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renewable energy any form of energy that is naturally replenished within a human lifetime, such as solar energy or wind power.
solar battery a system of photovoltaic cells that converts solar energy into electricity.
solar pond a pond with a top layer of fresh water and a bottom layer of dense hot salty water, used to trap solar energy for use in heating or to generate electricity.
solar still a system or apparatus for purifying salt water by distilling it through the use of solar energy.