the plant has two 72 m high tangentially fired, water tube boilers. the boilers have a capacity of 1024 m/hr each, with the output steam being supplied at 167 bar and 540 °c. the boilers are heated by coal. the coal is initially about 300 mm in size. it is crushed to 20 mm and then put into a coal mill, which pulverizes it into extremely fine powder of around 70 microns. the powdered coal is then supplied to the top of the boilers via tubes and primary air (pa) fans, where it is burnt to generate heat and convert the water in the boilers to steam.