Some say that this form of energy is one of the “greenest” alternative energies out there. Studies that say two of the three ways of geothermal energy production is flash-steam and dry-steam give off less than 7% of the green house gasses that fossil fuels give off. The third method, known as a closed binary-cycle system, gives off nearly zero green house gasses.) The most emission heavy part of EGS is when the drills are powered by diesel fuel. Research on EGS Life Cycle Analysis has shown that a good correction for this would be to hook the drill up to the power grid decreasing the already minimal impact GEP power plants has on human health, climate change, and ecosystem quality. Supporters also claim that because geothermal energy systems don’t rely on the changing weather, it is a more reliable energy with a constant energy output.