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In deliveryUnited KingdomServices£600,000,000Add to pipeline

Owner's Engineer

Awarded to AMENTUM CLEAN ENERGY LIMITED, CAVENDISH NUCLEAR LIMITED

GREAT BRITISH ENERGY - NUCLEAR(buyer)

Published
Published 22 April 2025
Deadline
Closed 9 July 2025
See all 26 awarded contractsHow Skim finds tendersView original notice ↗

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Overview

Great British Energy - Nuclear has awarded a contract for Owner's Engineer services to Amentum Clean Energy Limited and Cavendish Nuclear Limited for £600 million. The service provider will deliver independent assurance, technical oversight, and expert advice to support the Small Modular Reactor project's deployment and progression through design stages, with a planned 14-year contract term covering specification, audit, review, and compliance across design, scope, budget, risk, and delivery decisions.

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Key details

Country
United Kingdom
Status
In delivery
Category
Services
Estimated value
£600,000,000
Procedure
Competitive flexible procedure
Rules
Procurement Act 2023
SME suitable
Yes
Published
22 April 2025
Questions by
2 July 2025
Deadline
Closed
Classification (CPV)
Engineering servicesConstruction-related servicesTechnical testing, analysis and consultancy servicesSafety consultancy services

Award outcome

Awarded value
£300,000,000
Award date
9 February 2026
Contract period
26 March 2026 → 27 March 2040
Contract length
14 years
Could run to
20 October 2041
Against estimate
50% below
Bids received
6
Winners
  • AMENTUM CLEAN ENERGY LIMITED
  • CAVENDISH NUCLEAR LIMITED

This contract ends on 27 March 2040, or 20 October 2041 if every extension is used.

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Competition and scoring

Bids received

6

1 from SMEs

Open and restricted tenders in Architectural, construction, engineering and inspection services drew a median of 5 bids over the last 24 months; 18% received only one.

Who bid

  • AMENTUM CLEAN ENERGY LIMITEDWinner
  • AFRY SOLUTIONS UK LIMITED
  • LLOYD'S REGISTER EMEA
  • MOTT MACDONALD LIMITED
  • OVE ARUP & PARTNERS LIMITED
  • TRACTEBEL ENGINEERING (FRANCE)

How bids were scored

Price 30% · Quality 70%

  • Technical Envelope60%
  • Social Value Envelope10%
  • Commercial Envelope30%

Price and cost criteria in black, quality in blue.

Market context

Typical award in Architectural, construction, engineering and inspection services

£100,000

Median of 10,809 awards in the last 24 months

This award is 3000.0× the median.

GREAT BRITISH ENERGY - NUCLEAR in the last 12 months

17

contracts awarded, worth £715,928,947 in total

See their procurement profile →

Recent awards in Architectural, construction, engineering and inspection services

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Notice history

Every published notice in this contracting process, newest first.

  1. Contract Amendment

    7 August 2026

  2. Contract

    29 June 2026

  3. Contract

    30 April 2026

  4. Contract

    9 February 2026

  5. Tender Update

    2 July 2025

  6. Tender Update

    17 June 2025

  7. Tender Update

    4 June 2025

  8. Contract Notice

    3 June 2025

  9. Prior Information Notice

    12 May 2025

  10. Planning Update

    30 April 2025

  11. Planning Update

    28 April 2025

  12. Prior Information Notice

    22 April 2025

  13. Prior Information Notice

    22 April 2025

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