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| Salina Pumped Storage Project ： ウィキペディア英語版 |
Salina Pumped Storage Project
The Salina Pumped Storage Project is a pumped-storage power station near Salina, Oklahoma. It is owned and operated by the Grand River Dam Authority (GRDA). Its construction was in response to growing power demands and a lack of dam sites on the Grand River. The first phase was completed in 1968 and the second in 1971. The upper reservoir for the power station is Lake W. R. Holway which was built on Saline Creek and the lower reservoir is Lake Hudson on the Grand River. During periods of lower power demand, water is pumped from Lake Hudson to Lake Holway and released back down through the pump-generators during periods of high energy demand.〔Wagman, David. ''Power Engineering''. "Salina Pumped Storage Project." May 1, 2006. Retrieved September 17, 2011.()〕
==Design philosophy==
The process essentially consists of pumping water from a lower elevation into a containment at a higher elevation. In this step, the mechanical device used to move the water acts like a conventional pump to lift the water. External power, in this case an electric motor, supplies the needed energy. Later, the external power is switched off and water flows backward through the device, enabling it to function as a hydraulic turbine generating energy to drive an electric power generator. Ideally, the power generated would offset the power consumed in elevating the water. In practice, there are inefficiencies in the system that cause the power consumed raising the water to significantly exceed the energy generated during the reversal of water flow. GRDA has stated that pumping water from Lake Hudson (the source) into Lake W. R. Holway (the receiver) consumes nearly twice the power that can be recovered from the hydraulic generator. The real benefit from the process is that the owner can use power for pumping when overall power demand from customers is lower, and supply electric power when customer demand is higher. It is an effective way to provide peaking power because the system can be brought on line (or taken off line) very quickly.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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