The company has invested £40 million in the project which will produce power from sewage from 300,000 homes. The new technology will produce electricity for onsite use, cutting Welsh Water’s use of power from the national grid by 45%.
The anaerobic digestion plant is one of the largest of its kind in Europe and forms part of a £75 million investment by Welsh Water in renewable energy sources at its own sites to reduce its carbon footprint. The company is also investing £30 million on a separate AD facility at its Afan Wastewater Works.
Commenting on the new plant, Chairman Robert Ayling said:
"We have invested heavily for more than a decade in wastewater treatment to bring widespread environmental benefits, including vastly improved water quality in our rivers and on the coastline of Wales.
"However, the downside is that the water industry is very energy-intensive, which has been reflected in our £30m annual bill. We will focus on energy efficiency and produce our own sustainable energy where we can.”
Welsh Water has invested a total of £220 million at the Cardiff wastewater treatment works.
With the UK government demanding a 50% reduction in storm overflow spills by 2029, the era of reactive management is over. Speaking in the House of Commons on 21 July 2025, then environment secretary Steve Reed said, “This Government will cut water companies’ sewage pollution in half by the end of the decade.”
ERG, the leading supplier of odour control systems and industrial gas cleaning & thermal systems, has been awarded the coveted King’s Award for Enterprise.
Welsh Water’s new artificial intelligence-driven tool, ORAI, has been shortlisted for three categories at the prestigious British Data Awards 2026 – underscoring the company’s commitment to using cutting-edge technology to deliver better outcome for customers.
Barhale has completed work on two separate Rapid Action Taskforce Spills projects it is carrying out for Severn Trent.
Hear how Scottish Water has completed its £235 million Ayrshire Glasgow Resilience Project - customers across Greater Glasgow, Ayrshire and East Renfrewshire will now benefit from a more secure and resilient water supply.
Hear how United Utilities is accelerating its investment to reduce spills from storm overflows across the Northwest.
Find out more about the remarkable career opportunities on offer at WSP - scroll down to watch the inspirational video.