NOTICE DATE: December 19, 2024

NOTICE TYPE: M-A121924-01 Operations

SHORT DESCRIPTION: 2025 Minimum Monthly Ancillary Service Requirements

INTENDED AUDIENCE: ERCOT Market Participants

DAYS AFFECTED: January 1, 2025

LONG DESCRIPTION: On October 10, 2024, the ERCOT Board of Directors recommended for Public Utility Commission (PUC) approval the 2025 ERCOT Methodologies for Determining Ancillary Service Requirements (“2025 AS Methodology”). On November 21, 2024, the PUC approved the 2025 AS Methodology. The approved changes modify the methodology for determining minimum quantities for Regulation Service, Responsive Reserve Service (RRS), ERCOT Contingency Reserve Service (ECRS), and Non-Spinning Reserve (Non-Spin) Service. ERCOT’s October 10 2024 presentation to the ERCOT Board of Directors provides additional details about these changes. The 2025 AS Methodology will be effective beginning January 1, 2025.

ADDITIONAL INFORMATION: Per the 2025 AS Methodology, the minimum monthly Ancillary Services quantities for 2025 have been posted in the Ancillary Service Requirement Methodology report (EMIL ID NP3-783-M, Report ID 13036) on ERCOT’s website. The posted quantities reflect minimum requirements only. ERCOT will follow-up with a Market Notice if any upward adjustments to these minimum quantities are made.

Note that the 2025 AS Methodology sets the minimum capacity required from Resources providing RRS by using Primary Frequency Response to 1,365 MW. This updated limit will be effective beginning January 1, 2025.

CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at ClientServices@ercot.com.

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