The New Statesman
Summary
Unbeknownst to almost all of its 8,000 residents and 480,000 daily visitors, buried beneath London’s Square Mile there sits a hidden power station. The tri-generation Citigen system provides electricity for the grid as well as heating and cooling via a district heating scheme to the historic heart and financial centre of the UK capital, saving an estimated 5,000 tonnes of CO2 a year and aiding in climate action.
Operated by E.ON, heat is generated by two high-efficiency combined heat and power engines, with new technology coming online in the form of three heat pumps and boreholes, extending 200m beneath the city streets, capturing the natural warmth of the earth.
Waste heat is also recovered from engine exhausts, turbochargers, jacket cooling, and lubricating oil and transferred via heat exchangers into the network, increasing efficiency, decarbonising heating requirements and reducing costs. Furthermore, the system has the potential to double its output.
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