Greenwich Power Station is a standby oil, gas, and formerly coal-fired power station on the River Thames at Greenwich in south-east London. The station was originally designed by the London County Council architects department, and built in two stages between 1902 and 1910, to provide power for the London Tram Network and London Underground which were being electrified at that time.The station originally had a coal-fired boiler house and an engine room. This housed four compound reciprocating steam engines driving flywheel-type alternators with an output of 6,600 volts and 25 hertz.