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Middle Fork Project Project Operations Overview

PCWA MAY 16, 2006 HANDOUT #4. Middle Fork Project Project Operations Overview. May 2006. MF Project Facilities. Outline. Major storage is at high elevation in the Project watershed Project reservoirs store winter precipitation and spring runoff for use through the dry summer and fall

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Middle Fork Project Project Operations Overview

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  1. PCWA MAY 16, 2006 HANDOUT #4 Middle Fork Project Project Operations Overview May 2006

  2. MF Project Facilities

  3. Outline • Major storage is at high elevation in the Project watershed • Project reservoirs store winter precipitation and spring runoff for use through the dry summer and fall • Water released through Project tunnels and powerhouses flows downhill to generate power • Withdrawals from the river to meet PCWA customer demand are at the bottom (downstream end) of the Project

  4. Upper Diversion & Storage Facilities • Duncan diversion into FM Reservoir • French Meadows Reservoir • Hell Hole Reservoir • Collect and store water, total about 340 TAF • Pattern of collection & filling: • Collect in winter & spring • Release in summer and fall Duncan Diversion inlet in winter

  5. MF Project Storage Facilities

  6. French Meadows Reservoir

  7. Hell Hole Reservoir

  8. Reservoir Operations Considerations • Hydrologic variability: • Spill Avoidance • Current-year minimum releases & consumptive demands • Carry-over to meet following year demands Avg. inflow to Folsom Variability = <30% to >240%

  9. Typical Reservoir Storage Curves Targets: - Fill with minimal spill - Carry-over 150TAF total

  10. Water Flow and Generation PathwayMiddle Fork Project French Meadows Reservoir Duncan Diversion French Meadows pwrhse 400 cfs - 15 MW Middle Fork Hell Hole Reservoir Duncan Creek Interbay Reservoir MF powerhouse 850 cfs - 122 MW Ralston powerhouse 920 cfs - 80 MW Rubicon River Afterbay Reservoir Oxbow powerhouse 1050 cfs - 6 MW Middle Fork

  11. Main Power Generation Facilities • Hell Hole reservoir to Interbay via Middle Fork powerhouse

  12. Main Power Generation Facilities • Interbay to Afterbay via Ralston powerhouse • Release from Afterbay via Oxbow Powerhouse

  13. Main generation facilities encompass most of the vertical elevation of the Project

  14. Secondary Generation facilities • French Meadows powerhouse: flows from FM to HH reservoirs • Hell Hole power house – stream maintenance flows • Oxbow power house – releases to Middle Fork

  15. Main generation facilities encompass most of the vertical elevation of the Project

  16. Operations - Generation • Drivers to generation scheduling: • Water availability – reservoir level and downstream demands • Power grid needs – responsiveness to load and price

  17. Project Operations – Framework for Operations Non-Variable Constraints Water Rights Permits FERC License Terms Physical Constraints Window of Operations Non-Variable Constraints Non-Variable Constraints Hydrology Power Market Variable Factors

  18. Typical Generation Dispatch to meet Load Most Responsive Units Least Responsive Units

  19. “Peaking” Generation

  20. Project Operations for PeakingPrimarily MF & Ralston stations Middle Fork Project Profile

  21. Key Elements for Peaking Operations • Available water in Hell Hole reservoir • Middle Fork and Ralston units operate “as one” • Long tunnels and small Interbay mandate closely coordinated operations • Afterbay fluctuates for re-regulation • MF & Ralston may only generate 8 ~12 hrs/day • Downstream requirements and minimum flows are 24 hrs/day • Afterbay fills during peaking generation operations, empties when generation off-line

  22. Historic Total Generation Avg generation ~ 1.1M MWhr/yr

  23. Project Operations Overview Questions

  24. PCWA MAY 16, 2006 HANDOUT #4 Middle Fork Project Project Operations Overview May 2006

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