 It was commissioned in 1971 as a 2,000-megawatt (MW) power station, with four 500 MW generating units, each consisting of a boiler supplying steam to a turbine that powers an associated generator.The boilers were capable of delivering 1788.0 kg/s of steam at 158.6 bar and 538°C.The cooling pumps were Britain's largest with a flow of 210,000 GPM.