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 High Gas Base Case Price Case 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)
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)
Questions_on_ERCOT_ML_study_09052018a.docx