NOTICE DATE: October 15, 2021

NOTICE TYPE: M-C101521-01 Operations

SHORT DESCRIPTION: Software patch implemented in Day-Ahead Market (DAM) to address identified performance issue

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: Operating Day (OD) October 16, 2021

LONG DESCRIPTION: On September 20, 2021, ERCOT provided notice in Market Notice M-B092021-01, that ERCOT would be temporarily disabling contingency SOKLRI25 in the DAM to address a performance issue caused by the interaction of contingency SOKLRI25 with certain outages, and that a software patch was being developed to correct this identified issue.

This Market Notice is being issued to notify Market Participants that the software patch needed to address this performance issue was deployed beginning with the DAM for OD October 16, 2021.

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 [log in to unmask].

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