***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: March 26, 2018 NOTICE TYPE: M-A032618-01 General SHORT DESCRIPTION: Planned System Communication Test INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: March 29, 2018, 15:30 - 16:00 LONG DESCRIPTION: ERCOT will be conducting an emergency communications system test on Thursday, March 29, 2018 between 15:30 - 16:00. During this time, users may receive messages that indicate a test is in process. Other results will include the following: ********* Pop-up alert on the ERCOT Mobile app ********* Test message to the Emergency Notification System (ENS) email distribution list ********* Test message on the Operations Messages<http://www.ercot.com/services/comm/mkt_notices/opsmessages> page on ERCOT.com ********* Temporary change of the Grid Condition Normal Conditions Spotlight on ERCOT.com ********* Test message to Twitter ACTION REQUIRED: No action is required. 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. sa