NOTICE DATE:  February 24, 2010

NOTICE TYPE:  W-A022410-01 Outage

SHORT DESCRIPTION:  Scheduled Maintenance outage of the Network Model Management System (NMMS)

INTENDED AUDIENCE:  TDSPs / TSPs

DAY AFFECTED:  Wednesday, February 24, 2010, 8:00 PM – 9:00 PM

LONG DESCRIPTION:  NMMS will undergo a maintenance outage from 8:00 PM until 9:00 PM, February 24, 2010. The Network Model Management System, 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