The quality of discharged water that has passed through the unified waste water treatment plant is so clean that some plants operate aquafarms. Water has the most important role in the human body and is the largest component of organisms, with the important function of metabolism. Thermal power plants generate electricity with steam power made from water and the quantity of waste water is not large because water and steam are recirculated, such as the circulation of water in our bodies. Unified waste water treatment facilities and desulfurization waste water treatment facilities are sufficiently installed in the plant for cyclone separation, neutralization, coagulation, precipitation, filtration, and adsorption of collected common waste water produced by power-generation. Oily waste water produced in the power generation process and desulfurization waste water is reused or discharged after cleaning, or used in aquafarms by several plants.