A Rankine cycle has at least four components: heat addition (boiler/preheater in Figure ), turbine, heat rejection (cooler/condenser in Figure ), and pump. Heat is transferred from the geofluid to the Rankine cycle where it either is converted to useful work in the turbine or rejected as waste heat. The conversion efficiency of the geothermal heat to electricity (thermal efficiency) is governed by the Carnot efficiency, and tends to be <10% for low-temperature geothermal (Zarrouk and Moon, 2014).