NOTICE DATE: July 2, 2025

NOTICE TYPE: M-A070225-01 Operations

SHORT DESCRIPTION: Price Correction due to incorrect Real-Time On-Line and Off-Line Reserve Price Adders in SCED

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: June 30, 2025

LONG DESCRIPTION: On June 30, 2025, during a software change deployment for the Market Management System (MMS), a software defect caused an unwarranted drop in Real-Time Online Reserves and Real-Time Offline Reserves, which resulted in an erroneous spike in both the Real-Time On-Line Reserve Price Adder and the Real-Time Off-Line Reserve Price Adder for the Security Constrained Economic Dispatch (SCED) interval 15:40 on Operating Day (OD) June 30, 2025. The software change was rolled back at 16:52 of the same OD.

Upon completion of an impact analysis, ERCOT determined that the impact to prices met the significance criteria in ERCOT Protocol 6.3 for pursuing a price correction for OD June 30, 2025. ERCOT corrected prices for OD June 30, 2025 before the deadline of July 2, 2025 at 4:00PM.

Price Correction files for OD June 30, 2025 have been posted on the Market Information System (MIS).

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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