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Hydroelectric Power | Send-To | Print | More
[syn: HEP]
Category: Environment | 1035 views
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© Encyclopedia of Atmospheric Environment
On Earth, water is neither created nor destroyed, but is constantly moved around. Water evaporates from the oceans and other freshwater bodies such as rivers and lakes, and is stored by the atmosphere. Under certain weather conditions water vapour in air condenses to form clouds, and eventually precipitates out as rain, snow, sleet and hail. This precipitation collects into streams and rivers, and flows back to the sea. This is known as the water cycle.All this movement provides an enormous opportunity to create useful energy. Hydroelectric power (HEP) uses the force of moving water to create electricity. However, HEP stations often require large dams, which can disrupt ecosystems and displace people. Large-scale HEP currently accounts for about 20% of the world's electricity supply.
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