Solar power stations
Hudreds of mirrors are arranged across the tall tower. As the the sun moves across the sky,the mirrors turn so that they are always facing the sun. The mirrors reflect the sunlight to the top of the tower. It gets very, very hot. Liquid salt at the top of the tower is heated by the sunlight. The hot liquid is used to make steam. The steam turns a turbine. A turbine turns a generator. The generator makes electricity.
Solar power stations are very expensive to build but the energy they use - sunlight - costs nothing at all.
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