NOTICE DATE: July 11, 2025

NOTICE TYPE: R-A071125-01 Outage Retail/Wholesale

SHORT DESCRIPTION: Updated Date - Planned Maintenance Outage - Retail

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: Saturday, July 26, 2025 14:00 through Sunday, July 27, 2025 23:59

LONG DESCRIPTION: ERCOT will be performing planned maintenance on Saturday, July 26, 2025 14:00 through Sunday, July 27, 2025 23:59. During the outage the following functions will be affected:

• Market Participants utilizing NAESB to send/receive transactions to/from ERCOT will NOT be able to send/receive transactions to/from ERCOT during the outage. This includes all retail transactions.
• 867 transactions will NOT be forwarded during the outage.
• 997 Functional Acknowledgements will NOT be sent during the outage.
• MarkeTrak will be unavailable for the duration of the outage.
• Retail Application components of the MIS and the Retail API will be unavailable.
• Retail Reports and Extracts may be impacted during the outage timeframe.
• eService application will be unavailable on the Market Information System (MIS).
• Find ESIID and Find Transaction will be unavailable.

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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