 The station was progressively expanded, reaching a combined capacity of 42,375 kW following the installation of two extra 10,000 kW British Thomson-Houston generating sets in 1922.In May 1926, The Times reported that the cost of generation per unit of electricity was .25d (approximately £0.001 today), the cost per unit sold being .483d (approximately £0.002).The station had delivered 125,727,060 units of electricity.