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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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The largest hydroelectric power station in the world is the Three Gorges Dam in China.

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Hydroelectricity provides about seven percent of the electricity generated in the United States and about half of the electricity from all renewable sources

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

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Lake Norman, the state’s largest man-made lake, was built by Duke Energy in 1963 by damming the Catawba River with Cowans Ford Hydroelectric Station

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There are four Lake Norman counties that border Lake Norman; Lincoln County, Mecklenburg County, Catawba County and Iredell County. They meet in the middle of the lake.