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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.
The UK Government plans to increase the proportion of our electricity that is generated from renewable sources. Renewables, such as wind and solar, are intermittent energy sources. This has implications for the overall predictability of our electricity supply, and back-up sources of generation will be needed. The Government has signed up to the European Union's Renewable Energy Directive, which commits us to generating 15% of our energy from renewable sources by 2020 â including for electricity, heating and transport.