In genGEO, the specific turbine-generator cost is the GETEM flash turbine-generator cost, with an added coefficient (i.e. 0.67) so the genGEO curve passes through the average NETL coal plant steam turbine cost. It is unclear why GETEM reports two different cost relations for electricity generators: one for the ORC and another for the flash plant. One would expect these generator costs to be independent of working fluid and thus the same for both. We infer that the inconsistency is a result of performing a regression on dissimilar ASPEN-derived datasets. Thus, we adapt the GETEM flash turbine and generator together for use within genGEO. The genGEO turbine-generator cost is given in Equation S28 and is adjusted using the turbine-generator cost index, .