NOTICE DATE: March 6, 2012 NOTICE TYPE: M-B030612-01 Outage – Retail/Wholesale INTENDED AUDIENCE: All Market Participants DAY AFFECTED: March 6, 2012 from 11:16 to 12:09 DESCRIPTION: Between 10:35 and 11:16, web services became partially unavailable, and market participants using these services saw a degraded response to market submissions and data retrievals. At 11:16, web services became completely unresponsive, preventing submissions and data retrievals. Day Ahead Market (DAM) was manually closed at 11:45. At 12:09, web services were restored, and are fully functional. ERCOT is currently researching the root cause. 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 e-mail at [log in to unmask]<mailto:[log in to unmask]>. If you are receiving e-mail 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<http://lists.ercot.com/>. JR 304637