Coal-pulverising unit at a power station. Worker in the pulverising fuel mills area of a coal-fired power station. This is where the coal is ground up into a fine dust before being burnt to generate electricity. This grinding process increases the efficiency of the power station. This is the Drax power station near Selby, North Yorkshire, 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.