1. 1 Processing Large Volumes 814_20s Issues / Discussion / Ideas

2. 2 Background of Issue At May TX SET and June RMS – TXU ED brought forward questions related to processing large volumes of 814_20s. Request of TXU ED at June RMS – –Establish a task force to: Establish future volumes and processing requirements Evaluate current TIBCO project to determine capabilities Determine options for increasing ERCOT processing Explore other transactions or other Market Notification processes At June RMS – ERCOT said we would discuss internally and bring back ideas to help RMS leadership determine next steps.

3. 3 Large Volumes / Business Reasons Potential business reasons for large volumes of 814_20s –All TDSPs - Annual Validation –All TDSPs - T & C’s requirements for duplicate address clarifications –All TDSPs - Retirement of temporary accounts (volumes may vary by TDSPs) –TXU ED - Rate Expansion – approx. 3,000,000 accounts (weekend conversion) –TXU ED - On going conversion of AMR project over next 5 years –TXU ED - Future rate and franchise changes processes

4. 4 Current Processes Load Profiling Guide outlines the process for annual validations. The TDSP and ERCOT work together on schedule to process large volumes –For 2006 – approx 867,000 will be sent Approx 200,000 per weekend – across 4 weekends (Fri/Sat/Sun/Mon) –Future volumes expected to drop to approximately 300,000 per year –ERCOT process capabilities for 814_20 maintenance transactions are currently between 25K to 50K transactions daily.

5. 5 Ideas to Consider Draft protocol language to address large volumes for business reasons other than annual validation – may want to consider the plan of coordination between TDSPs and ERCOT After protocol changes are approved, then ask TX SET to look at –New file format for large volumes of 814_20 maintains to be sent in 'mass update file' to load at ERCOT –New file format for large volumes of 814_20 maintains to be sent to CRs to communicate ‘mass update file’ –Additional type of 814_20 maintain – separate out information that needs to be sent to ERCOT or CR only Ask ERCOT for additional analysis after implementation of TIBCO, (in Jan 2007) with volumes and timings After Nodal system design, explore processing window changes (uncouple from batch)