Geothermal energy is contained in underground reservoirs of
steam, hot water, and hot dry rocks. Geothermal power is cost
effective, reliable, environmentally friendly, and sustainable.
Recent advances in technology have expanded the size and range of
geothermal power applications. At electric generating facilities,
hot water or steam is drawn from geothermal reservoirs in the
Earth's crust and is supplied to steam turbines at electric
utilities that drive generators to produce electricity.
Moderate-to-low termperature geothermal resources are used for
direct-use applications such as district and space heating. Lower
temperature, shallow ground, geothermal resources are used by
geothermal heat pumps to heat and cool buildings.