Thames Water begins supplier engagement to start delivering £840million worth of vital projects as part of its AMP 8 (2025-2030) investment plans
Two technicians inspect aeration lanes at a sewage treatment works.
- Thames Water intends to invest £840 million in 10 capital delivery projects at seven waste treatment sites and two water treatment sites to improve infrastructure resilience, environmental performance and manage population growth, as part of its 2025-2030 capital delivery investment
- The company is seeking feedback from interested parties to inform its Major Projects Framework, the procurement process for delivering its major capital projects
- Engagement with the market will ensure suppliers are ready to bid for contracts as soon as they are released for competition
Thames Water has taken a major step forward in its ambitious £840 million project to improve nine water and sewage sites as part of its record investment plans over the next five years (2025-2030).
The UK's largest water company has published a PMEN, Preliminary Market Engagement Notice, unveiling the projects to potential contractors with the aim of having signed agreements by March 2026 as the projects form an essential part of its record infrastructure improvement plans over the next five years. Thames Water is nearly doubling its infrastructure investment between 2025 and 2030 as part of its turnaround plan to deliver for customers and the environment.
Water and sewage treatment plants in London, Surrey, Oxfordshire and Hertfordshire will see a range of upgrades to increase their capacity. The projects will improve water quality, reduce pollutions and increase the bioenergy generated. They will include the following:
Waste Water Treatment Sites
- Riverside Sewage Treatment Works
- Beckton Sludge Powered Generators replacement
- Beckton Sewage Treatment Works Water Asset Assurance Programme
- Crossness Sewage Treatment Works
- Didcot Sewage Treatment Works
- Wantage Sewage Treatment Works
- Bicester Sewage Treatment Works
- Hogsmill Sewage Treatment Works
Water Treatment Sites
- Ashford Water Treatment Works Ultraviolet Treatment
- Hampton Water Treatment Works Ultraviolet Treatment
The projects are only one part of Thames Water’s ambitious £20 billion infrastructure investment programme.
Tim Horton, Major Projects and Programmes Director at Thames Water, said: “Our Major Projects Framework underpins our long-term commitment to improving infrastructure resilience, environmental performance, and service to customers as we plan to invest more than £20 billion by 2030.
“We’re preparing to deliver a significant programme of major capital projects as part of our AMP8 and AMP9 investment periods, and we wish to engage with experienced and innovative suppliers who share our ambition to deliver these vital projects.
“By engaging now with the market our aim is to reduce unnecessary bidding effort and to foster long-term, collaborative partnerships with trusted delivery partners.
“This initiative we are unveiling today is in addition to the already established processes we use for our infrastructure investment projects.”
Janine Browne, Commercial & Procurement Director – Interim, said: “The Major Project Framework will accelerate landmark projects and lets us build strong, lasting partnerships with suppliers to unlock deeper collaboration and push boundaries on innovation.”
Thames Water’s supply chain and procurement team is now starting the formal process of engaging interested businesses to refine the commercial approach that will stem from the planned infrastructure programme. Thames Water is seeking feedback on the proposed terms and views on how the Framework can ensure efficient and collaborative working relationships for the company and its appointed contractors.
Subject to governance and procurement procedures, Thames Water aims to enter into framework agreements with selected partners by the end of March 2026, and award the below initial tranche of 10 projects. Additional projects will then be added to the framework in AMP8 (2025 to 2030) and AMP9 (2030 to 2035).
Further details on Thames Water Major Projects Framework and Preliminary Market Engagement documents can be found here.