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Hydroelectricity Vortex Power
Hydroelectricity, Vortex Power
When you place obstacles in the path of flowing water, it creates vortices or small turbulent spinning movements within the fluid. Recent research into harnessing these vortices has made some very rapid progress.

This is perhaps the hydro power least damaging to the environment since the installations are no more impactful to wildlife than natural obstacles along the path of water in a riverbed or ocean floor.