NOTICE DATE:  January 15, 2009
NOTICE TYPE:  M-A011509-01  Operations
SHORT DESCRIPTION:  Valley SPS Modification Proposal
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  Projected February 16, 2009

LONG DESCRIPTION:  The ERCOT ISO has received a proposal from Oncor Electric Delivery to modify the Valley Special Protection Scheme (SPS).  This SPS ramps back and/or trips generation at Valley and Kiamichi.  The proposed modification would change the arming level on the Anna - Collin 345 kV Line to 2880 Amps from 2280 Amps.  The change is being proposed to recognize and take advantage of the upgrade of the Anna - Collin 345 kV Line which was completed in 2008.  The setting on the Anna - Collin 345 kV Line was established to protect the downstream Collin - NW Carrollton 345 kV Line.
The ERCOT ISO is initiating a review of this Type-1 SPS at this time.  Information regarding this SPS can be viewed on the ERCOT Planning and Operations Information secure website at 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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sg