It's actually been around for some time, with numerous geothermal power plants in California, Nevada and a few other western states. There are new plants on the drawing board, too. Unfortunately, the recession has stifled the construction progress on many of them.
But all that's about to change. Thanks to a few key technological developments - and a big cash infusion from the government - the stars are aligning to produce the perfect storm for this super-green energy source.