3/9/23, 10:35 AM

R-A030323-02 Planned Maintenance Outage - Retail

NOTICE DATE: March 9, 2023

NOTICE TYPE: R-A030323-02 Outage Retail/Wholesale

SHORT DESCRIPTION: Planned Maintenance Outage - Retail

INTENDED AUDIENCE: All Market Participants 

DAY AFFECTED: Sunday, March 19, 2023 from 06:00 to 23:59.

LONG DESCRIPTION: ERCOT will be performing planned maintenance on Sunday, March 19, 2023 from 06:00 to 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.
  • The ListServ GUI may be unavailable and emails sent to the distribution lists could be delayed.

ACTION REQUIRED: During the outage, ERCOT will change the public IP addresses of some Market facing services.  This change could impact Market Participants’ ability to access those services or receive responses from them. 

NOTE: All Market Participants that transmit files via NAESB must ensure their systems can send and receive transactions from the new IP addresses.

The specific changes to the services are listed below:

NAESB URL no change

IP Configurations

Former Public IP Addresses

Outbound from ERCOT -

New Public IP Addresses

Outbound from ERCOT -

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

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