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You need lots of water and a lot of land where you can build a dam and reservoir, which all takes a LOT of money, time, and construction. The trend for the future will probably be to build small-scale hydro plants that can generate electricity for a single community.

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Graph

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National

Geographic Area:

United States

Grand Coulee Dam on Columbia river, Washington

Submitted by yufang1104 on Fri, 08/17/2012 - 10:53am

Source:

www.wikipedia.com

Image:

Grand Coulee Dam on Columbia river, Washington

Of the renewable energy sources that generate electricity, hydropower is the most often used. It accounted for 7 percent of total U.S. electricity generation and 73 percent of generation from renewables in 2005.

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Not Applicable

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Picture/Photograph

US Cumulative Solar Capacity Growth

Submitted by yufang1104 on Fri, 08/17/2012 - 10:51am

Source:

www.wikipedia.com

Image:

In recent year, the growth of cumulative solar capacity increases significantly.

Level:

Global

Image Type:

Graph

Glocal Installed Wind Capacity 2005-2009

Submitted by yufang1104 on Fri, 08/17/2012 - 10:45am

Source:

www.wikipedia.com

Image:

Glocal Installed Wind Capacity 2005-2009

According to graphs, you can see that after 2005 the total wind power capacity soars and the top three country contribute to this increase are US, China and Germany.

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