We think that Hydro-electric energy is more efficient than Geothermal because it is safer to use. That is because the dam is easier to build then the power plants because the power plant has to have multiple heaters and water reservoirs to get enough steam to power the turbines, while the water dam happens naturally because the water flow goes the little holes in the dam and powers the turbines to get to the generator. Also Geothermal power plants could cause a level 5.1 earthquake.