NOTICE DATE: October 17, 2025

NOTICE TYPE: M-A101725-01 Outage Retail/Wholesale

SHORT DESCRIPTION: Planned Maintenance Outage - Retail

INTENDED AUDIENCE: TDSPs and LSEs

DAYS AFFECTED: Thursday, October 23, 2025, from 16:30 to 17:30

LONG DESCRIPTION:  ERCOT will be performing planned maintenance on Thursday, October 23, 2025, from 16:30 to 17:30. During the outage, the following functions may be affected:

• MarkeTrak will be the only Retail system experiencing a potential outage during this time.

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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