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Is it because of this?

Google on Tuesday took the drilling debate in a different direction - announcing that Google.org is investing nearly $11 million in technology to expand the nation's geothermal reserves. That's more than the U.S. government is spending on geothermal projects this year.

Traditional geothermal power plants, like those built by Calpine (CPN) in Northern California, sit atop reserves of naturally occurring steam or hot water that can be tapped to drive electricity-generating turbines. So-called Enhanced Geothermal Systems, or EGS, hope to tap geothermal energy in any location by drilling deep underground to fracture "hot rocks" and then pump them with water to create steam that can be used in a power plant. The great potential, of course, would be to liberate the Midwest and South from their dependence on coal-fired power plants

http://greenwombat.blogs....ng-for-geothermal-energy/