Some quick facts about the Hook Canyon Pump Storage Project
(from the PAD and SD1 FERC P-12707) printable PDF
The project will generate 3,245,872 MWh
annually and has a generating capacity of 1,120 MW.
It will consume an estimated 4,057,340 MWh to (pump the water up)
for a net energy loss of 811,468 MWh annually.
Upper Reservoir
• Dam will be 270 ft. high (water will be approx. 240 ft. deep when at 19,510 AF capacity)
• Maximum storage capacity of 21,857 acre feet of water
• Useable storage is 19,510 acre feet. Max. available volume is 15,400 AF
• Hydraulic head is 940 ft. at max reservoir elevation and 825 ft. at minimum elevation
• Surface area of 225 acres
• Proposed 20 ft. of water as a temperature buffer to minimize temperature impacts to Bear Lake
Emergency spillway will be excavated to the south to flow down South Eden Canyon
• Max. capacity 2000 cfs
• 30 ft. wide on a 5 degree slope
Access to reservoir and emergency spillway is via South Eden road and a new 3.5 mi. long road
Powerhouse
• Underground
• 14 reversible pump turbines
Operation
• 10 hours of power generation (8 normal + 2 hrs. of reserve)
• Flow rate at each turbine is between 1,265 cfs and 1,786 cfs (max. for 14 would be 25,004 cfs)
• Average flow rate is 18,636 cfs
• 15,400 acre feet will be exchanged daily- that is 5 billion gallons. In other words, a million gallons, five thousand times
• Estimated daily fluctuation of Bear Lake is 2.64 to 3.18 inches
Construction
• A 40 ft. diameter vertical shaft 700 ft. long from the bottom of the reservoir
• Connecting to a 40 ft. diameter tunnel 3000 ft. long ending at the powerhouse
• Then a 2500 ft. long 30 ft. diameter tailrace tube to discharge the water into Bear Lake
• Discharges water into Bear Lake at a point where the lake depth is about 120 feet deep
Transmission Lines
• 9 miles of 230 kv transmission lines connecting in Idaho to PacifiCorp’s existing grid
• Two 8-acre substations
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