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China has one of the largest hydroelectric power station in the world

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Hydroelectricity is a renewable energy but the building of the large facilities needed to make it can have negative effects on the environment

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Most hydroelectric power stations use water held in dams to drive turbines and generators which turn mechanical energy into electrical energy

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In 2006, hydroelectricity supplied around 20% of the world’s electricity

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Generates electricity by harnessing the gravitational force of falling water

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Uses the energy from moving water for a variety of useful applications