Citigen E.ON

A heat network in the heart of London’s financial district, providing 480,000 daily commuters and the 8,000 residents with affordable, low-carbon energy.


One of the UK’s largest low carbon heating and cooling systems

Below the streets of London’s Square Mile’s sits an underground trigeneration power plant. This low carbon decentralised energy network uses internal combustion engines to heat, power, and cool many of the city’s homes and businesses.

From Smithfield Market to the Barbican Centre, the network’s 10.5 km of pipework supplies heating and cooling to commercial and residential buildings. With an additional 4MW heat pump now installed, it could generate enough renewable energy for 13,600 UK homes and businesses.  This supports the city of London’s environmental objectives and is a great leap in the transition to net zero.

As London continues to grow, E.ON is continually working on new ways to decarbonise energy and provide our capital city with a low carbon energy source, that’s cost effective and efficient.


Working closely with E.ON we see their district energy system as a key part of the solution to our environmental strategy for the City of London

Andrew Crafter
City of London