NOTICE DATE: April 15, 2010

NOTICE TYPE: M-B022210-02 Operations

SHORT DESCRIPTION: Approval to Disable Stanton East SPS #23 and install Stanton East SPS #46

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: May 5, 2010

LONG DESCRIPTION: ERCOT has received a request to disable the Special Protection System (SPS) at the Oncor Stanton East substation (Oncor SPS #23) and replace it with a new SPS at Stanton East (Oncor SPS #46). The exiting SPS is intended to protect against overloads on the Stanton East – Midland East and Stanton East – Big Spring 138 kV lines. The replacement SPS is intended to protect against overloads on the Stanton East – Midland East 138 kV line and is temporary until Competitive Renewable Energy Zone (CREZ) lines are tied into the Odessa Extra-High Voltage (EHV) Switching Station.

ERCOT has completed its review and has approved the proposal to disable the existing Stanton East SPS (Oncor SPS #23) and install the new Stanton East SPS (Oncor SPS #46).

Further details on these SPSs can be found in the “Special Protection Systems Information” section of the ERCOT 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 Services via email at [log in to unmask].

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