Energy - geothermal

Geothermal energy
- heat from the earth

Geothermal energy

There are two main types of geothermal energy resources: the low temperature resource within the top three metres of the Earth's surface used as a source for geothermal heat pumps (ground and water source heat pumps), and secondly the high temperature resources obtained from reservoirs of steam and very hot water several kilometres below. High temperature resources are utilised for direct use applications e.g. hot water for district heating and generation of electricity.


General information

  • The International Geothermal Association (IGA)
    Very good site packed with information on geothermal sites around the world and with links to further information.
  • The Geothermal Resources Council
    US on-line library and geothermal links.
  • Geothermal Energy Association
    A trade association composed of U.S. companies who support the expanded use of geothermal energy and are developing geothermal resources worldwide for electrical power generation and direct-heat uses.
  • The Geothermal Education Office (GEO)
    A USA based organisation producing and distributing educational materials about geothermal energy to schools, energy/environmental educators, libraries, industry, and the public. The site has an informative geothermal slide show.

Ground source heat pumps

  • International Ground Source Heat Pump Association
    US based information on geothermal heat pumps.
  • GeoExchange
    Website of the Geothermal Heat Pump Consortium with information on geothermal, ground source heating and cooling systems.
  • Earth Energy Society of Canada
    This site provides background information for residential or commercial owners who are considering the benefits of earth energy.
  • The IEA Heat Pump Centre (HPC)
    An independent international information centre on heat pumps and related technologies. The HPC operates under the umbrella of the International Energy Agency.


  • IEA Heat Pump Centre Newsletter
    Journal on worldwide heat pump developments available in full (pdf) and short (html and email) versions.