Abandoned coal mines could provide sustainable energy in Wales

Wales has allocated £450,000 to the Coal Authority to investigate using the naturally hot water found in flooded coal mines to provide heat for homes.

There is a growing need for new heat sources in Wales, where the heating of homes, businesses and more accounts for approximately 40% of the energy used.

Gas provides much of that energy, but Wales will stop including gas connections in new-build homes in 2025.

Mine water heating is estimated to require 75% fewer carbon emissions than traditional gas methods.

“Improving the energy efficiency of homes is essential as we front up to the climate emergency and build a stronger, greener and fairer Wales,” said climate change minister Julie James.

“To get there, we need to think innovatively and ensure we meet our renewable energy needs of the future, so I’m looking forward to hearing what the Coal Authority discover as part of their work.”

The concept of using naturally warm water to provide heat has already been proven in Wales, albeit on a smaller scale. In Taff’s Well, Rhondda Cynon Taf County Council uses the water from a thermal spring to heat a nearby park pavilion and primary school.

“The Taff’s Well Thermal Spring Project is one we’re very proud of,” said Cllr Tina Leyshon, cabinet member for climate change and corporate services with Rhondda Cynon Taf County Council.

“The project to explore the potential for this technology across the mines network will hopefully play an important part in ensuring the long-term energy security of our communities.”

Similar research is being conducted in Oldham, where the council is in the midst of feasibility works to create the Oldham Mine Water Heat Network. If the network proceeds as envisioned, it would use floodwater from disused mines to generate heat for town centre buildings.

According to an initial feasibility study for the project by engineers Ramboll, the water in the Oldham coal mines could provide 98% of the heat requirements in the town centre.

In the North East, Gateshead Council is looking to commission its own 3MW mine water heat network later this year.