NOTICE DATE:  September 16, 2009

NOTICE TYPE:  W-A091609-01 Outage

SHORT DESCRIPTION:  Network Model Management System (NMMS) outage scheduled for September 16, 2009, at 7:00 PM

INTENDED AUDIENCE:  TDSPs/TSPs

DAY AFFECTED:  Wednesday, September 16, 2009, 7:00 PM - 8:00 PM

LONG DESCRIPTION:  The Network Model Management System (NMMS) will undergo an outage from 7:00 PM until 8:00 PM tonight, Wednesday, September 16, 2009. The Network Model Management System, currently supporting the Single Entry Model, will be taken offline to apply an emergency software patch to address XML import issue. The outage is expected to be less than one hour, and the system will be brought online upon completion of the maintenance.

A subsequent notice will be sent if the maintenance period, for unforeseen reasons, exceeds the communicated end time.

CONTACT:  If you have any questions, please contact [log in to unmask] or 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].

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