1. Lead from the front Texas Nodal http://nodal.ercot.com 1 EDS Market Call Weekly Update Feb 06, 2009

2. Lead from the front Texas Nodal http://nodal.ercot.com 2 Agenda Antitrust Admonition Nodal market activity update –High-level summary of market activities for 2009 in the Integrated Project Schedule QSE/TSP timeline of ongoing Telemetry requirements and issue resolution QSE Resource transmission equipment registration QSE Verifiable cost submissions for resources TSP Single Entry Model Go-Live activities Reporting structure and tools available QSE submission testing and qualification path Day-to-day operations summary –Planned / Unplanned Outages of EDS –Future dates of any system upgrades Standing reports and updates –Focused Input Testing –Nodal API sub-group –Reports/Extracts (first meeting of each month) Q&A Roll-call Deep Dive Topic (different topics each meeting as needed) –Telemetry validation and reporting processes –Current telemetry reports

3. Lead from the front Texas Nodal http://nodal.ercot.com 3 Antitrust Admonition ANTITRUST ADMONITION ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws.

4. Lead from the front Texas Nodal http://nodal.ercot.com 4 Nodal Market Activity Update: EDS and Market Activities 2009 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2009 Verifiable Costs Training on NOMCR Open loop test Submission of Verifiable Costs for Resources (different dates for technologies) Resource Registration PUNS Transmission asset registration Telemetry and SE Focused Input Testing (Telemetry and SE) 7x24 ERCOT monitoring FIT w/ SCED begins All QSEs re-qualify DAM submissions Submission Testing SCED & DAM Publish v1.19 Sandbox v1.19 MMS+v1.19+UI+MPIMSCED submissions begin ** Final dates are available in the Integrated Project Schedule Network Model SEM Go-Live Milestone TSP model synchronization TSP MOD training COMS Extracts User Guide release Reporting “Get Reports” available All other RE’s Transmission asset registration QSEs w/ Res SCED re-qualification NDSML and extract supporting documentation updates

5. Lead from the front Texas Nodal http://nodal.ercot.com 5 Nodal Market Activity Update: EDS and Market Activities 2009 UPDATE: EDS Program Schedule Update –COMPLETE: Preliminary Nodal Integrated Schedule released –COMPLETE: TAC initial review 12/4/08 –COMPLETE: TPTF initial review 12/10/08 3:30-5:30pm (WebEx) Materials: http://www.ercot.com/calendar/2008/12/20081210-TPTFNOD http://www.ercot.com/calendar/2008/12/20081210-TPTFNOD –COMPLETE: TPTF detailed discussion on 12/16 Materials: http://www.ercot.com/calendar/2008/12/20081215-TPTFhttp://www.ercot.com/calendar/2008/12/20081215-TPTF –COMPLETE: TPTF all day workshop on 1/07 Materials: http://www.ercot.com/calendar/2009/01/20090107-TPTFhttp://www.ercot.com/calendar/2009/01/20090107-TPTF –COMPLETE: TPTF session Monday 1/12 in the afternoon continuing Tuesday 1/13 all day Materials: http://www.ercot.com/calendar/2009/01/20090112-TPTFhttp://www.ercot.com/calendar/2009/01/20090112-TPTF –COMPLETE : TPTF session 1/26 – continued discussions on the Nodal Integrated schedule Materials: http://www.ercot.com/calendar/2009/01/20090126-TPTFhttp://www.ercot.com/calendar/2009/01/20090126-TPTF –COMPLETE: TAC Presentation on 2/5 – TPTF has voted the new Nodal Schedule through to TAC –Board Presentation 2/17 – Pending TAC approval, the Board presentation will be the final approval prior to the PUCT

6. Lead from the front Texas Nodal http://nodal.ercot.com 6 Day-to-day operations summary: Planned / Unplanned Outages of EDS Planned Outages –2/12 (12pm – 1pm) – Sandbox CA list will be updated to support Go Daddy CA Unplanned Outages –2/2 2/3 – EDS environment unavailable due to complications with scheduled weekend release –2/3 – current – MIS Reports unavailable – working with vendor to determine root cause

7. Lead from the front Texas Nodal http://nodal.ercot.com 7 Standing reports and updates: Focused Input Testing Update Note that the testing scheduled for 2/10 – 2/12 has been canceled Next testing will take place 2/24 – 2/26 FIT II Assessment reports will be posted at: http://nodal.ercot.com/readiness/eds3/documents/index.html http://nodal.ercot.com/readiness/eds3/documents/index.html Reminder: remaining FIT windows will only review telemetry and state estimator convergence. SCED inputs will be removed from FIT until further notice. ALL TIMES ARE CENTRAL DurationStart date and timeEnd date and time 27 hrs (3x9) February 24 - 8:00 amFebruary 26 - 5:00 pm 27 hrs (3x9) March 10 - 8:00 amMarch 12 - 5:00 pm 27 hrs (3x9) March 24 - 8:00 amMarch 26 - 5:00 pm

8. Lead from the front Texas Nodal http://nodal.ercot.com 8 Standing reports and updates: Nodal API sub-group TPTF Action – Report, by Transaction, Completion Confidence –Each Transaction will be classified into 3 confidence levels –RED – High risk of change in the 1.18 and/or 1.19 releases –YELLOW – Changes should be limited to non-structural changes (e.g. enumeration changes) –GREEN – Any Changes will be limited to defects. –Note that if there are no changes in 1.18 and significant change in 1.19, a transaction will be marked as RED for both. It will retain that color until all changes are complete.

9. Lead from the front Texas Nodal http://nodal.ercot.com 9 Standing reports and updates: Nodal API sub-group Several Changes

10. Lead from the front Texas Nodal http://nodal.ercot.com 10 Standing reports and updates: Nodal API sub-group

11. Lead from the front Texas Nodal http://nodal.ercot.com 11 Q&A Q&A / Open Forum API Sub-Group Reports/Extracts Focused Input Test General EDS

12. Lead from the front Texas Nodal http://nodal.ercot.com 12 Telemetry & State Estimator Overview of Reports, Processes, and Data ERCOT State Estimator & LFC Team Operations Advanced Network Applications Support Feb 06, 2009

13. Lead from the front Texas Nodal http://nodal.ercot.com 13 ICCP Telemetry Support Telemetry Reporting State Estimator Tuning New Telemetry Point Addition Process Telemetry Issue Process Current Telemetry Status Telemetry Status Whereabouts

14. Lead from the front Texas Nodal http://nodal.ercot.com 14 Telemetry Support ERCOT Full Time Staff ICCP Support –Advanced Network Applications Support 2 Engineers –Control Room 1 Operations Analyst & 1 Shift Engineer –IT 2 System Analysts –Additional Staff on a part time basis Market Participants –Contact for Nodal Issues –Timely Response on detected issues

15. Lead from the front Texas Nodal http://nodal.ercot.com 15 Telemetry Reporting QSE & TDSP Dashboard Questions can be sent to eds2@ercot.com eds2@ercot.com

16. Lead from the front Texas Nodal http://nodal.ercot.com 16 Telemetry Reporting Wind Dashboard Resource Entity Coding Green = No Telemetry Issues Not Green = Issues to be corrected Does Data Appear to be ‘Good’? Coding Yes (Green) = Data Quality appears to be good, no action needed No (Red) = Data Missing or of questionable quality corrective action needed Questions can be sent to EDS2@ercot.com

17. Lead from the front Texas Nodal http://nodal.ercot.com 17 Telemetry Reporting If a number other then 0 is in column B, then there is missing telemetry which requires Market Participant Corrective Action. Questions can be sent to EDS2@ercot.com

18. Lead from the front Texas Nodal http://nodal.ercot.com 18 Telemetry Reporting State Estimator (SE) Convergence SE & Supporting Telemetry Information is posted on EDW MIS The link is: https://nodaleds.ercot.com/pps/tibco/mis/Pages /Market+Information/Real+Time+Market https://nodaleds.ercot.com/pps/tibco/mis/Pages /Market+Information/Real+Time+Market Advanced Network Applications provides analysis assistance and be reached at the EDS2 email: EDS2@ercot.com

19. Lead from the front Texas Nodal http://nodal.ercot.com 19 SE Convergence Supporting Information Click on More State Estimator Reports and Extracts

20. Lead from the front Texas Nodal http://nodal.ercot.com 20 SE Convergence Supporting Information Click on More State Estimator Convergence Rate Reports

21. Lead from the front Texas Nodal http://nodal.ercot.com 21 Telemetry Reporting FIT Report Log of Events & Observations –If your company is listed it means that your involvement/assistance was required to resolve an issue. FIT Reports are posted at: http://nodal.ercot.com/readiness/e ds3/documents/index.html http://nodal.ercot.com/readiness/e ds3/documents/index.html Questions can be sent to EDS2@ercot.com

22. Lead from the front Texas Nodal http://nodal.ercot.com 22 State Estimator Tuning FIT –Monitors Telemetry –Compares Generation between Zonal & Nodal ICCP Support Team –Analysis Support of FIT Issues –ICCP Issue Resolution Support –Produce FIT Report

23. Lead from the front Texas Nodal http://nodal.ercot.com 23 New Telemetry Point Addition Process

24. Lead from the front Texas Nodal http://nodal.ercot.com 24 Current Telemetry Issue Process

25. Lead from the front Texas Nodal http://nodal.ercot.com 25 Telemetry Dashboards FIT II Assessment reports are posted at: http://nodal.ercot.com/readiness/eds3/documents/index.htmlhttp://nodal.ercot.com/readiness/eds3/documents/index.html The following Telemetry Dashboards are being posted on the Readiness Center: –Wind Telemetry –Observability –QSER & TSP Telemetry The link for these reports is: http://nodal.ercot.com/readiness/eds1/documents/index.html The Reports are posted each time an update is run. The updates are run after a Nodal database update takes place. (Usually twice a month) Report questions can be sent to EDS2@ercot.com

26. Lead from the front Texas Nodal http://nodal.ercot.com 26 Telemetry Dashboards }

27. Lead from the front Texas Nodal http://nodal.ercot.com 27 Current Telemetry Dashboards As shown to TPTF January 26, 2009 Feb 06, 2009

28. Lead from the front Texas Nodal http://nodal.ercot.com 28 Wind Telemetry

29. Lead from the front Texas Nodal http://nodal.ercot.com 29 Wind Telemetry

30. Lead from the front Texas Nodal http://nodal.ercot.com 30 Wind Telemetry

31. Lead from the front Texas Nodal http://nodal.ercot.com 31 QSE Telemetry

32. Lead from the front Texas Nodal http://nodal.ercot.com 32 TSP Telemetry

33. Lead from the front Texas Nodal http://nodal.ercot.com 33 Load Observability