Flood water from a disused mine is being used as a renewable source of heating for the first time in Wales.
The business near Ammanford, Carmarthenshire, has started pumping water from a nearby mine water treatment site to heat its warehouse.
The Mining Remediation Authority, formerly the Coal Authority, said it continued to help develop similar projects across south and north-east Wales and hoped Wales could be at the "forefront" of the approach, but a similar heat scheme was scrapped by Bridgend council in 2021 due to the concern of rising costs.
The Welsh government said it recognised the "significant role mine water heat can play in our journey to net zero".
About 25 litres of water per second is pumped from the former Lindsay pit every day in order to be cleaned and released into natural waterways.
Flood water which has filled old mines can reach up 20C (68F), depending on the depth.
