1. 1 TAC Report to the ERCOT Board February 16, 2005

2. 2 TAC Summary 5 PRRs for Approval 5 PRRs for Approval TAC and Subcommittee Leadership Meeting TAC and Subcommittee Leadership Meeting Reserve Margin Update Reserve Margin Update

3. 3 PRR 547 – Trading Hubs Establishes definitions of trading hubs (specific transmission buses) and process for establishing future trading hubs Establishes definitions of trading hubs (specific transmission buses) and process for establishing future trading hubs Benefits : Benefits : Establishing trading hubs should improve ability to trade beyond the current annual timeframe of congestion zones;Establishing trading hubs should improve ability to trade beyond the current annual timeframe of congestion zones; Trading hubs should improve ability to transact business during the potential transition from a zonal market to a nodal marketTrading hubs should improve ability to transact business during the potential transition from a zonal market to a nodal market PRS recommended approval by 70%; with 2 no votes and 3 abstentions. All market segments were present. Opposing votes from Consumer and Independent Power Marketer segments and abstentions from Independent Generator, Municipal and Independent Power Marketer segment. PRS recommended approval by 70%; with 2 no votes and 3 abstentions. All market segments were present. Opposing votes from Consumer and Independent Power Marketer segments and abstentions from Independent Generator, Municipal and Independent Power Marketer segment. TAC received comments from MOD/ERCOT TAC received comments from MOD/ERCOT TAC approved PRR as amended by PUCT staff with two abstentions. All market segments were present. TAC approved PRR as amended by PUCT staff with two abstentions. All market segments were present. Effective March 1, 2005 Effective March 1, 2005

4. 4 PRR 547 – Trading Hubs Impact Analysis Item Reviewed Description NoImpact Credit Monitoring/Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

5. 5 PRR 548 – Settlement for Mismatched Inter-QSE Energy Schedules Reduces ERCOT BES usage when Inter-QSE trades don’t match Reduces ERCOT BES usage when Inter-QSE trades don’t match Allows ERCOT to settle disputed portion of mismatch at MCPE Allows ERCOT to settle disputed portion of mismatch at MCPE Benefit:Benefit: Should reduce magnitude of settlement dollars and credit risk related to Balancing Energy Market Should reduce magnitude of settlement dollars and credit risk related to Balancing Energy Market PRS recommended approval; with 2 no votes and one abstention. All market segments were present. PRS recommended approval; with 2 no votes and one abstention. All market segments were present. PRS assigned Priority 1.1; Rank 34.5 PRS assigned Priority 1.1; Rank 34.5 TAC unanimously approved with all market segments present. TAC unanimously approved with all market segments present. Effective upon system implementation Effective upon system implementation

6. 6 PRR 548 – Settlement for Mismatched Inter-QSE Energy Schedules Impact Analysis Item Reviewed Description NoImpact Credit Monitoring/Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact Requires Lodestar changes Less than 100K Supports – reduced credit risk

7. 7 PRR 551 – Security Interest Adds provisions to increase Market Participant protection in event of bankruptcy Adds provisions to increase Market Participant protection in event of bankruptcy PRS recommended approval with one no vote and one abstention. All market segments were present. PRS recommended approval with one no vote and one abstention. All market segments were present. Benefit: Benefit: ERCOT credit working group supports because it provides better protection in case of bankruptcy of QSE or TCR account holder. No change to current credit calculation methodology.ERCOT credit working group supports because it provides better protection in case of bankruptcy of QSE or TCR account holder. No change to current credit calculation methodology. TAC approved unanimously with all market segments present TAC approved unanimously with all market segments present Effective March 1, 2005 Effective March 1, 2005

8. 8 PRR 551 – Security Interest Impact Analysis Item Reviewed Description NoImpact Credit Monitoring/Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

9. 9 PRR 552 – Clarification of Relaxed Balanced Schedules Clarifies that QSEs may schedule load or generation even though they do not physically represent load or generation Clarifies that QSEs may schedule load or generation even though they do not physically represent load or generation Benefit: Benefit: Provides greater clarity regarding relaxed balanced scheduling process and removes uncertainty regarding compliance with Commission rulesProvides greater clarity regarding relaxed balanced scheduling process and removes uncertainty regarding compliance with Commission rules In November, PRS recommended approval with two abstentions. All market segments were present. In November, PRS recommended approval with two abstentions. All market segments were present. In December, PRS reviewed ERCOT comments and voted unanimously to amend per ERCOT comments In December, PRS reviewed ERCOT comments and voted unanimously to amend per ERCOT comments TAC unanimously approved with all market segments present. TAC unanimously approved with all market segments present. Effective March 1, 2005 Effective March 1, 2005

10. 10 PRR 552 – Clarification of Relaxed Balanced Schedules Impact Analysis Item Reviewed Description NoImpact Credit Monitoring/Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

11. 11 PRR 566 – Implementation of IDR Optional Removal Threshold Urgent PRR – passage of this PRR will eliminate the project that would implement PRR 479, IDR Optional Removal Threshold – estimated cost savings of 50K due to elimination of ERCOT report Urgent PRR – passage of this PRR will eliminate the project that would implement PRR 479, IDR Optional Removal Threshold – estimated cost savings of 50K due to elimination of ERCOT report This PRR removes need for ERCOT generated report prior to customer requesting removal of IDR meter This PRR removes need for ERCOT generated report prior to customer requesting removal of IDR meter Benefit : Benefit : Allows customers to request removal of IDR meter in accordance with PRR 479 without delay.Allows customers to request removal of IDR meter in accordance with PRR 479 without delay. Cost savings of 50K due to elimination of ERCOT report.Cost savings of 50K due to elimination of ERCOT report. PRS approved urgent status via e-mail vote. PRS approved urgent status via e-mail vote. PRS recommended approval with two abstentions. All market segments were present. PRS recommended approval with two abstentions. All market segments were present. TAC unanimously approved with all market segments present. TAC unanimously approved with all market segments present. Effective March 1, 2005 Effective March 1, 2005

12. 12 PRR 566 – Implementation of IDR Optional Removal Threshold Impact Analysis Item Reviewed Description NoImpact Credit Monitoring/Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

13. 13 Recommended TAC Actions Approval Approval PRR 547 – Trading HubsPRR 547 – Trading Hubs PRR 548 – Settlement for Mismatched Inter-QSE Energy SchedulesPRR 548 – Settlement for Mismatched Inter-QSE Energy Schedules PRR 551 – Security InterestPRR 551 – Security Interest PRR 552 – Clarification of Relaxed Balanced SchedulesPRR 552 – Clarification of Relaxed Balanced Schedules PRR 566 –PRR 566 – Implementation of IDR Optional Removal Threshold

14. 14 TAC and Subcommittee Leadership Meeting Stakeholder leadership and ERCOT representatives met to discuss ERCOT support of TAC and subcommittees, improving communication between TAC and subcommittees, and roundtable discussion regarding goals for 2005 Roundtable Topics of Discussion: –1) 2005 Goals; –2) Operational/Reliability Issues; –3) TAC and Subcommittee Communications w/Board and ERCOT; –4) ERCOT/TAC Policy Roles; –5) Maintaining Focus on Technical Issues; –6) Maintaining Retail Focus at TAC Level; –7) TNT/TAC Interaction Post Filing of Protocols

15. 15 TAC and Subcommittee Leadership Mtg. (cont.) TAC and Subcommittee leadership will continue to meet at least quarterly and review and revise goals 2005 Goals: –Improve communications with ERCOT Board; –Address Reserve Margin and Fuel Reliability Issues; –Review Project List In Anticipation of Potential Nodal Market Implementation

16. 16 Reserve Margin Update ERCOT provided updated reserve margin scenarios at January Board Mtg. ERCOT provided same update at February TAC mtg. TAC created joint ROS/WMS task to review current TAC approved reserve margin calculation assumptions, including treatment of mothballed units Joint task force will report to TAC in March with findings PRR 573 filed “Definition and Treatment of Mothballed Units” –Defines mothballed unit –Defines retired unit –Requires semi-annual reporting on return to service date PRS approved urgent status and will discuss this week If PRR 573 is approved by PRS and TAC will come to Board in March If effective immediately, initial reporting will be due within 30 days TAC will review updated Reserve Margin calculation in May and determine whether or not a plan to address reserve margin in near term is necessary