It varies according to the size of the project. A geothermal heating system for your home will pay for itself between 5 and 10 years by reducing energy bills by 30-40%. A geothermal plant at Chena Hot Springs in Alaska has a price tag of $2.2 million and is expected to pay for itself within 4-5 years. Another plant in Canada is expected to pay for itself within 7 years. With these in mind, it seems the range will be 4-10 years for the system to pay for itself.
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