sherburne said: (quoted from post at 06:28:14 05/01/08) Any idea of the efficiency of the "pump and store potential energy" is?
Water must be pumped up by a lift pump(efficiency <100%) and then sent through a hydro-electric turbine(efficiency<100%) to recover the power.
It is utilized as a giant storage battery. At night when power usage is down TVA pumps water up the mountain to the lake. Then during peak usage times, instead of buying power from other sources, TVA brings the pumped storage facility online to generate power. It isn't 100% efficient but it is still cheaper than buying power from another utility.
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