10. How can the marginal loss surplus be allocated without undoing the incentives created by marginal loss implementation? (STEC) A. ERCOT does not have an opinion at this time regarding allocation of the marginal loss surplus. 11. Please provide the modeled changes in generator revenues from ancillary services. (Vistra) A. Ancillary service costs and revenues were not assessed as part of this study. The unit commitment requirements to account for ancillary services were not changed across the 6 runs included in the study results. 12. Please provide the changes to annual unit revenue shortfalls by zone. (Vistra) A. The changes to the annual unit revenue shortfalls reported by the model for the base case and two sensitivities are provided in the following table: Change in Annual Unit Revenue Shortfall (in $M) Low Gas Price Case Base Case High Gas Price Case Houston Zone 4.1 1.2 4.5 Zone 11.4 28.7 35.0 Zone 4.9 13.8 25.9 West Zone 1.2 -0.1 0.5 13. Please provide the changes to annual unit startup cost by zone. (Vistra) A. The changes to the annual unit startup costs reported by the model for the base case and two sensitivities are provided in the following table: Change in Annual Unit Startup Cost (in $M)
Reciprocating engines - -1.5 -2.3 - Gas steam non-reheat or boiler without air-preheater 0.5 -0.1 - -0.1 Gas steam reheat boiler 10.3 -16.9 12.0 -4.4 Gas steam supercritical boiler 28.9 - - - Hydro - -0.2 -0.0 - Nuclear - -13.5 28.6 - Simple-cycle greater than 90 MW 7.1 -8.3 9.4 -1.0 Simple-cycle less than or equal to 90 MW 5.5 -0.1 -0.5 -0.9 PhotoVoltaic Generation Resources - -0.9 -0.0 -11.8 Wind generation Resources - -2.7 -14.1 -103.4 Other - -0.3 - 0.1 Change in Annual Generation (Low Gas Case, in GWh) Houston Zone North Zone Zone West Zone Combined-cycle greater than 90 MW 2,657 -3,494 74 -878 Combined-cycle less than or equal to 90 MW 636 - 256 -252 Coal and lignite 363 -1,612 -15 -83 Reciprocating engines - -51 -67 - Gas steam non-reheat or boiler without air-preheater 0 1 - - Gas steam reheat boiler 334 -561 426 -149
Gas steam supercritical boiler 1,014 - - - Hydro - - 1 - Nuclear - -1 265 - Simple-cycle greater than 90 MW 142 -348 345 -28 Simple-cycle less than or equal to 90 MW 80 -2 -29 -1 PhotoVoltaic Generation Resources - - 0 7 Wind generation Resources - 3 209 16 Other - -11 - 3 Change in Annual Generator Revenue (Base Case, in $M) Houston Zone North Zone Zone West Zone Combined-cycle greater than 90 MW 125.6 -234.3 5.5 -26.5 less than or equal to 90 MW 18.1 - 24.7 -5.4 Coal and lignite 55.9 -55.0 8.4 -12.3 Reciprocating engines - -0.6 -1.3 - Gas steam non-reheat or boiler without air-preheater -1.6 2.9 - -0.2 Gas steam reheat boiler 4.6 -13.3 4.7 -1.6 Gas steam supercritical boiler 15.8 - - - Hydro - -0.2 -0.1 - Nuclear - -14.4 42.4 -
Simple-cycle greater than 90 MW -0.9 -13.8 15.9 -0.9 Simple-cycle less than or equal to 90 MW -1.3 0.2 -0.0 -1.0 PhotoVoltaic Generation Resources - -1.1 -0.0 -14.0 Wind generation Resources - -2.6 -13.4 -117.8 Other - -0.8 - 0.1 Change in Annual Generation (Base Case, in GWh) Houston Zone North Zone South Zone West Zone Combined-cycle greater than 90 MW 3,359 -6,790 444 -949 Combined-cycle less than or equal to 90 MW 496 - 753 -190 Coal and lignite 1,641 -496 335 -374 Reciprocating engines - -16 -31 - Gas steam non-reheat or boiler without air-preheater -28 79 - - Gas steam reheat boiler 109 -343 122 -43 Gas steam supercritical boiler 436 - - - Hydro - - 1 - Nuclear - 1 252 - Simple-cycle greater than 90 MW -30 -460 480 -19 Simple-cycle less than or equal to 90 MW -49 4 -12 -0 PhotoVoltaic Generation Resources - - 0 5
Wind generation Resources - 4 279 24 Other - -10 - 4 Change in Annual Generator Revenue (High Gas Case, in $M) Houston Zone North Zone South Zone West Zone Combined-cycle greater than 90 MW 137.1 -307.4 25.2 -24.0 Combined-cycle less than or equal to 90 MW 17.3 - 31.6 -1.6 Coal and lignite 99.9 -61.4 18.8 -27.8 Reciprocating engines - -0.3 -0.9 - Gas steam non-reheat or boiler without air-preheater -2.2 0.5 - -0.2 Gas steam reheat boiler 3.9 -11.8 4.6 -0.9 Gas steam supercritical boiler 11.9 - - - - -0.3 -0.1 - Nuclear - -14.0 43.9 - Simple-cycle greater than 90 MW -5.0 -18.0 18.8 -1.2 Simple-cycle less than or equal to 90 MW -5.2 0.0 -0.0 -1.0 PhotoVoltaic Generation Resources - -1.1 -0.0 -14.5 Wind generation Resources - -2.0 -15.9 -118.0 Other - -0.7 - 0.0