NOTICE DATE:  August 27, 2010

NOTICE TYPE:  M-B082710-01 Operations

SHORT DESCRIPTION:  Proposed Disabling of Valley SPS #5 and #6

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  October 4, 2010

LONG DESCRIPTION:  ERCOT has received a request to Disable the Special Protection System (SPS) at the Oncor Valley Plant Switchyard (Oncor SPS # 5 and 6).  Valley SPS-5 protects against overloads on the Collin - Anna; Collin - NW Carrolton; Valley - Anna 345kV lines and the Valley 345/138kV autotransformer.  Valley SPS-6 protects against overloads at Valley - Payne switch circuits 1 and 2; and Payne - Alla Hubbard 138kV lines.  The proposal to disable these SPSs is due to the mothballing of Valley SES generation this fall.

The request to disable these SPSs is being reviewed by ERCOT as described in the SPS Approval Procedure.  Comments on the proposed SPS disabling are due by September 10, 2010 and should be submitted to [log in to unmask]<mailto:[log in to unmask]> using the attached comment form.  Any questions or concerns raised during this timeframe will be addressed by ERCOT staff or the entity submitting the SPS proposal.

Further details of these SPSs can be found in the "Special Protection Systems Information" section of 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]>.

If you are receiving e-mail from an ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.



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