NOTICE DATE:  December 7, 2011

NOTICE TYPE:  W-A100311-03 Operations

SHORT DESCRIPTION:  Additional time needed for final determination of RMR status for Luminant Generation Company LLC, Monticello Units 1 and 2

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  December 7, 2011

LONG DESCRIPTION:  ERCOT received Notification of Suspension of Operations (NSO) on October 3, 2011, for the following Generation Resources:

*       Luminant Generation Company LLC - MNSES_UNIT1
*       Luminant Generation Company LLC - MNSES_UNIT2

On October 28, 2011, ERCOT issued Notice W-A100311-02 indicating that its initial determination required further analysis to determine if the Resources would be needed for Reliability Must-Run (RMR) Service and that a final determination would be issued by December 7, 2011.

Due to recent changes on the ERCOT System that impact the RMR analysis, and due to the receipt of additional data from the impacted Transmission Service Provider, Oncor Electric Delivery Company LLC, ERCOT requires additional time to assess the transmission system reliability impacts of the suspension of operations of Monticello Units 1 and 2. ERCOT will issue its final determination no later than December 19, 2011.

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 email at [log in to unmask]<mailto:[log in to unmask]>.

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