Geothermal Energy Learn more about geothermal energy with SaveOnEnergy!Written by Erin Gobler Edited by Caitlin RitchieGeothermal Energy OverviewGeothermal energy is a renewable resource that is created from the heat within the earth. Geothermal energy is used for both heating and cooling applications. Geothermal energy is the smallest source of renewable energy in the United States after biomass, wind energy, hydroelectric, and solar power. It makes up just 0.4 percent of electricity generated in the country.Want to learn more about geothermal energy in the United States? In this article, we’ll explain how geothermal energy works, what it’s used for, how much geothermal energy costs, and more.Table of contentJump toContentsJump toView more