If you think hydroelectric power only comes in valley dominating sizes, think again. There are various kinds of small scale hydro-electric power systems. The typical such installation is a homeowner in the woods who has a permanent stream running across their land. If they can capture the water the right way, they can run it through a small generator and get some power.
This gravitational vortex thing is a similarly sized idea. But it's very high efficiency, does not create a danger to fish, and improves water quality by adding oxygen (aerating the water). Very interesting.
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