According to a new study commissioned by the U.S. Energy Department, a process called enhanced geothermal systems could affordably harvest heat locked in deep layers of granite that exist almost everywhere on earth. The technique involves drilling several holes — some two to three miles deep — into granite that has been held at temperatures around 400 degrees or more, by insulating layers of rock above.
Read the full story in the New York Times.
Check out the Energy Department Report.
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