An ORC has many design decisions which are made that affect both its electricity generation and cost. There are two ways to optimize ORC design in genGEO: a) to maximize electric power generation per unit geofluid produced from a geothermal resource (Section S5.3.1), or b) to minimize the cost per unit of electricity generated (Section S5.3.2). We compare the results of these optimization choices in Section S5.3.3.