NOTICE DATE: April 21, 2010 NOTICE TYPE: W-B042110-01 Outage SHORT DESCRIPTION: Scheduled Maintenance outage of NMMS INTENDED AUDIENCE: TDSPs/TSPs DAY AFFECTED: Saturday, May 1, 2010, 09:00 - 21:00 LONG DESCRIPTION: The Network Model Management System (NMMS) will undergo a maintenance outage from 09:00 until 21:00, May 1, 2010. NMMS, currently supporting the Single Entry Model, will be inaccessible during that time period. CONTACT: If you have any questions, please forward them to [log in to unmask]<mailto:[log in to unmask]> or 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. dh