NOTICE DATE:  September 30, 2009

NOTICE TYPE:  M-A093009-01 Maintenance Outage – NMMS

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

INTENDED AUDIENCE:  TDSPs / TSPs

DAY AFFECTED:  Sunday, October 11, 2009, 9:00 AM – 2:00 PM

LONG DESCRIPTION:  NMMS will undergo a maintenance outage from 9:00 AM until 2:00 PM on Sunday, October 11, 2009. The Network Model Management System, currently supporting the Single Entry Model, will be inaccessible due to monthly 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 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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kd