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Yes, gravity is used in hydroelectric schemes when water is run down chutes to drive water turbines which drive electric generators. Hydro depends on the Sun's energy to evaporate water from the ocean and deposit it as rain in the mountains.

There is no inherent energy in the gravitational force. The water is lifted up against gravity, gaining potential energy, and then it runs down under the same force to exchange the potential energy for kinetic energy which drives the turbine.

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