1. http://nodal.ercot.com 1 Single Entry Model (SEM) Weekly Market Call July 23, 2009 Matt Mereness

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 SEM Weekly Market Call Agenda Antitrust Admonition SEM Go-Live Update Market Testing and Training Update Readiness Dashboards FAQ Roll-call Questions/Answers Appendix/Supporting Info –What is SEM? –Go-Live timeline and activities –Training overview and sign-up –Dates/ methods to test submissions of NOMCRs –Readiness metrics related to training and testing –Communication mailbox and SEM Market Call Schedule

4. http://nodal.ercot.com 4 SEM Go-Live Update What is ERCOT doing this week? –Conducted fifth class this week –Continue Nodalizing the Zonal Model seed (adding RARF data and other nodal attributes) –July 17 Market Notice to USAs for MPIM Roles for NMMS Role available to assign beginning July 28 NMMS_IMM ERCOT to release details and dates in later notice how/when to assign the roles for SEM Go-Live Training enrollment –Completed session/week 5 of 6 weeks of training –Openings available CIM Model Distribution –Distributed to 6 TSPs –All those that requested the populated CIM XML file to date have received it Communications during the week – NOMCRHelp –No significant issues emailed in from TSPs –Password re-set requests can be sent directly to Helpdesk@ercot.comHelpdesk@ercot.com

5. http://nodal.ercot.com 5 Market Testing & Training Update Communication of requests Training Requests –Sign up using LMS system Training page: http://nodal.ercot.com/training/courses/index.htmlhttp://nodal.ercot.com/training/courses/index.html Enrollment: https://www.ercottraining.com/lms/default.asphttps://www.ercottraining.com/lms/default.asp Dates- June 23-25, June 30- July 2, July 7- 9, 14-16, 21-23, 28-30 Test system access request –Email nomcrhelp@ercot.com for system accessnomcrhelp@ercot.com Populated CIM file request –Request file from nomcrhelp@ercot.comnomcrhelp@ercot.com –Pressing CDs and mailing to TSP upon request

6. http://nodal.ercot.com 6 SEM Go-Live Market Engagement Dashboard TO/TDSP Attendance at any of the SEM Market Calls # of Representatives scheduled to take SEM Training # of TDSP users with access to the test SEM environment # test NOMCRs Submitted by TDSPs to the test SEM environment AEP TEXAS CENTRAL COMPANY XXXX BRAZOS ELECTRIC POWER CO OP INC (TDSP) XXXX BROWNSVILLE PUBLIC UTILITIES BOARD (TDSP) XXX BRYAN TEXAS UTILITIES (TDSP) XXXX CENTERPOINT ENERGY HOUSTON ELECTRIC LLC (TDSP) XXXX CITY OF AUSTIN DBA AUSTIN ENERGY (TDSP) XXXX CITY OF COLLEGE STATION (TDSP) X X CITY OF GARLAND (TDSP) XXX CPS ENERGY (TDSP) XXXX DENTON MUNICIPAL ELECTRIC (TDSP) XXXX GEUS (TDSP) X X GOLDEN SPREAD ELECTRIC COOPERATIVE INC (TSP) XXX LCRA TRANSMISSION SERVICES CORPORATION XXXX ONCOR ELECTRIC DELIVERY COMPANY XXX RAYBURN COUNTRY CO OP DBA RAYBURN ELECTRIC (TDSP) XX RIO GRANDE ELECTRIC CO OP (TDSP) SOUTH TEXAS ELECTRIC CO OP INC XXXX TEXAS MUNICIPAL POWER AGENCY XXX TEXAS-NEW MEXICO POWER CO (TDSP) XXXX WEATHERFORD MUNICIPAL UTILITY SYSTEM XX TEX-LA ELECTRIC CO OP OF TEXAS TOTAL: 18739756

7. http://nodal.ercot.com 7 SEM Go-Live Criteria Dashboard

8. http://nodal.ercot.com 8 SEM Go-Live Criteria and Approval Summary of remaining Stakeholder meeting dates for SEM discussion/approval of Go-Live –August –30-day Market Notice - July 31 –TAC - Aug 6 –ROS - Aug 13 –NDSWG - Aug 18 (under consideration for additional meeting) –ERCOT publishes results and sign-off from Directors – Aug 17 –BOD - Aug 18 –10-day Market Notice - Aug 21 –SEM Go-Live - Aug 31

9. http://nodal.ercot.com 9 FAQ No changes this week User/password (if you cannot remember your user account/password for the ERCOT network). User name is usually first initial last name (eg, John Smith would be jsmith). If you do not remember either, the password will need to be re-set through the ERCOT Helpdesk (the implementation team cannot administer passwords). –Step 1- if you don’t have an ERCOT digital certificate, contact your company’s USA –Step 2- if you can’t remember your user name and/or password EMAIL the ERCOT Helpdesk, Helpdesk@ercot.com First and Last name DUNS number Phone number so they can contact you with the new password Service Level Agreement- the SLA for this NMMS testing platform is business hours Monday- Friday. The systems will be kept available after-hours and weekends, but support of questions and system issues will only be worked during regular business hours. Production system access- this access is only to the test environments. The final environment in August will require additional requests and participation from the USA for your company to assign the appropriate NMMS role.

10. http://nodal.ercot.com 10 Open Issues / Responses Will there be focused ICCP-only training or a guide for SCADA-focused employees? –All TSP users are encouraged to attend the basic training being offered –When this training is complete ERCOT will see if there is a desire of MPs to have specialized training for SCADA assignments to build upon the basic training Can an MP modeler set-up new equipment, and then have another user make the ICCP assignment? –Yes, the same TSP can have one user establish the equipment in a NOMCR, and a different user can edit the NOMCR to complete the SCADA assignments Can ERCOT set-up a read-only role? –By default users are granted read/write privileges –Upon an email request to ERCOT can change the access to be read-only Operatorship vs Ownership Line assignment- Legal working on draft of NPRR Service Level Agreement post SEM Go-Live- –IT support 99.9% availability, 4 hour recovery –Same business support as used for Service Requests –Post SEM Go-Live + 60days window for fall-back to Service Requests –Post SEM Go-Live + 60days window for NOMCRHelp@ercot.comNOMCRHelp@ercot.com MPIM roll-out of roles –Mkt notice today for release July28 of roles to TML NMMS (more coming on dates/details to set-up) Guideline discussion Ongoing- from 500 comments, down to 3 significant discussion- see v0.81 from NDSWG agenda

11. http://nodal.ercot.com 11 Roll-call and Q&A Roll-call Test environment URL –URL- https://gateway.ercot.com/CitrixLogonPoint/Gateway/https://gateway.ercot.com/CitrixLogonPoint/Gateway/ Reminder(s): –Prior to attending training, make sure you can log in successfully to Citrix and can access the application –Training Requests Enroll at https://www.ercottraining.com/lms/default.asphttps://www.ercottraining.com/lms/default.asp –Test system access request Email nomcrhelp@ercot.com for system accessnomcrhelp@ercot.com –Populated CIM file request Email nomcrhelp@ercot.com for CIM filenomcrhelp@ercot.com Pressing CDs and mailing to TSP upon request Friday and Monday Questions and Answers Next Weekly Market Call- July 30, 2009

12. http://nodal.ercot.com 12 Appendix/Supporting Info –What is SEM? –Go-Live timeline and activities –Training overview and sign-up –Dates/ methods to test submissions of NOMCRs

13. http://nodal.ercot.com 13 SEM Go-Live Overview Single Entry Model (SEM) Go-Live is the switchover on Aug 31, 2009 for TSP submissions of network operations model change requests –from “Service Request” submissions via TML –to “NOMCR” submissions via the NMMS System of record for model changes becomes NOMCRs on 8/31//09 System of record for Network operations Model for reliability and dispatch remains Zonal/Genesys system until Dec 2010 TSP Current Activity Submit Modeling Change via Service Request ERCOT Uploads Svc Request into Zonal Genesys Model ERCOT Copies/Converts Zonal Model “seed” Into Nodal NMMS Model TSP Aug 31, 2009 Submit Modeling Change via NOMCR/NMMS Tool (includes ICCP) ERCOT Incrementally Converts NOMCR Into Svc Req Uploads into Zonal Genesys Model ERCOT uploads NOMCR Into Nodal NMMS Model to support nodal testing Data Consistency Checks are run to ensure model synchronization/fidelity Periodic checks are run to ensure model synchronization/fidelity Full Copy Incr. NOMCR

14. 14 Current Network Operations Model Maintenance for TSPs ERCOT Zonal EMMS Model (system of record through 12/1/2010) Submits Service Request to Change Model ERCOT Nodal NMMS Model (nodal testing model- CIM file for EMS/MMS/etc) Periodic full copy and conversion of model (zonal seed used for nodal systems) TSP

15. 15 After 8/31/2009: SEM Go-Live Network Operations Model Maintenance for TSP ERCOT Zonal EMMS Model (system of record through 12/1/2010) ERCOT Nodal NMMS Model (nodal testing model- CIM file for EMS/MMS/etc) ERCOT enters NOMCRs into zonal model ERCOT runs consistency checks to ensure models are aligned and maintained Submits Model Change Request (NOMCR) TSP NMMS Model System of Record Nodal Go-Live 12/1/2010

16. 16 Network Operations Model Maintenance for Resource & QSE (today and post 8/31/09) ERCOT Zonal EMMS Model (system of record through 12/1/2010) ERCOT Nodal NMMS Model (nodal testing model- CIM file for EMS/MMS/etc) ERCOT enters into zonal model NMMS Model System of Record Nodal Go-Live 12/1/2010 Submits RARF (Resource Asset Reg Form) via Service Request Submits ICCP Change via Service Request ERCOT process QSE RE

17. http://nodal.ercot.com 17 SEM Go-Live Update Communication and Calendar –May 6 th ERCOT began TSP outreach through Wholesale Client Services TDSP/TO associations sent to 23 TOs Solicit training headcount from TOs (pre and post Go-Live) Good response from TOs –May 15- Market Notice sent for SEM Kick-off call to occur –May 28- SEM Kick-off WebEx 10:00-11:30am Go-Live timelines and activities for June - August 2009 Training overview and sign-up Dates and access methods to test submissions of NOMCRs Communications mailbox and SEM market call schedule –June 4- Start weekly Thursday SEM Calls at 2-3pm (through go-live/August) Company attendance is recorded ERCOT provide updates on testing and training Highlight issues or Frequently Asked Questions Open Question/Answer session for TSPs Meetings will be posted on new ERCOT calendar page at: http://www.ercot.com/committees/nodal/eds/sem/index http://www.ercot.com/committees/nodal/eds/sem/index –June 8- Testing environment available to TSPs (through Aug 10) –June 22- Weekly classroom training for 6-weeks (through July 30)

18. http://nodal.ercot.com 18 Go-Live timeline and activities (continued) Communication –May 6 th ERCOT began TSP outreach through Wholesale Client Services TDSP/TO associations sent to 23 TOs Solicit training headcount from TOs (pre and post Go-Live) Good response from TOs

19. http://nodal.ercot.com 19 Go-Live timeline and activities (continued) Communication and Calendar –May 15- Market Notice sent for SEM Kick-off call to occur –May 28- SEM Kick-off WebEx 10:00-11:30am Go-Live timelines and activities for June - August 2009 Training overview and sign-up Dates and access methods to test submissions of NOMCRs Readiness metrics related to training and testing Communications mailbox and SEM market call schedule –June 4- Start weekly Thursday SEM Calls at 2-3pm (through go-live/August) Company attendance is recorded ERCOT provide updates on testing and training Highlight issues or Frequently Asked Questions Open Question/Answer session for TSPs Meetings will be posted on ERCOT calendar at http://www.ercot.com/committees/nodal/eds/http://www.ercot.com/committees/nodal/eds/ –June 8- Testing environment available to TSPs (through Aug 10) –June 22- Weekly classroom training for 6-weeks (through July 30)

20. http://nodal.ercot.com 20 Go-Live timeline and activities (continued)

21. http://nodal.ercot.com 21 Go-Live timeline and activities (continued) –Transition periods: June 1- Aug 30, 2009 (objective to minimize SvcReq during this period) –Submit changes as far in advance as possible –No equipment name changes (defer until after SEM Go-Live 8/31/09) Aug 15-30, 2009 –Two weeks no submissions, except for emergency changes Aug 31, 2009 - Feb 2010 (NOMCRs for any/all network changes) –After 8/31/09 TSPs will work to validate the network model and align to their in-house systems –Initially the NOMCR timeline will align with zonal timeline »30-day lead-time, compliant with current zonal database schedulezonal database schedule »Status is tracked and communicated via system emails –Any SRs that did not go into zonal production will be converted by ERCOT to NOMCRs for verification/submission by TSPs in Sept –In 2010 TSPs gradually transition to NodalProtocols(3.10) 90-day timeline submission requirements

22. http://nodal.ercot.com 22 Training Overview and Sign-Up TSP Submission Testing and Training will be the same system/database -Model to be used will be snapshot from October 2008 -Training audience is the TSP network operations modelers/staff Submission Testing system access –Available June 8 – Aug 10 –NOMCR testing system will be on-line and available to all TSPs –ERCOT has established a dedicated email and have staff available to support questions (nomcrhelp@ercot.com)nomcrhelp@ercot.com Training to be hosted in Taylor –Pre-SEM classes June 22 – Aug 3 Current plans for at least six 3-day sessions Planning for 12-18 seats for each class Large dedicated training room –Post-SEM classes Sept 23- Oct 20 Fewer sessions and smaller classes (tbd) Make-up classes, not just-in-time training for all staff after go-live

23. http://nodal.ercot.com 23 Training Overview and Sign-Up (continued) Classroom schedule for the 3-day class One class per week for 6 weeks Start 1pm Tuesday / End noon Thursday Trainees can stay in Lab Thursday afternoon for Q&A If schedule fills up, ERCOT will shorten class to 2-days for the overbooked weeks June 23-25, June 30- July 2 July 7- 9, 14-16, 21-23, 28-30 Next 4 slides show summary of training format and equipment Full training outline in Appendix (no change from last month) Note that testing/training will only include Level 1 Validation Level 1 – Automatic by the system upon submitting. Level 2 – Visual by the N/W Model Coordinator Level 3 – Power flow run on the one NOMCR. Level 4 – Power flow run on all NOMCRs for that day. Level 5 – Power flow run on the AREVA system.

24. Training (continued)

28. http://nodal.ercot.com 28 Training Overview and Sign-Up (continued) Sign-up for access to test environment starts today System access begins June 8 th Email request to nomcrhelp@ercot.comnomcrhelp@ercot.com Test environment requires a valid digital certificate (production or nodaltest) -Digital certificates are to be coordinate with your company’s USA -Include in email: Employee Name- TSP/Company Name- DUNS- Email address- Alternate/Centralized Email address for status change- Primary phone- Alternate phone- Sign-up for training will be discussed next week Weekly slots available for up to 18 participants Looking to leverage LMS/Training system to coordinate and track training Training classes occur each week from June 23 through July