NOTICE DATE: February 5, 2009

NOTICE TYPE:  M-A020509-01 Operations

SHORT DESCRIPTION:  Austrop Autotransformers Special Protection System

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  January 30, 2009

LONG DESCRIPTION:  The Austrop Autotransformers Special Protection System (SPS), which has been approved by ERCOT, is in service as of January 30, 2009.  This SPS monitors the loading on the remaining Austrop 345/138 kV Autotransformer for the loss of the other one.  If overloaded, one or both of the 138 kV circuits from Austrop to Decker will be opened as necessary to relieve the overloaded autotransformer.

Information regarding this SPS can be viewed on the ERCOT Planning Operations and 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].

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sg