1. http://nodal.ercot.com 1 Market Trials Outage Scheduling Qualifications Weekly Update February 18, 2010

2. http://nodal.ercot.com 2 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. DISCLAIMER All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure.

3. http://nodal.ercot.com 3 Agenda Anti-trust Admonition Environment Report –Planned / unplanned outages –Known Issues –CIM Load Standing Reports and Updates –General reminders / updates Qualification Update Question and Answers / General Discussion ERCOT asks that Market Participants log into the WebEx session using their company name and then their name. This will allow ERCOT to take roll-call offline

4. Market Trials 2010 Roadmap http://nodal.ercot.com 4

5. http://nodal.ercot.com 5 Environment Report: Planned / Unplanned Outages Planned Outages –No unplanned outages to report Unplanned Outages –No unplanned outages to report

6. http://nodal.ercot.com 6 Environment Report: Known Issues ERCOT will post known issues every Friday to the readiness center at: http://nodal.ercot.com/readiness/markettrials/os/index.html http://nodal.ercot.com/readiness/markettrials/os/index.html New issues and resolved issues will be presented and discussed weekly on this call

7. http://nodal.ercot.com 7 Standing Reports and Updates: General reminders / updates Telemetry outreach status –QSEs 1 point required for State Estimator still missing (~99% complete for nodal telemetry) 8 points required for SCED execution still missing (~99% complete for nodal telemetry) –Load Resources 0 points missing (100% complete for nodal telemetry) –TSPs 356 Circuit Breaker and Load points still missing/unresolved (~95% complete for nodal telemetry) 992 Disconnect points missingthese points represent new requests in the nodal telemetry outreach effort (90% complete for nodal telemetry) Official numbers of missing TSP telemetry is now being reported on the Nodal Readiness Center http://nodal.ercot.com/readiness/markettrials/rtm/index.htmlhttp://nodal.ercot.com/readiness/markettrials/rtm/index.html

8. http://nodal.ercot.com 8 Standing Reports and Updates: General reminders / updates Network Model Update –Successfully applied the network model update 2/17/2010 ~6:30pm –This applies data as of 2/1/2010 –Next two loads are targeted for 3/3/2010 and 3/17/2010 Settlement point and MP short name lists on readiness center –ERCOT will refresh the list of settlement points and short names on the readiness website this evening http://nodal.ercot.com/readiness/markettrials/index.html http://nodal.ercot.com/readiness/markettrials/index.html –Note that these two spreadsheets have been combined into 1 –Reflects the 2/17 network model update –New DRAFT information added to the spreadsheet: Substation to Load Zone mapping per section 3 of the Nodal Protocols Load to NOIE Load Zone mapping Resource Node to Electrical Bus mapping Load Resource to Load Zone mapping

9. http://nodal.ercot.com 9 Standing Reports and Updates: General reminders / updates Update on outage scheduler security issue –Reminder: this vulnerability allows (in remote scenarios) MPs to view another MPs outage information –The vendor has provided a fix for this –This will be applied to the Nodal Production environment on 2/19/2010 Qualification checklist updates / corrections: –Row 23 Stated: Submit Forced Outage on a single piece of transmission equipment Corrected: Submit Forced Outage on a single piece of equipment –Row 25 Stated: Maintenance Level 1 on a group (QSE's w/ only one resource submit single outage) Corrected: Maintenance Level 1 (TSPs and QSEs w/ CC Units, submit a group outage. All other QSEs submit on a single resource) –Updated checklist will post this morning http://nodal.ercot.com/readiness/markettrials/os/index.html http://nodal.ercot.com/readiness/markettrials/os/index.html

10. Qualification Update 18 / 86 QSEs are qualified 1 / 20 TSPs qualified The Outage Scheduler Qualification Dashboard –This is now posted to the readiness center: http://nodal.ercot.com/readiness/markettrials/os/index.html http://nodal.ercot.com/readiness/markettrials/os/index.html –The dashboard will be updated ever Friday at 7pm Outage Scheduler Activity: –We are currently tracking activity in the OS to determine which MPs are working on qualification –Next week, Wholesale Client Services will begin to reach out to MPs to determine where ERCOT can assist with qualifications http://nodal.ercot.com 10

11. http://nodal.ercot.com 11 Q&A Q&A / Open Forum

12. Appendix \ Appendix http://nodal.ercot.com 12

13. http://nodal.ercot.com 13 Environment Report: Changes to Supported Environment Hours Outage Scheduler Environment Availability for February - March 2010 –The Nodal Production Environment will be available Monday – Friday from 8am – 6pm –Outside of these hours, ERCOT will be executing performance testing and patch migrations based on testing results –For those MPs that provided ERCOT test certificates, there will be test notifications sent to your listeners (where applicable) during these internal ERCOT tests –ERCOT will coordinate with MPs when submitting to avoid qualification transactions Please note that only functionality that pertains to the Outage Scheduler qualification activities has been validated and are supported –Other features (such as reports and other MIS functionality) may be present in the environment but may have issues –ERCOT is still in the process of validating features to be released in later Market Trials Phases

14. http://nodal.ercot.com 14 Standing reports and updates: General Reminders / Updates ERCOT has published the Market Trials Phase 3 Handbooks –Outage Scheduler covering Phase 3.0 http://nodal.ercot.com/readiness/markettrials/os/index.htmlhttp://nodal.ercot.com/readiness/markettrials/os/index.html –Real Time Market / LFC covering Phase 3.0 http://nodal.ercot.com/readiness/markettrials/rtm/index.htmlhttp://nodal.ercot.com/readiness/markettrials/rtm/index.html –CRR covering release Phase 3.0 http://nodal.ercot.com/readiness/markettrials/crr/index.htmlhttp://nodal.ercot.com/readiness/markettrials/crr/index.html –Settlements / COMs covering Phase 3.0 http://nodal.ercot.com/readiness/markettrials/coms/index.htmlhttp://nodal.ercot.com/readiness/markettrials/coms/index.html –Day Ahead Market (note that this contains only reference data to the 2.1 qualification as there is no Phase 3.0 scope) http://nodal.ercot.com/readiness/markettrials/dam/index.htmlhttp://nodal.ercot.com/readiness/markettrials/dam/index.html