 The stations used them because of a Statutory Order of the Ministry of Supply in November 1947 that all turbo alternators made for the home market could only be of 60 MW at advanced steam conditions.Stella South had a total generating capacity of 300 MW and Stella North originally 240 MW (later recorded as only 224 MW).The stations were the first to use silica removal beds in their turbines, a development which became standard within the CEGB's power stations for some time.