NOTICE DATE: March 4, 2009 NOTICE TYPE: M-A030409-01 Operations SHORT DESCRIPTION: March 5, 2009 AS Market Cleared INTENDED AUDIENCE: QSE Operations Personnel DAY AFFECTED: Operating Day March 4, 2009 LONG DESCRIPTION: On March 4, 2009 the Day Ahead Ancillary Service (AS) Market Engine initially failed to clear for the Operating Day of March 5, 2009. At approximately 16:20 the Day Ahead AS Market was re-run and successfully cleared. ERCOT is investigating the issue and will provide more information at the appropriate Working Group as it becomes available. 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/>. ad