NOTICE DATE:  March 3, 2009
NOTICE TYPE:  M-A011509-02 Operations
SHORT DESCRIPTION:  Valley SPS Modification Proposal
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  Projected March 16, 2009

LONG DESCRIPTION:  ERCOT has reviewed and approved a proposal to modify the Valley Special Protection Scheme (SPS) submitted by Oncor Electric Delivery.  This SPS ramps back and/or trips generation at Valley and Kiamichi in response to various conditions overloading the monitored elements.  The proposed modification will change the arming level on the Anna - Collin 345 kV Line to 2880 Amps from 2280 Amps.  The change was proposed to recognize and utilize 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.


Information regarding this SPS 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]>.
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<http://lists.ercot.com/>.
kd