This has been tried. So far unsuccessfully, for practical challenges see http://www.ipsnews.net/2013/08/geothermal-energy-stuck-in-a-hole-in-switzerland/ http:

This has been tried. So far unsuccessfully, for practical challenges see http://www.ipsnews.net/2013/08/geothermal-energy-stuck-in-a-hole-in-switzerland/ http://www.ipsnews.net/2013/08/geothermal-energy-stuck-in-a-...