Hydroelectricity is the term referring to
electricity generated by
hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of
renewable energy, accounting for 16 percent of global electricity generation – 3,427
terawatt-hours of electricity production in 2010, and is expected to increase about 3.1 ach year for the next 25 years.