The buildings of the Port of London Authority and the Central Cold Store, near Smithfield Market, London are a reminder of the city’s industrial and commercial past.
But behind these walls is a hidden power station which may change how the UK heats, cools and powers businesses going forward.

Citigen – owned and run by E.ON since 2002 – has generated electricity since 1993 and captured the byproduct heat, sending it off to buildings in London via a tunnel network.

There is no other combined heat and power plant of such scale in the centre of a UK city.

And now E.ON has finished a 3 year, £26m refurbishment which included replacing two unreliable and dirty ship engines with smaller, cleaner gas versions.