Coal supplies for a power station. Bucketwheel machine (centre, in distance) and a coal scraper (yellow, centre left) at a coal-fired power station's stockpile. The bucketwheel machine is used to add and remove coal from the stockpile. The coal scraper moves and compacts the coal to avoid spontaneous combustion. This is the Drax power station near Selby, North Yorkshire, UK. The main chimney (upper left, 259 metres) 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 coal stockpile, see T190/440.