There are currently around 46 countries using geothermal power. The power can be generated using temperatures as low as 73 degrees Celsius by using a binary agent such as a hydrofluorocarbon. Check out the following links:
http://www.technologyreview.com/Energy/17524/
http://www.yourownpower.com/Power/
There are currently around 46 countries using geothermal power....
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