10-Year Study Results California Resource Option

Renewable Options Under High Load Cases The Basics Study Concept Starting case: 2022 High Load (PC1-5) –Increase WECC annual energy demand 8% Results in additional 12,000 GWh of RPS resource requirements (per statutes) Model added 12,000 GWh in regions throughout WECC (w/ transmission) Goal Compare different resource and transmission options Total (capital and production) cost comparisons –Will be shown at a later date

Add: 12,000 GWh to meet WECC RPS Add transmission Renewable Options Under High Load Cases Increase WECC-wide load 8% For these regions

Increase WECC-wide load 8% 1 8% 8% increase to peak and energy 10% 10% decrease to energy Higher Load = Additional RPS Energy

Calculate ratios of planned renewables in TEPPC 2022 Common Case Do not include existing resources Do not include DG IRP and LRS data Apply ratio to study build-out of 12,000 GWh Concept: development trends are best the representation of what could be added to each state More resources available than what is identified in WREZ More granular information from CPUC/CAISO Locate resources using WREZ peer-analysis tool Extrapolation Method Add 12,000 GWh to meet WECC RPS 2

Wind Solar PV Solar Thermal Small Hydro Geothermal Biomass RPS Resource Option Studies Breakdown of Incremental 12,000 GWh

Higher load and new resources = 1- Check PRM 2 - Add CTs (if needed)

PC1-5 High Load PRM Gap 1) Added CTs in 100 MW increments to make up this 11,426 MW PRM Gap 2) CT’s were adjusted in Renewable Options Under High Load studies

Installed Generation Capacity Generation TypeAZ-NM-NVBasinAlberta British ColumbiaCA-NorthCA-SouthNWUSRMPAWECC Biomass RPS ,137 Geothermal ,4802, ,820 Small Hydro RPS ,759 Solar PV1, ,5173, ,377 Solar CSP ,591002,468 Solar CSP Wind1,9603,5974, ,1195,46012,0533,34435,009 Hydro3,9242, ,0467,8861,40130,9021,31366,811 Pumped Storage ,2121, ,296 Coal9,8759,9235, ,2396,52035,182 Nuclear4, ,2402,2461,16009,681 Combined Cycle17,1772,2636, ,00713,8047,1543,58662,900 Combustion Turbine4,3771,1464,619664,7597, ,62926,755 Other Steam1, , ,883 Other ,030 Negative Bus Load Dispatchable DSM1,1481, ,5792, ,597 Total47,37522,07722,65420,15841,11346,29957,26520,833277,775 Additional resources change this number

3 fewer CTs needed in Basin This makes sense: 3,000 MW wind × 10% = 300 MW to peak = 3 fewer CTs

WY-CO Intertie TransWest Express Zephyr A /B/C/D High Plains Express Path 8 Upgrade MSTI + SWIP N Selkirk – Bell – Ashe Nicola – Chief Joe Selkirk – Ashe DC Selkirk – Buckley DC SSPG East SSPG North SSPG South High Plains Express None Centennial West Transmission Expansion Projects 3 Add transmission

Now to the results… 1)Resource assumption overview 2)Portfolio Case generation results (versus PC1-5 High Load) 3)Transmission projects overview 4)Expansion case generation results (versus PC1-5 High Load and Portfolio Case) 5)Path flow results - Reviewed duration plots for key WECC paths. Will show some that are interesting in this presentation.

Lugo Tehachapi Imperial Valley Gates +299 California Resource Assumptions Wind Solar PV Solar Thermal Small Hydro Geothermal Biomass RPS

Production cost decreased $413 M (2.4%) Dump energy increased 3 GWh (.9%) Emergency Energy decreased 0% CO2 Emissions decreased 1.1% AZ, NV, CA

Decrease from PC1 Increase from CC

No change Decrease from CC

No change Decrease from CC

No change

Results at next SWG meeting