Hydroelectric Energy is renewable.
The Sun provides the water by evaporation from the sea, and will keep on doing so.
Flowing water creates energy that can be captured and turned into
electricity. This is called hydroelectric power or hydropower. It is the
most widely used form of renewable energy, accounting for 16 percent of
global electricity consumption, and 3,427 terawatt-hours of electricity
production in 2010, which continues the rapid rate of increase
experienced between 2003 and 2009.
Hydropower is produced in 150 countries, with the Asia-Pacific region
generated 32 percent of global hydropower in 2010. China is the largest
hydroelectricity producer, with 721 terawatt-hours of production in
2010, representing around 17 percent of domestic electricity use. There
are now three hydroelectricity plants larger than 10 GW: the Three
Gorges Dam in China, Itaipu Dam in Brazil, and Guri Dam in Venezuela.
The cost of hydroelectricity is relatively low, making it a
competitive source of renewable electricity. The average cost of
electricity from a hydro plant larger than 10 megawatts is 3 to 5 U.S.
cents per kilowatt-hour. Hydro is also a flexible source of electricity
since plants can be ramped up and down very quickly to adapt to changing
energy demands. However, damming interrupts the flow of rivers and can
harm local ecosystems, and building large dams and reservoirs often
involves displacing people and wildlife and requires significant amounts
of carbon-intensive cement. Once a hydroelectric complex is
constructed, the project produces no direct waste, and has a
considerably lower output level of the greenhouse gas carbon dioxide
(CO2) than fossil fuel powered energy plants.continue @ ugreen.me
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