The geothermal version of fracking?

Check it out:

http://www.bloomberg.com/news/2011-10-06/california-s-underground-hot-rocks-probed-for-energy-of-100-nuclear-plants.html

Not only could I see issues with bringing possibly radioactive water back to the surface, but here are some other issues they mention in the article:

Blowouts and Earthquakes

While a handful of small EGS plants are operating overseas, some have experienced setbacks ranging from blowouts to minor earthquakes caused by fracturing rocks deep underground. A project in Switzerland was shut down in 2006 after residents nearby started feeling tremors and voiced concerns that the installation may destabilize surrounding areas.

In September 2009, Seattle-based AltaRock Energy Inc. suspended a project at The Geysers due to drilling problems. Geodynamics Ltd. shut down a test in southern Australia after an uncontrolled leak in April of that year.

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