Geothermal energy is the heat that comes from the sub-surface of the earth. It is contained in the rocks and fluids beneath the earth’s crust and can be found as far down to the earth’s hot molten rock, magma.
Dry steam is the oldest form
of geothermal technology and takes steam out of the ground and uses it to
directly drive a turbine. Flash plants use high-pressure hot water into cool,
low-pressure water whilst binary plants pass hot water through a secondary
liquid with a lower boiling point, which turns to vapour to drive the turbine.
Where it’s used
Geothermal energy is used in over 20 countries. The United States is the largest producer of geothermal energy in the world, and hosts the largest geothermal field.
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