Geothermal Energy: A Glance Back and a Leap Forward (Office of Energy Efficiency & Renewable Energy)
This year marks the centennial of the first commercial electricity production from geothermal resources. A technology centuries in the making, thermal energy generated from the Earth was used for hot baths, greenhouses, and direct heat long before it was harnessed as a power source.
Since the first modest 250-kilowatt geothermal power plant came online near Pisa, Italy in 1913, geothermal electricity production has grown steadily, tapping a reliable, nearly inexhaustible reserve of hydrothermal systems where fluid, heat, and permeability intersect naturally in the subsurface.
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