1. 1 1 Texas Nodal Program Update April 22, 2008 David Hackett, Nodal EMS PM Apr 22, 2008 Nodal EMS Update

2. 2 2 Texas Nodal Program Update April 22, 2008 EMS CIM Importer Pre-FAT currently in progress CIM Importer FAT currently scheduled to end May 02, 2008 (moved from April 18, 2008) SPR / bug fix cycle in progress, scheduled to end April 25, 2008 Confidence level of FAT completion by May 02, 2008 is low 10 Sev 1s / Sev 2s out of 42 defects written ERCOT is ready to retest as fixes become available CIM File Importer CIM Based Data Repository Model Workspace Netmom Tables Netmom Exporter SCADAmom Tables SCADAmom Exporter Genmom Tables Genmom Exporter DynRatings Tables DynRatings Exporter OAGmom Tables OAGmom Exporter RASmom Tables RASmom Exporter CTGS Tables CTGS Exporter Graphic Modeler User Interface Pre-FAT Complete With minor issues Sev 1 / Sev 2 issues Testing incomplete SCADADynamic Ratings ICCP Network Applications Generation CIMIMPORTERCIMIMPORTER

3. 3 3 Texas Nodal Program Update April 22, 2008 Most functionality in EMS 3C and EMS 4 deployed to EDS Resource Qualification Testing Monitor FAT in progress- expected completion April 25, 2008 (delay due to AREVA lead developer car accident) Mid Term Load Forecast FAT in progress – expected completion April 25, 2008 VSAT and TSAT FAT delayed due to hardware issues, expected resolution date – May 2, 2008; pre-FAT completed in March EMS 5 (Voltage Support & Outage Evaluation) on track for FAT start in late May 2008 (AREVA is working an resource issue) (Includes final testing of the study applications)