Power station buildings. View, from one of the chimneys, of the gypsum storage building (upper centre), at a coal-fired power station. Gypsum (calcium sulphate) is a byproduct of the scrubbers used to clean sulphur dioxide from the coal smoke. This is the Drax power station near Selby, North Yorkshire, UK. This view looks north-west from the main chimney. At 259 metres, it is one of the tallest structures in the UK. As of 2006, Drax is the largest, cleanest and most efficient of the UK's coal-fired power stations. It can burn 36,000 tones of coal a day to produce 4,000 megawatts of power, around 7% of the UK's electricity needs. It was built from 1974-1986. For a view of the chimney, see T190/454. For the inside of the gypsum storage building, see T190/446.