From 1925 it formed an association with three other London companies to centralise electricity generation in the new, high thermal efficiency, power station at Barking.
[1] The Vestry had been granted a Provisional Order by the Board of Trade to supply electricity to the parish of Lambeth in 1892.
[1] The Corporation built a power station in Bengeworth Road Loughborough Junction (51°27'59"N 0°05'48"W)[3] in the Borough of Lambeth together with a high voltage distribution cable network.
[4] In 1923 the plant at Loughborough Junction comprised:[5] These machines had a total generating capacity of 7,350 kW.
Capital expenditure was needed for the purchase of land, buildings, machinery, mains, transformers, meters, electrical instruments, legal costs, fixtures and furniture at the stations.
[4] The overall revenue, expenses and profit for the South London Electric Supply Corporation were as shown.
[13] The companies remained district electricity supply undertakings; although they were physically joined with interconnecting cables.
The companies envisaged that power stations such as Barking would provide enough capacity for their electricity requirements.
Dividends to shareholders were limited to 7 percent per year and the funds that could be carried forward in the accounts were restricted.
[13] The County of London Company built the 118.75 MW Barking A power station which was commissioned in 1925.
[16] The CEB identified high efficiency ‘selected’ power stations that would supply electricity most effectively.