1. EDS 1 Early Delivery Systems Testing Preparation WebEx Meeting Jonathan Pulcini - EDS 1 John Webb - EDS 1 Ken Kasparian - EDS 3 Bill Blevins - EMS Frank Kendall - EMS May 16, 2007

2. Page 2 2 EDS 1 – Release 2 May 2007 EDS 1 – Early Delivery Systems Agenda 9:30 -10:00 am EDS 1 Point Verification Process – Jonathan Pulcini –Pre-Verification Activities –Verification Activities –Post-Verification Activities –Q&A 10:00 – 10:30am QSE Nodal Point Verification – John Webb and Ken Kasparian –Inbound Testing Schedule (EDS 1 / EDS 3) –Outbound Testing Schedule (EDS 1 / EDS 3) –Q&A 10:30 – 12:00 noon ICCP Handbook – Bill Blevins and Frank Kendall –Overview of sections –Specific review of recent updates –Q & A

3. Page 3 3 EDS 1 – Release 2 May 2007 EDS 1 – Early Delivery Systems EDS 1 Point Verification Process Jonathan Pulcini

4. Page 4 4 EDS 1 – Release 2 May 2007 EDS 1 – Early Delivery Systems Point to Point Verification Testing - Scheduling –Testing Timeline is June 1 st – Sept 30 th –EDS1 is scheduling with MPs currently for all time slots –Contact Jonathan Pulcini at eds1@ercot.com to schedule testingeds1@ercot.com

5. Page 5 5 EDS 1 – Release 2 May 2007 EDS 1 Testing Timeline June Initial TSP and QSE Testing: confirmed ONCOR ELECTRIC DELIVERY COMPANY, CENTERPOINT ENERGY HOUSTON ELECTRIC LLC AND NRG TEXAS LP July QSE and TSP Testing: 1 st two weeks are confirmed ONCOR ELECTRIC DELIVERY COMPANY, EXELON, APX (need list of sub QSEs), RELIANT Availability remains for weeks of 7/16-720, 7/23-727 August QSE and TSP Testing: AUSTIN ENERGY (TSP), CPS (TSP) Availability remains for most of month September QSE and TSP Testing: BRAZOS ELECTRIC COMPANY (QSE/TSP) Availability remains for most of month

6. Page 6 6 EDS 1 – Release 2 May 2007 Testing Preparation – Confirming Schedule By May 30 th –Confirm testing schedule with ERCOT for each MP. –MP must confirm number of testing resources available during scheduled time slot. –For any other questions or issues that need to be addressed, ERCOT will schedule a call with the MP as needed. –POC for EDS 1 Testing - Contact Jonathan Pulcini at eds1@ercot.com to schedule testing. eds1@ercot.com

7. Page 7 7 EDS 1 – Release 2 May 2007 Testing Preparation – Pre-Testing Activities Four Weeks Prior to Testing –ERCOT sends the Market Participant (MP) the AIEF form to complete. –The MP emails the ICCP team a completed AIEF form to Steve White at swhite@ercot.com.swhite@ercot.com –ERCOT sends the MP an ICCP Change Request Form pre- populated with existing Zonal ICCP points. –ERCOT completes all network requests and verifies network connectivity with the MP. Note: these steps have already been completed for CenterPoint Energy

8. Page 8 8 EDS 1 – Release 2 May 2007 Testing Preparation – Pre-Testing Activities Three Weeks Prior to Testing –MP submits the ICCP Service Request: link http://nodal.ercot.com/readiness/eds1/documents/index.htmlhttp://nodal.ercot.com/readiness/eds1/documents/index.html as a Service Request (SR) through the Texas Market Link (TML) with all new ICCP points using the pre-populated service request form sent by ERCOT the previous week. Note: ERCOT requests that MPs submit SRs to TML early in the week to give ERCOT time to review the list and load changes into their Wednesday database batch load –MP sends: detailed schedule (list of stations/resources to test each day) number of resources available testing contacts (name, phone, email) –ERCOT loads existing SCADA points into EMS database as part of the weekly Wednesday batch load.

9. Page 9 9 EDS 1 – Release 2 May 2007 Testing Preparation – Pre-Testing Activities Two Weeks Prior to Testing –ERCOT loads new ICCP data points for the MP into ICCP test database. –EDS 1 testing team loads ICCP testing data points into EDS 1 testing database. –ERCOT generates and sends test checklists to the MP for verification. –MP sends ERCOT one line diagrams (if available) for all stations/resources that will be tested.

10. Page 10 10 EDS 1 – Release 2 May 2007 Testing Preparation – Pre-Testing Activities One Week Prior to Testing –ERCOT re-confirms testing schedule with the MP. –ERCOT updates testing checklists and resends to the MP. –ERCOT conducts a pre-test with one MP station/resource scheduled for testing the first week. Note: Testing will consist of verifying status changes on a unit, reviewing randomly selected analog points, and manually changes some points. The MP must have at least one resource available to conduct pre-testing.

11. Page 11 11 EDS 1 – Release 2 May 2007 Testing Preparation – Testing Activities P2P Testing –ERCOT records the MP operator name, contact information, and start time of the test on each test checklist. –ERCOT cross-verifies with the MP all analog point values and quality codes on both ends. –The MP changes values of selected analog points on their side and ERCOT verifies changes in value, quality code, and update time at ERCOT. –The MP toggles status of each status point. ERCOT verifies status change, change in quality code and time taken for update on tabular displays.

12. Page 12 12 EDS 1 – Release 2 May 2007 Testing Preparation – Testing Activities Immediately Following Test –ERCOT logs, categorizes, and prioritizes all the identified problems. –ERCOT sends an electronically signed copy of the test results to the MP through email. –MP emails confirmation and agreement of the ERCOT electronically signed copy to eds1@ercot.comeds1@ercot.com –ERCOT provides a weekly status on testing results to track progress at: http://nodal.ercot.com - Readiness Center tab, Key Documentshttp://nodal.ercot.com EDS 1 Weekly Status Report mmddyyyy.doc

13. Page 13 13 EDS 1 – Release 2 May 2007 Testing Preparation – Testing Activities EDS 1 Weekly Status Report - example

14. Page 14 14 EDS 1 – Release 2 May 2007 Testing Preparation – Post-Testing Activities Week After Testing –ERCOT updates central EDS 1 testing database with test results. –ERCOT updates issue list database based on the issues identified and assigns them either to ICCP analysts or network modeling teams. –ERCOT ICCP/Modeling teams work with the MPs to resolve problems. –EDS 1 team re-verifies the issues at appropriate time and updates the databases.

15. Page 15 15 EDS 1 – Release 2 May 2007 Questions? Point to Point Scheduling Point to Point Testing Activities

16. Page 16 16 EDS 1 – Release 2 May 2007 For more information... Visit Texas Nodal Website: http://nodal.ercot.comhttp://nodal.ercot.com Subscribe to biweekly newsletter: http://lists.ercot.com/cgi- bin/majordomo. Select TexasNodalNewshttp://lists.ercot.com/cgi- bin/majordomo E-mail questions, comments or feedback to the Nodal Transition Readiness Center at TexasNodal@ercot.com or call (512) 248-3900 to speak with a representativeTexasNodal@ercot.com Contact your account manager

17. Page 17 17 EDS 1 – Release 2 May 2007 EDS 1 – Early Delivery Systems QSE Nodal Point Verification John Webb and Ken Kasparian

18. Page 18 18 EDS 1 – Release 2 May 2007 Nodal QSE SCED / LFC Point Verification Plan Background –Each QSE will add approximately 30 new SCED / LFC ICCP points per Resource (Unit and Load) –New points are defined in the ICCP Handbook in tables 20 and 26-31 EDS 1 –Scope Load new and existing points into the Nodal ICCP database Verify ICCP connectivity, point mapping, scan rates and quality code values between QSEs and ERCOT –Inbound to ERCOT QSE Operator manually enters / toggles values for ERCOT Operator to verify –Outbound to QSEs ERCOT Operator manually enters / toggles values for QSE Operator to verify

19. Page 19 19 EDS 1 – Release 2 May 2007 Nodal QSE SCED / LFC Point Verification Plan EDS 3 –Scope Trial Operation of Security Constrained Economic Dispatch (SCED) Attain Reasonable LMPs & Begin Six Month LMP Posting Trial Operation of Load Frequency Control (LFC) –Inbound to ERCOT Real-Time ICCP point data required for SCED / LFC –Outbound to QSEs EDS 3 SCED / LFC ICCP point data

20. Page 20 20 EDS 1 – Release 2 May 2007 Step 1 (Jun – Sep 07) Step 2 (Aug – Oct 07) Step 3 (Oct – Dec 07) ICCP Validation Point to Point Checkout Configure New ICCP Data Registration Data Collection Validate Existing Data Collect New Registration Data Web Services WS Interface Specifications Development Sandbox SCED ICCP Input Connect new ICCP data sources (EMS, Field Telemetry, …) Validate new MP ICCP telemetry is available for SCED testing Registration Data Upload New Registration Data for Nodal testing Complete Registration Data Integration Web Services WS Backend Integration MMS Validation Rule Testing (Early EDS) SCED Execution Nodal Registration Data Static ICCP data inputs to validate initial stability Migrate to Real-Time ICCP data inputs for SCED testing Reasonable LMP Attainment SCED ICCP Output Complete Integration with EMS system Distribute SCED outputs via ICCP Web Service Output Distribute SCED output via Web Services Step 4 (Jan – Jun 08) LMP Posting Post LMPs for 6 months as required by the Nodal Transition Plan Utilize Real-Time ICCP data Distribute SCED outputs via Web Services & ICCP EDS 3 - Data Preparation for SCED 6 Month LMP Posting

21. Page 21 21 EDS 1 – Release 2 May 2007 Questions? QSE Nodal Point Verification

22. Page 22 22 EDS 1 – Release 2 May 2007 EDS 1 – Early Delivery Systems ICCP Handbook Bill Blevins and Frank Kendall

23. Page 23 23 EDS 1 – Release 2 May 2007 ICCP Handbook Changes Summary This ERCOT Nodal ICCP Communication Handbook Version 0.20 is a major revision from the previous Version 0.11. Changes have occurred in every section and nearly every paragraph. The document has also been organized so that material is easier to find, easier to use as a reference document, and to improve comprehension.

24. Page 24 24 EDS 1 – Release 2 May 2007 ICCP Handbook Change Summary Details All comments from ERCOT internal review, TPTF, and other Market Participants have been processed. The AIEF has been modified and moved to Appendix A. There is now only one version of the AIEF regardless of Market Participant type. An explanation of the ICCP Object Naming conventions and the purpose of the naming convention tables versus the data exchange tables has been added (Section 1.4). The ICCP Object Naming convention tables have been moved so that they are adjacent to the data exchange tables they support. The ICCP Object Naming conventions have been changed to make constructing an object name easier. The glossary has been expanded (Section 1.6).

25. Page 25 25 EDS 1 – Release 2 May 2007 ICCP Handbook Change Summary Details Section 2 has been improved and combined with the section on implementation procedures previously duplicated in the QSE and TSP sections. The description of the high data availability architecture has been given its own chapter level section (Section 3) and greatly expanded to discuss various Market Participant configurations, connections, and operation in the new architecture. Domain naming conventions have been changed to support the high data availability architecture, and the section has been reorganized for improved clarity (Section 4.3). Resource status codes have been defined and included in the Handbook (Section 4.5.2). Other improvements in clarity have been made throughout the document.

26. Page 26 26 EDS 1 – Release 2 May 2007 ICCP Handbook Next steps Address TBD issues. Post version 0.21 for TPTF approval. May 22 nd review comments and resolution with TPTF. Obtain vote from TPTF for approval. Place ICCP handbook under document control. Deliver to IRT for EDS P-P checkouts. Distribute to Market Participants.

27. Page 27 27 EDS 1 – Release 2 May 2007 Questions? ICCP Handbook