NOTICE DATE: January 22, 2010

NOTICE TYPE: M-A080409-03 Operations

SHORT DESCRIPTION: Eskota Switching Station SPS in service

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: January 21, 2010

LONG DESCRIPTION: Oncor Electric Delivery submitted a proposal for a new Special Protection System (SPS) at Eskota Switching Station. This SPS is intended to protect against post-contingency overloading on the Eskota – South Abilene 138 kV line, the Eskota 138/69 kV Autotransformer or the Eskota – NW Abilene 69 kV line that may occur due to changing generation patterns.

Effective January 21, 2010, this SPS is in service.

Information regarding this SPS can be located in the “Special Protection Systems Information” section of the Planning and Operations Information secure website: http://planning.ercot.com/login/login.

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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