BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Hoover Dam. Aerial view of the Hoover Dam, a hydroelectric power facility on the Colorado River, Nevada, USA. This dam produces 4 billion kilowatt-hours of power every year. Hydroelectric power harnesses the energy in flowing water. The Hoover Dam stores water in a reservoir (upper left). From here it flows into a power plant, rotating the turbines which drive electricity generators.
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