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Why do geothermal power plants let out steam?

Question by Kartik P: Why do geothermal power plants let out steam?
geothermal energy plants let out steam through chimneys. But i heard that they put the used steam through a turbine, then into a condenser and back into the ground, to be reused. So why do they let out the steam through the chimneys?

Best answer:

Answer by Irv S
Turbines and heat exchangers are not 100% efficient.
Especially as loads are changing.
Some steam must be vented.

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