Geothermal energy generation appears to be growing in leaps and bounds. The statistics quoted come from an advocacy group, so I'm not sure just how much they can be trusted. Still, if it's roughly as cheap as coal that means it can, presumably, replace the stuff. Then we get to watch the fireworks as the green side of the Democratic party gets in a scuffle with the organized labor side. What, you think those unionized miners are going to take this lying down?