NOTICE DATE: August 17, 2009 NOTICE TYPE: M-A081709-01 Operations SHORT DESCRIPTION: Whitney SPS in service INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: June 30, 2009 LONG DESCRIPTION: ERCOT approved a proposal from Brazos Electric for a new Special Protection System (SPS) for the Whitney transformer on April 13, 2009, per Market Notice M-B030509-02. This SPS is intended to protect against overloading on the Whitney 345/138 kV transformer that may occur with the loss of the Bosque Switch - Elm Mott 345 kV Line and high dispatch of 345 kV generation at the Bosque Switching Station. As of June 30, 2009, this SPS is in-service. Further details of the Sandow Switch SPS can be found in the "Special Protection Systems Information" section of the Planning and Operations Information secure website at the link below. 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/>. dh