NOTICE DATE: January 7, 2009 NOTICE TYPE: M-B010709-01 Operations SHORT DESCRIPTION: Benbrook Autotransformers SPS Proposal INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: Proposed start in May 2009 LONG DESCRIPTION: The ERCOT ISO has received a proposal from Oncor Electric Delivery for two new Special Protection Schemes (SPS) on the 345/138 kV Autotransformers at the Benbrook Switching Station. The SPSs are series reactor insertions into the 138 kV sides of the Autotransformers. The ERCOT ISO is initiating a review of these Type-2 SPSs at this time. Information regarding SPSs can be viewed on the ERCOT Planning and Operations Information 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/>. sg