• Geothermal energy stems from Earth's internal heat.
  • Hot springs and geysers are produced by water that is heated by magma or hot rock below the surface.
  • In the United States, California leads all states in producing geothermal energy.
  • The largest plant is in the Geysers Geothermal Resource Area.
  • Geothermal energy is clean and safe.
  • It is renewable.
  • It does not release greenhouse gases.
  • But it is not economical everywhere.
  • Many parts of the world do not have underground sources of heat that are close to the surface for building geothermal power plants.
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