The RPS(Renewables Portfolio Standard) System is aimed at furthering the use of new energy by annually imposing an obligation on electricity retailers to use a certain amount of electricity from new energy (hereinafter referred to as "New Energy Electricity"), according to the amount of their retailing electricity in order to ensure the stability and suitability of energy supply, based on "Special Measures Law Concerning the Use of New Energy by Electric Utilities"(hereinafter referred to as "RPS Law").