1. Information Technology Service Availability Metrics RMS August 2008 Trey Felton

2. 2 Agenda and Commentary Retail and Wholesale Systems Performance Retail Transaction Processing - year to date performance continues to be below the service level target. Wholesale Batch Operations – July performance was impacted by a data issue that caused a job to abort and be backed out and rerun. The delay caused by this incident required several days of catch up time to meet the success criteria. Market and Grid Control Systems Performance Real Time Balancing Market – no problems in July Frequency Control – no problems in July 19 August 2008ERCOT Public

3. 3 Metrics Guide - Retail, Wholesale & System Operations Retail & Wholesale Operations –Retail Transaction Processing Measure of the availability of the systems that process retail transactions –Texas Market Link (TML) Measure of the availability of the web-based application that provides access to both general and market participant specific data –MarkeTrak Measure of the availability of the web-based application that is used to track retail market transaction issues and resolve data discrepancies –Wholesale Total Measure of the success rate of ERCOT’s settlement & billing batch process completing on schedule –TML Report Explorer Measure of the availability of the web-based application that is used by Market Participants to download Data extracts and reports and set data delivery schedules –Retail API Measure of the availability of the Application Programming Interface that is used by Market Participants to download Data extracts and reports and set data delivery schedules System Operations –Real Time Balancing Market Measure of the number of real time balancing market intervals (every 15 minutes) successfully performed –Frequency Control Measure of the availability of the software that controls frequency 19 August 2008ERCOT Public

4. 4 2008 Net Service Availability 19 August 2008ERCOT Public

5. 5 July 2008 Net Service Availability 19 August 2008ERCOT Public

6. 6 Retail Transaction Processing Availability Summary 19 August 2008ERCOT Public

7. 7 TML Availability Summary 19 August 2008ERCOT Public

8. 8 MarkeTrak Availability Summary 19 August 2008ERCOT Public

9. 9 TML Report Explorer Availability Summary 19 August 2008ERCOT Public

10. 10 Retail API Availability Summary 19 August 2008ERCOT Public

11. 11 Request to add SLA Exceptions to Metrics

12. 12 Sample 1: Availability Summary 7

13. 13 Sample 2: Impact if SLA exceptions had not been granted