NOTICE DATE: April 13, 2023

NOTICE TYPE:  M-B041323-01 Unplanned outage - ERCOT websites

SHORT DESCRIPTION: ERCOT experienced an unexpected outage affecting all ERCOT websites

INTENDED AUDIENCE: All Market Participants, User Security Administrators (USAs), Resource Entities

DAYS AFFECTED: April 13, 2023 3:55pm - 4:55pm

LONG DESCRIPTION: ERCOT experienced an unexpected outage affecting all ERCOT websites. Market Participants may have experienced failure to connect errors during this time.  All data received has been processed as expected but Market Participants are encouraged to verify any transactions exchanged during that time were subsequently processed.

ADDITIONAL INFORMATION: The system impacted include *.ercot.com. This includes, but is not limited to,the following business applications:

NAESB (3:56PM - 4:22PM)

ListServ

ERCOT Market Information Systems (MIS)

RIOO

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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dsl/dg