NOTICE DATE: February 24, 2026

NOTICE TYPE: M-A021826-02 Reports

SHORT DESCRIPTION: 60-Day SCED Disclosure Report: Missing Telemetered Ancillary Service Capability data for RRS - Supplemental files posted 02/23/2026

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: Operating Day (OD) December 5, 2025 - December 20, 2025

LONG DESCRIPTION: ERCOT has posted the supplemental files for the issues previously communicated in M-A021826-01, regarding the NP3-965-ER 60-Day Security-Constrained Economic Dispatch (SCED) Disclosure Report (Rpt. ID 13052), to the ERCOT website for OD December 5, 2025 through OD December 20, 2025.

All three Supplemental file sets include the previously missed Responsive Reserve Service (RRS) sub-type breakout for telemetered Ancillary Service capabilities.

• 60d_Gen_Resource_Data_in_SCED_02032026_thru_02182026_SUPPLEMENTAL
• 60d_Load_Resource_Data_in_SCED_02032026_thru_02182026_SUPPLEMENTAL
• 60d_ESR_Data_in_SCED_02032026_thru_02182026_SUPPLEMENTAL

ADDITIONAL INFORMATION: As of February 19, 2026, all posted files contain the full sets of data. The supplemental files created and posted February 23,2026 were only for the 3 output files with missing data.  All other output files were unaffected.

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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dg