2026 CCTA Criteria Filter Results Colby Johnson, Associate Engineer Western Electricity Coordinating Council

Western Electricity Coordinating Council Overview Criteria Run-Through List of Projects at each criteria Projects that meet Criteria 1&2 To be included in 2026 CCTA Projects that meet Criteria 3, 4, or 5 Projects for RPCG review Western Electricity Coordinating Council

Criteria 1: Regional Significance Starting Point Updates made to various projects Raw Project Information Portal data Criteria 1: Regional Significance Voltage-based; 200 kV and up Apply Filtering No sub 200 kV projects noted All projects in list meet Criteria 1 Number of Projects at Step 1: 67 Next Step Filter through Criteria 2 … Western Electricity Coordinating Council

Criteria 2: Under Construction Starting Point 67 projects which met Criteria 1 Criteria 2: Under Construction How many of the 67 are under construction? Apply Filtering 9 of 67 are under construction 4 of 9 are complete/in-service 5 of 9 to be complete within 1 year These 9 Projects Enter 2026 CCTA These projects were also included on 2024 CCTA Next Step Move to Criteria 3 Western Electricity Coordinating Council

Criteria 3: Financial Commitment Starting Point 67 projects which met Criteria 1 Criteria 3: Financial Commitment How many of the 67 are not under construction, but do have financial commitment? Apply Filtering 14 projects meet Criteria 3 Next Step Move to Criteria 4 Western Electricity Coordinating Council

Criteria 4: Implementation Factors Starting Point 14 projects which met Criteria 3 Criteria 4: Implementation Factor How many of the 14 require an EIS or similar? Apply Filtering 8 projects meet Criteria 4 6 projects no implementation data Next Step Move to Criteria 5 Western Electricity Coordinating Council

Criteria 5: Dependency Check Starting Point 13 projects which met Criteria 4 Criteria 5: Dependency Check How many of the 13 are dependent on another project Apply Filtering 1 dependent project Next Step RPCG Final Review Western Electricity Coordinating Council

Regionally Significant & Under Construction CCTA All projects were included in 2024 CCTA Western Electricity Coordinating Council

Remaining Projects (Criteria 3-4) Included on 2024 CCTA: Boardman-Hemingway Gateway West (Seg. D) Wallula to McNary Central Ferry – Lower Monumental Morgan – Sun Valley Assume to include in 2026 CCTA Nine new-to-2026 transmission projects for review Western Electricity Coordinating Council

Projects for RPCG Review CCTA RPCG Review Not CCTA Talega-Escondido – No further information Wallula to McNary – estimated in-service date 2017 Abel Ball – estimated in-service date 2020 Tres Amigas was excluded for 2024 due to Insufficient demonstration of financial commitment There is inadequate contractual documentation specifying the buyer or identified customers responsible to bear the costs of the project. New to 2026 Process 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

System Adequacy Planning Western Electricity Coordinating Council Contact Information Colby Johnson System Adequacy Planning Western Electricity Coordinating Council Office: (801)819-7662 cjohnson@wecc.biz Western Electricity Coordinating Council