A perspective on the future of geothermal energy in the united states

Electricity has been produced from geothermal energy since 1960. Hydrothermal resources, naturally occurring hot water, are the fluid providers. Since these resources seem limited geothermal developers are now looking at the much larger potential resource represented by hot rocks with low productivity. This resource originally termed ldquohot dry rockrdquo (HDR) but now termed ldquoenhanced geothermal systemsrdquo (EGS) which includes the transition between hydrothermal systems and HDR will be the future for geothermal development throughout the world.