Geo-Thermal Energy

“This is energy available as heat emitted from within the earth’s crust, usually in the form of hot water or steam.” (IEA) In the U.S. geothermal energy is often used at the household or campus level.

In terms of a country or region that uses this to a large extent: the unique geology of Iceland allows for 25% of its total electricity production to come from geothermal power facilities. (National Energy Authority of Iceland)