NOTICE DATE: November 5, 2009

NOTICE TYPE: M-A110509-01 Operations

SHORT DESCRIPTION: Change in Transmission Cut-Off dates on Operational System Change Schedule

INTENDED AUDIENCE: TSPs

DAYS AFFECTED: November 17 and December 4, 2009

LONG DESCRIPTION: ERCOT has changed the last two Transmission Cut-Off dates for the 2009 Operational System Change Schedule. A Transmission Cut-Off date represents the last date by which Transmission Service Providers (TSPs) can submit transmission network topology changes to ERCOT in order to be included in the next scheduled Energy Management System (EMS) database load.

The Transmission Cut-Off date changes made are as follows:

Original Date New Date

November 19, 2009 November 17, 2009

December 8, 2009 December 4, 2009

The associated EMS Database Load Dates have not changed.

ADDITIONAL INFORMATION: The Operational System Change Schedule can be viewed at the following link: http://www.ercot.com/gridinfo/transmission/opsys-change-schedule.

CONTACT: If you have any questions, please 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 e-mail at [log in to unmask].

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