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Eco-Glossary

Hydropower

 
Hydropower (also called hydroelectric power or hydroelectricity) is electricity generated by Earth's water cycle. Water evaporates from Earth's surface, forms clouds, precipitates back to Earth and flows toward the ocean. The movement of water as it flows downstream creates kinetic energy that can be converted into electricity. A hydroelectric power plant converts this energy into electricity by forcing water, often held at a dam, through a hydraulic turbine that is connected to a generator. The water exits the turbine and is returned to a stream or riverbed below the dam.
 
Hydropower is mostly dependent upon precipitation and elevation changes; high precipitation levels and large elevation changes are necessary to generate significant quantities of electricity. Because it is generated by Earth's natural water cycle, hydropower is considered a renewable energy resource. (Source: EPA / Photo: Flickr)

Recent Stories


Greenpeace pokes Facebook over data center

Mon, Mar 15 2010 at 1:51 PM EST

Social networking giant is under pressure to switch from coal to renewable power, but are other offenders being overlooked?


The lessons of 'Avatar' for sustainable hydropower

Thu, Mar 04 2010 at 3:07 PM EST

Nature Conservancy scientist discovers a new ending to the script of 'Avatar' -- and wonders if the Battle for Hometree even needed to be fought.


Huge hydroelectric dam approved in Brazil's Amazon

Tue, Feb 02 2010 at 10:12 AM EST

Project raises concern about impact on environment and native Indians.


Hydropower industry braces for glacier-free future

Wed, Oct 21 2009 at 8:29 PM EST

Major source of hydroelectric power is in jeopardy as glaciers recede; experts predict ice flows will disappear by the end of the century.


Utility agrees to terms removing Klamath dams

Wed, Sep 30 2009 at 7:06 AM EST

The dams block salmon from returning to their breeding grounds and caused toxic algae to grow in the river's waters.


64 missing workers feared dead in Russian accident

Tue, Aug 18 2009 at 10:55 AM EST

Defect in turbine system at hydroelectric plant likely to blame for workers' deaths, vast oil slick and widespread power shortages.


Safety concerns at huge China dam project

Tue, Jul 21 2009 at 8:00 PM EST

State media reports that builders could be taking dangerous shortcuts while charging over 10 million yen in illegal fees.


Turkey pushes ahead with controversial dam projects

Mon, Jul 06 2009 at 8:00 PM EST

Proposed dams are opposed on environmental as well as political grounds.


China will review planned dam that threatens fish

Thu, Jun 25 2009 at 6:38 AM EST

An environmental harm assessment has been ordered before construction can begin on the new hydropower project.


How is the Three Gorges Dam impacting the environment?

Mon, Jun 08 2009 at 9:09 PM EST

The Yangtze River in China is piling up behind the massive Three Gorges Dam. Now satellite photos show us exactly how the rising waters are changing the ecosystem.


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