The B power station was built with twelve steam boilers: eight coal-fired and four oil-fired. The boilers were rated to deliver 456 kg/s of steam at 62.1 bar and 482°C. There were six 60 MW turbo-alternators giving the station a gross rated output of 363 MW. The new power station began generating in 1955; however, in 1954 the British Electricity Authority was replaced by the Central Electricity Authority (CEA). The CEA itself was abolished in 1957 and both power stations came under the control of the Central Electricity Generating Board (CEGB). The generating capacity, electricity output, load factor and thermal efficiency were as shown in the table.