Data Gathering and Reporting Summary

1. Data Gathering and Reporting Summary Robert W. Staples, III. Associate Reliability Analyst March 23, 2005

2. Objectives • Learn how data is collected to assess performance for the following: • Regulation Service • Balancing Energy Service • Responsive Reserve Service • Non-Spinning Reserve Service • Resource Plan Performance Metrics • Other Data Gathering

3. NERC Criteria for ERCOT • Control Areas (ERCOT) are assessed by NERC for adequate frequency control on a monthly basis. • CPS1 (Control Performance Standard) • CPS2 • In order for ERCOT to meet this NERC Criteria, ERCOT assesses the performance of QSEs. • Regulation Service Monitoring Criteria, 6.10.5.3 • Balancing Energy Monitoring Criteria, 6.10.5.2 • Non-Spinning Energy Monitoring Criteria, 6.10.5.5

4. NERC CPS1 & CPS2 Criteria • 1- & 10-minute Frequency-based measure for ERCOT • ERCOT Energy Management System (EMS) collects data and averages it into 1- & 10-minute intervals • Data stored in Data Archive • A display in the EMS calculates this score by day and month • ERCOT would be in violation with NERC if their 12-month rolling average of CPS1 goes below 100%. • ERCOT currently has a waiver from NERC for CPS2.

5. Regulation Service • 1- & 10-minute SCE-based measure for QSEs • ERCOT Energy Management System (EMS) collects data and averages it into 1- & 10-minute intervals • Data stored in Data Archive • A Microsoft Access Database is used to generate scores • If 1-minute score is below 100% or 10-minute score is below 90%, then procedures outlined in Compliance Template for this criteria will be followed.

6. Regulation Service

7. Balancing Energy • Performance is assessed by Settlement Interval • Energy Schedules, Balancing Deployments, and Average ERCOT Calculated SCE for a QSE are used. • ERCOT EMS collects data and data is stored in Data Archive. • A Microsoft Access Database is used to generate scores.

8. Balancing Energy

9. Non-Spinning Reserve Service • Performance is assessed by individual deployment • ERCOT EMS collects data and data is sent to a historian called PI. Non-Spin Deployment data in PI is verified with data in the Data Archive. • What is considered ACCEPTABLE performance? • Each 15-minute interval with a deployment is assessed. • Average ERCOT Calculated SCE for each QSE is used.

10. NERC Criteria for ERCOT • ERCOT is assessed by NERC for adequate frequency response to major events on a quarterly basis. • DCS (Disturbance Control Standard) • In order for ERCOT to meet this NERC Criteria, ERCOT assesses the performance of QSEs. • Responsive Reserve Monitoring Criteria, 6.10.5.4

11. NERC DCS Standard • Measures a Control Area’s ability to utilize its Contingency Reserves following a Reportable Disturbance. (NERC Policy 1B) • Reportable Disturbances are contingencies 80% - 100% of the most severe single contingency loss. • ERCOT’s most severe single contingency is defined as losing one STP Unit rated at 1250 MW. • Frequency must return to 60 Hz, or the pre-disturbance value if below 60 Hz just prior to the disturbance, within 15 minutes.

12. Responsive Reserve Service • Performance is assessed by individual deployment • ERCOT EMS collects data and data is sent to a historian called PI. • Data used to determine Compliance is pulled from PI. • ERCOT Calculated SCE 10 minutes after RRS is fully deployed is used.

13. Exclusions • Portfolio & Resource Ramp Rate Violations • Necessary data is available to obtain from the Data Archive. This data goes into the Access Databases for Regulation & Balancing. • Verbal Dispatch Instructions and Verbal Dispatch Exceptions • Receive Excel Spreadsheet from Settlements on a monthly basis • These are pulled out manually for QSEs that fail after other adjustments have been made • Unit Trips • Pulled out of the Technical Operations Logs • These are pulled out manually for QSEs that fail after other adjustments have been made • Other periods of abnormal operations as determined by ERCOT • ERCOT System issues, QSE System issues

14. Upcoming Changes • PRR525, SCE Performance and Monitoring, was approved by TAC on March 3rd but will not be in effect until System Implementation. • Incorporates all QSEs with generation into one performance criteria • Replaces Balancing Energy Performance Criteria • Replaces Regulation Service Performance Criteria • Criteria for Responsive Reserve and Non-Spin would still apply.

15. Resource Plan Metrics • These metrics contain six (6) measures: • Resource Status • Resource LSL as a % of HSL • Day Ahead Zonal Schedule • Adjustment Period Zonal Schedule • Down Bid & Obligation • Total Up AS Scheduled Obligation • All data for these is stored and pulled out of the Data Archive.

16. Resource Plan Metrics • Resource Status • Resource Plan Data • SCADA Telemetry Data • Resource LSL as a % of HSL • Resource Plan Data • Day Ahead Zonal Schedule • Resource Plan Data • Energy Schedule Data

17. Resource Plan Metrics • Adjustment Period Zonal Schedule • Resource Plan Data • Energy Schedule Data • Down Bid & Obligation • Resource Plan Data • Energy Schedule Data • Down Balancing Bids • Down Regulation Scheduled • Total Up AS Scheduled Obligation • Resource Plan Data • Regulation Up, Responsive Reserve, & Non-Spin Scheduled

18. Resource Plan Metrics

19. Transmission Security • ERCOT Operations monitors CSC flows & limits daily. If there is an IROL (Interconnection Reliability Operating Limit) Violation, Operations will report this to NERC. • As verification, Compliance collects instances monthly where the CSC flow went above the limit. • ERCOT Operations looks at what we collect and reviews these with Compliance for possible IROL violations.

20. Transmission Security

21. Transmission Security • If you guessed two, you would be incorrect! • There were actually three but one only lasted 10 seconds. • The longest one lasted 75 minutes.

22. Other Data Gathering • Annual Data Collection • Under Frequency Load Shedding Survey • Transmission Relay Misoperations Reports • Disturbance Monitor Location and Testing Reports • Annual Load Data Request • Loss of Primary Control Center Plans • Blackstart Plans IMPORTANT: Many of these are processes run by other parts of ERCOT (Operations, Planning) and are not purely Compliance driven efforts. This means that submittals of information may not be made to ERCOT Compliance.

23. Other Data Gathering • Data collected at other intervals • Seasonal Unit Net Dependable Capability Tests • Quarterly Rolling Twelve Month Outage Plans • 2-year Reactive Capability Tests • 2-year LaaR Testing • 5-year Automatic Voltage Regulator Tests • Blackstart Unit Tests • 1 year Start Tests • 3 year Synchronizing • and 5 year Load Pickup Tests • Event driven data collection (often with investigations): • Forced outage reporting requirements • SCADA point delivery • Model submittal/model validation

24. Review • Regulation & Balancing Monitoring Criteria are assessed by ERCOT to ensure ERCOT passes the NERC _____ Criteria. • Responsive Reserve Monitoring Criteria is assessed by ERCOT to ensure ERCOT passes the NERC _____ Standard. • Name another topic discussed in some detail other than frequency control: __________________ CPS1 DCS Transmission Security

25. Questions