Scope
Reference
TC2239
Description
This project includes, but is not limited to the following packages of work:
An additional inlet screen with civils alterations and screening handling upgrade
An additional detritor and flow inlet channel, incorporating a new storm separation weir
A new storm tank and river outfall, including flow transfer culvert and new storm return pumping station
Upgrades to the existing six PSTs and conversion of three storm tanks into PSTs, fitted with chain and flight scraper
Replacement Primary chemical dosing pumps to aid Phosphorus removal
A new activated sludge plant Bank C, with new feed PS and blowers
Eight new 28m diameter final settlement tanks, interconnecting pipework, distribution chambers and RAS system
A new secondary chemical dosing system to aid Phosphorus removal
Two new Tertiary Solids Removal treatment plants, one serving the effluent from Bank A and B, and one serving the effluent from the new Bank C
An additional Drum thickener
New incoming switchboard for the new DNO supply
Modification and upgrade of HV/LV networks
Modification and upgrade to the power management system and site-wide SCADA
Modification and upgrade to the Process SCADA
Additional standby powered generation
Demolition and removal of redundant structures, plant and equipment
N.B. Please note that this Contract Notice shows a value of £280m. The current contract value is circa £140m-£280m.
Total value (estimated)
- £280,000,000 including VAT
Above the relevant threshold
Contract dates (estimated)
- 20 October 2025 to 29 March 2030
- 4 years, 5 months, 10 days
Main procurement category
Works
CPV classifications
- 45252127 - Wastewater treatment plant construction work
Contract locations
- UKI - London
Submission
Enquiry deadline
25 April 2025, 5:00pm
Submission type
Requests to participate
Deadline for requests to participate
6 May 2025, 10:00am
Submission address and any special instructions
You can register your interest to participate here;
https://forms.office.com/e/wVqLQ2QD9b
You will then be issued with access to the project documentation.
Tenders may be submitted electronically
Yes
Languages that may be used for submission
English
Award decision date (estimated)
17 October 2025
Award criteria
| Name | Type | Weighting |
|---|---|---|
| Technical | Quality | 40% |
| Commercial | Price | 40% |
| Behavioral | Quality | 20% |
Other information
Conflicts assessment prepared/revised
Yes
Procedure
Procedure type
Competitive flexible procedure
Special regime
Utilities
Competitive flexible procedure description
The steps that will be followed, including negotiation, refinement of award criteria, and supplier selection for multiple tendering rounds.
• Stage 1: Procurement Specific Questionnaire (PSQ);
Further explanation of PSQ process could be found in PSQ Instruction
• Stage 2: Invitation to Tender (ITN);
Further explanation of ITN process could be found in ITN Instruction
• Stage 3: Evaluation;
Evaluation criteria (Technical 40% Behavioral 20%, Commercial 40%)
Further explanation of evaluation process could be found in ITN Instruction
• Stage 4 Contract Award
Contracting authority
THAMES WATER UTILITIES LIMITED
- Companies House: 02366661
- Public Procurement Organisation Number: PNQQ-4647-DTCV
Clearwater Court
Reading
RG1 8DB
United Kingdom
Region: UKJ11 - Berkshire
Organisation type: Private utility