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 HYDROELECTRIC POWER
Power obtained from the natural movement of masses of water. Hydroelectric power plants convert the energy contained in flowing water, like rivers and streams, into electricity. Low impact hydro plants producing less than 30 Megawatts are often considered renewable sources of electricity. Larger hydro projects, known as high impact, cause concern because dams can change natural river flows, degrade water quality and block fish migration. Hydropower currently provides about 10 percent of the electricity generated in the world - a percentage unlikely to increase dramatically, both because few new sites remain for the construction of large dams and because of general opposition to building large new facilities on environmental grounds.
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