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In deliveryUnited KingdomWorks£3,440,000,000Add to pipeline

Infrastructure Delivery Partnership (IDP)

Awarded to Costain Limited, HOCHTIEF UK, Morgan Sindall Construction and Infrastructure Ltd

Sellafield Limited(buyer)

Published
Published 24 November 2022
Deadline
Closed 10 March 2023

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Overview

Sellafield Limited awarded a £2.945 billion Infrastructure Delivery Partnership (IDP) contract on 9 October 2025 to a consortium of Costain Limited, HOCHTIEF UK, and Morgan Sindall Construction and Infrastructure Ltd. The partnership covers three delivery lots—Electrical Distribution, Utilities, and Civils—with each partner undertaking detailed design, procurement, installation, construction, commissioning, and handover of conventional infrastructure projects over a maximum 180-month term, including an initial 108-month period.

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Lots (4)

  • Lot 1 Strategic Partner

    The scope of the Strategic Partner was:<br/><br/>• Provision of strategic front-end definition<br/>• Portfolio management of programmes, projects and tasks to maximise benefit<br/>• Infrastructure planning (land, utilities, transport, accommodation) to inform and support the Sellafield Ltd Masterplan<br/>• To undertake feasibility studies and initial engineering design, this will require Delivery Partner and Sellafield Ltd subject matter expert input<br/>• To undertake benchmarking and should-cost modelling on costs and schedules<br/>• Production of business cases.<br/>• Provision of input into commissioning strategies and embedding capabilities into business as usual<br/>• To support portfolio planning and optimisation<br/>• To undertake stakeholder engagement<br/>• Sustainability - energy modelling, carbon analysis<br/>• Data management controls, security, governance, retrievals and business continuity<br/>• Drive innovation through the Portfolio<br/>• Knowledge transfer – facilitation, LFE capture, dissemination, obtaining and complying with ISO44001 in the IDP environment<br/>• Gathering, documenting and sharing pre-construction information<br/><br/>Sellafield Ltd made the decision to cancel the Lot 1 procurement in accordance with Sellafield Ltd.'s right to cancel a lot and not to award a contract as provided for at Section 11.9 of the Selection Questionnaire Instructions and also Section 6.6 of the Invitation to Submit Final Tender Instructions.

    £495,000,000
  • Lot 2 Electrical Distribution Delivery Partner

    The Scope of the Electrical Distribution Delivery Partner includes the completion of detailed design and all procurement, installation, construction, commissioning and handover activities that form part of delivery. Typical Electrical Distribution Partner scope will include:<br/>• Refurbishment or replacement of Distribution System Transformers<br/>• Refurbishment or replacement of Electrical substations<br/>• Refurbishment or replacement of Electrical Switchgear<br/>• Replacement of distribution cabling and cable support structures<br/>• Upgrade of site distribution Tele-control system<br/>• Installation of additional standby generation capacity<br/>• Upgrade or refurbishment of existing standby generating capacity<br/>• Upgrade or refurbishment of existing generating capacity<br/>• Installation of additional connection points to the National Grid<br/>• Refurbishment of existing grid connections<br/>• Major repair work to any of the above<br/>• A programme of planned job and tasks<br/><br/>The value stated at V.2.4.2 is the upper value range of the Lot. The value is for the maximum contract term of 180 months, this term consists of an initial term of 108 months.

    £1,290,000,000
  • Lot 3 Utilities Delivery Partner

    The Scope of the Utilities Delivery Partner includes the completion of detailed design and all procurement, installation, construction, commissioning and handover activities that form part of delivery. Typical Utilities Partner scope will include:<br/>• Refurbishment or replacement of the on-site steam distribution system and support structures<br/>• Refurbishment or replacement of the on-site water distribution system and support structures.<br/>• Refurbishment or replacement of the off-site water supply and distribution system including the domestic water treatment plant and storage reservoirs<br/>• Refurbishment of the demineralised water treatment and conditioning plant<br/>• Refurbishment or replacement of the on-site compressed air generation and distribution system including support structures<br/>• Refurbishment or replacement of the on-site bulk chemical storage tanks and associated equipment<br/>• Refurbishment or replacement of the on-site chemical distribution system and support structures<br/>• Improvements to rail and road tanker off-load facility<br/>• Refurbishment or replacement of the sewage treatment plant<br/>• A programme of planned job and tasks<br/><br/>The value stated at V.2.4.2 is the upper value range of the Lot. The value is for the maximum contract term of 180 months, this term consists of an initial term of 108 months.

    £1,060,000,000
  • Lot 4 Civils Delivery Partner

    The Scope of the Civils Delivery Partner includes the completion of detailed design and all procurement, installation, construction, commissioning and handover activities that form part of delivery. Typical Civils Partner scope will include:<br/>• General civils design and engineering<br/>• Road Network including all earthworks slopes and retaining structures<br/>• Rail Network including all earthworks slopes and retaining structures<br/>• Highway, Rail and Pedestrian Bridges<br/>• Service Bridges (pipes, cables and the like)<br/>• Service Trenches<br/>• Service Supports<br/>• Below ground ducts including street works<br/>• Foundations to equipment (electrical equipment, lighting and the like)<br/>• Above ground service supports<br/>• Hard standings for vehicles and mobile plant including car parks<br/>• Hard and soft landscaping<br/>• Retaining walls<br/>• Security Fences, Turnstiles and Gates<br/>• Other minor civils/structural work including utility supports<br/><br/>The value stated at V.2.4.2 is the upper value range of the Lot. The value is for the maximum contract term of 180 months, this term consists of an initial term of 108 months.

    £595,000,000

Key details

Country
United Kingdom
Status
In delivery
Category
Works
Estimated value
£3,440,000,000
Procedure
Selective
Published
24 November 2022
Deadline
Closed
Classification (CPV)
Construction workSite preparation workWorks for complete or part construction and civil engineering workConstruction work for industrial buildingsWaste-treatment plant construction workWaste disposal site construction workBuilding installation workBuilding completion work+30 more

Award outcome

Awarded value
£2,945,000,000
Award date
9 October 2025
Contract period
— → 22 July 2040
Winners
  • Costain Limited
  • HOCHTIEF UK
  • Morgan Sindall Construction and Infrastructure Ltd

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Notice history

Every published notice in this contracting process, newest first.

  1. Contract

    17 October 2025

  2. Tender Update

    17 March 2023

  3. Tender Update

    1 March 2023

  4. Tender Update

    13 February 2023

  5. Contract Notice

    10 February 2023

  6. Prior Information Notice

    24 November 2022

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Costain Limited +2 won Infrastructure Delivery Partnership (IDP)