A project that was supposed to show the potential of turning the heat from hot rocks deep in the earth into a clean power source, from a startup backed by Google.org, Kleiner Perkins, Khosla Ventures and the Department of Energy, has hit a snag — literally. Geothermal startup AltaRock Energy said yesterday that it has “encountered a number of physical difficulties,” while drilling at a site in Northern California, or as the New York Times put it, the drilling snagged on surface rock formation. As a result, the $17 million drilling project, which started in June, is being suspended indefinitely, the company says.
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