In construction, provision was made on site for a fourth generating unit (to the north of the existing units), including a fourth stack inside the chimney, but the fourth generating unit was cancelled before construction commenced. One design feature of the power station is the lack of steam driven boiler feed pumps, with units 1 and 2 being provided with three 50% electric boiler feed pumps and unit 3 with two 50% electric feed pumps. The main turbo-generator was manufactured by Parsons, and many of the major components were interchangeable with the turbo-generators at Hunterston B around south, on the Firth of Clyde, also then owned by the South of Scotland Electricity Board.