Construction of a district heating scheme utilising mine water energy is set to begin in spring at development in County Durham.
The Seaham Garden Village development will consist of 750 affordable homes, 750 private homes, a school, shops, and medical and innovation centres.
The scheme is close to existing commercial buildings, a supermarket and the coastal village of Seaham, with a population of around 21,000.
The new development will be supplied with geothermal heat from the Coal Authority’s nearby Dawdon mine water treatment scheme, which treats water abstracted from an extensive network of flooded abandoned coal mines in the area.
Mine heat can be an energy source that is unaffected by external factors, meaning it has a stable price and is not subject to future variations or rises in energy prices.
It is a renewable energy source that also has the potential to have a zero carbon footprint.
The Coal Authority, a government body, is committed to creating a better future from the UK’s mining past, including managing many mine water treatment schemes across Britain. It estimates there could be enough energy in the UK’s flooded, abandoned mines to heat all of the homes on the coalfields.
With one quarter of UK homes and businesses sited on former coalfields, mine water energy could be seen as crucial to when it comes to solving the Britain’s energy crisis, with Seaham Garden Village potentially the first of many similar schemes.
Jeremy Crooks, Head of Innovation at the Coal Authority, said:
Heat from abandoned coal mines is an innovative and practical solution to one of the big challenges facing the economy – decarbonising our heating supplies
There would be wider benefits to this sustainable energy source too, as it would also attract new investment, create employment and deliver lower fuel bills to Seaham Garden Village and to other district heating schemes to be built on the coalfields.
The abandoned coal mines in the UK present an enormous opportunity to us as a source of geothermal energy.
Water in the mines is heated by geological processes, and remains stable year-round. This constantly renewing available, zero-carbon heat resource, can be transferred to a pipe network using a heat exchanger and distributed to nearby homes, and the Seaham Garden Village development will be the first working example of this network.
The scheme – the result of a collaboration between the Coal Authority, Tolent Construction and Durham County Council – is also unusual in that it does not use metal pipes, due to the lower temperatures involved.
The method of delivery is much cheaper than district heating schemes using higher temperatures, where metal piping is essential and has greater temperature losses, making networks such as Seaham Garden Village much more viable than most district heating schemes.