1. TPTF CIM Health Check Raj Chudgar Program Director for Market Redesign

2. 2 TPTF 3 As indicated in the CIM Health check progress report at last TPTF, Major challenge for Nodal is the successful integration of CIM data CIM critical dependency is on successful model integration of EMS, MMS and NMMS 2 1234

3. 3 TPTF 3 Current progress is as represented in the bubbles CIM critical dependency is on successful model integration of EMS, MMS and NMMS 2 1234 EMS CIM Importer currently in Pre-FAT MMS MMS4 will begin FAT 4/22/08 NMMS Exchanging model with EMS and MMS to finalize schema

4. 4 TPTF CIM Impacts on the Nodal Early Delivery Systems (EDS) EDS 2 Release 4NOMCR Checkout and Network Model Verification Current XXX EDS 3 Release 6.3LFC Testing ERCOT systemJune ‘08 XXX EDS 3 Release 7.5CRR Integration TestingJune ‘08 X EDS 4 Release 9.3Initial DAM/RUC Execution *(as discussed at last TPTF, ERCOT is implementing a workaround to start 9.3) April ’08 XXX EDS 4 Release 9.4DAM, RUC and Adjustment Period Execution May ’08 XXX EDS 4 Release 9.5Execute Full Nodal Integrated System July ’08 XXX EMS Zonal Exporter NMMS Exporter MMS Importer EMS Importer 1423

5. 5 TPTF CIM Exporter/Importer still under development – listed below is the current state Design/Build Exporter/Importer Design Documents Complete & Build Testing CIM Exporter or CIM Importer Test Plan Data Validation Data Model and Data Market Trials NMMS Initial Design complete. Refactoring in progress. ERCOT NMMS testing exporter since April 2007 Data Model: updated per downstream system request. Will need to sync up data model versions in the future Data: ON GOING, waiting for EMS importer NOMCR Market Trials MMS Initial Design complete. Refactoring in progress MMS CIM importer testing since November 2007. Outstanding issues communicated to NMMS team Data Model: Few critical issues remain. MMS Application able to import NMMS Nodal Model. Will need to sync up data model versions in the future Data: ON GOING Starting to use CIM for 9.3 Trials EMS Initial Design in progress.Network Model testing in progress. Data model: Network model validation in progress. Will need to sync up data model versions in the future Data: ON GOING Not Using CIM 123 CIM Component Measurement Items

6. 6 TPTF NMMS - Mitigation items to get to Green Design and Build –Network Model exchange with multiple vendors on-going. Task targeted to be completed by May 2 nd, 2008 to allow time for data load and validation prior to Single Entry Go Live Testing –ERCOT NMMS will be completed with FAT for NMMS 3 on April 30 th, 2008 Data Model Validation –Base-case comparison between Zonal and Nodal Network Models –Dependent on downstream applications. Currently working with EMS and MMS to provide full set of classes and attributes that are needed for their files Data Validation –TSPs validation of data in Network Model underway, will be an on-going item post Go Live Market Trials –NOMCR Market Trials underway. Will be completed May 20 th 1

7. 7 TPTF MMS - Mitigation items to get to Green Design and Build –Initial design is complete. –Regular conversations on the status of CIM importer occurring between ERCOT & ABB. Testing –ERCOT involved in definition and execution of the CIM importer tests. –CIM Importer is part of MMS4 testing MMS4 Pre-FAT - CIM importer testing completed 15Apr08 MMS4 FAT - CIM importer testing will begin 22Apr08 Data Model Validation –NMMS, EMS, MMS coordinating to finalize CIM Schema. –ERCOT is working with ABB, who is maintaining a detailed, prioritized spreadsheet with all modeling and data issues. –ERCOT is performing due diligence of all CIM attributes necessary to execute all functions in MMS. –NMMS & MMS will review and confirm all data modeling requirements no later than 25Apr08 Data Validation –On-going ERCOT activity that includes MMS, EMS, NMMS, System Operations, RARF Folks, etc. Market Trials –EDS 4 Release 9.3 will be using CIM. 2

8. 8 TPTF EMS - Mitigation items to get to Green Design and Build –ERCOT escalation to AREVA Management minimize schedule delay –ERCOT personnel on-site at AREVA –ERCOT proactively addressing open issues –Completing build will move to Green Testing –ERCOT doing preliminary testing in parallel to reduce testing cycle –ERCOT developed a comparison database to support validation Data Model Validation –NMMS, EMS, MMS coordinating to finalize CIM Schema –EMS currently in Pre-FAT for CIM Importer; expected to be in FAT on 28Apr08 Data Validation –Plans to compare the data between the Zonal Habitat Databases (source) and the Nodal Habitat Databases (generated via CIM XML) –Data validation continues as code matures with increased functionality 3

9. 9 TPTF CIM Integration Plan Given the criticality of CIM, ERCOT has assigned Linda Clarke to facilitate/coordinate CIM integration between key vendors (MMS, EMS and NMMS) CIM integration meetings are held on a weekly basis to monitor progress/expedite problem resolution The team is developing an integrated plan that drives NMMS, MMS, EMS, and EDS applications to use same version of CIM and data –Plan includes tasks necessary to successfully perform NOMCR Checkout and Network Model Verification LFC Testing ERCOT system Other EDS activities –Also includes activities to support multi-vendor interoperability test at ERCOT ERCOT will continue to provide periodic updates to TPTF on progress to date