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Middle Fork Project Potential Project Betterments

Middle Fork Project Potential Project Betterments. October 1, 2007. Potential Project Betterments. PCWA’s evaluation of potential betterments has continued over last year Three betterments will be included in the PAD Hell Hole Reservoir Seasonal Storage Increase

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Middle Fork Project Potential Project Betterments

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  1. Middle Fork Project Potential Project Betterments October 1, 2007

  2. Potential Project Betterments • PCWA’s evaluation of potential betterments has continued over last year • Three betterments will be included in the PAD • Hell Hole Reservoir Seasonal Storage Increase • French Meadows Powerhouse Capacity Upgrade • Ralston Powerhouse Capacity Upgrade

  3. Betterments Analysis for Relicensing Flow Chart Initial data collection & screening - Conceptual design work PCWA inventory of potential betterments Betterments to carry forward in relicensing Project Description, June 2006 We are Here Include viable projects in License Application Engineering/environmental studies and agency/public consultation 2007-2010

  4. Hell Hole Reservoir Seasonal Storage Increase • Purpose • Increase seasonal storage in Hell Hole Reservoir by 9,750 - 12,000 acre-feet.

  5. Hell Hole Reservoir Seasonal Storage Increase • Hell Hole Dam Spillway Crest Gates • Hell Hole Dam Spillway Crest Gate Control Building and Powerline near Hell Hole Dam • Parapet walls at Hell Hole Dam, Hell Hole- Middle Fork Tunnel Gatehouse, and French Meadows Powerhouse • South Fork Long Canyon Diversion crest gates or check valve • Generator Building at SouthFork Long Canyon Diversion Dam Changes to Project Facilities

  6. Hell Hole Dam Spillway

  7. Hell Hole Reservoir Seasonal Storage Increase Operations • Wet Years with Spills • 9,750 -12,000 acre feet of additional water would be stored • Net generation increased • Inundation within the existing reservoir flood inundation zone – increase by approximately 37 acres

  8. Hell Hole Reservoir Seasonal Storage Increase Operations • Non-spill years • 9,750 – 12,000 acre feet of additional storage could be used to defer early generation releases • Peaking generation increased • Reservoir inundation area temporarily increased by approximately 37 acres

  9. Hell Hole Reservoir Seasonal Storage Increase Operations • Dry Years • Water not available for seasonal storage

  10. French Meadows PowerhouseCapacity Upgrade • Purpose • Increase MFP peaking generation capability • Provide Ancillary Services to the energy market

  11. French Meadows PowerhouseCapacity Upgrade Changes to Project Facilities • French Meadows-Hell Hole Tunnel Intake Trash Rack • Second generation unit and penstock at French Meadows Powerhouse • Tunnel Surge Capacity at French Meadows – Hell Hole Tunnel (Surge shaft/tank or surge pipeline) • Temporary upgrade of Forest Road 14N09A

  12. French Meadows PowerhouseCapacity Upgrade Changes to Project Facilities (continued) • Project Road from Forest Road 14N09A to tunnel surge capacity facilities • Add transformers/switching equipment to the French Meadows Powerhouse Switchyard • Upgrade Transformers/Switching Equipment at Middle Fork Powerhouse Switchyards

  13. French Meadows PowerhouseCapacity Upgrade Operations • All Water Year Types • Run one or both units • Increase transfer capability between French Meadows and Hell Hole reservoirs • Increase generation during peak energy demand period • Provide Ancillary Services while on standby or running at partial load

  14. Ralston PowerhouseCapacity Upgrade • Purpose: • Increase powerhouse operating efficiency • Improve Synchronized Operations with Middle Fork Powerhouse

  15. Ralston PowerhouseCapacity Upgrade Changes to Existing Project Facilities • Upgrade Ralston Powerhouse mechanical and electrical systems • All modifications within the existing powerhouse

  16. Ralston PowerhouseCapacity Upgrade • Wet Years • Increase generation during peak energy demand periods • Dry Years • May increase generation during peak energy demand periods

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