Thames Water Moves Closer to Delivering £840 Million worth of Vital Infrastructure Projects for AMP 8 (2025-2030)

• Thames Water has published its Procurement Specific Questionnaire for suppliers - the next stage in the procurement process for its AMP 8 (2025-2030) major capital projects.  
• 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 Procurement Specific Questionnaire follows a preliminary market engagement process which sought feedback from interested organisations to help Thames Water ensure that the procurement approach is informed, practical and aligned with market capabilities and expectations.
• The company has hosted a Launch Event with prospective bidders to mark the start of the formal procurement phase of this project.

Thames Water is one step closer to delivering £840million worth of major capital projects aimed at enhancing its wastewater and water treatment sites, following the publication of its Procurement Specific Questionnaire (PSQ) for suppliers.

The UK’s largest water and waste water company plans to deliver the 10 projects which form an essential part of its record infrastructure improvement plans over the next five years, with the aim of having signed agreements by March 2026.

The 10 major capital projects span seven wastewater treatment sites and two water treatment sites, and are designed to improve infrastructure resilience, environmental performance, and support population growth across London and the Thames Valley.  

Thames Water is now inviting potential suppliers and contractors to demonstrate, via the PSQ, that they meet the essential criteria to progress to the next stage of procurement for these projects.

As part of its ongoing engagement with the supply chain, Thames Water also welcomed prospective bidders to its Reading offices on 18 September, as part of the formal launch of its procurement process. The event provided an overview of what to expect as part of the procurement process as well as a review of the outcomes of the company’s preliminary market engagement phase. 

Tim Horton, Major Projects and Programmes Director at Thames Water, said: 

“Our purpose is to deliver life's essential service, so our customers, communities and the environment can thrive. We’re embarking on a record £20 billion investment over the next five years to transform our infrastructure, enhance environmental performance, and deliver better services for our customers. 

“Building long-term, collaborative relationships with experienced delivery partners, so we can deliver at pace, is critical to the success of our AMP 8 programme. 

“The launch of our Procurement Specific Questionnaire and recent supplier engagement event mark important milestones in our journey to strengthen our procurement process and ensure we’re ready for the formal bidding phase in November.”

The projects form only one part of Thames Water’s ambitious £20 billion infrastructure investment programme and will include the following sites:

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) 

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 above initial tranche of 10 projects. The bidding process for these projects will start in November 2025. Additional projects will then be added to the framework in AMP8 (2025 to 2030) and AMP9 (2030 to 2035). 

In July 2025, Thames Water published its Major Projects Framework and Preliminary Market Engagement documents, outlining its long-term approach to capital delivery and supplier engagement.