Similar to genGEO, GEOPHIRES also uses a single-pressure organic Rankine cycle from ASPEN (Beckers and McCabe, 2019). GETEM uses ASPEN power cycle results of an undocumented type. The genGEO single-pressure model is a simple starting point as systems with multiple pressures, and thus boiling points, are more typically deployed in new developments. The genGEO thermodynamic models may be extended to include these system types.