteria 4 Implement. Indicators Yes No Passed RPCG Screen Criteria 5 Dependency Check N/A No CCTA Yes Not CCTA Western Electricity Coordinating Council

Criteria 1: Regional Significance Projects at 500 kV or above A project must meet one of the following voltage levels to be of regional significance and be further considered in the CCTA selection process Projects at 230 kV and above, unless they are not a backbone1 facility 1 Backbone transmissions are facilities that connect smaller pockets of the transmission network Western Electricity Coordinating Council

Criterion 2: Construction Status Yes CCTA Is the project currently under construction? No Proceed to Criteria 3 Western Electricity Coordinating Council

Criteria 3: Financial Indicators Implement. Indicators Does the project have a commitment for financing to construct the project? To be included in CCTA; Must answer “Yes” to at least one of the following questions Does the project have executed transmission service agreements that commit the project developer to construct the project? Yes Is the project included in an Integrated Resource Plan (IRP)? No If there is generation associated with the project, has the gen. project been identified in an LSE procurement process and/or have contracts for the generation been signed? Does the project have executed participation contracts with other parties that commit the parties to construct the project? Not CCTA Western Electricity Coordinating Council

Criteria 4: Implementation Status Indicators Two key- indicators Does the project require a EIS and/or similar state/county/town-level environmental or siting process? Criteria 5 Dependency Check No Yes Filed required applications, applications must have been accepted or deemed completed, formal noticed public meeting (or equivalent) completed? Not CCTA Until these steps have been taken* No Yes Criteria 5 Dependency Check Western Electricity Coordinating Council

Criteria 5: Dependency Check Is this project dependent on another transmission project to be completed and used for its intended purpose(s)? No (N/A) Two primary dependency questions CCTA Yes If so, did the dependent project pass the CCTA criteria? Yes Define project dependency: No Not CCTA Western Electricity Coordinating Council

All Prior CCTA Projects Newly-Submitted CCTA Projects Process Overview All Prior CCTA Projects 2026 CCTA Inclusions 2026 CCTA Criteria Newly-Submitted CCTA Projects 2026 CCTA Exclusions Western Electricity Coordinating Council

Western Electricity Coordinating Council Check-in Western Electricity Coordinating Council

Criteria-based results Internal review Criteria developed in consultation with entities Electronic voting by RPCG members Staff recommendation of CCTA 2026 list Western Electricity Coordinating Council

Under Construction: To Be Included 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 - Complete and In-Service 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) Western Electricity Coordinating Council

Not Under Construction; 2026 CCTA Inclusion Met CCTA selection Criterion 3, 4, and/or 5: Boardman-Hemingway 500 kV (B2H) Delaney - Colorado River 500 kV Transmission Project (Ten West Link) Gateway South Project – Segment F (Aeolus-Mona 500 kV) Gateway West Transmission Project Segment D (Bridger – Populus) Gateway West Transmission Project Segment D (Windstar to Jim Bridger) Gateway West Transmission Project Segment E (Midpoint – Hemingway ) Gateway West Transmission Project Segment E (Populus – Midpoint) Gateway West Transmission Project Segment E (Populus – Cedar Hill - Hemingway) Harry Allen - Eldorado 500 kV Transmission Project (Centennial II: Harry Allen - Eldorado) I-5 Corridor Reinforcement Project (Castle Rock - Troutdale) Morgan-Sun Valley 500kV Line Southline Transmission Project (Afton-Apache) Southline Transmission Project (Apache-Saguaro) Talega-Escondido / Valley-Serrano 500 kV Interconnect Tres Amigas Wallula to McNary 230 kV (Energy Gateway Segment A) Western Electricity Coordinating Council

Not Under Construction; 2026 CCTA Exclusion Did not meet Criteria 3, 4, and/or 5: Bighorn-Eldorado Centennial II (Amargosa-Northwest) Centennial II (Northwest - Harry Allen) Centennial West Clean Line Chinook 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 Mountain States Transmission Intertie (MSTI) (Townsend-Midpoint 500 kV) North Gila - Imperial Valley #2 Project NV Energy Robinson - Harry Allen 500 kV Line Pawnee-Daniels Park Southern Nevada Intertie Project (SNIP) Southwest Intertie Project - North (SWIP-North) TransWest Express Transmission Project West Side Tie Western Spirit Clean Line Westside Tie 345/500 kV Wyoming-Colorado Intertie Project Zephyr SunZia Southwest Transmission Project WECC - Eastern Interconnect DC Tie Upgrade Project Western Electricity Coordinating Council

RPCG Member Voting and Ballot Results Neutral votes not counted In instance of a “tie”, RPCG to determine Western Electricity Coordinating Council

Western Electricity Coordinating Council 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 *Pawnee-Daniels Park *Updates provided after poll sent out; 1 additional “Inclusion” per criteria Based on updates, two “new” projects to inclusion list. Are there any disagreements? Western Electricity Coordinating Council

Did not meet Criteria 3, 4, and/or 5: Transmission Projects: Not Under Construction Poll Majority – Agree to Exclude Did not meet Criteria 3, 4, and/or 5: 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 Path 8 Upgrade/Colstrip Transmission Upgrade 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 (SWIP-North) 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 Projects highlighted in red, projects where Western Electricity Coordinating Council

Polling Tie Projects (1 to 1 Include/Exclude) 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) 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” Outcome -> Consensus to Exclude from CCTA What is the will of the group? Do we err on the side of caution and exclude? Get members thoughts. Western Electricity Coordinating Council

Final 2026 CCTA Project List Boardman – Hemingway (B2H) [500 kV] Delaney – Colorado River (Ten West Link) Delaney – Palo Verde [500 kV] Delaney – Sun Valley [500 kV] Energy Gateway: Wallula – McNary [230 kV] Energy Gateway South: Aeolus – Mona [500 kV] Energy Gateway West: Bridger – Populus [500 kV] Energy Gateway West: Windstar – Jim Bridger [230-500 kV] Energy Gateway West: Midpoint – Hemingway [500 kV] Energy Gateway West: Populus – Midpoint [500 kV] Energy Gateway West: Populus – Cedar Hill – Hemingway [500 kV] Harry Allen – Eldorado (Centennial II) [500kV] I-15 Corridor Reinforcement Project (Castle Rock – Troutdale) Morgan – Sun Valley [500 kV] Pawnee – Daniels Park West of McNary Reinforcement Project Group 2 (Big Eddy – Knight) If the previous slide gets unanamous agree to exclude… this will be the final 2026 ccta. If not, we will have to make minor changes. Blue text denotes under construction or in-service

2026 Common Case Transmission Assumptions (CCTA) The purpose of the CCTA is to provide a basic set of facilities that TEPPC can use as a starting point for their own studies. The CCTA is a list of facilities that are expected to be in-service by 2026. Boardman – Hemingway (B2H) [500 kV] Delaney – Colorado River (Ten West Link) Delaney – Palo Verde [500 kV] Delaney – Sun Valley [500 kV] Energy Gateway: Wallula – McNary [230 kV] Energy Gateway South: Aeolus – Mona [500 kV] Energy Gateway West: Bridger – Populus [500 kV] Energy Gateway West: Windstar – Jim Bridger [230-500 kV] Energy Gateway West: Midpoint – Hemingway [500 kV] Energy Gateway West: Populus – Midpoint [500 kV] Energy Gateway West: Populus – Cedar Hill – Hemingway [500 kV] Harry Allen – Eldorado (Centennial II) [500kV] I-15 Corridor Reinforcement Project (Castle Rock – Troutdale) Morgan – Sun Valley [500 kV] Pawnee – Daniels Park West of McNary Reinforcement Project Group 2 (Big Eddy – Knight) 5 1 9 7 8 Blue text – Indicated “Under Construction” 6 Regional Planning Coordination Group (RPCG) CAISO – California Independent System SIERRA – Sierra Subregional Planning Group CTPG – California Transmission Planning Group SWAT – Southwestern Area Transmission CG – Columbia Grid AESO – Alberta Electric System Operator CCPG – Colorado Coordinated Planning Group BCCPG – BC Coordinated Planning Group NTTG – Northern Tier Transmission Group 2 3 4

Overall Feedback on Process Criterion 3 and 4 to be reviewed and/or refined in future planning cycles Definitions Which ones to use? Impacted entity ? Thresholds Example: % of ROW determination / % of EIS draft completeness Western Electricity Coordinating Council

Contact Information Colby Johnson – Assoc. Engineer System Adequacy Planning Office: (801)819-7662 cjohnson@wecc.biz Vijay Satyal – RPCG Liaison vsatyal@wecc.biz Western Electricity Coordinating Council