NOTICE DATE: May 15, 2024

NOTICE TYPE: M-A051524-01 Operations

SHORT DESCRIPTION: Potential Price Corrections - On-Line Reserve Price Adder not included in Real-Time Market Prices

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: April 29, 2024, May 2, 2024, May 7, 2024

LONG DESCRIPTION: On May 9, 2024, ERCOT became aware of an issue with Real-Time Market (RTM) prices in which the Real-Time On-Line Reserve Price Adder (RTORPA) was not being included. This was a result of a planned operating system upgrade project that was deployed on April 29, 2024. After the deployment, RTORPAs were not being successfully populated in the needed table.

On May 13, 2024, ERCOT implemented a fix to ensure RTORPAs were being applied correctly.

Of the Operating Days (ODs) in the timeframe when the issue was ongoing, only April 29, May 2, and May 7, 2024 were impacted due to a RTORPA not being present.

If ERCOT determines that RTM prices qualify for a correction and seeks review of such prices by the ERCOT Board of Directors (Board), ERCOT must notify Market Participants no later than 30 days following the OD; see ERCOT Protocol Section 6.3(7)(a). While ERCOT continues to investigate the impact on RTM prices, this Market Notice is being issued to preserve the eligibility of the Board to review prices for qualifying ODs. ERCOT will provide Market Participants with a follow-up Market Notice with more information concerning pricing impacts and the specific ODs for which ERCOT will be seeking Board review, if any are identified.

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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