Electric Power Industry is the industry which change coal, oil, natural gas, nuclear fuel, hydropower, ocean energy, wind energy, solar energy, and biomass energy into electrical energy through power generation facilities, then supply to uses by transmission, transformation, and distribution, together with power generation, transmission, power transformation, power distribution etc. The production process and consumption process of electric energy are carried out at the same time, which cannot be interrupted or stored, and requires unified scheduling and allocation. The electricity industry provides basic power for the industry and other sectors of the national economy. Subsequently, a number of large and medium-sized hydropower stations have been built in suitable area, which is the leading department of the national economy.