Engineered Geothermal Systems or Enhanced Geothermal Systems (EGS), sometimes referred to as "hot rocks" (hot dry rock, hot fractured rock, HEWI), make use of naturally occurring heat to produce power.
EGSs are located in areas where the heat generated by radiogenic granites over millions of years have been trapped under a thick insulating blanket of sedimentary rock. Sediments such as shale and coal beds have a low thermal conductivity and as a result higher temperatures are achieved where the sediment above the heat source rock is thicker.
EGS resources are typically lower temperature resources and by nature are located deeper than most conventional volcanic geothermal systems.
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