e.on
Summary
One of the most established examples of this approach in the UK is E.ON’s City of London energy network, anchored on the Citigen energy centre which provides heating, cooling and electricity to buildings across the Square Mile.
Beneath the streets of the City of London is a district energy system operating since the early 1990s. Citigen has been around much longer though, behind its Listed building facades, it started life as a coal-fired power station in 1893, becoming an oil then gas-fired power station, before embarking on its new renewable life today as a the heart of an energy network housing geothermal energy sources and heat pumps.
Located near Smithfield Market, Citigen distributes heat and cooling to buildings through more than 10 kilometres of underground pipework snaking around the City. The geothermal boreholes deep underground run 200m straight down into the London Aquifer - which is as deep as Canary Wharf tower is high! These boreholes take the natural heat of the Earth which can be used in the historic buildings connected to the network such as the Barbican Centre and the Guildhall, new offices like TikTok and Snapchat, as well as residential properties throughout the area.
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