Homes in Seaham are being heated using warm water from the area’s former coal mines, in a scheme designed to cut waste and provide a lower-carbon source of heat.
The new district heat network is already supplying around 50 properties at Seaham Garden Village. It is expected to reach 750 homes as the wider 1,500-home development is built over the next 10 years.
Turning minewater into useful heat
The system uses water from the Dawdon minewater treatment works. Minewater naturally stays between 10C and 20C throughout the year because of deep underground geothermal processes.
The treatment works was originally established to prevent minewater contaminating drinking water for about 30,000 people. Heat that would previously have dissipated into the atmosphere can now be captured and used in nearby homes.
The project brings together Durham County Council, the Mining Remediation Authority, Karbon Homes and Vital Energi. The council is also looking at whether similar networks could work elsewhere in County Durham, alongside existing examples such as those in Gateshead.
Any further schemes would depend on being financially viable, while improvements in the technology could make more sites suitable in the future.
Why it matters for Britain
Seaham shows how former mining infrastructure can support modern housing and make use of an otherwise wasted heat source. If similar projects prove viable, they could help more communities reuse minewater while reducing reliance on conventional heating.
