1. March 2003 Operations Summary Bill Blevins Manager Operations Engineering

2. 2 Meeting Title (optional) March 2008 –Wind Capacity ~ 5,000 MW –Load22,700,794 MWH –#Outage Gen419 –#Outage Trans2216 March 2009 –Wind Capacity ~ 8,000 MW –Load22,150,823 MWH –# Gen Outage 466 –# Trans Outage 2575 March 08 to March 09 Comparison

3. 3 Meeting Title (optional) Comparison 2008-2009

4. 4 Meeting Title (optional) Top March Congestion items

5. ERCOT Stability IROLs

6. 6 Meeting Title (optional) NERC Criteria FAC-11 –R3.3. A process for determining which of the stability limits associated with the list of multiple contingencies (provided by the Planning Authority in accordance with FAC-014 Requirement 6) are applicable for use in the operating horizon given the actual or expected system conditions. FAC-14 –R6. The Planning Authority shall identify the subset of multiple contingencies (if any), from Reliability Standard TPL-003 which result in stability limits. R6.1. The Planning Authority shall provide this list of multiple contingencies and the associated stability limits to the Reliability Coordinators that monitor the facilities associated with these contingencies and limits. R6.2. If the Planning Authority does not identify any stability-related multiple contingencies, the Planning Authority shall so notify the Reliability Coordinator.

7. 7 Meeting Title (optional) TPL-003 Multiple Contingency Criteria

8. 8 Meeting Title (optional) TPL-003 Multiple Contingency Criteria continued

9. 9 Meeting Title (optional) Standard TOP-007-0 — Reporting SOL and IROL Violations R2. Following a Contingency or other event that results in an IROL violation, the Transmission Operator shall return its transmission system to within IROL as soon as possible, but not longer than 30 minutes. R3. A Transmission Operator shall take all appropriate actions up to and including shedding firm load, or directing the shedding of firm load, in order to comply with Requirement R2. R4. The Reliability Coordinator shall evaluate actions taken to address an IROL or SOL violation and, if the actions taken are not appropriate or sufficient, direct actions required to return the system to within limits.

10. 10 Meeting Title (optional) Market tool for Zonal Balancing Deployments Current Time 2145 MARKET Flow Time 22:00

11. 11 Meeting Title (optional) Voltage Stability Limit in ERCOT identified as an IROL The interface for the North to Houston includes the four 345 KV lines Jewett to TH Wharton Jewett to Tomball Gibbons Creek to O’Brien Roans Prairie to Kuykendahl

12. 12 Meeting Title (optional) West to North Dynamic Stability Six 345kv transmission lines are measured and defined as the West North Dynamic Stability limit interface. These six 345kv transmission lines are: –Mesquite to Graham (measured as entering Graham) –Sweetwater to Graham (measured as entering Graham) –Morgan Creek to Graham (measured as entering Graham) –Bowman to Graham (measured as leaving Bowman) –Bowman to Jacksboro SS (measured as leaving Bowman) –Red Creek to Comanche (measured as entering Comanche SS)

13. ERCOT Information Available to Particpants North to Houston Voltage West to North Dynamic Stability

14. 14 Meeting Title (optional) Day Ahead

15. 15 Meeting Title (optional) Voltage Stability

16. 16 Meeting Title (optional) Messages Operations Post Real-Time

17. 17 Meeting Title (optional) CSC Calculator Results

18. 18 Meeting Title (optional) Real-Time Flows

19. 19 Meeting Title (optional) VSAT Results

20. 20 Meeting Title (optional) Info Operations Post After the fact

21. 21 Meeting Title (optional) March 29 information