NOTICE DATE:  May 4, 2009

NOTICE TYPE:  M-A050409-01 Operations

SHORT DESCRIPTION: Eskota Switching Station SPS Proposal

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED:  Proposed in-service June 12, 2009

LONG DESCRIPTION:  Oncor Electric Delivery has 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. ERCOT is currently initiating a review of this Type-1 SPS. Information regarding SPSs can be viewed on the ERCOT 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]<mailto:[log in to unmask]>.

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