Although generation of power from geothermal energy with small “wellhead generators” (i.e., units <5MWe) is not new, the past few years have seen an increased interest, application and research into this technology. As a result, there has been a considerable amount of work done on various working fluids including various Freon, organic fluids (e.g., propane, isobutene, etc.), ammonia, and interest and research into low temperature flash is also on the rise