What is Geothermal?
Geothermal Energy Basics
This variety of geothermal resources allows them to be used on both large and small scales. A utility can use the hot water and steam from reservoirs to drive generators and produce electricity for its customers. Other applications apply the heat produced from geothermal directly to various uses in buildings, roads, agriculture, and industrial plants. Still others use the heat directly from the ground to provide heating and cooling in homes and other buildings.
Other geothermal resources exist miles beneath the earth's surface in the hot rock and magma there. In the future, these resources may also be useful as sources of heat and energy.
Geothermal Energy Technical Site
Idaho National Laboratory
Geothermal Technologies Program
U.S. Department of Energy
Geothermal Heat Pumps
EERE Consumer's Guide to Energy Efficiency and Renewable Energy