NOTICE DATE: May 4, 2023 NOTICE TYPE: M-A050323-02 Unplanned Outage SHORT DESCRIPTION: ERCOT is experiencing ongoing issues which are impacting MMS UI, OS UI and API – Updates on 5/4/2023 INTENDED AUDIENCE: All Market Participants DAY AFFECTED: May 4, 2023 LONG DESCRIPTION: ERCOT is actively troubleshooting the ongoing issues which are impacting Market Management system (MMS) User Interface (UI), Outage Scheduler (OS) UI applications, and API, and will provide updates once available. Reference Market Notice: M-A050323-01 Unplanned Outage 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