What is Geothermal Energy?

What is Geothermal Energy?

Geothermal heat is naturally generated deep below the earth’s surface. This heat is the world’s largest source of continuous renewable energy. With at least an order of magnitude more energy than coal, oil, and gas combined, geothermal can scale to accelerate the transition from fossil fuels to renewable energy.1 Equally important, geothermal projects supply renewable power around the clock, emits little or no greenhouse gases, and have the smallest footprint per unit of output than any alternative renewable energy technology.

Geothermal energy can be used in a variety of ways. The most prevalent application for high temperature geothermal is generating clean, renewable electric power. Other applications are being developed for hydrogen production, lithium extraction, and heat or power intensive industrial applications. Low temperature geothermal energy can be used for heating buildings, greenhouses, and other structures.

Paradoxically, geothermal energy is greatly underutilized, comprising only about 1% of the U.S. energy portfolio. The enormous disparity between the geothermal power potential and usage is due to the physical limitations of conventional geothermal power that constrain development to roughly 2% of heat resources that are found in highly permeable subsurface formations.2 Additionally, the industry is hobbled by a difficult business model characterized by long time frames and high risk as globally 22% of drilled wells are unproductive at the outset or over time.

Geothermal energy represents a reliable, secure, clean, and nearly inexhaustible baseload energy source. The current domestic installed capacity is over 3.8 gigawatts (GW). Current estimates of technically recoverable resource potential include an estimated 30 GW of new undiscovered hydrothermal resources and 100+ GW of new geothermal energy accessible…”

U.S. Department of Energy3

Geothermal Energy Benefits