TPTF CIM Health Check Raj Chudgar Program Director for Market Redesign

2 TPTF 3 Major challenge for Nodal is the successful integration of CIM data between NMMS, EMS, MMS and other Nodal systems CIM critical dependency is on successful model integration of EMS, MMS and NMMS

3 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

4 TPTF CIM Exporter/Importer still under development – making progress, final health check at next TPTF meeting, 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 TrialsMitigation 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 Model exchange with multiple vendors on- going Planning Interoperability Test with all vendors at ERCOT MMS Initial Design complete. Refactoring in progress MMS CIM importer testing since November 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 ABB maintaining detailed prioritized spreadsheet with all modeling and data issues. ERCOT helping define and execute CIM importer tests during MMS3 pre-FAT&FAT and MMS4 pre-FAT&FAT ERCOT performing internal due diligence of all CIM attributes necessary to execute all functions Regular conversations on the status of the CIM importer between ERCOT & ABB (technical leads, project engineers and project managers) 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 ERCOT escalation to AREVA mgmt on delay of product ERCOT personnel planned to be at AREVA to push delivery ERCOT doing preliminary testing in parallel to reduce testing cycle ERCOT setting up hardware in advance of product delivery 123 CIM Component Measurement Items