NOTICE DATE:  June 7, 2010

NOTICE TYPE:  M-A041610-02 Operations

SHORT DESCRIPTION:  Sandow Switching Station SPS #40 and #43 to be disabled

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  June 15, 2010

LONG DESCRIPTION: Oncor submitted a proposal to disable the Sandow Switching Station SPS #40 and #43 at the Sandow Switching Station. SPS #40 protects against overloads on the Sandow – Minerva 138kV line. SPS #43 protects against overloads on the Sandow – Taylor; Sandow – Elgin; Elgin – Gilleland 138kV lines and the 345/138kV Autotransformer #1.

Effective June 15, 2010, these SPSs will be disabled. Information regarding SPSs is located in the “Special Protection Systems Information” section of the Planning and Operations Information secure 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 Relations via email at [log in to unmask].

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