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.
Contract 1. K298 Maple Lodge STW Quality AMP 7 New Permit
Supplier
Contract value
- £280,000,000 including VAT
Above the relevant threshold
Award decision date
17 February 2026
Date assessment summaries were sent to tenderers
17 February 2026
Standstill period
- End: 26 February 2026
- 8 working days
Earliest date the contract will be signed
31 March 2026
Contract dates (estimated)
- 1 April 2026 to 29 March 2030
- 3 years, 11 months, 29 days
Main procurement category
Works
CPV classifications
- 45252127 - Wastewater treatment plant construction work
Contract locations
- UKI - London
Submission
Submission type
Requests to participate
Procedure
Procedure type
Competitive flexible procedure
Special regime
Utilities
Supplier
KIER INFRASTRUCTURE AND OVERSEAS LIMITED
- Companies House: 01157281
- Public Procurement Organisation Number: PVTW-7693-ZMVY
2nd Floor Optimum House
Salford
M50 3XP
United Kingdom
Email: kisproposals@kier.co.uk
Website: http://www.kier.co.uk
Region: UKD34 - Greater Manchester South West
Small or medium-sized enterprise (SME): No
Voluntary, community or social enterprise (VCSE): No
Supported employment provider: No
Public service mutual: No
Contract 1. K298 Maple Lodge STW Quality AMP 7 New Permit
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