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Hydroelectricity, Dammed Reservoir 
Hydroelectricity, Dammed Reservoir 
Generating approximately 20% of the world’s electrical energy, hydroelectricity is by far the most established form of renewable energy. It accounts for more than 80% of all renewable energy installed capacity.

Conventional hydroelectricity uses dam structures to limit the flow of existing rivers. By selectively releasing water through turbines in the dam, the tremendous pressure of the water is converted to electrical energy.

There are many ecological side effects of interrupting the flow of existing rivers which has led to the deconstruction of many hydroelectric dams and has resulted in a decrease in construction of new hydroelectric facilities. The damming of a river causes the upstream side to flood large areas of land, disrupts fish spawning activities, and changes the characteristics (temperature, oxygen content, and silt content) of the downstream water. Dams also come with the risk of structural failure and the resulting severe downstream flooding.