Geothermal direct use (GDU) is the use of geothermal resources to create valuable commodities from heat, minerals, and gases. The term GDU arises because commercial development of geothermal resources has historically centered on electricity generation, which indirectly uses the resource by converting the energy in its fluids to electricity at geothermal power plants. Direct use of geothermal resources therefore refers to all applications in which...
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