NOTICE DATE: May 24, 2024

NOTICE TYPE: M-C052424-01 Operations

SHORT DESCRIPTION: Price Impact Analysis - 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 observed following 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.

Further analysis was performed, and it was determined that the impact to the RTM did not meet the significance criteria for bringing a price correction to the ERCOT Board of Directors (Board) for review.  The criteria, set forth in Protocol section 6.3(7)(b), states that ERCOT shall ask the Board to review prices if the absolute value impact to any single Counter-Party is greater than:

(i) 2% and also greater than $20,000; or

(ii) 20% and also greater than $2,000.

Of the Counter-Parties with an impact of 2% or greater, the largest absolute dollar impact was approximately $0.20.

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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dg/mm