Portfolio Performance January-mid October 2006

1. Portfolio Performance January-mid October 2006 Energy and Market Management Texas Market Link Settlements and Billing Market Oversight EDW/Business Intelligence Monitoring System and Market Operations Market Oversight Division Qualified Scheduling Transmission Service Providers Entities Systems Stakeholders Q4 ’05 Q1 ’06 Q2 ‘06 Q3 ‘06 Q4 ‘06 Q1 ‘07 Release SO 4A and 4B SO 5A Release SO 5C SO 5B Release SO 6B1 Release SO 6B2 • Release 4A (2004 Carry) • 30161 PRR413 - Optimization for the Whole Operating Day in RPRS Procurement Process (1.1) • 40072 PUCT Add Corrected MCPEs to the MOS dbase and pass to MMS (1.1) • Release 4b (2004 Carry) • 40098 Perf Monitoring for SCADA/SE (1.0b) • 40113 RAP-C Modeling Enhancements (1.0b) • 40084 Outage Scheduler Phase II (1.0a)Cancelled • 40086 Incident Report (1.0a) • 30084 CSC Thermal and Voltage Limit Calcs (1.0a) • 40100 RTCA Archiving (1.0b) • SO 5A • 30021 Replace DSM6 High Speed Freq Rec (1.1b) • 50002 Enhancements to MOMS ISR (1.0a) • SO 5B (2005 Carry) • 50050 Satellite Communication for Black Start Suppliers (1.3) • 50008 PRR502 Aggregation of Combined Cycle Units (1.0b) • 40090-01 Operator Training Center (1.0a) • SO 5C (2005 Carry) • 30105 Congestion Management Reports (1.0b) • 50135 Topology Estimation System Phase 1 (1.1a) • 50136 EMMS Software Upgrade – OSI PI, OAG (1.1b) • 50151 Additional SMP Front End • 50021 Improve Reliability of Freq Input (1.0b) • 50005 EDW EMMS Extracts (1.0a) • Release 6B1 • 60002_01 Increase Number of Seats for Study MCE (1.1a) • 50083_01 Breaker to Breaker one lines map (1.1b) • 60080_01 SCR747 Removal of Price Admin for Zonal Cong (1.1) and 60079_01 Upgrade of ERCOT MCE Software to AIMMS 3.6 (1.1) • 50003 Enhancements to MOMS Study MCE (1.0a) • Release 6B2 • 50029 Improvement of VSA/DSA – Phase 2 (1.0b) • 60001_01 EIS BI Foundations III (1.1) • 40090-02 Operator Training Simulator (1.0a) • 60082_01 SCR746 Dynamic Rating Data through ICCP (1.1) • 60081_01 15 Minute Ramping for BES and Base Power Schedule (1.1) • 60084_02 Mid Term Load Forecast Enh Ph 2 (1.1) Active (at least in Initiation) New or Not Started Completed SO DPO Sponsor Update/Review November End 2006

2. Portfolio Performance January-October 2007 Energy and Market Management Texas Market Link Settlements and Billing Market Oversight EDW/Business Intelligence Monitoring System and Market Operations Market Oversight Division Qualified Scheduling Transmission Service Providers Entities Systems Stakeholders Q4 ’06 Q1 ’07 Q2 ‘07 Q3 ‘07 Q4 ‘07 Q1 ‘08 Release 4B Release 5C Release 6B2 Release 7A • Release 4b (2004 Carry) • 30084 CSC Thermal and Voltage Limit Calcs • Release 7A • 50052_01 Operations Support Study Environment • 40085_01 Performance Monitoring for ERCOT, TDSP, & QSE • 50038_01 Generator Database Automation • 50071_01 Governor Analysis Enhancements • 50093_01 Outage Coordination Statistical Reports • 50055_01 Voltage/Reactive Compliance Management Database • 50070_01 Unit Testing-Electronic Submittal via Web • Release 5C (2005 Carry) • 50021 Improve Reliability of Freq Input • 50130 SCE Performance and Monitoring (1.1a) • 50134 DC Tie Automation • 60084_01 Mid Term Load Forecast Enh Ph 1 (1.1) • Release 6B2 • 60081_01 15 Minute Ramping for BES and Base Power Schedule • 60082_01 SCR746 Dynamic Rating Data through ICCP • 50029 Improvement of VSA/DSA – Phase 2 • 40090-02 Operator Training Simulator • 60084_02 Mid Term Load Forecast Enh Ph 2 Active (at least in Initiation) New or Not Started Completed SO DPO Sponsor Update/Review November End 2006