1. The cost of the primary equipment (PEC), , is found. The primary equipment consists of the main equipment in the power cycle. (Equation ) 2. The primary equipment cost is multiplied by the secondary equipment factor to add on the additional cost of secondary equipment (e.g. separators, valves, etc.). The result is the surface plant total equipment cost (TEC), . (Equation S25) 3. The total equipment cost is multiplied by construction factors for labor, materials, sales tax, and equipment freight. The result is the surface plant bare erected cost (BEC), . (Equation ) 4. The bare erected cost is multiplied by factors to account for indirect cost, process contingency, and project contingency. The result is the total plant cost (TPC) of the surface plant, . (Equation ) Similar to GETEM, the primary equipment cost (PEC), , in genGEO is the sum of the major equipment, given in Equation S24. In the case of an ORC, these are: turbine, pump, geofluid heat exchanger, and cooling tower. Note: The major equipment parts will vary by cycle design. For example, a binary system might have two pumps: an ORC circulation pump and a lineshaft production pump. Similarly, a CPG system may only have a turbine generator and cooling tower. Equation S24 should be adapted as needed for the specific power cycle for which costs are being estimated.