Tenders

Main Works Contract for White Horse Reservoir

Open
Deadline
526 days left
August 10, 2027
Contract Details
Category
Other
Reference
005547-2026
Value
£6,840,000,000
Location
Berkshire, Buckinghamshire and Oxfordshire, United Kingdom
Published
February 23, 2026
CPV Code
Project Timeline

Tender Published

January 22, 2026

Deadline for Questions

August 03, 2027

Submission Deadline

August 10, 2027

Contract Start Date

August 10, 2027

Budget
£6,840,000,000
Duration
188 months
Location
Berkshire, Buckinghamshire and Oxfordshire
Type
Other
50
Quality Score/100
Fair

Original Tender Description

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.' 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.

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Requirements & Qualifications

38 requirements across 5 categories

Submission (3)
Mandatory (1)
Compliance (6)
Technical (23)
Financial (5)
SUBMISSION REQUIREMENTS3
--Submission of a Target Price for the Call-Off Contract requirements.
--Submission must adhere to the deadline of 2027-08-11T00:00:00+01:00.
--Participation is restricted to invited candidates, implying a prior selection process.
MANDATORY EXCLUSION GROUNDS1
--No mandatory exclusion grounds are explicitly stated in the provided tender information.
ELIGIBILITY REQUIREMENTS6
--Ability to operate as a Main Works Contractor (MWC) for large-scale infrastructure projects.
--Eligibility to participate in a multi-supplier Framework Agreement.
--Compliance with the Specified Infrastructure Project Regulations (SIPR).
TECHNICAL CAPABILITY REQUIREMENTS23
--Capability to design, build, test, and commission a new reservoir with an operational capacity of 150 million cubic metres (Mm³) and a water surface area of approximately 6.7km².
--Expertise in constructing fully bunded, non-impounding raw water storage reservoirs.
--Ability to design and construct a conveyance system including a pumping station and approximately 4km of tunnels for water abstraction from the River Thames.
FINANCIAL REQUIREMENTS5
--Requirement to submit a Target Price for the Call-Off Contract requirements.
--Acceptance of Target Price adjustment mechanisms during Stage One for "Adjustment Events" (e.g., Client changes to Scope).
--Acceptance of Target Price amendment in accordance with compensation events during Stage Two.

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Documents

5 documents available with AI summaries

Lot L-1HTM
L-1.html

This document is a contract award notice for leadership development services provided to Thirteen Housing Group Limited, detailing the scope, procedure, and supplier of the awarded contract, presented in OCDS format.

OCDS RecordDOC
005547-2026_ocds_record.json

This tender seeks a Main Works Contractor for the White Horse Reservoir project, involving the design, build, test, and commission of a 150 million cubic metre reservoir and associated infrastructure in Oxfordshire, procured via a multi-supplier Framework Agreement and NEC4 ECC Call-Off Contract.

OCDS Release PackageDOC
005547-2026_ocds_release.json

This OCDS Release Package provides structured data detailing the White Horse Reservoir Main Works Contract tender, outlining the project scope, procurement approach, and buyer information.

Official PDF VersionPDF
005547-2026_official.pdf

This tender notice invites bids for the Main Works Contract to design, build, test, and commission the White Horse Reservoir, a 150 million cubic metre new water storage facility in Oxfordshire, under a multi-supplier Framework Agreement and a two-stage NEC4 ECI Call-Off Contract.

Tender NoticeHTM
005547-2026.html

This tender notice details the procurement of a Main Works Contract for the White Horse Reservoir project, outlining a two-stage Early Contractor Involvement (ECI) approach for the design, build, test, and commission of a new 150 million cubic metre reservoir and associated infrastructure in Oxfordshire.

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50
Fair

Tender Quality Score

This tender for the White Horse Reservoir Main Works Contract provides a detailed project description but suffers from critical deficiencies in legal compliance, completeness, and clarity, primarily due to an incorrect CPV code, missing evaluation criteria, and insufficient tender documentation.

Score Breakdown

Legal Compliance60/100

The tender benefits from a clearly defined procedure type and an exceptionally generous submission deadline. However, the assignment of 'Solar energy' (9330000) as the CPV code for a major water infrastructure project is a severe error, fundamentally misrepresenting the tender's nature. Additionally, the absence of explicitly stated mandatory exclusion grounds is a significant legal omission.

Incorrect CPV code assigned (Solar energy for a reservoir project)
Missing explicit mandatory exclusion grounds
Clarity55/100

The project description is highly detailed and the AI-extracted technical requirements are comprehensive and understandable, clearly outlining the scope and two-stage ECI approach. Nevertheless, the complete absence of specified evaluation criteria is a critical flaw, making it impossible for bidders to understand how their proposals will be assessed.

No evaluation criteria specified
Completeness45/100

While basic information like title, reference, organization, value, and duration are present, the tender is critically incomplete regarding essential documentation. The listed documents are insufficient for a project of this scale, notably lacking full tender specifications or contract drafts. Furthermore, one listed document is entirely irrelevant, and mandatory exclusion grounds are missing.

Insufficient and irrelevant tender documents provided (e.g., irrelevant contract award notice, lack of full ITT/specifications)
Missing evaluation criteria
Fairness50/100

The tender benefits from a disclosed value and an exceptionally long submission deadline. However, the lack of specified evaluation criteria severely compromises transparency and objectivity. The absence of an e-submission option can also create barriers to equal access, and the 'Restricted' procedure inherently limits competition.

No evaluation criteria specified, hindering transparency and objectivity
No electronic submission option
Practicality55/100

The tender lacks support for electronic submission, which is a practical drawback in modern procurement. No specific URL for comprehensive tender documents is provided, only a general project website. The contract start date being identical to the submission deadline is also illogical and potentially confusing.

No electronic submission supported
No clear URL for comprehensive tender documents
Data Consistency30/100

Data consistency is a major concern. The CPV code is fundamentally incorrect for the project type. An irrelevant contract award notice for a different organization and service is included in the tender documents. Additionally, the contract start date is illogically set to the submission deadline, and there's a minor discrepancy in submission deadline times.

Incorrect CPV code (Solar energy for a reservoir project)
Inclusion of an irrelevant document (contract award for leadership development)
Sustainability50/100

While the project description incorporates themes of nature, people, and future generations, and technical requirements mention habitat creation, explicit green procurement, social, or innovation criteria for the contractor selection are largely absent. The project is not EU funded.

Lack of explicit green procurement criteria
Lack of explicit social criteria for the contractor

Strengths

Very detailed project description and technical requirements
Exceptionally generous submission deadline (over 1.5 years)
High estimated value disclosed
Clear definition of the procurement procedure
No disputes or suspensions reported

Concerns

Incorrect CPV code (Solar energy for a reservoir project)
Complete absence of evaluation criteria
Insufficient and irrelevant tender documents provided
Missing mandatory exclusion grounds
No electronic submission option

Recommendations

1. Correct the CPV code to accurately reflect the civil engineering and water infrastructure nature of the project.
2. Publish comprehensive tender documents, including detailed specifications, full contract terms, and clear, objective evaluation criteria.
3. Explicitly state mandatory exclusion grounds and consider enabling electronic submission for improved accessibility and efficiency.

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