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Energy sources that do not rely on the consumption of an exhaustible fuel. Tidal, geothermal, and the direct and indirect solar energies (direct: photovoltaics, CSP, solar thermal; indirect: wind, wave, biomass) are renewable energy.

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Yes, it can be done and it is done. It is called pumped-storage hydroelectricity. When there is a surplus in electric energy available (e.g. during the night, when people sleep and factories are not …
answered Jan 12 '17 by loewe