Per the AMA, the big issue with pumped hydro is you need a good 150m+ worth of head and a big ass area to store a lake worth of water. The larger the elevation, the less water is needed per given unit of power. It's not practical on a small scale. You also need a lake's worth of water to move every day. Here's one the utilities around here use.
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Plant specs
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Plant specs
Rocky Mountain Hydroelectric Plant - Wikipedia
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