NOTICE DATE: September 21, 2015 NOTICE TYPE: M-A092015-04 Unplanned Outage SHORT DESCRIPTION: Unplanned Outage of some ERCOT systems – Fail-over complete INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: September, 21, 2015 LONG DESCRIPTION: ERCOT completed the controlled fail-over at 19:37. 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 an 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. mm