1. Western Electricity Coordinating Council Frequency Responsive Reserve Workshop Kenneth J. Wilson Staff Engineer Frequency Responsive Reserve Standard Drafting Team February 12, 2009

2. Western Electricity Coordinating Council Limiting Condition 2

3. Western Electricity Coordinating Council Load Response 3

4. Western Electricity Coordinating Council Typical Frequency Excursion 4

5. Western Electricity Coordinating Council 5 Sensitivities to FRR Amount Case A (baseline) – June 14 2004 event validation case Case B – current UFLS settings are maintained base-loaded generating capacity is increased until frequency for 2 PV outage drops to 59.5 Hz Case C – current UFLS settings are maintained base-loaded generating capacity is increased until frequency for 2 DCNG outage drops to 59.65 Hz Comment: Diablo Canyon NG outage is the next worst G-2 after 2 PV Case D – UFLS is blocked base-loaded generating capacity is increased until frequency for 2 PV outage drops to approximately 59.5 Hz

6. Western Electricity Coordinating Council 6

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8. 8 Frequency Responsive Reserve Questions Kenneth J. Wilson Staff Engineer Western Electricity Coordinating Council 615 Arapeen Drive, Suite 210 Salt Lake City, Utah 84108-1262 801.582.0353