NOTICE DATE: January 31, 2024

NOTICE TYPE: M-A013124-01 Settlements

SHORT DESCRIPTION: Day-Ahead Three-Part Offers (TPOs) not properly transferred to the Settlement System

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: October 24, 2023 - November 1, 2023

LONG DESCRIPTION: ERCOT has identified an issue in the transfer of Day-Ahead Three-Part Offer (TPO) data from the Market Management System (MMS) to the Settlement System during Operating Days October 24, 2023 through November 1, 2023. This issue is related to the MMS submission issues on October 22, 2023. (See previous related Market Notices:M-A102223-01, M-A102223-02, and price correction Board approval - M-B102423-01)

The Day-Ahead TPOs that were transferred to Settlements did not contain the most recent data used in the Day-Ahead Market (DAM) clearing process. The data transfer issue of Day-Ahead TPOs was not impacted beginning from Operating Day November 2, 2023 and MMS enhancements were subsequently implemented.

To determine whether resettlement was appropriate, a resettlement analysis was conducted on the nine Operating Days affected. It was determined that none of the impacted Operating Days met the resettlement threshold as specified in paragraph (2) of Protocol Section 9.2.5, DAM Resettlement Statement. Eight of the nine Operating Days analyzed did not have a financial impact. One Operating Day had a maximum impact to a Market Participant of approximately $1,200.

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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