1. Lead from the front Texas Nodal http://nodal.ercot.com 1 EDS 3R5 Phase 1 Testing Detailed Approach and Demonstration August 16, 2007

2. Lead from the front Texas Nodal http://nodal.ercot.com 2 Agenda High Level Overview Detailed Activities –Preparation Activities –Ping Test Walk Through –Support / Testing Window –Make-Up Session Q&A

3. Lead from the front Texas Nodal http://nodal.ercot.com 3 High Level Overview

4. Lead from the front Texas Nodal http://nodal.ercot.com 4 Detailed Activities: Preparation Activities 2 Weeks Prior to Support / Testing Window –QSE Receives Resource Data from ERCOT –QSE Validates / Corrects Resource Data and Returns to ERCOT (see circled columns below) –ERCOT Makes Necessary Changes in the MMS

5. Lead from the front Texas Nodal http://nodal.ercot.com 5 Detailed Activities: Preparation Activities 2 Weeks Prior to Support / Testing Window –Note: For All Individual MP / ERCOT Calls, ERCOT will Supply a Conference Bridge Prior to the Meeting Date –QSE Creates Sample XML Files for Prevalidation: Use One Unit from the List Sent by ERCOT Create COP, Create TOP, Create OS and –MP Sends Sample XML to ERCOT for Pre-Validation –ERCOT Pre-Validates Sample Files and Shares Results with QSE –QSE Created Remaining Transactions Based on Sample Files >>> Current XML Samples Fields to be Modified Demo Process for Pre-Validation

6. Lead from the front Texas Nodal http://nodal.ercot.com 6 Detailed Activities: Ping Test Walk Through ~1 Week Prior to Support / Testing Window –EDS Digital Certificate Sent to MP USA Sent via email Email will indicate the certificate should go to EDS Primary Contact ERCOT will notify MP Primary Contact with name of MP USA

7. Lead from the front Texas Nodal http://nodal.ercot.com 7 Detailed Activities: Ping Test Walk Through ~1 Week Prior to Support / Testing Window –“Ping” Test (Note: ERCOT to supply conf. bridge prior to call) NOTE: All EDS 3 Phase 1 Testing will be Over the Internet (not private WAN) Required Personnel (MP) –MP Primary Contact / Project Manager –Individual w/ Administrator Access on Workstation to be Used for UI Access –Network Administrator (issue resolution, if any) Perform Telnet Test from MP to ERCOT MMS UI and EWS Perform Telnet Test from ERCOT to MP Listener (Optional) “Ping” Walkthrough – MMS UI >> –Install xForms Plug-In on MP Browser (requires MP administrator account) –MP User Successfully Authenticates Using EDS Digital Certificate –Screen Properly Paints for MP User (verification of xForms install)

8. Lead from the front Texas Nodal http://nodal.ercot.com 8 Detailed Activities: Ping Test Walk Through ~1 Week Prior to Support / Testing Window –“Ping” Test (continued) “Ping” Walkthrough – EWS (API) –System Status Message Successfully Sent with Response –Issue Resolution (if any)

9. Lead from the front Texas Nodal http://nodal.ercot.com 9 Detailed Activities Support / Testing Window Support / Testing Window –2 Hour Support / Testing call (Note: ERCOT to supply conf. bridge prior to call) Date and Time of Call is Noted on the Schedule Sent to Each MP’s Primary Contact Required Personnel (MP): –MP Primary Contact / Project Manager –MP SME (if different than above) –Individual w/ Administrator Access on Workstation to be Used for UI Access (if workstation will be different than the one used in “Ping” test) Walk through Testing Checklist (included with each QSE’s contact) Address Issues (if any) –If possible, issues will be resolved during support call –Unresolved issues will retain a high priority and be addressed following the meeting

10. Lead from the front Texas Nodal http://nodal.ercot.com 10 Detailed Activities Support / Testing Window Support / Testing Window –7 Day Testing Window MP’s to execute their own “defined” tests Issues reported / discovered during this period will be via the issue tracking process. Note: issue reporting spreadsheet can be found at: http://nodal.ercot.com/readiness/eds3/documents/genkd/ERCOT%20EDS%20Issue%20Submission%20Fo rm.xls Send this form to eds3@ercot.com Note: Current ERCOT known issues can be reviewed at http://nodal.ercot.com/readiness/sandbox/documents/docs/Sandbox_Defects.xls http://nodal.ercot.com/readiness/eds3/documents/genkd/ERCOT%20EDS%20Issue%20Submission%20Fo rm.xlseds3@ercot.com http://nodal.ercot.com/readiness/sandbox/documents/docs/Sandbox_Defects.xls 7 Day Support / Testing Window Wrap-Up –MP Receives Completion Report from ERCOT (filled-in testing checklist and updated schedule) –MP Access to EDS Environment Removed –Make-up Session (if required) Officially Scheduled (Note: make-up sessions on the public master schedule are placeholders and subject to change)

11. Lead from the front Texas Nodal http://nodal.ercot.com 11 Detailed Activities Make-Up Session Make-Up Session –MP Access to EDS Environment Restored –Scheduled / Held as Required –1-2 hour Support Call to Re-Test Failed Test Cases –3 Days Environment Access (including day of support call) –Make-Up Session Wrap-Up MP Receives Updated Completion Report from ERCOT MP Access to EDS Environment Removed –Issues Remaining After Make-Up Session will be Re-Validated in EDS3R5 Phase 2 Testing

12. Lead from the front Texas Nodal http://nodal.ercot.com 12 Q&A