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Hydroelectricity is electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy. Once a hydroelectric complex is constructed, the project produces no direct waste.
Most of this growth will come from non-OECD (non-Organization for Economic Cooperation and Development) countries, where demand is driven by strong economic growth. Renewable energy and nuclear power are the world's fastest-growing energy sources, each increasing 2.5% per year. In the Reference case, the renewables share of total energy use rises from 11 percent in 2010 to 15 percent in 2040, and the nuclear share grows from 5 percent to 7 percent. Almost 80 percent of the projected increase in renewable electricity generation is fueled by hydropower and wind power.