NOTICE DATE:  September 11, 2009

NOTICE TYPE:  M-C091109-01 Maintenance Outage – NMMS

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

INTENDED AUDIENCE:  TDSPs / TSPs

DAY AFFECTED:  Sunday, September 13, 2009, 12:00 PM – 8:00 PM

LONG DESCRIPTION:  As part of the Taylor Control Center (TCC) Data Center expansion project, ERCOT has scheduled server maintenance that will result in an outage for all NMMS services on Sunday, September 13, 2009, from 12:00 PM until 8:00 PM.

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