Capital delivery major projects pipeline
Our capital delivery major projects pipeline lists our potential procurement activity. It’s also published on the government Find a Tender service.
This is for information only and reflects our anticipated procurement pipeline without commitment.
|
Project title |
Short description |
Estimated tender release date |
Estimated contract award date |
Estimated construction start date |
Estimated contract duration (award to takeover) |
Estimated contract value (£ ex. VAT) |
Likely procurement procedure |
|---|---|---|---|---|---|---|---|
| K245: Oxford Sewage Treatment Works (STW) |
Increase capacity of STW and improve quality of final effluent (ammonia and phosphorus). Improvements to sludge treatment stream. |
1 Oct 2024 | 1 Jul 2025 | 1 Jul 2026 | 66 months | £240-260m |
UCR ITN to award. Optimising design and programme to fix target cost (two-stage procurement process). |
| K298: Maple Lodge STW |
Increase capacity of STW and storm tanks. Improve quality of final effluent (ammonia and phosphrous). |
1 May 2025 | 1 Feb 2026 | 1 Feb 2027 | 60 months | £180m |
UCR ITN to award. Optimising design and programme to fix target cost (two-stage procurement process). |
| K935: Riverside STW |
New assets to meet discharge compliance. Upgrade and/or replacement of existing expired assets. |
1 Jun 2025 | 1 Feb 2026 | 1 Feb 2027 | 60 months | £120m |
UCR ITN to award. Optimising design and programme to fix target cost (two-stage procurement process). |
| L750: Beckton STW AMP8 WAAP |
Replacement and refurbishment of assets. Improve resilience on process quality compliance and major capital maintenance. |
1 Mar 2026 | 1 Dec 2026 | 1 Jun 2027 | 48 months | £40m |
TBD - most likely two-stage procurement process. |
|
S39830: Beckton STW THP upgrade |
Extra thermal hydrolysis plant and associated assets on the sludge treatment stream. |
1 Mar 2026 | 1 Dec 2026 | 1 Jun 2027 | 60 months | £130m |
TBD - most likely two-stage procurement process. |
|
L752: Mogden STW AMP8 WAAP |
Replacement and refurbishment of assets. Improve resilience on process quality compliance and major capital maintenance. |
1 Mar 2026 | 1 Dec 2026 | 1 Jun 2027 | 54 months | £80m |
TBD - most likely two-stage procurement process. |
| S40439: Didcot STW - Growth, Phosphorus, CHP |
New assets to meet growth, new phosphorus quality compliance and new CHP/Gas to Grid. |
1 Apr 2026 | 1 Jan 2027 | 1 Jan 2028 | 60 months | £110m |
TBD - most likely two-stage procurement process. |
| L479: Hampton Advanced Water Treatment Works (AWTW) UV treatment |
New UV treatment process to deactivate Cryptosporidium Oocysts. |
1 Jul 2026 | 1 Apr 2027 | 1 Oct 2027 | 30 months | £50m | TBD - most likely two-stage procurement process. |
| L844: Ashford UV AWTW UV treatment |
New UV treatment process to deactivate Cryptosporidium Oocysts. |
1 Jul 2026 | 1 Apr 2027 | 1 Oct 2027 | 30 months | £70m |
TBD - most likely two-stage procurement process. |
| S38271: Wantage STW - Growth, phosphorus |
New assets to meet growth and new phosphorus quality compliance. |
1 Jul 2026 | 1 Jan 2027 | 1 Oct 2027 | 42 months | £40m |
TBD - most likely two-stage procurement process. |
| S38971: Reading STW Phosphorus, CHP, WAAP |
Replacement and refurbishment of assets to improve resilience or process compliance. New assets to meet phosphorus quality improvement and CHP/Gas to Grid. |
1 Oct 2026 | 1 Jul 2027 | 1 Apr 2028 | 48 months | £60m |
TBD - most likely two-stage procurement process. |
| S40373: Swindon STW - Sludge growth, phosphorus, pollution |
New infrastructure to meet sludge growth, phosphorus quality permit and pollution reduction. |
1 Oct 2026 | 1 Jul 2027 | 1 Apr 2028 | 54 months | £70m |
TBD - most likely two-stage procurement process. |
| L751: Crossness STW AMP8 WAAP |
Replacement and refurbishment of assets. Improve resilience on process quality compliance and major capital maintenance. |
1 Jan 2027 | 1 Jul 2027 | 1 Feb 2028 | 54 months | £80m |
TBD - most likely two-stage procurement process. |
| S38634: Hogsmill STW - Phosphorus, CHP & WNI river restoration |
New assets to meet phosphorus and river quality improvement and CHP/Gas to Grid. |
1 Apr 2027 | 1 Jan 2028 | 1 Oct 2028 | 42 months | £60m |
TBD - most likely two-stage procurement process. |
You can also download a PDF copy of the procurement pipeline table.
Express an interest
When specific procurements go live, they will be advertised on the Find a Tender service. To express an interest in any of these, please do so using the Find a Tender service. Simply search for "Thames+Water" to see all our current notices.