ENERGY SUPPLY SYSTEM AND OPERATION METHOD THEREOF

An energy supply system includes at least two devices selected from a device for generating electric power, a device for heating a heat conveying medium to an atmospheric temperature or higher and a device for cooling a heat conveying medium to the atmospheric temperature or lower; a device for supplying at least two selected from electric power, heat of atmospheric temperature or higher and cold of atmospheric temperature or lower to a plurality of customers; a device for measuring supply quantities of electric power, heat and cold, supplied to the plurality of customers; a device for calculating usage charges for electric power, heat and cold, consumed by each of the customers on the basis of the supply quantities; and a device for settling the usage charges. One enterprise entity manages these activities.