1. June 26, 2007 2-1 PCWA - Middle Fork Project Project Operations 6-26-2007

2. June26, 20072-2 Presentation Agenda Review PCWA Interests and Operating Objectives Review PCWA Interests and Operating Objectives Overview Operations Overview Operations Describe Key Characteristics of MFP Operations Describe Key Characteristics of MFP Operations

3. June26, 20072-3 Interests Water Supply Water Supply Energy Generation Energy Generation Protection of environmental, recreational and cultural resources Protection of environmental, recreational and cultural resources

4. June26, 20072-4 Operating Objectives Comply with FERC license conditions Comply with FERC license conditions Serve water demands in Placer County Serve water demands in Placer County Generate power during peak energy demand period Generate power during peak energy demand period Maintain project facilities Maintain project facilities

5. June26, 20072-5 MFP Operations

6. June26, 20072-6 Contact PCWA for Non-Internet Public Figure 5-1 Principle Project Facilities

7. June26, 20072-7 Hydrology / Diversion Rights Permits Water available for use Water Uses Stream Maintenance Flow Consumptive Use Generation MFP Facilities – Physical Capacities Reservoir Storage Diversion, tunnel and powerhouse flows Annual Operations Cycle Reservoir Fill Period Reservoir Release Period - stream maintenance - delivery for water use - peaking generation - recreation flows Maintenance Period Annual Operations Cycle

8. June26, 20072-8 Annual MFP Inflow

9. June26, 20072-9 Reservoir Refill

10. June26, 20072-10 Combined Reservoir Storage

11. June26, 20072-11 Water Supply Delivery Obligations to: Delivery Obligations to: PCWA - Zone 1 PCWA - Zone 1 San Juan Water District San Juan Water District City of Roseville City of Roseville Sacramento Suburban Water District Sacramento Suburban Water District Diversion points for delivery at American River Pump Station (Auburn) and Folsom Reservoir Diversion points for delivery at American River Pump Station (Auburn) and Folsom Reservoir Limited to 120,000 acre-feet year Limited to 120,000 acre-feet year

12. June26, 20072-12 Seasonal Consumptive Demand Pattern 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 JanFebMarAprMayJunJulAugSepOctNovDec Month. Deliveries, AF

13. June26, 20072-13 Releases for Generation May occur all year May occur all year Seasonal demand pattern Seasonal demand pattern Water released to meet water supply needs passes through the powerhouses contributing to generation Water released to meet water supply needs passes through the powerhouses contributing to generation

14. June26, 20072-14 Total Annual Generation Flows (Middle Fork Powerhouse)

15. June26, 20072-15 Seasonal Energy Demand Pattern 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 1/1/062/1/06 3/1/06 4/1/065/1/066/1/067/1/068/1/069/1/06 10/1/06 11/1/06 12/1/06 Load in MW

16. June26, 20072-16 Monthly Releases for Generation - Dry Period (1987 – 1992)

17. June26, 20072-17 Monthly Releases for Generation - Wet Period (1995 – 1998)

18. June26, 20072-18 Peaking Generation versus Daily Energy Demand

19. June26, 20072-19 Peaking Generation Wet vs. Dry Year

20. June26, 20072-20 Recreation Flows Below Oxbow Powerhouse, Project releases are frequently compatible with commercial rafting needs Below Oxbow Powerhouse, Project releases are frequently compatible with commercial rafting needs Occasionally Project releases may be modified to facilitate commercial rafting and other recreation uses Occasionally Project releases may be modified to facilitate commercial rafting and other recreation uses

21. June26, 20072-21 Annual Testing and Maintenance Fall (by Nov. 1) - 5 weeks for Middle Fork, Ralston and Oxbow Powerhouses Fall (by Nov. 1) - 5 weeks for Middle Fork, Ralston and Oxbow Powerhouses Period of lower energy and consumptive water demand Period of lower energy and consumptive water demand Favorable weather conditions Favorable weather conditions Low runoff Low runoff Spring - 2 weeks for French Meadows and Hell Hole Powerhouses Spring - 2 weeks for French Meadows and Hell Hole Powerhouses

22. June26, 20072-22 Key Operating Characteristics

23. June26, 20072-23 “Storage Flexibility” Flexibility to manage storage and release Flexibility to manage storage and release Capture spring runoff Capture spring runoff Release during Summer and Fall Release during Summer and Fall Limited by minimum storage level requirements Limited by minimum storage level requirements Balance between releases vs. retaining water for dry years Balance between releases vs. retaining water for dry years

24. June26, 20072-24 Drawdown during summer to meet water supply, energy demand and to provide storage space for the following year. Drawdown during summer to meet water supply, energy demand and to provide storage space for the following year. Release water from storage all year to meet consumption demand patterns Release water from storage all year to meet consumption demand patterns Drawdown in fall to provide storage for spring runoff Drawdown in fall to provide storage for spring runoff Higher drawdown during drought to meet needs Higher drawdown during drought to meet needs

25. June26, 20072-25 “Combined Operation of Middle Fork and Ralston Powerhouses” Operated to generate on peak Operated to generate on peak Operated at the same time to avoid spill Operated at the same time to avoid spill Vary output hourly/daily to meet energy needs Vary output hourly/daily to meet energy needs

26. June26, 20072-26 “Operation of Oxbow Powerhouse and Ralston Afterbay” Operation of Oxbow Powerhouse on the same schedule minimizes reservoir changes at Ralston Afterbay Operation of Oxbow Powerhouse on the same schedule minimizes reservoir changes at Ralston Afterbay Ralston Afterbay can re-regulate flows below Oxbow Ralston Afterbay can re-regulate flows below Oxbow

27. June 26, 2007 2-27 “Schedule seasonal releases to follow combined pattern of water and energy demand”

28. June 26, 2007 2-28 “Maintenance in the Fall”

29. June26, 20072-29 Presentation Agenda Review PCWA Interests and Operating Objectives Review PCWA Interests and Operating Objectives Overview Operations Overview Operations Describe Key Characteristics of MFP Operations Describe Key Characteristics of MFP Operations