NOTICE DATE: September 25, 2025

NOTICE TYPE: M-B092525-01 Operations

SHORT DESCRIPTION: ERCOT Board approval of Day-Ahead Market (DAM) Price Corrections

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: June 27, 2025

LONG DESCRIPTION: On September 22, 2025, the ERCOT Board of Directors (ERCOT Board) reviewed price corrections for an event that involved an incorrect limit for the Generic Transmission Constraint Sam Switch (SAMSW) that affected the Day-Ahead Market (DAM) for Operating Day (OD) June 27, 2025 . See Market Notice M-C072525-01.

The ERCOT Board determined that prices were significantly affected and directed ERCOT to implement the appropriate price corrections pursuant to ERCOT Protocol Section 4.5.3 for the DAM.

ERCOT Board approval of these price corrections necessitates the issuance of DAM Resettlement Statements. A subsequent Market Notice will be posted for the DAM resettlements in accordance with ERCOT Protocol Section 9.2.6.

ADDITIONAL INFORMATION: The corrected prices will be posted in both CSV and XML formats under the DAM Price Corrections section of the Market Prices webpage on ERCOT.com

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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