The 10 MW e GETEM surface plant specific capital cost is not only a function of geofluid (i.e. water) production temperature, but also the second-law "utilization" efficiency. Higher second-law efficiencies generate more electricity, but at a higher specific cost (i.e. cost per kW e generated). At runtime, a GETEM EXCEL macro determines the second-law efficiency needed to minimize the system cost. Thus for this comparison, we use a representative range of second-law efficiencies, from 29% and greater. We use a second-law efficiency of 29% as the minimum because that was the GETEM-optimized efficiency of the Tungsten Mountain power plant, which has a very high resource temperature and shallow well depth (Section 3.1.3). The upper-bound second-law efficiency is determined by GETEM for the same set of conditions as genGEO (Section S5.3). We do not follow the same procedure with GEOPHIRES because GEOPHIRES does not perform any optimizations. (e.g. wellfield, wells, etc.). Also, the reservoir depth is shown that provides the wellhead geofluid temperature given a 35 °C/km temperature gradient and a 15°C surface temperature. The GETEM costs are given both using the genGEO cost minimization strategy and for a surface plant 29% second-law efficiency, which is the GETEM efficiency of the Tungsten Mountain site.