Revisions to Credit Exposure Calculations for AS Products in RTC Update
"Explore the latest revisions in credit exposure calculations for Ancillary Service (AS) products linked to Real-Time Co-Optimization (RTC) in the ERCOT credit system. Updates cover various components like Unbilled Day-Ahead Amounts, Real-Time Liability, and Minimum Current Exposure (MCE)."
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Revisions to Credit Exposure Calculations for Ancillary Service (AS) Products related to Real-Time Co-Optimization (RTC) ERCOT Credit May 19, 2025
Revisions to Credit Exposure Calculations for AS Products Related to RTC Update Unbilled Day-Ahead Amounts(UDAA) component of Estimated Aggregate Liability (EAL) calculation to include Real-Time Co-Optimization (RTC) Ancillary Service (AS) Virtual Offers activity Currently: AS Activity is captured in AS Payments and Charges. With RTC: AS Virtual Offers are captured in AS Payments and Charges. ERCOT Protocol Section 16.11.4.3.1 Day-Ahead Liability Estimate Section 4.6.4.1.1, Regulation Up Service Payment; Section 4.6.4.1.2, Regulation Down Service Payment; Section 4.6.4.1.3, Responsive Reserve Service Payment; Section 4.6.4.1.4, Non-Spinning Reserve Service Payment; Section 4.6.4.1.5, ERCOT Contingency Reserve Service Payment; Section 4.6.4.2.1, Regulation Up Service Charge; Section 4.6.4.2.2, Regulation Down Service Charge; Section 4.6.4.2.3, Responsive Reserve Service Charge; Section 4.6.4.2.4, Non-Spinning Reserve Service Charge; Section 4.6.4.2.5, ERCOT Contingency Reserve Service Charge; Other Ancillary Services column will include AS Virtual Offers in UDAA Details for all QSEs of the Counter-Party Section of Estimated Aggregate Liability (EAL) Detail Report . No change to this section. 2 PUBLIC
Revisions to Credit Exposure Calculations for AS Products Related to RTC Update Real Time Liability Completed and Not Settled (RTLCNS) and Real-Time Liability Forward (RTLF) components of Estimated Aggregate Liability (EAL) calculation to include Real-Time Co-Optimization (RTC) Ancillary Service (AS) activity Capture AS Payments and Charges in RTLCNS. Capture AS Payments and Charges in RTLF (150% of AS Payments and Charges). ERCOT Protocol Section 16.11.4.3.2 Real-Time Liability Estimate Section 6.7.5.2, Regulation Up Payments and Charges; Section 6.7.5.3, Regulation Down Payments and Charges; Section 6.7.5.4, Responsive Reserve Payments and Charges; Section 6.7.5.5, Non-Spinning Reserve Payments and Charges; and Section 6.7.5.6, ERCOT Contingency Reserve Service Payments and Charges. Real-Time Ancillary Service Volume(Mwh) and Real-Time Ancillary Service Amount($) columns will be displayed under below highlighted columns in the RTLCNS Details for all QSEs of the Counter-Party Section and RTLF Details for all QSEs of the Counter-Party Section of Estimated Aggregate Liability (EAL) Detail Report . 3 PUBLIC
Revisions to Credit Exposure Calculations for AS Products Related to RTC Update the Minimum Current Exposure (MCE) component of Total Potential Exposure (TPE) calculation to include Real-Time Co-Optimization (RTC) Ancillary Service (AS) activity For virtual offers capture price risk between Day Ahead Market (DAM) Market Clearing Price for Capacity (MCPC) and Real-Time (RT) Market Clearing Price for Capacity (MCPC) Section 16.11.4.1 Determination of Total Potential Exposure for a Counter-Party Extrapolated Net DAM Ancillary Service Only Activities will be displayed under below highlighted columns in the Minimum Current Exposure (MCE) Summary Report 4 PUBLIC
Changes to Default Uplift Supporting Data Reporting Update the Default Uplift Supporting Data Reporting report to include Uplift Day-Ahead Ancillary Service Only Award(UDAASOAWD) Section 9.19.3 Default Uplift Supporting Data Reporting. Uplift Day-Ahead Ancillary Service Only Award will be displayed under below highlighted columns in the Default Uplift Data Report. 5 PUBLIC
