Direct use geothermal resources

Direct use geothermal is usually defined to include resources in the temperature range of approximately 20°C to 150+°C (68 to 302°F). At the lower end of the range the resource generally requires the use of a heat pump for spare or process heating but some applications including aquaculture or fish farming are possible even at these low temperatures. Geothermal resources above 150°C (320°F) are generally used for the generation of electricity, but some high temperature direct use applications including industrial process and dehydration can be economically viable. Increasingly, many of these high temperature, direct use applications are being teamed with moderate temperature (110-150°C, 122-302°F) small-scale electrical generation projects. Direct uses of geothermal include but of course are not limited to aquaculture, greenhouses, space heating and/or cooling (including direct energy systems) agriculture product dehydration and industrial processes.