Coal Natural Gas Oil Nuclear Energy Geothermal Energy Geothermal energy is heat energy that comes from underground.
Geothermal energy is usually in the form of hot water or steam.
In some places, the heat from the Earth's interior is close to the surface. Hot water and steam from underground rise naturally or are brought to the surface. Hot water is used to heat buildings. Steam is used to turn turbines and create electricity. In some places, deposits of steam or hot water lie underground.