El Salvador, Iceland, and the Philippines get 26 percent, 25 percent, and 18 percent, respectively, of their electricity from geothermal power plants.
The US has huge geothermal resources, which is used could theoretically power the entire country. But the process does make me a bit twitchy.
Geothermal electricity technology involves drilling down to the hot rock layer, fracturing the rock and pumping water into it, and then extracting the superheated water to drive a steam turbine.
What could that do to aquifers? Also, geothermal drilling has triggered earthquakes in Switzerland. Still, if perfected and safe, geothermal energy could provide enormous amounts of renewable energy on a 24/7 basis.