You are here


Geothermal energy plant at The Geysers near Santa Rosa in Northern California, the world's largest electricity-generating geothermal development. | Photo courtesy of the National Renewable Energy Laboratory.

Geothermal energy is heat derived below the earth’s surface which can be harnessed to generate clean, renewable energy. This vital, clean energy resource supplies renewable power around the clock and emits little or no greenhouse gases -- all while requiring a small environmental footprint to develop.

The Energy Department is committed to responsibly developing, demonstrating, and deploying innovative technologies to support the continued expansion of the geothermal industry across the United States.


Pinpointing America’s Geothermal Resources with Open Source Data
A geothermally-heated greenhouse just west of Newcastle, Utah. The National Geothermal Data System -- a new, interactive open source data tool -- is helping researchers and industry identify more geothermal resources across America. | Photo by Robert Blackett, NREL.

How can we leverage our vast geothermal resources? Knowing where to look is half the battle.

A Michigan County Unearths Savings with Geothermal Energy
Kent County Correctional Facility is saving energy and money with a new closed-loop geothermal system. | Photo courtesy of Kent County Administrator's Office.

Learn how Kent County, Michigan, is saving energy and money by using renewable energy.

Calpine: America's largest geothermal energy producer
Calpine operates 15 plants at The Geysers in northwest California, which generate enough clean energy daily to power a city the size of San Francisco.| Photo Courtesy of Calpine

Since 1960, steam from the 45 square mile field spanning Lake and Sonoma counties has been extracted to drive turbines and generate baseload renewable electricity. Fifty years later, Houston-based Calpine Corporation operates 15 geothermal plants at The Geysers.