Geothermal energy is heat energy from deep in the earth. Heat is brought to the near-surface by thermal conduction and by intrusion into the earth's crust of molten magma originating from great depth. Ground water is heated to form hydrothermal resources -- naturally occurring hot water and steam. Use of hydrothermal energy is economic today at a number of high-grade sites. Hydrothermal resources are tapped by existing well-drilling and energy-conversion technology to generate electricity or to produce hot water for direct use.
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- International Geothermal Association Information on geothermal energy in use around the world, world conferences on geothermal, and links to related web sites.
- DOE: Geothermal Energy Program Research and development projects of the U.S. Department of Energy (DOE). Includes insights, technical data and publications.
- Geothermal Resources Council Encourages worldwide research and development on geothermal energy resources and utilization. Calendar of events, workshops, membership information, publications, related links and other information.
- New Zealand Geothermal Association Purposes include encouraging research, development and use of geothermal energy in New Zealand.
- Energy Commission Geothermal Program Promotes geothermal energy development in California. Includes fact sheets, documents and data.
- European Geothermal Energy Council (EGEC) Promotes geothermal energy research and development. Includes news, events, details on joining and board of directors.
- NEDO: Geothermal Energy Development Department Department of the New Energy and Industrial Technology Development Organization (NEDO). Includes data about research and development activities.
- Geothermal Energy Research and Application Center This center at the Izmir Institute of Technology undertakes research into the science and technology of geothermal energy and encourages its use in Turkey.
- Wikipedia: Geothermal Power Free encyclopedia article describing the concept of geothermal power. Addresses technical aspects, type of sources, electrical generation and cost.
- Thermal Energy Group - Norwegian University of Science and Technology (NTNU) Focuses on research and education within conversion of natural gas, oil and solid fuels to mechanical work and useful heat.
- US Department of Energy: Geothermal Technologies Program Program focusing on enhanced geothermal systems technology, hydrothermal power and technology validation.