NOTICE DATE:  April 19, 2013

NOTICE TYPE:  M-A041913-01 Operations

SHORT DESCRIPTION:  Proposal to Disable Austrop Auto SPS

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  May 3, 2013

LONG DESCRIPTION:  ERCOT received a proposal to disable the Austrop 138/345 kV autotransformer Special Protection System (Austrop Auto SPS) from Austin Energy (AEN).  The installation of a 138/345 kV 672 MVA autotransformer at the Dunlap substation, with an expected in-service of July 11, 2013, will allow the disabling of the Austrop Auto SPS.  The Austrop Auto SPS was designed to protect loading of the Austrop autotransformers.

The proposal to disable the Austrop Auto SPS is being reviewed by ERCOT.  Comments on the proposal are due by May 3, 2013 and should be submitted to [log in to unmask]<mailto:[log in to unmask]> using the attached comment form.  Any questions or concerns raised during this timeframe will be addressed by ERCOT Staff or the entity submitting the SPS proposal.

Further details of this SPS can be found on the MIS (requires an ERCOT digital certificate):

https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/Long+Term+Planning

ACTION REQUIRED:  Any comments to this proposal are due to ERCOT by May 3, 2013 using the attached form.

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 email at [log in to unmask]<mailto:[log in to unmask]>.

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