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] 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].

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dh