1. Lead from the front Texas Nodal http://nodal.ercot.com 1 TDWG Nodal Update – June 6, 2007 http://nodal.ercot.com 1 Texas Nodal Market Implementation Server Consolidation Update ERCOT IT

2. Lead from the front Texas Nodal http://nodal.ercot.com 2 TDWG Nodal Update – June 6, 2007 Nodal is migrating 74 servers to 4 AIX servers We will do this with the minimum disruption We have a plan to: –Minimize the risk –Maximize the benefit –Lower overall costs –Safeguard Market Operations –Improve service levels –Not affect Texas Set 3.0 However, there are always risks to be aware of in server migration We are working with all the project managers and ERCOT committees to reduce risk and to optimize the timing.

3. Lead from the front Texas Nodal http://nodal.ercot.com 3 TDWG Nodal Update – June 6, 2007 Current data center capacity is near maximum

4. Lead from the front Texas Nodal Migrated 28 databases Decommissioned 6 servers Installed temporary storage Completed Application and script review Recovered ~20% of previously used storage Consolidation efforts progressing according to plan Migration Metrics 41%2628 % Remaining Retired/ RefreshMigrated 91 Starting Total Databases 1,753.1 Reduction 0 Require Modification 4 Retired 0% % Remaining to Review 86% % Remaining 6,486.2 Post Migration Bytes Used 229 Reviewed 6 Decommis- sioned 8,239.3 Pre-Migration Bytes Used Database Storage (in GB) 229 Total Files Applications/Scripts 74 Starting Total Servers http://nodal.ercot.com 4 TDWG Nodal Update – June 6, 2007

5. Lead from the front Texas Nodal Consolidation efforts move in waves of like business systems Market facing migrations begin after Texas Set and continue through October. http://nodal.ercot.com 5 TDWG Nodal Update – June 6, 2007

6. Lead from the front Texas Nodal http://nodal.ercot.com 6 TDWG – Nodal Update – June 6, 2007 Reliability improvements are part of the consolidation effort Oracle Real Application Clustering (RAC) deployment RAC provides for a complete failover to another physical server in the event of a total failure of the primary server. For redundancy requires duplicate computing resources on two separate physical servers. Provides the ability to scale up to the maximum capacity of all systems in the RAC cluster to meet usage demands. Oracle Single Node Deployment on Nodal Hardware System can recover from multiple component failures (CPU/Memory/Power Supply/ IO) with spare capacity within the system. Provides the ability to balance the load across all applications running on the system. Provides the ability to scale up to the maximum capacity of the system to meet usage demands As proposed in SCR 745 Phase 3 To be implemented with Server Consolidation Project

7. Lead from the front Texas Nodal http://nodal.ercot.com 7 TDWG Nodal Update – June 6, 2007 Questions http://nodal.ercot.com 7