NOTICE DATE: August 19, 2009

NOTICE TYPE: M-A081909-01 PRR

SHORT DESCRIPTION: Implementation of PRR810, Remove McCamey Congestion Management

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: September 1, 2009

LONG DESCRIPTION: PRR 810, Remove McCamey Congestion Management, was approved by the ERCOT Board of Directors on August 18, 2009. Beginning September 1, 2009, ERCOT will no longer be calculating nor posting McCamey Area Transmission Generation Rights (TGRs). The existing 2009 TGRs will be archived to the TGR Archive Postings section on the ERCOT website under https://tcr.ercot.com/default.cfm?func=tcrpostings.

ERCOT will continue to calculate and post the Daily Transmission Limits for the Commercially Significant Constraints (CSCs) and Comision Federal de Electricidad (CFE) DC Tie Limits under the new heading of Daily Transmission Limits on the same website link shown above. This site will continue to reside under the Transmission Congestion Rights website located at http://www.ercot.com/.

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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