Where Clean Energy Dollars Went in 2013

By Eric Roston - 2014-04-07T18:19:47Z

Photograph by Alessia Pierdomenico/Bloomberg

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8. Geothermal Energy

Scratch away its surface and the Earth is a ball of heat, providing more energy than we can tap. That's the promise of geothermal power. 

Companies are drawn to the energy source in places where it's easy to tap, like Iceland, and urgently where new sources of power are needed quickly, like Japan. 

Investors put $3.2 billion into geothermal in 2013, a 2 percent increase over the previous year.

Left: An employee inspects the inside of a cooling tower at a geothermal power station operated by Enel Green Power SpA, in Monterotondo Marittimo, Italy, in May 2013. 

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