Geothermal
Asia-Pacific Economic Cooperation (APEC)

European Commission - Eurostat
Geothermal energy comprises energy available as heat emitted from within the earth's crust, usually in the form of hot water or steam. It is exploited as suitable sites for electricity generation using dry steam or high enthalpy brine after flashing or directly as heat for district heating, agriculture, etc.

International Energy Agency (IEA)
Energy available as heat emitted from within the earth’s crust, usually in the form of hot water or steam. It is exploited at suitable sites:

- for electricity generation using dry steam or high enthalpy brine after flashing

- directly as heat for district heating, agriculture etc.

Latin American Energy Organization (OLADE)
Geothermal energy is stored under the earth’s surface in the form of heat, which can be transmitted to the surface through a fluid that is in contact with the heated rock. This fluid is generally made up of water in liquid state, steam, or a combination of both. Only the portion of this energy source that is used in power generation is considered.

All geothermal heat exploited for electricity generation or as direct energy use. Production (TJ) is the difference between the enthalpy of the fluid produced in the production borehole and that of the fluid eventually disposed of (reinjection borehole).

United Nations Economic Commission for Europe (UNECE)
Energy available as heat emitted from within the earth’s crust, usually in the form of hot water or steam. It is exploited at suitable sites:

- for electricity generation using dry steam or high enthalpy brine after flashing

- directly as heat for district heating, agriculture etc.

UNSD Energy Statistics Section
Energy derived from naturally occurring subterranean heat sources.