Factories I, II and III each had their own coal-fired power stations for producing high-pressure steam for generating electricity using steam-turbine-alternators; with the resulting low pressure steam used for site heating and cordite drying. The three power-stations were also interlinked by high-pressure steam mains. Each factory had three nitroglycerin hills, operating on a batch process, to produce nitroglycerin. Factories I and II (and possibly III) had their own nitration plants for making nitrocellulose. Nitroglycerin and nitrocellulose were then processed to produce cordite.