NOTICE DATE: May 30, 2023

NOTICE TYPE: M-A051923-03 General

SHORT DESCRIPTION: Test of ERCOT.com performance and ERCOT's automated emergency notification system

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: May 30, 2023, 17:00 - 19:00

LONG DESCRIPTION: Today, May 30, ERCOT will conduct a performance test on ERCOT.com as well as a test of its automated emergency notification system. The testing may cause some degradation and slowness for users accessing the site. This test will begin at approximately 5:00 p.m. CPT and will result in the following:

• Temporary change of the "Normal Conditions" display on the Grid Conditions dashboard on ERCOT.com;
• Test message posted to ERCOT's Twitter account;
• Pop-up alert and notification message on the ERCOT mobile app;
• Test message to the Grid Emergency Alerts email distribution list; and
• Test message on the Operations Messages and Public Notices pages on ERCOT.com.

ADDITIONAL INFORMATION: Users may experience minimal impact to performance and functionality during Wednesday's test window, including slower response times. Stay informed with ERCOT messaging by downloading the ERCOT mobile app, subscribing to Grid Emergency Alerts, reviewing ERCOT's Use of Energy Conservation, and viewing the Energy Emergency Alert Communications Matrix.

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.

dg