Darwin College, Cambridge, is set to embrace renewable energy with an innovative heating system powered by the River Cam. The college has secured planning permission to install a river-sourced heat pump, marking a significant move towards its goal of becoming carbon neutral by 2032.
Approved by Cambridge City Council, the project will see a pump house built on the college’s southern boundary, near the Granta pub. This facility will extract water from the river, harnessing its natural warmth to heat the college buildings before returning the water back to the Cam. The move will eliminate on-site fossil fuel use and reduce carbon emissions, aligning with wider efforts to make Cambridge a greener city.
The plans also include new sustainability features such as swift boxes and bat habitats, ensuring that the development benefits local wildlife as well as the environment.
While councillors praised the heat pump project, discussions also touched on other planned developments, including improved insulation for college buildings—expected to cut energy demand by 70%—and an extension to The Hermitage building.
Dr Mike Rands, Master of Darwin College, described the scheme as a “vitally important” part of a long-term strategy to modernise the college while preserving its historic setting. He highlighted that Darwin is one of the few Cambridge colleges open to visitors free of charge and expressed hope that showcasing renewable energy in action would inspire others.
Some concerns were raised over the design of the new plant room by the river, with councillors debating its height and impact on the landscape. However, officers defended the location, pointing out that placing the heat pump closer to the college buildings would be impractical due to space constraints.
Despite minor reservations about the architectural details, the council voted unanimously in favour of the plans. Cllr Naomi Bennett (Green, Abbey) called the project “one of the most interesting and well-thought-out applications we have seen for a long time,” while Cllr Nadya Lokhmotova (Lib Dem, Trumpington) said she was “very excited” by the idea.
With this green innovation, Darwin College is not only securing a more sustainable future for itself but also setting a precedent for other institutions in Cambridge and beyond.
