, the philanthropic arm of the search giant, has announced a $10.25 million investment in geothermal energy technology. The money will back two start-up companies that specialize in enhanced geothermal systems (EGS), the process of pumping water underground to crack hot rocks and use the resulting steam to power a turbine and create electricity. “EGS could be the ‘killer app’ of the energy world,” says Dan Reicher of “It has the potential to deliver vast quantities of power 24/7 and be captured nearly anywhere on the planet. And it would be a perfect complement to intermittent sources like solar and wind.” Geothermal currently supplies a mere 0.5 percent of global energy supply and 0.4 percent of U.S. supply. The investment is a part of’s RE<C effort, which has an end goal of making renewable energy cheaper than coal. We hope coal is quakin’ in its dirty black boots.