1. Protocol Revision Subcommittee Presentation to the ERCOT Technical Advisory Committee March 4, 2010

2. PRS Summary 1 PRR for Approval 2 NPRRs for Approval 2 NPRRs for Parking Deck Consideration 0 Rejections 0 Withdrawals Current Discussions

3. Items for a Vote Unanimous Recommendations PRR841, Revise Total ERCOT Wind Power Forecast (TEWPF) NPRR203, Amend Telemetry Bus Accuracy Requirements NPRR156, Transparency for PSS and Full Interconnection Studies with Parking Deck Priority of MEDIUM Non-Unanimous Recommendations NPRR204, Update Generic Startup Cost for Reciprocating Engines NPRR207, Hour Start Unit Deselection and Half Hour Start Unit RUC Clawback with Parking Deck Priority of HIGH

4. PRR841, Revise Total ERCOT Wind Power Forecast (TEWPF) Purpose (L) (Luminant) This PRR revises the probability of exceedance percentage applicable to the Total ERCOT Wind Power Forecast (TEWPF) from 80% to 50% to better reflect the total ERCOT Wind- powered Generation Resource (WGR) production that has been historically experienced. Market Impact N/A System Change NoN/A PRS Vote PRS unanimously voted to recommend approval of PRR841 as amended by the 12/22/09 ERCOT comments. All Market Segments were present. CEO Determination No opinion on necessity prior to go-live Effective Date May 1, 2010

5. PRR841, Revise Total ERCOT Wind Power Forecast (TEWPF) Item Reviewed Description NoImpact Credit Monitoring/ Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

6. NPRR203, Amend Telemetry Bus Accuracy Requirements Purpose(NDSWG) This NPRR proposes a new term, State Estimator Bus, and proposes language changes to Section 3.10.7.5.2, Continuous Telemetry of the Real-Time Measurements of Bus Load, Voltages, Tap Position, and Flows. Market Impact N/A System Change NoN/A PRS Vote PRS unanimously voted to recommend approval of NPRR203 as submitted. All Market Segments were present. CEO Determination Necessary for Go-Live Effective Date Upon Nodal Implementation

7. NPRR203, Amend Telemetry Bus Accuracy Requirements Item Reviewed Description NoImpact Credit Monitoring/ Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

8. NPRR204, Update Generic Startup Cost for Reciprocating Engines Purpose(STEC) This NPRR adds an Operations and Maintenance (O&M) cost for the “Reciprocating Engines” Resource category to the Resource Category Startup Offer Generic Cap determination. Market Impact N/A System Change NoN/A PRS Vote PRS voted to recommend approval of NPRR204 as submitted. There were two opposing votes from the Independent Generator and the Consumer Market Segments and one abstention from the Independent Power Marketer (IPM) Market Segment. All Market Segments were present. CEO Determination Necessary for Go-Live Effective Date Upon Nodal Implementation

9. NPRR204, Update Generic Startup Cost for Reciprocating Engines Item Reviewed Description NoImpact Credit Monitoring/ Liability Budget Staffing Computer Systems Business Functions Grid Operations Impact

10. NPRR156, Transparency for PSS and Full Interconnection Studies Purpose(PSEG) This NPRR proposes updates to Section 1, Overview, to provide transparency to status of Power System Stabilizer (PSS) equipment and interconnection requests. Market Impact N/A System Change N/AN/A PRS Vote PRS unanimously voted to endorse and forward the 4/23/09 PRS Recommendation Report as amended by the 2/11/10 Luminant comments and as revised by PRS to TAC. All Market Segments were present for the vote. CEO Determination Not Necessary for Go-Live PriorityMEDIUM Effective Date Post-Nodal Implementation

11. NPRR207, Hour Start Unit Deselection and Half Hour Start Unit RUC Clawback Purpose(WMS) This NPRR: 1) Creates definitions for Half-Hour Start Units and Hour Start Units; 2) Deselects Hour Start Units from RUC processes except the final Hourly Reliability Unit Commitment before the Operating Hour; and 3) Removes RUC Clawback on all Half-Hour Start Units (a) that participate in the DAM and (b) during Energy Emergency Alert events. Also changes the RUC Clawback on all Half-Hour Start Units that did not participate in the DAM to 50%. Market Impact N/A System Change N/AN/A PRS Vote PRS voted to recommend approval as submitted, and forward to TAC. There was one abstention from the Consumer Market Segment. All Market Segments were present. CEO Determination Not Necessary for Go-Live PriorityHIGH Effective Date Post Nodal Implementation

12. Withdrawals and Rejections None this month

13. Parking Deck Priority NPRR156, Transparency for PSS and Full Interconnection Studies MEDIUM NPRR207, Hour Start Unit Deselection and Half Hour Start Unit RUC Clawback HIGH

14. PRR/NPRR Summary Revision Requests Unanimously Recommended for Approval with No Impacts PRR841, Revise Total ERCOT Wind Power Forecast (TEWPF) NPRR203, Amend Telemetry Bus Accuracy Requirements Revision Requests Not Unanimously Recommended for Approval with No Impacts NPRR204, Update Generic Startup Cost for Reciprocating Engines Revision Requests Unanimously Recommended for Approval with Impacts None this month Revision Requests Not Unanimously Recommended for Approval with Impacts None this month

15. 2010 PRR Approval Cycle – Normal Timeline PRR Posting Deadline PRS Consideration PRS CBA/IA Review TAC Consideration Board Consideration Effective Date 23-Dec21-Jan18-Feb4-Mar23-Mar4/1/10 22-Jan18-Feb25-Mar8-Apr18-May6/1/10 26-Feb25-Mar22-Apr6-May15-Jun7/1/10 26-Mar22-Apr20-May3-Jun20-Jul8/1/10 23-Apr20-May17-Jun1-Jul20-Jul8/1/10 21-May17-Jun22-Jul5-Aug21-Sep10/1/10 25-Jun22-Jul19-Aug2-Sep21-Sep10/1/10 23-Jul19-Aug23-Sep7-Oct16-Nov12/1/10

16. Nodal Parking Deck - Approved by ERCOT Board Source Document TitlePriority Current Status NPRR131Ancillary Service Trades with ERCOTHigh Board Approved 1/19/10 NPRR181FIP Definition RevisionHigh Board Approved 1/19/10 NPRR153Generation Resource Fixed Quantity Block OfferMedium Board Approved 1/19/10 NPRR164Resubmitting Ancillary Service offers in SASMMedium Board Approved 1/19/10 SCR755ERCOT.com Website EnhancementsMedium Board approved 2/16/10

17. Nodal Parking Deck – Pending Approval Source Document Title Suggested Priority Current Status NPRR169 Clarify the Calculation and Posting of LMPs for the Load Zone and LMPs for each Hub High Board remanded to TAC on 2/16/10 NPRR146ICCP Telemetry Information SubmittalsTBD Tabled at TAC PRS approved 2/19/09 NPRR156 Transparency for PSS and Full Interconnection Studies Medium Pending at TAC PRS approved 2/18/10 NPRR207 Hour Start Unit Deselection and Half Hour Start Unit RUC Clawback High Pending at TAC PRS approved 2/18/10 NPRR211 Modify RUC Capacity Short Charge to Use Final Energy Trades TBD PRS remanded to WMS on 2/18/10 SCR756 Enhancements to the MarkeTrack Application TBDTabled at RMS