Hydro-electric power is currently the world's largest renewable source of electricity, accounting for 6% of worldwide energy supply or about 15% of the world's electricity. However, in some countries, hydro-electric power is a lot more common, for example, in Canada, where HEP supplies 60% of the electricity needed. Traditionally thought of as a cheap and clean source of electricity, most large hydro-electric schemes being planned today are coming up against a great deal of opposition from environmental groups and native people.
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