The plant began running on 12 January 1882,[3] three years after the invention of the carbon-filament incandescent light bulb. It burnt coal to drive a steam engine which drove a 27-tonne (27-long-ton; 30-short-ton), 125 horsepower (93 kW) generator which produced direct current (DC) at 110 volts.[3]
It initially lit 968 16-candle incandescent lamps to provide street lighting from Holborn Circus to St. Martin's Le Grand, which was later expanded to 3,000 lamps.[4][5] The power station also provided electricity for private residences, which may have included nearby Ely Place.[6] Having run at a significant loss the station closed in September 1886,[4] and the lamps were converted back to gas.[7]
The Holborn Viaduct project was preceded by two months by an electricity supply from a water wheel in Godalming, Surrey – the world's first public electricity supply. This hydroelectric project was on a much smaller scale, however, with a 10 horsepower (7.5 kW) generator running 4 arc lamps and 27 incandescent lamps.[3]
Location and technical specification
Lacking the legal precedent to lay underground cables (digging the street was the sole prerogative of the gas companies),[4] Edison's associate Edward Hibberd Johnson discovered culverts existed on the Holborn Viaduct which would allow for electrical cables to be laid.[3]
The station was on Crown property and so could not be extended, and was running at a significant annual loss.[4] It closed in September 1886 and the lamps were converted back to gas.[7] The building in which it was housed was destroyed by bombing during the Blitz, and the large building called 60 Holborn Viaduct has since subsumed the site.