PC20 Coal Retirement A High CEERT, NRDC, PacifiCorp, SPSC, WIRAB, SPSG, Western Grid Group Modest coal retirements with replacement generation from gas resources X X X X PC21 Coal Retirement B High Aggressive coal retirements with incremental replacement generation from renewables X X X X High Renewables – Interconnection-Wide PC22 Specify high renewables target based on increased RPS across multiple states (e.g., 50% increase RPS levels) NRDC, PG&E, SPSC/WIRAB *15-Year Case X* X X X High Renewables – State Specific PC23 Small CA RPS increase: +12,000 GWh of renewables in-state High CEERT, IID Needed so other +12,000 cases can be compared X EC23-1 IID transmission expansion High IID X PC24 Large CA RPS increase: 40% RPS from in-state resources High CEERT, IID Represents step along way to PC22 15-year study w/ California at 50% X X EC24-1 Remove Path 26 constraints in PC24 High PG&E X EC24-2 Transmission expansion case based on results of E24-1 High PG&E X PC25 Add 12,000 GWh to Colorado and Wyoming High HPX Executive Committee X High Renewables – Specific (cont.)
EC25-1 Add transmission expansion to PC25 High HPX Executive Committee Likely AC project in CO (High Plains Express, HPX), DC project in WY X PC26 Retire 1900 MW IPP coal, add 1,200 MW combined cycle plant (at IPP) High DATC, Burbank X EC26-1 Add Zephyr (to IPP) and 2,200 MW of eastern Wyoming Wind High DATC, Burbank X EC26-2 Add Zephyr (to IPP) and 1200 MW CAES at IPP, 12,000 GWh of eastern Wyoming Wind to PC26; remove IPP CC High DATC, Burbank X PC27 Add 12,000 GWh wind to eastern Wyoming High DATC, Burbank X EC27-1 Add Zephyr (to Eldorado Valley) project High DATC, Burbank X PC28 Add 12,000 GWh wind to western Wyoming High TWE X EC28-1 Add TransWest Express project High TWE X EC28-2 Add TWE and Gridflex pumped storage project High TWE, Gridflex X PC29 Add 12,000 GWh wind to Montana, remove 12,000 GWh of NW RPS resources High NWPCC X High Renewables – State Specific (cont.)
EC29-1 Add Colstrip transmission project High NWPCC, Absaroka X EC29-2 Add Absoroka pumped storage project High Absoroka X PC30 BLM Study High BLM Add resources to BLM zones (high priority or all, not both) X EC30-1 Add transmission to BLM study High BLM X PC31 Add 12,000 GWh wind and solar to NM High Line, SWAT X EC31-1 Add Centennial West project High Clean Line Could be replaced with Western Spirit X PC32 Add geothermal resources to Southwest or Nevada High SPSG X EC32-1 Add Great Basin transmission project High Great Basin Paired w/ PC32 since project originates in NV X Other Studies PC33 Copper sheet study High ColumbiaGrid X PC34 Value of Transmission High IPPC-W Run LTPT such that it cannot add transmission and must rely on local resources to meet load X PC35 SPSC single-variant placeholder High SPSC X
NA Ocean energy study - assume RPS met with wave/offshore wind Medium IPPC-W X NA Transmission expansion for Midway-Tesla project Medium 2013 carry-over (Trans Bay Cable) X NA Impact of enhanced market coordination, implementation of EIM Medium PG&E X NA Stress test of the interface - model multiple sensitivities on G-E interface Medium SPSC X NA Market dynamics with copper sheet Medium SPSG X NA Cost Update to 2022 studies - include more refined capacity value analysis and in-state transmission costs Medium TWE X NA Maintain Base - Minimize future resource and transmission expansions and retirements Low SPSG Determining costs to keep current assets would be difficult. X Appendix B – 2013 TEPPC Study Program The 2013 TEPPC Study Program is provided for reference so the complete set of 2013 and 2014 studies can be viewed in a single document. Requests for 2024 Studies