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Well, this is something!
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Meanwhile in Germany:
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this post was submitted on 25 Oct 2023
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Could a dam lake be counted as hydro storage? That wouldn't require energy spending to pump water up, but it can work as a "cache"?
Nope, that's just regular hydroelectric. All hydro power plants have valves to control the flow and they do adjust them on demand, for turbine/filter maintenance, and/or hydrological event control.
Also, dam lake is a misnomer because lakes are naturally occurring. The correct term is reservoir. However, a reservoir can be natural and not dammed, like the oldest Czech pumped storage power plant at Černé jezero, which I visited. (The reservoir is a beautiful mountain lake and unfortunately, nature preservationists capped the water level changes to 4 cm, limiting capacity.)
Yeah I didn't know the correct term for it in English, in Finnish it's called "fakelake" or maybe more accurately "artificial lake", but fakelake sounds better
Then there are ponds and pools, which can be either natural or artificial.