100 Emission-Free Gigawatts in 40 Years For $1 Billion
So called hot dry rock geothermal technology has the potential to be a huge generator of emissions-free technology for a relatively steep initial investment but very low ongoing costs. The basic concept is simple — dig a big hole in the ground to where the granite is very hot, pump in water, and let the resultant steam power a turbine. [photo by futureatlas] [slashdot]
