"That new "app", called enhanced geothermal systems (EGS), improves upon the century-old technology of tapping geothermal energy from geysers or hot springs to generate electricity. With EGS, engineers drill shafts down to hot rocks and pump in water to create steam to power a turbine.
The bulk of Google's first geothermal investment, $6.25 million, will help finance EGS company AltaRock Energy of Sausalito, California. The firm has also attracted money from some of the best known Silicon Valley venture capitalists.
A further $4 million of Google's money will go to Potter Drilling in Redwood City, California, which has a hard rock drilling technology."
Earlier in the year, the US Department of Energy released the results of a 8 month study on EGS
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