NOTICE DATE: May 3, 2023 NOTICE TYPE: M-A050323-01 Unplanned Outage SHORT DESCRIPTION: ERCOT is experiencing ongoing issues which are impacting MMS UI, OS UI and API INTENDED AUDIENCE: All Market Participants DAY AFFECTED: May 3, 2023 LONG DESCRIPTION: ERCOT is experiencing ongoing issues which are impacting Market Management system (MMS) User Interface (UI), Outage Scheduler (OS) UI applications, and API. ADDITIONAL INFORMATION: ERCOT is actively troubleshooting and will provide updates once available. 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]<mailto:[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. dg