Geothermal Energy: energy harvested from heat naturally stored/produced underground
According to this CleanTechnica.com article Search engine giant Google is investing $10.25 million into Enhanced Geothermal Systems, a promising new energy technology. A very interesting fact to quote is:
"According to an MIT report on EGS, only 2% of the heat beneath the continental US between 3 and 10 kilometers (depths we can reach with current technology) is more than 2,500 the annual energy use of the United States."
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