Texas Reggyional Entity Compliance Report

Texas Regional Entity Compliance Report

Board of Directors January 18, 2010

Overview

December 2009 ERCOT CPS1 Monthly Performance December 2009 ERCOT SCPS2 Monthly Performance November 2009 Resource Plan Performance Metrics for

Non-Wind and Wind Only QSEs Texas RE Stakeholder Outreach NERC Compliance Update Audits Highlight

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ITEM 4A - COMPLIANCE REPORT JANUARY 18, 2010

December 2009 ERCOT's CPS1 Monthly Performance

CPS1 Average

170

170

160

160

150

150

140

140

130

130

120

120

110

110

100

100

Monthly Average

12 Month Rolling Average

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Trend

ITEM 4A - COMPLIANCE REPORT JANUARY 18, 2010

Analysis of CPS1 Monthly Performance

Purpose: To maintain Interconnection steady-state frequency within defined limits by balancing real power demand and supply in real-time

CPS1 is one reliability measure of how well the ERCOT region managed the BPS

ERCOT region's frequency performance is determined by NERC Control Performance Standard 1 (CPS1)

Seasonal fluctuation is expected Scores for individual months can be adversely affected by

events (such as hurricanes) A detailed formula can be found in NERC Reliability

Standard BAL-001-0a

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ITEM 4A - COMPLIANCE REPORT JANUARY 18, 2010

December 2009 SCPS2 Scores: Non-Wind Only QSEs

Percent

100 90 80 70 60 50 40 30 20 10 0

45 Passing Non-Wind QSEs 0 Failing Non-Wind QSE

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ITEM 4A - COMPLIANCE REPORT JANUARY 18, 2009

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