There are two surface plant types implemented in genGEO: 1) an ORC that uses water as the subsurface heat extraction fluid and 2) a power cycle that directly uses geologically stored CO 2 to generate electricity (i.e. a CPG power plant). These power cycles are modeled following the method used in Ref. 19, except that tower parasitic load fractions have been re-regressed for a better fit of the raw data.