1. Lead from the front Texas Nodal http://nodal.ercot.com 1 EDS 4 Release 9.1 DAM/RUC/SASM 4.9.1 Market Call January 11, 2008

2. Lead from the front Texas Nodal http://nodal.ercot.com 2 Agenda DAM/RUC EDS 4.9.1 –Brief Review of Objectives –Timeline –Testing Window –Filing Issues –High Level View of Test Cases –QSE Data Preparation –Known Issues –Next Steps –Q&A and Roll Call Appendix –Connectivity and Digital Certificate information

3. Lead from the front Texas Nodal http://nodal.ercot.com 3 DAM/RUC EDS 4.9.1 Overview: Objectives 4.9.1 Objectives of EDS 4.9.1 –Verify QSE’s ability to use either or both the MIS User Interface or Web Services interface as indicated in their sign-up email to perform scenarios specified for the following: CRR Offer (NOIE and PCRR Holders only) PTP Obligation Three-Part Supply Offers for Energy (Only QSE’s w/ Resources) Capacity Trade Energy Trade AS Trade DAM Energy-Only Offer DAM Energy Bid AS Self Arrangement (Only QSE’s with Load) AS Offer (Only QSE’s with Resources) Self Schedule DC Tie Schedule –Verify QSEs understanding of DAM/RUC input validation rules

4. Lead from the front Texas Nodal http://nodal.ercot.com 4 DAM/RUC 4.9.1 Timeline: Reminder of Sandbox Testing

5. Lead from the front Texas Nodal http://nodal.ercot.com 5 DAM/RUC 4.9.1 Timeline: Example Activity Timeline EDS TIMELINE Example Activity Timeline

6. Lead from the front Texas Nodal http://nodal.ercot.com 6 DAM/RUC 4.9.1 Testing: Testing Window QSE’s should have already have signed up via email for a testing window –Testing Window includes: 2 hour support and scripted testing call Resolution of issues during the 2 hour support call 7 day testing window for prioritized support and self guided testing Self guided testing are test scenarios that the QSE has defined and executes independently in the EDS environment –See Appendix for Connectivity/Digital Certificate information –Sign-up email to eds4@ercot.comeds4@ercot.com

7. Lead from the front Texas Nodal http://nodal.ercot.com 7 DAM/RUC 4.9.1 Testing: Support Calls Next week begins… –Individual Support Calls Monday-Thursday every week 2 Time Slots available 9am – 11am and 1pm – 3pm –Fridays Calls are reserved for: Issue Resolution Follow-up calls Market wide status calls Calendar is posted Weekly on the Readiness Center / EDS 4 / Documents: http://nodal.ercot.com/readiness/eds4/documents/index.html http://nodal.ercot.com/readiness/eds4/documents/index.html

8. Lead from the front Texas Nodal http://nodal.ercot.com 8 DAM/RUC 4.9.1 Testing: Support Calls (continued…) QSE’s using Web Services –Will perform all test scenarios on the web services during support call –Will perform a subset of scenarios on the MIS UI independently within 1 week of support call –Once MIS UI scenarios are complete, QSE will notify ERCOT –ERCOT will validate MIS UI submitted transactions QSE’s using the MIS User Interface –Will perform all test scenarios on MIS User Interface during the support call –Validation will take place on the support call

9. Lead from the front Texas Nodal http://nodal.ercot.com 9 DAM/RUC 4.9.1 Testing: Support Call Test Cases * See EDS 4.9.1 DAM / RUC Submissions Test Scripts Document to be posted to readiness 12/21/07 by EOB Reference *Primary QSESub-QSE Create / Query / Update / Cancel (if applicable) CRR OFFERAll Scenarios NOIE / PCRR Holders Only Create Only PTP ObligationAll ScenariosCreate Only Three Part Supply OfferAll Scenarios QSE w/ Resources Only Create Only Capacity TradeAll ScenariosCreate Only Energy TradeAll ScenariosCreate Only AS TradeAll ScenariosCreate Only DAM Energy-Only OfferAll ScenariosCreate Only DAM Energy BidAll ScenariosCreate Only AS Self ArrangementAll Scenarios QSE w/ Load Only Create Only AS OfferAll Scenarios QSE w/ Resources Only Create Only Self ScheduleAll ScenariosCreate Only DC Tie ScheduleAll ScenariosCreate Only

10. Lead from the front Texas Nodal http://nodal.ercot.com 10 DAM/RUC 4.9.1 Tracking: Master Schedule for Next Week

11. Lead from the front Texas Nodal http://nodal.ercot.com 11 DAM/RUC 4.9.1 Tracking: Dashboard To view the most updated copy refer to the readiness center at: http://nodal.ercot.com/readiness/eds4/documents/index.html Under Weekly Status http://nodal.ercot.com/readiness/eds4/documents/index.html

12. Lead from the front Texas Nodal http://nodal.ercot.com 12 DAM/RUC 4.9.1 Tracking: Readiness Metrics Sign-Up Testing Window Scheduled –QSE signs up by 1/4/2008 – Status is GREEN –QSE’s that have not signed up by 01/04/08 – Will turn Amber until signed up 03/15/08 – Will turn red MP8 - QSE Ability to Submit Transactions Via MIS –Expected completion date March 15 MP9 – QSE Ability to Submit Web Service Transactions –Expected completion date March 15 Execution –MP’s that have met readiness metric M8 or M9 by 3/15/08 are GREEN –MP’s that have attempted readiness metric M8 or M9 by 3/15/08 are AMBER –MP’s that have not yet attempted readiness metric M8 or M9 by 3/15/08 are RED MP16 - MP EDS-4 Trials Participation (phase 2) ERCOT is calling all QSEs that have not signed up for EDS4

13. Lead from the front Texas Nodal http://nodal.ercot.com 13 DAM/RUC 4.9.1 Reference: Relevant Documents EDS 4.9.1 – DAM/RUC/SASM Test Package http://nodal.ercot.com/readiness/eds4/documents/index.html Settlement Point Listinghttp://nodal.ercot.com/readiness/eds4/documents/index.html QSE Short Name Listing To post by end-of-day http://nodal.ercot.com/readiness/eds4/documents/index.html Dashboard of Metrics and Schedule http://nodal.ercot.com/readiness/eds4/documents/index.html EDS Issue Submission Form http://nodal.ercot.com/readiness/eds4/documents/r9/ercot_eds_is sue_submission_form.xls EIP External Interface Specification http://nodal.ercot.com/docs/pd/eip/od/misp/eip_external_interface s_specification_v1_06.zip Explanation of Market Submissions v0.25 http://nodal.ercot.com/readiness/eds4/documents/index.html

14. Lead from the front Texas Nodal http://nodal.ercot.com 14 DAM/RUC 4.9.1 Reference: Relevant Documents ERCOT Nodal Transition Plan http://nodal.ercot.com/docs/po/pd/ntp/ERCOT_Nodal_Transition_ Plan_110305.doc EDS 4 Approach v1.0http://nodal.ercot.com/readiness/eds4/documents/index.html EDS 4 - DAM/RUC/SASM Market Participant Handbook v1.0 http://nodal.ercot.com/readiness/eds4/documents/index.html Market Management System User Guide To be provided in next few days be posted to readiness center

15. Lead from the front Texas Nodal http://nodal.ercot.com 15 DAM/RUC 4.9.1 Reference: QSE Data Preparation Download Settlement Points and QSE Short Name List (both files posted on Readiness- http://nodal.ercot.com/readiness/eds4/documents/index.html)http://nodal.ercot.com/readiness/eds4/documents/index.html QSE Short Names used in transactions –Your QSE short name is needed as in XML Header –All QSE short names listed, but may change Can use ERCOT test QSE of “TSTQSE” to avoid populating and changing QSE list in your systems Settlement Point used as points of business in submission testing –Naming examples ->

16. Lead from the front Texas Nodal http://nodal.ercot.com 16 DAM/RUC 4.9.1 Reference: Known issues Known issues will be posted to the Noda Readiness Center under EDS 4: –File will be posted by COB 1/14 –http://nodal.ercot.com/readiness/eds4/documents/index.htmlhttp://nodal.ercot.com/readiness/eds4/documents/index.html User Interface –Performance issues are being encountered

17. Lead from the front Texas Nodal http://nodal.ercot.com 17 DAM/RUC 4.9.1 Reference: QSE Activity Summary If not signed-up for testing, please do: eds4@ercot.comeds4@ercot.com Download and review the EDS 4 Test Package –Send sample XML to ERCOT no less than 2 weeks prior to Testing Window –Make Modifications (if any) to XML’s that ERCOT provides –Prepare final XML files for Support Call Prepare systems with Settlement Point data Read and be familiar with Documents on previous slides Send all questions to eds4@ercot.comeds4@ercot.com

18. Lead from the front Texas Nodal http://nodal.ercot.com 18 Q&A / Open Forum

19. Lead from the front Texas Nodal http://nodal.ercot.com 19 APPENDIX

20. Lead from the front Texas Nodal http://nodal.ercot.com 20 DAM/RUC 4.9.1 Testing: Basic Communications Test (“Ping” Test) (continued….) Prior to this test QSE’s using External Web Services will need to have their network and security teams make the following changes: –QSE’s Market System must be able to access: https://nodaleds.ercot.com:80/2007-08/Nodal/eEDS/EWS/ NOTE: this SSL URL is on port 80 NOTE: this is changed from Release 3.5 https://nodaleds.ercot.com:80/2007-08/Nodal/eEDS/EWS/ –QSE’s must be able to receive messages from 66.128.17.136 –QSE’s must be able to send messages to EDS Environment: 66.128.17.32 Sandbox Environment: 66.128.16.84

21. Lead from the front Texas Nodal http://nodal.ercot.com 21 DAM/RUC 4.9.1 Testing: Basic Communications Test (“Ping” Test) (continued….) QSE’s using MIS User Interface will need to have their network and security teams make the following changes: –Must be able to access: MIS URL: https://nodaleds.ercot.com/pps/tibco/mis/ NOTE: MMS User Interface will have link from MIS NOTE: MIS/MMS UI are on port 443https://nodaleds.ercot.com/pps/tibco/mis/

22. Lead from the front Texas Nodal http://nodal.ercot.com 22 DAM/RUC 4.9.1 Testing: Digital Certificates 1 digital certificate w/ a Generic Userid (NODALTEST) will be Generated for Each QSE and Sub-QSE –The MP’s USA does not need to take any action –This is the only certificate that will work in the EDS environment –This certificate will also work in the Nodal Sandbox environment –It will not work in production, MOTE, or any other ERCOT environment –The Digital Certificate will be sent to the MP USA Distribution will occur after the QSE signs up for a Testing Window and Just Prior to the Support Call –(for those requiring the basic communications test, it will be sent prior to that session) All valid ERCOT issued digital certificates will continue to work in the Nodal Sandbox