Geothermal is the hottest thing in clean energy. Here’s why (Maria Gallucci, 25 March 2024, Canary Media)

Solar, wind power and battery-storage projects are already cleaning up the U.S. electrical grid. But energy analysts warn that these technologies might not be enough on their own to fully buck America’s reliance on fossil-fuel-burning power plants, which are the second-largest source of U.S. greenhouse gas emissions after transportation. The grid also needs carbon-free electricity available on demand to guarantee it can provide the sort of 24/7 power needed by cities, data centers and industrial facilities like aluminum smelters or steel mills.

At the moment, however, these so-called ​“clean, firm” sources remain elusive. Recent advances in geothermal technologies, demonstrated by a handful of real-world projects, suggest that harnessing the earth’s heat could be among the most promising ways to solve this clean-energy conundrum. But that can only happen if it can overcome the sizable challenges that stand in its way.

“If we can crack the nut on this new-generation geothermal, it means we can put geothermal just about anywhere,” Cindy Taff, CEO of the Houston-based startup Sage Geosystems, said during a March 9 panel at SXSW in Austin, Texas.