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Main Works Contract for White Horse Reservoir
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Descriptions
From January 2026, the South East Strategic Reservoir Option (SESRO) project name is changing to White Horse Reservoir, with a strapline of 'a space for nature, a place for people.' As our reservoir proposals have evolved, so too has the potential legacy it could have. The proposed reservoir is a critical drought insurance policy for the next century and beyond - but it's also being designed as a place for people to use and enjoy for many years to come. At this exciting stage in development, it's important that we give the project a new identity: one that better reflects the crucial role it will play in shoring up water supply, as well as the broader benefits it will deliver for future generations. It is the same project, with the same vision, but with a new name that will help people recognise it more easily. For us, the name White Horse Reservoir roots this project in local heritage and in the natural world around us. Equally important as the project's new name, the strapline tells us more about where the project's strengths lie; a space for nature, a place for people. To stay up to date and find out more, please visit www.thames-sro.co.uk/whitehorsereservoir Thames Water is leading the development of the new reservoir project, in partnership with Affinity Water and Southern Water. Thames Water is responsible for delivering the development phase, developing the commercial model for the project and for running the procurement processes to appoint the project's Main Works Contractor (MWC) and later, the appointment of an Infrastructure Provider (IP). Thames Water is delivering the project under the Specified Infrastructure Project Regulations, or "SIPR", first established and used for the Thames Tideway Tunnel project. Under this approach a new regulated entity, known as an IP will be established to finance and deliver the project, holding a Project Licence granted by Ofwat. Delivery under SIPR is subject to a notice to specify an infrastructure project, which is currently under development between Thames Water and Ofwat. Following the approach taken on the Thames Tideway Tunnel project, Thames Water is separately procuring the Main Works Contract and the IP Contract. This tender notice relates to the procurement of the Main Works Contract only, which comprises the award of a multi-supplier Framework Agreement and a single Call-Off Contract. The Framework Agreement will be a bespoke framework agreement which is described further in the document associated with this tender notice. The Call-Off Contract will be based on the NEC4 Engineering and Construction Contract June 2017 (with amendments January 2023) using main option C, secondary options including clause X22 (early contractor involvement ("ECI")), and bespoke amendments, which are described further in the documents associated with this tender notice. The Call-Off Contract two-stage ECI approach comprises a design and construction planning stage ("Stage One"); and a detailed design and build stage ("Stage Two"). The two-stage ECI Call-Off Contract includes a key decision point that is based on conditions precedent that must be satisfied before a Notice to Proceed to Stage Two can be issued. The Development Consent Order (DCO) reference design (provided by others) will inform the requirements and constraints within the Call-Off Contract scope (Scope). The MWC will develop the design for construction to comply with the Scope, which will be integrated with the discharge of certain planning requirements "secondary consents" and construction planning for Stage Two. Tenderers will be required to submit a Target Price to deliver the Call-Off Contract requirements included in the tender documents. As part of the Call-Off Contract, the Pricing Information will set out the circumstances where the tendered Target Price can be adjusted during Stage One ("Adjustment Events"), for example, if the Client changes the Scope. Following a Notice to Proceed to Stage Two, the Target Price (established during Stage One) will be subject to amendment in accordance with the compensation events included in the Call-Off Contract. The decision gate to proceed to Stage Two will be dependent on a number of matters, including: 1) appointment of the IP; 2) an accepted design (insofar as it has been developed in Stage One) that meets the requirements of the Call-Off Contract; 3) confirmation of the Target Price in accordance with the Pricing Information; and 4) the granting of the DCO. At the end of Stage One, the Call-Off Contract will be novated to the IP from Thames Water. From the point of novation, the IP will become the MWC's Client and contract counterparty throughout Stage Two, administering the Call-Off Contract and making payments to the MWC accordingly. Subject to the issue of the Notice to Proceed, Stage Two will commence with an initial period to discharge any remaining secondary consenting issues, followed by mobilisation to commence construction. Following construction, a testing and commissioning phase will be required with a target date for the reservoir to be operational from 2040 (although filling the reservoir with water could take several years). Some construction of visitor facilities, as well as landscaping activities will likely continue until 2043. The Call-Off Contract involves the design, build, test and commission of a new reservoir with an operational capacity of 150 million cubic metres (Mm³) and water surface area of circa 6.7km2, situated to the South-West of the town of Abingdon in Oxfordshire, which will support long-term drought resilience across the South East of England. White Horse Reservoir is a proposed fully bunded, non-impounding raw water storage reservoir in the upper catchment of the River Thames. Water will be abstracted from the River Thames during periods when sufficient river water is available and conveyed to the reservoir via a pumping station and circa 4km of tunnels. White Horse Reservoir is being developed in full compliance with the Reservoirs Act 1975. A Construction Engineer and Reservoir Advisory Panel have been appointed to oversee the design and construction, ensuring adherence to safety standards and regulatory requirements throughout the project lifecycle. The Construction Engineer appointment will continue through the entire construction phase, through first filling and the initial years of operation. The Reservoir Advisory Panel will provide regular review of the design and construction activities and draw upon best practice from around the world. The reservoir embankment and associated structures will be designed to national and international standards and guidance documents. To deliver the reservoir, watercourse diversions and replacement floodplain storage are required. A conveyance system will be implemented to transport water to and from the River Thames, and to the interface points with the Thames to Southern Transfer (T2ST) and Farmoor Transfer projects. The reservoir includes passive design provisions for future integration with other strategic water resource and flood alleviation schemes. Other associated infrastructure forms part of the works, including roads, rail sidings, recreational facilities, utilities diversions, renewables and power supplies, and drainage. The scope of the Call-Off Contract will include, but not be limited to: · Design and construction planning. · Mobilisation and enabling works (incl. utility diversions, site clearance and demolition, environmental and archaeological surveys, utility connections, securing the site boundary, habitat creation and species relocation, geotechnical investigations and various other activities). · Creation of a temporary rail siding and materials handling area on the Great Western Main Line, required to facilitate the delivery of certain materials by rail freight and therefore reduce the total volume of material imported and exported by road. · Creation of watercourse diversions, floodplain and drainage, as well as initial works relating to the future restoration of the Wilts and Berks Canal. · Reservoir earthworks, excavation to create the borrow pit and embankments, Replacement Flood Storage, other components of the landscape scheme and road embankments. · Tunnelling and pipelines including the reservoir tunnels and river tunnel. · Road construction (including overbridges). · Concrete works for the operational structures, such as the reservoir towers and pumping station. · River Thames intake/outfall structure, requiring a sheet-piled temporary cofferdam in the River Thames. · Construction of ancillary buildings. · Mechanical and electrical infrastructure and fit-out. · Building construction and fit-out. · Landscaping. · Land and habitat management. Note: The total value (estimated) stated in this Tender Notice is estimated at Q2 2025 prices and therefore excludes any allowance for inflation over the life of the contract from this date.
Timeline
Published Date :
Deadline :
Contract Start :
Contract End :
Tender Regions
CPV Codes
45233120 - Road construction works
71630000 - Technical inspection and testing services
9330000 - Solar energy
71311220 - Highways engineering services
45247100 - Construction work for waterways
45112500 - Earthmoving work
71221000 - Architectural services for buildings
43123000 - Tunnelling machinery
45112450 - Excavation work at archaeological sites
45234100 - Railway construction works
45212423 - Cafeteria construction work
45231400 - Construction work for electricity power lines
45247200 - Construction work for dams and similar fixed structures
45232100 - Ancillary works for water pipelines
45221247 - Tunnelling works
71520000 - Construction supervision services
71311100 - Civil engineering support services
45221240 - Construction work for tunnels
45247120 - Waterways except canals
71312000 - Structural engineering consultancy services
71240000 - Architectural, engineering and planning services
71540000 - Construction management services
45112700 - Landscaping work
45111100 - Demolition work
45231300 - Construction work for water and sewage pipelines
45112400 - Excavating work
45212100 - Construction work of leisure facilities
45246400 - Flood-prevention works
45231110 - Pipelaying construction work
71313000 - Environmental engineering consultancy services
45212600 - Pavilion construction work
90712400 - Natural resources management or conservation strategy planning services
71311230 - Railway engineering services
71510000 - Site-investigation services
45233227 - Slip road construction work
71322400 - Dam-design services
45247110 - Canal construction
71322200 - Pipeline design services
45247210 - Dam construction work
45232153 - Construction work for water towers
45111200 - Site preparation and clearance work
45233226 - Access road construction work
45247211 - Dam wall construction work
45247270 - Reservoir construction works
45232152 - Pumping station construction work
Keywords
TBMs
PV
site archaeology
site excavation
TBM tunnelling
ramp paving
site readiness
solar energy
land grading
track laying
dam civil works
asphalt roadwork
soil digging
rail civil works
terrain design
clean power
mass excavation
rail groundwork
landscaping work
canal excavation
land preparation
railway build
site cleanup
ground clearing
soil shifting
tunnel shafting
bulk excavation
heavy rail works
earth excavation
dam construction
earthmoving work
roadway build
tunnel boring
excavating work
landscape prep
site digs
soil relocation
heritage digs
earth relocation
renewable energy
bulk earthwork
site demolition
site clearance
demolition work
driveway paving
tunnelling works
land contouring
earth removal
land shaping
site leveling
ground moving
trenchers
site landscaping
waterway construction
drainage pipeline works
street construction
compliance auditing
power grid erection
dam face construction
public works support
water basin construction
tower reservoir build
access road paving
load-bearing dam wall
road layout design
water tower construction
testing verification
cross-mountain tunneling
earth-fill dam wall
foundational excavation
concrete dam barrier
reservoir earthworks
geotechnical support
navigable canal works
archaeological trenching
leak detection trench
excavation services
soil mechanics testing
embankment wall build
house design services
demolition of structures
park pavilion build
conformity evaluation
carriageway engineering
terrain behavior study
rail project design
safety inspection
flood-prevention works
vegetation removal
oil pipeline laying
surface preparation
foundation inspection
pipe trench preparation
trainline construction
mechanical pipe laying
retaining dam wall
geotechnical analysis
quality verification
coffee bar structure
dam spillway engineering
vegetation clearing
water passage build
family leisure building
engineering planning
mining tunnellers
safety plan enforcement
landscape grading
milestone tracking
budget reconciliation
project supervision
highway design services
green landscaping
reservoir excavation
industrial demolition
highway ramp build
bedrock profiling
railroad engineering
pipelaying operations
sports venue development
railway consultancy
tunnel boring machines
train track engineering
rail civil engineering
building frame analysis
workflow optimization
rail safety consulting
inland canal build
utility water line build
pumping station build
dam safety planning
hydro dam civil works
terrain reshaping
reservoir wall work
road/rail tunnel work
exit/entry ramp pavement
barrier dam works
embankment dam planning
contractor briefing
geochemical analysis
manual demolition
café architecture
demolition clearance
archaeologist digs
energy corridor build
reservoir barrier build
tunnel lining work
cultural excavation
civil tunnel engineering
irrigation canal build
residential road works
design coordination
buried utility design
floodgate construction
inspection reporting
fluid line laying
stability testing
functional auditing
cost overrun analysis
risk mitigation planning
pipeline support works
subterrain tunnel work
fluvial passage install
structural removal
urban street build
site logistics strategy
façade engineering
tunnel excavation works
heritage unearthing
watercourse canal works
tunnel construction
connector road surfacing
workmanship validation
amusement construction
dam structural design
garden pavilion build
sewage disposal conduit
document control system
performance validation
canal construction
land resource governance
compliance documentation
community leisure hall
nondestructive testing
contractor scheduling
earth landscaping
service line laying
reservoir dam build
contract closure process
temporary pavilion build
water supply tower build
levee system build
river diversion build
controlled demolition
navigation canal build
civil buried structure
historic site excavation
utility pumping hub
sanitary sewer build
self-service dining area
rural road construction
carriageway building
fair pavilion erection
wastewater main laying
event pavilion build
reservoir tower erection
civil tunnelling project
recreational site build
bridge support services
pavement engineering
conduit laying works
overhead cable line work
civil project assistance
artifact recovery
solar power systems
hydraulic channel build
water main bedding
embankment consultancy
intake reservoir build
deliverable verification
ground penetration
rock-boring for tunnels
flood gate installation
non-canal waterway work
building wrecking
dam wall construction
road inspection support
building demolition
transit rail advisory
coffeehouse build
bore construction
tunnel excavation
river flood control
recreation centre build
stratigraphic sampling
planting groundwork
pipeline layout planning
explosive demolition
concrete dam design
play centre construction
slip road surfacing
technical inspection
structural survey
development planning
topsoil stripping
casual café build
trench excavation
site quality enforcement
resource planning
water-retaining structure design
road network installation
institutional architecture
motorway slip lane surfacing
fluvial engineering works
river channel infrastructure
reservoir infrastructure erection
storage reservoir civil works
non-artificial water route build ([turn0search3]
sub-surface structure build
groundwater condition evaluation
pipeline technical drawings
preliminary site diagnostics
architectural structure advisory
built environment consultancy
structural integrity checks
dam project blueprint services
architectural engineering planning
fluid transport systems planning
navigation infrastructure
laboratory soil classification
structural modelling consulting
pumping plant construction
structural design consulting
water containment projects
gas and oil pipeline design
stream restoration civil works
highway infrastructure engineering
technical conformance assurance
rail structural engineering
utility tower installation
water network ancillary works
water storage reservoir build
pipe stringing & placement
fluid transport pipelaying
waterway works except canals
sewage conduit construction
project communication coordination
outdoor pavilion structure
drainage prevention systems
natural water channel engineering
resource sustainability planning
environmental systems design
pressurized tank tower work
entertainment facility works
hydraulic retaining structure works
booster station construction
civil engineering field support
rail corridor construction
canal civil engineering ([turn0search3]
integrated project consultancy
refreshment venue construction
riverbed improvement works
reservoir embankment installation
integrated ecology planning
break-room food venue build
water tank tower installation
reservoir engineering consultancy
sewage infrastructure erection
electric conductor installation
utility water infrastructure preparation
underground excavation machines
pipeline repair trenching
structural retrofitting advice
natural resource management planning
public building architecture
contractor performance review
hydraulic dam build ([turn0search0]
road construction planning
structural integrity evaluation
structural dam wall erection
leisure facility construction
natural stream enhancement
water-lift station installation
pipeline engineering design
subterranean transit work
pavilion building construction
pipe system design services
water retention dam build
water network pipeline work
water pumping facility build
watercourse civil engineering ([turn0search3]
foundation feasibility testing
lightweight pavilion works
ecosystem service mapping
ecological risk assessment
railway infrastructure planning
civil road infrastructure
site operations management
water/gas pipeline installation
earth embankment dam works
reservoir civil works ([turn0search0]
large-scale dam engineering
artificial water channel installation
educational facility design
maintenance access pipeline
water conduit service works
pressure booster installation
interior architectural layouts
steel/concrete frame design
watercourse maintenance builds
cafeteria building erection
snack-service venue build
inland waterways construction
environmental impact consulting
civil works technical assistance
multi-disciplinary planning
structural compliance verification
electric power line installation
permanent water control structure
track system installation
build progress certification
hydraulic structure design
canalised water route construction
service road surface works
road construction engineering
high-voltage line construction
overflow management works
waste management consultancy
pipeline trench installation
water pipeline installation
utility trench pipeline work
construction soil risk evaluation
stakeholder supervision coordination
potable water tower erection
highway systems engineering
concrete dam installation
structural inspection services
underground passage build
pumping infrastructure build
canal lining and earthworks
commercial/residential building design
highway technical services
environmental planning engineering
fixed water structure build
water pump facility erection
underground drive construction
biodiversity conservation strategy
overhead transmission line build
dam reservoir integration
reservoir construction works
rolling stock interface design
flood defence engineering
elevated water storage structure
site civil engineering support
water treatment engineering
recreational pavilion construction
contaminant level surveys
dam structure installation
exhibition pavilion erection
switching system engineering
dam side wall installation
pollution control consulting
elevated storage tank build
pressurised line engineering
pipeline routing consultancy
beverage stop construction
load-bearing structure consultancy
anti-flood infrastructure
groundwater table analysis
resource use optimization
utility line installation
watershed management planning
electrical distribution infrastructure
roadway structural design
archaeological excavation work
power transmission structure
on-site decision-making support
conservation strategy design
green infrastructure consulting
change order administration
seismic structural consulting
healthcare building design
storm surge barrier installation
milestone target planning
borehole pump station work
rail infrastructure works
sustainability engineering
navigable watercourse works
schedule adherence monitoring
interdisciplinary design services
facility planning services
environmental borelogging
leisure infrastructure build
architectural-technical design
dam and fixed hydraulic structure construction
structural architectural plans
piping infrastructure design
habitat restoration planning
ecological engineering advisory
fixed water infrastructure construct
specification compliance checks
building aesthetic design
water pipeline access works
Tender Lot Details & Award Criteria
1 Tender Lots
Workflows
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Suitable for SME :
Nationwide :
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