The power plant consists of the machine and boiler house, the flue gas cleaning plant, the flue gas desulphurisation plant and a plant for removing dust. The power plant is cooled using water from the river Mur.
The Mellach district heating power plant is equipped with a cogeneration system: A portion of the steam is taken from the turbine and passed to a heat exchanger, where the steam condenses and gives off its energy. This increases the total amount of energy produced from about 40% to as much as 68%. The power plant is put into operation each year from September to May and supplies up to 225 MW of electricity and 230 MW of district heating. Coal as well as natural gas are used as fuels.