About 5 percent
approximately 20 percent
The hydroelectric power generated at Hoover Dam is allocated primarily to southern California, and also to the states of Nevada and Arizona. See:http://en.wikipedia.org/wiki/Hoover_Dam
Electric power industry and manufacturing rely on hydro power. Most of the electricity that is generated by hydroelectric plants in the United States of America use hydro power.
Fossils fuels
In 2006- coal 49.1 percent, nuclear 19.4 percent, hydro 7.0 percent, solar 0.1 percent (source Wikipedia)
Geothermal electricity production in the US was 0.30 percent in 2006
Currently (2010) around 2.4% This number is increasing yearly because of new installations of wind turbines. These are often constructed in areas with low population density and with high average wind speeds. In 2009 about 1.8 percent of the electricity generated in the United States was generated by wind power. This amount has been increasing by a fraction of a percent each year for the last several years. Texas generates the most power by wind of any state, over 14 billion kilowatt-hours in 2009. Iowa generates the most power by wind as a percentage of all the electricity generated in the state, 14.2% in 2009.
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There are many states that have potential to use hydroelectric power. One of the states that have the greatest potential is Alaska.
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, and has a considerably lower output level of the greenhouse gas carbon dioxide (CO2) than fossil fuel powered energy plants. Worldwide, hydroelectricity supplied an estimated 816 GWe in 2005. This was approximately 20% of the world's electricity, and accounted for about 88% of electricity from renewable sources.Industrial hydroelectric plantsWhile many hydroelectric projects supply public electricity networks, some are created to serve specific industrial enterprises. Dedicated hydroelectric projects are often built to provide the substantial amounts of electricity needed for aluminum electrolytic plants, for example. In the Scottish Highlands of United Kingdom, there are examples at Kinlochleven and Lochaber, constructed during the early years of the 20th century. The Grand Coulee Dam, long the world's largest, switched to support Alcoa aluminum in Bellingham, Washington, United States for American World War II airplanes before it was allowed to provide irrigation and power to citizens (in addition to aluminum power) after the war. In Suriname, the Brokopondo Reservoir was constructed to provide electricity for the Alcoa aluminum industry. New Zealand's Manapouri Power Station was constructed to supply electricity to the aluminum smelter at Tiwai Point. As of 2007 the Kárahnjúkar Hydropower Project in Iceland remains controversial.
19% of the world's energy comes from hydro power. In 2008 6% of the United States' energy came from hydro power.
There area little over 850 Hydroelectric Power plants in the United States