What about using gravity to generate power?

My power bill has gone up to 300 dollars a month. got me thinking about power generation. in my area i think it's feasible to create a series of manmade rivers and lakes that support hydropower generators. have a lake that dumps into a man made river, powers some generators, when water flow slows, have the water dump into another manmade lake, which dumps into another man made river. essentially using gravity to power the grid

Yes good idea
Nope solar etc is a better idea
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What about using gravity to generate power?
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