NOTICE DATE: July 25, 2025
NOTICE TYPE: M-C072525-01 Operations
SHORT DESCRIPTION: Potential Price Correction - Incorrect Generic Transmission Constraint Limit used in the Day-Ahead Market
INTENDED AUDIENCE: All Market Participants
DAYS AFFECTED: June 27, 2025
LONG DESCRIPTION: For Operating Day (OD) June 27, 2025, the Day-Ahead Market (DAM) used an incorrect limit for the Generic Transmission Constraint SAMSW (Sam Switch). As a result of outage conditions, the limit should have been set to 431 megawatts (MW); however, a software malfunction resulted in the limit being erroneously set to 9999 MW.
ERCOT will conduct an impact analysis to determine if this event meets the criteria for seeking approval from the ERCOT Board of Directors for a price correction.
According to ERCOT Protocols Section 4.5.3(6)(b), for ERCOT to seek approval for a price correction, the absolute value impact to any single Counter-Party in the DAM must be greater than one of the following criteria:
- 2% and also greater than $20,000 (Protocol Section 4.5.3(6)(b)(i)); or
- 20% and also greater than $2,000 (Protocol Section 4.5.3(6)(b)(ii)).
A follow- up notice will be issued once the impact analysis is completed.
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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