1. Lead from the front Texas Nodal http://nodal.ercot.com 1 EDS Market Call Bi-Weekly Update Sept 04, 2009

2. Lead from the front Texas Nodal 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. Lead from the front Texas Nodal http://nodal.ercot.com 3 Agenda Anti-trust Admonition Day-to-day operations summary –Planned and Unplanned ERCOT outages of Sandbox –Sandbox Update Standing reports and updates –General Reminders / Updates –SEM go-live update –Focused Input Testing Question and Answers/General Discussion Deep Dive Topic (different topics each meeting as needed) - No Deep Dive this Week 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. Lead from the front Texas Nodal http://nodal.ercot.com 4 Day-to-day operations summary: Planned / Unplanned Outages of EDS Planned Outages –No planned outages to report Unplanned Outages –No unplanned outages to report

5. Lead from the front Texas Nodal Day-to-day Operations Summary: Sandbox Sandbox Current Usage: –Currently 5 (up from 3) QSE’s are using the Nodal Sandbox –As a reminder, the Sandbox currently has the EIS 1.19 –For those who wish to start using this environment, send an email to eds3@ercot.com for details on configurationseds3@ercot.com Reminder: any ERCOT digital certificate may be used to access the sandbox environment –Refer to the first slide in the appendix for information previously discussed on the “retirement” of the ERCOT issued NODALTEST certificates.

6. Lead from the front Texas Nodal Nodal Production – ERCOT Test Certificates Reminder: ERCOT is requesting test digital certificates issued by voluntary MP’s: –Aug 27, 2009 ERCOT released all nodal roles to the production MPIM (Market Participant Identity Management) –ERCOT is asking for volunteer MP’s to generate a certificate for their company containing only these Nodal roles for a user called NODALTEST1 Note that we have placed a 1 on the user to avoid conflicts with the previously used NODALTEST user. –NEW: This user should have the “web services” checkbox checked when creating the certificate –Once created, email the NODALTEST1 certificate to smiddleton@ercot.com Note that Scott Middleton will serve as the central point of control for these certificatessmiddleton@ercot.com –Once we have completed the 168 hour test, MP USA’s may revoke this certificate (ERCOT will also destroy it) –ERCOT would like a core set of certificates in place by October 1, 2009

7. Lead from the front Texas Nodal QSE Information Update Request As we near Market Trials, ERCOT is asking that all QSE’s and TSP’s update needed information Each MP will receive an email by the end of next week directing them to the attached spreadsheet The spreadsheet will have inputs for the following: –Primary / Back-up contact information for each of the functional areas (e.g. DAM, RTM, ICCP, Settlements, CRR….), Accountable Executive, Authorized Rep and Nodal Project Manager We ask that at least 1 back-up be provided for each area There is space to add up to 3 back-ups –Listener URL for notifications sent from ERCOT to MP’s (this is to confirm what we already have on file is correct) –Email address where notification failure alerts will be sent

8. Lead from the front Texas Nodal QSE Information Update Request (continued) When spreadsheet is complete, send to nodalmarkettransition@ercot.com nodalmarkettransition@ercot.com On of the three following people are authorized to update contacts (or documented back-up): –Accountable Executive –Authorized Representative –Nodal Project Manager Any updates to this information during market trials until go live will be updated via this spreadsheet

9. Lead from the front Texas Nodal October Release Update ERCOT will release EIS 1.19 and MMS5 to the market on or before October 28th to the Nodal Production environment As a reminder the following transactions will be supported –Three-Part Supply Offer –Self-Arranged Ancillary Service Quantities –Incremental and Decremental Energy Offer Curves –Ancillary Service Offer –Ancillary Service Trade –Capacity Trade –Congestion Revenue Rights (CRR) Offer –Current Operating Plan (COP) –DC Tie Schedule –DAM Energy Bid –DAM Energy-Only Offer –Energy Trade –Output Schedule –PTP Obligation Bid –Self-Schedule –mRID –SystemStatus –Resource Parameters: ResParametersSet GenResourceParameters ControllableLoadResource NonControllableLoadResource

10. Lead from the front Texas Nodal October Release Update To kick off the Oct – Dec ‘09 connectivity testing, ERCOT will host a workshop on October 8th Topics will include –Market Trials activities –Handbook release plans –Market Readiness Seminar 1 Market Readiness Scorecard Outreach Program Further details will be communicated in an upcoming market notice

11. Lead from the front Texas Nodal http://nodal.ercot.com 11 SEM Go-Live Update SEM Go-Live for TSPs was Monday, Aug 31 8am –130 NOMCRs submitted from 8 TSPs Most concurrent users thus far is 13 ERCOT tested over 50 concurrent connection –25 NOMCRHelp tickets opened Most access issues resolved 1-2 days Two companies had application disconnects –ERCOT released patch last night, Sept 2 at 7pm –Continuing to monitor TSPs beginning to verify network model, and submit changes to ensure consistency and alignment of the model with TSP native systems. –Verification over next 5 months prior to integrated market trials Network Model file is only available to TSPs Model posting for QSEs on agenda for NATF Sept 29

12. Lead from the front Texas Nodal http://nodal.ercot.com 12 SEM NMMS Access on Aug 31, 2009 TSP TML 1)NOMCRs / SAMRs (Report Explorer) 2) CIM network file download capability 3)NMMS Production (also SOTE / MOTE) (links to Citrix Gateway) Citrix Gateway NMMS Production (also SOTE / MOTE) Each TSP Company Folder will contain all Network Model Changes Daily zip files

13. Lead from the front Texas Nodal 6/23/2016 http://nodal.ercot.com 13 This FIT Update includes the following discussion items:  Near-term FIT Windows  FIT III Week 14 Results  Convergence Trends (Running Results Summary for FIT II & FIT III)  Nodal Telemetry Outreach Update  Changes to FIT  Key Dates Standing reports and updates: Focused Input Testing (FIT) Update

14. Lead from the front Texas Nodal http://nodal.ercot.com 14 FIT Update: Near-term FIT Windows Next FIT testing will take place 9/8 – 9/10 (see the September 3 Market Notice) Reminder: remaining FIT windows will only review telemetry and State Estimator convergence. The SCED inputs will be removed from FIT until further notice. The 2009 FIT Calendar is posted at: http://nodal.ercot.com/readiness/eds3/documents/r6/eds_3_lfc_fit3_calendar_2009_v2.ppt ALL TIMES ARE CENTRAL DurationStart date and timeEnd date and time 27 hrs (3x9) Sept 8 - 8:00 AMSept 10 - 5:00 PM 27 hrs (3x9) Sept 22 - 8:00 AMSept 24 - 5:00 PM 27 hrs (3x9) October 6 - 8:00 AMOctober 8 - 5:00 PM 27 hrs (3x9) October 20 - 8:00 AMOctober 22 - 5:00 PM

15. Lead from the front Texas Nodal Key Numbers and Issues:  96% Test Average Convergence; 92% or higher for 24 of 27 Test Hours; 100% for 21 of 27 Test Hours  The majority of issues that arose during the test were attributable to zonal-nodal mismatches as well as unit telemetry missing in nodal.  On Day One, convergence dipped to 77% during Hour Ending (HE) 1400 owing to failed ICCP links.  On Day Two, convergence dipped to 83% during HE 1600 and to 64% during HE 1700 owing to zonal-nodal mismatches and missing nodal telemetry.  The final FIT III Week 14 report is scheduled to post to the Readiness Center on Sept. 8. http://nodal.ercot.com 15 FIT Update: State Estimator - FIT III Week 14 FIT III Assessment reports will be posted at: http://nodal.ercot.com/readiness/eds3/documents/index.htmlhttp://nodal.ercot.com/readiness/eds3/documents/index.html

16. Lead from the front Texas Nodal LFC6/23/2016 FIT SeriesWeekDateDay 1Day 2Day 3Convergence Avg % for all Test Hours 100% Convergence Achieved FIT IIWeek 1Oct 21 – 23, 200890.1874.1691.8385.3912 of 27 hrs Week 2Nov 04 – 06, 200888.1796.5897.1193.9518 of 27 hrs Week 3Nov 18 – 20, 200887.1784.1982.9184.7612 of 27 hrs Week 4Dec 02 – 04, 200896.0493.3393.4494.2714 of 27 hrs Week 5Dec 16 – 18, 200894.7497.4996.3096.1819 of 27 hrs Week 6Jan 13 – 15, 200996.0094.1295.7895.3015 of 27 hrs Week 7Jan 27 – 29, 200994.0790.1393.2992.4914 of 27 hrs FIT IIIWeek 1Feb 24 – 26, 200975.4578.8692.8582.3909 of 27 hrs Week 2Mar 10 – 12, 200996.8292.9798.4196.0720 of 27 hrs Week 3Mar 24 - 26, 200985.4594.9894.7091.7114 of 27 hrs Week 4Apr 07 - 09, 200997.1392.6097.4495.7221 of 27 hrs Week 5Apr 21 – 23, 200987.4789.8795.6591.0008 of 27 hrs Week 6May 05 – 07, 200994.3494.4791.8793.5613 of 27 hrs Week 7May 19 – 21, 200996.8197.3697.0497.0718 of 26 hrs* Week 8Jun 02 – 04, 200988.4784.0993.2988.6210 of 27 hrs Week 9Jun 16 – 18, 200997.4586.1495.5993.0613 of 27 hrs Week 10Jun 30 – Jul 2, 200994.9189.8986.6690.4911 of 27 hrs Week 11Jul 14 – 16, 200991.0184.7097.4991.0614 of 27 hrs Week 12Jul 28 – 30, 200995.9194.7393.6694.7718 of 27 hrs Week 13Aug 11 – 13, 200994.7294.6597.3795.5819 of 27 hrs Week 14Aug 25 – 27, 200996.5193.2599.0796.2821 of 27 hrs FIT Update: Convergence Trends – FIT II & FIT III 16 * One hour was removed from the Week 7 test results to accommodate a nodal database load.

17. Lead from the front Texas Nodal LFC6/23/2016 FIT Update: Nodal Telemetry Outreach 17 Nodal Telemetry Outreach  ERCOT began an Outreach effort on Aug 31.  ERCOT is contacting MPs to correct remaining nodal ICCP telemetry issues in time for Market Trials.  MPs may vet Outreach questions through the EDS3@ercot.com email box (please indicate “Nodal Telemetry Outreach” in the subject line).EDS3@ercot.com Remaining 2009 FIT Windows: Report Initial Progress on EDS Call FIT with Manual Replacements FIT without Manual Replacements Outreach Begins

18. Lead from the front Texas Nodal LFC6/23/2016 FIT Update: Upcoming Changes to FIT 18 Changes to FIT  ERCOT will discontinue Manual Replacements (MRs) during FIT windows.  During FIT III Wk 15 (Sept 8 – 10), ERCOT will stop providing MRs on Day Three of testing.  Starting with FIT III Wk 16 (Sept 22 – 24), ERCOT will discontinue MRs for the duration of the FIT III series. Remaining 2009 FIT Windows: Initial Progress FIT with Manual Replacements FIT without Manual Replacements Outreach Begins

19. Lead from the front Texas Nodal LFC6/23/2016 FIT Update: High-Level View of the ICCP Change Process 19 The TML process for QSE ICCP Service Requests and an example of the ICCP Change Request Form are posted at: http://nodal.ercot.com/readiness/eds1/documents/index.html

20. Lead from the front Texas Nodal http://nodal.ercot.com 20 FIT Update: Current Telemetry Issue Process

21. Lead from the front Texas Nodal LFC6/23/2016 FIT Update: Upcoming Key Dates 21 Upcoming Key Dates √Week of Aug 24 ERCOT distributes a Market Notice to communicate details about the Outreach effort and changes to FIT. √Aug 31 ERCOT begins the Outreach effort. √After Aug 31 MPs may submit Outreach questions to EDS3@ercot.com with “Nodal Telemetry Outreach” in the subject line. EDS3@ercot.com √Sept 4ERCOT shares initial progress for the Outreach effort during the Sept 9 EDS Market Call. Sept 10ERCOT discontinues MRs during FIT windows. Key Dates for Nodal Telemetry Outreach and FIT Changes:

22. Lead from the front Texas Nodal http://nodal.ercot.com 22 Q&A Q&A / Open Forum

23. Lead from the front Texas Nodal http://nodal.ercot.com 23 Appendix

24. Lead from the front Texas Nodal http://nodal.ercot.com 24 NODALTEST Certificates Expiration (originally presented 8/07/09)

25. Lead from the front Texas Nodal Standing reports and updates: Certificates (reminder) NODALTEST Certificate Expirations –All NODALTEST certificates will expire over the next several months –These certificates will not be renewed –In order to continue to test in the sandbox, MP’s may use any valid ERCOT certificate –When the Nodal Production environment is deployed in October, MP’s will use their current (zonal) certificate. –MP USA’s will need to add the appropriate Nodal roles depending on the testing that user will perform –Note: Nodal roles will not have an affect on zonal system usage

26. Lead from the front Texas Nodal http://nodal.ercot.com 26 Creation of the Nodal Implementation Team (originally presented 6/12/09)

27. Lead from the front Texas Nodal Standing reports and updates Program Update – Creation of the Nodal Implementation Team (NIT) –At its June 4, 2009 meeting, TAC created the Nodal Implementation Team (NIT) which will be a vehicle for stakeholder engagement in the Nodal program. –In preparation for the NIT initial meeting, the TPTF email distribution list has been discontinued and has been replaced by the NIT distribution list (NIT@lists.ercot.com)NIT@lists.ercot.com If you were previously subscribed to the TPTF distribution list, no action is needed as TPTF subscribers were automatically migrated to the NIT distribution list. If you were not previously subscribed to the TPTF distribution list and would like to subscribe to the NIT distribution list, please access the ERCOT distribution list management website at http://lists.ercot.comhttp://lists.ercot.com –Meeting materials, agenda, and WebEx information will be distributed as soon as they are available –First Meeting will take place on Monday, June 22, 2009 9:30 am – 4:30 pm –The NIT Charter was distributed via email to NIT@lists.ercot.comNIT@lists.ercot.com The charter is embedded below for your review:

28. Lead from the front Texas Nodal http://nodal.ercot.com 28 Review of Overall Registration Data Project Schedule (originally presented 5/22/09)

29. Lead from the front Texas Nodal http://nodal.ercot.com 29 Review of Overall Registration Data Project Schedule http://nodal.ercot.com 29 Each window will be broken into 3 iterations with heightening levels of data quality goals All non-PUN RE’s will submit during 1 of 2 windows (except Wind) Each non-PUN RE will request one of the two windows between 5/22/09 and 6/5/09 via email to nodalmarkettransition@ercot.comnodalmarkettransition@ercot.com Some RE’s may be moved to a different window based on volume Planning and Protection data will be rolled in for the remaining windows (see next slide) All Wind resources will submit during the second window 2009 MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Private Use Network Transmission Data Collection Window 1 - Non-Wind* RE’s Transmission / Planning / Protection Data Collection - Iteration 1 - Iteration 2 - Iteration 3 - Iteration 1 - Iteration 2 - Iteration 3 Private Use Network Planning and Protection Data Collection Window 2 - Wind RE’s Transmission and Planning / Protection Data Collection - Iteration 1 - Iteration 2 - Iteration 3 MP-10 Phase 2 Final Validation SEM GO-LIVE 8/31 EIS 1.19 to EDS 8/10 85% Prod Quality 95% Prod Quality 98% Prod Quality 85% Prod Quality 95% Prod Quality 98% Prod Quality 85% Prod Quality 95% Prod Quality 98% Prod Quality Kick Off Market Call

30. Lead from the front Texas Nodal Registration Data Collection Update Iteration 3 of the Private Use Network Transmission Data Collection closes on 5/19/09 Current Production Quality Metric is 96.5% (goal is 98% by 5/19) 5/22/09 9:30AM – 11:00AM ERCOT will host a kick off for the next leg of the Nodal Registration Data Collection project Changes to Load Resource Registration The kick off meeting will cover the following topics: –Transmission data collection (review for non-PUNs / non-Wind) –Planning and Protection data review (inclusive of Private Use Networks) –Review of registration activities for the remainder of 2009

31. Lead from the front Texas Nodal http://nodal.ercot.com 31 Nodal API sub-group Report, by Transaction, Completion Confidence (originally presented on 2/6/09)

32. Lead from the front Texas Nodal http://nodal.ercot.com 32 Standing reports and updates: Nodal API sub-group (originally presented on 2/6/09) TPTF Action – Report, by Transaction, Completion Confidence –Each Transaction will be classified into 3 confidence levels –RED – Confidence low – 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.

33. Lead from the front Texas Nodal http://nodal.ercot.com 33 Standing reports and updates: Nodal API sub-group (originally presented on 2/6/09)

34. Lead from the front Texas Nodal http://nodal.ercot.com 34 Standing reports and updates: Nodal API sub-group (originally presented on 2/6/09)

35. Lead from the front Texas Nodal http://nodal.ercot.com 35 Verifiable Cost Submission (originally presented on 4/17/09)

36. Lead from the front Texas Nodal http://nodal.ercot.com 36 Verifiable Cost Submission (originally presented on 4/17) WMS Approved Verifiable Cost Submission Timelines: Simple Cycle Greater than 90MW June 30, 2009 Simple Cycle Less than or Equal to 90MW July 31, 2009 Gas Steam Non-Reheat Boiler Aug 31, 2009 Gas Steam Reheat BoilerSep 30, 2009 Gas Steam Super Critical BoilerOct 31, 2009 Combined Cycle Less than or Equal to 90MW Nov 30, 2009 Combined Cycle Greater than 90MW Dec 31, 2009 Coal, Lignite Jan 31, 2010 Nuclear, Hydro and Renewable Feb 28, 2010 Reciprocating Engines Feb 28, 2010

37. Lead from the front Texas Nodal http://nodal.ercot.com 37 Verifiable Cost Submission ERCOT plans to roll out verifiable cost training: Verifiable Cost Training will cover: –What are Verifiable Costs –What data need to be submitted –Who is required to submit the data forms and supporting information –Where, when and how are Verifiable Costs used Current Plans: –Instructor Led Training during May/June –One session each in Austin, Houston and Dallas Please send any comment to nodaltraining@ercot.comnodaltraining@ercot.com