NOTICE DATE: May 12, 2023

NOTICE TYPE: R-A042823 -03 Outage Retail/Wholesale

SHORT DESCRIPTION: Planned Maintenance Outage - Retail - RESCHEDULED

INTENDED AUDIENCE: All Market Participants 

DAY AFFECTED: Sunday, May 21, 2023 from 06:00 to 23:59.

LONG DESCRIPTION: ERCOT will be performing planned maintenance on Sunday, May 21, 2023 from 06:00 to 23:59 that had previously been scheduled for May 14, 2023.  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.

IMPORTANT: New Imperva IP addresses

New IPv4 address space is being added to support our growing network footprint. The new address range is 131.125.128.0/17 (131.125.128.1-131.125.255.254.) These new addresses may be deployed in an Imperva PoP beginning May 19th, 2023.
What does this mean for you? If you use an allowlist, firewall, or ACL to limit direct access to your origin server, you must update your allowlist to permit the new 131.125.128.0 /17 before May 19th. If you don't permit the new IPs, you may experience a site outage after that date, as any Imperva devices using the new IP space will be unable to access your server. For more information, please visit https://docs.imperva.com/howto/c85245b7.

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].

If you are receiving email from a public ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.

mm