NOTICE DATE:  November 20, 2008

NOTICE TYPE:  M-A112008-01 Operations

SHORT DESCRIPTION:  ERCOT ISO Implementation of the Sandow Switch SPS

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  November 19, 2008

LONG DESCRIPTION:  Oncor Electric Delivery proposed installing a Special
Protection System (SPS) at the Sandow Switch substation.  This SPS
involves initiating a safe shut down of Sandow Unit 4 upon detection of
the loss of the Sandow Switch 345/138 kV Autotransformer.  It also
involves opening the Sandow Switch - Minerva 138 kV Line upon detection
of an overload condition on this line.

The ERCOT ISO has granted provisional approval of this SPS, and as of
17:00 on November 19, 2008 this SPS is now 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
<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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