1. Retail Market IT Services SLA and Service Availability Metrics TAC August 2 nd, 2007

2. Retail Market IT Services SLA Agreement Highlights: –Retail Transaction Processing 99.9% availability target No availability metric reporting threshold for market facing components (NAESB) 15 minute availability reporting threshold for back-end components 24x7 availability outside of maintenance/release windows Maintenance and release windows do not change –MarkeTrak 98% availability target No availability metric reporting threshold Operating hours are 7:00am – 7:00pm retail business days –MarkeTrak will be available outside of this time frame also but these hours are measured in the availability metric Maintenance and release windows are identical to transaction processing windows

3. Retail Market IT Services SLA Agreement Highlights: –TML (Texas Market Link) 99% availability target No availability metric reporting threshold 24x7 availability outside of maintenance/release windows Maintenance and release windows are identical to transaction processing windows Reporting : –Availability slides provided monthly to RMS –Detailed incident data update provided monthly on reporting summary spreadsheet posted on RMS website

4. Retail Market IT Services SLA = 0 min reporting threshold = 15 min reporting threshold

5. 2007 Net Service Availability

6. June 2007 Net Service Availability

7. Retail Transaction Processing Availability Summary