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Owner's Engineer

GREAT BRITISH ENERGY - NUCLEAR

This public procurement record has 13 releases in its history.

ContractAmendment

07 Aug 2026 at 16:13

UK10 - Contract Change Notice
Award

29 Jun 2026 at 17:20

UK7 - Contract Details Notice
Award

30 Apr 2026 at 13:49

UK7 - Contract Details Notice
Award

09 Feb 2026 at 14:27

UK6 - Contract Award Notice
TenderUpdate

02 Jul 2025 at 10:11

UK4 - Tender Notice
TenderUpdate

17 Jun 2025 at 09:18

UK4 - Tender Notice
TenderUpdate

04 Jun 2025 at 17:06

UK4 - Tender Notice
Tender

03 Jun 2025 at 12:37

UK4 - Tender Notice
Planning

12 May 2025 at 14:11

UK1 - Pipeline Notice
PlanningUpdate

30 Apr 2025 at 09:29

UK3 - Planned Procurement Notice
PlanningUpdate

28 Apr 2025 at 11:25

UK3 - Planned Procurement Notice
Planning

22 Apr 2025 at 15:26

UK3 - Planned Procurement Notice
Planning

22 Apr 2025 at 13:42

UK2 - Preliminary Market Engagement Notice
Summary of the contracting process

Great British Energy – Nuclear procured an Owner’s Engineer service for its UK Small Modular Reactor project. The appointed team provides independent assurance to the Intelligent Customer and Intelligent Client, acting as a client adviser and supplying competent resources for specification, oversight, audit, review and advice on design, scope, budget, risk, delivery and contract compliance. It also provides independent technical and delivery assurance on major design-and-build contracts, including subject-matter expertise and safety consultancy. The work covers engineering, construction-related services, technical testing, analysis and consultancy. Delivery is across the United Kingdom. The buyer is Great British Energy – Nuclear, a central government public authority. The requirement supports deployment of first-of-a-kind nuclear technology and the buyer’s route to a Final Investment Decision.

The procurement is complete and was awarded to Amentum Clean Energy Limited and Cavendish Nuclear Limited as a joint venture. The award was made on 9 February 2026 for £300 million excluding VAT, or £360 million including VAT. The contract was signed on 31 March 2026 and runs from 23 April 2026 to 23 April 2040, with a possible extension to 20 October 2041. The award record gives a contract start of 6 March 2026 and end of 6 March 2040, with maximum extent to 2 September 2041. The procedure was a selective competitive flexible procedure under the Procurement Act 2023. Six valid final-stage bids were received. Evaluation weighted technical quality at 60%, social value at 10% and commercial price at 30%. Economic, financial, technical and programme capabilities, conflicts of interest and conditions of participation were assessed.

This procurement demonstrates substantial, long-term demand for independent engineering assurance supporting a UK nuclear new-build programme. A credible competitor for a future requirement would need demonstrable nuclear, engineering and construction expertise, with the ability to provide technical testing, analysis, safety consultancy and delivery assurance across major design-and-build contracts. It would need experienced personnel and sufficient programme capacity to act as an adviser to an intelligent client, scrutinising design, scope, budget, risk, delivery and contract compliance. The procurement also shows that capability may be assembled through a joint venture, consortium, special purpose vehicle or supply chain. Suppliers should be prepared to evidence economic and financial standing, manage conflicts of interest, maintain an available core team and deliver accepted outputs consistently. Social value delivery, including apprenticeships, placements, internships and staff upskilling, forms part of performance expectations.

How relevant is this notice?

Notice Information

Notice Title

Owner's Engineer

Notice Description

The OE will provide essential independent assurance to the Intelligent Customer and Intelligent Client for the Small Modular Reactor project. This will support the deployment of first-of-a-kind nuclear technology in the UK and facilitate GBE-N's goal of reaching a Final Investment Decision. In particular, the OE will act as a 'client friend' to the Intelligent Customer and Intelligent Client and provide competent resource to undertake specification, oversight, audit, review and advice for decisions relating to design, scope, budget, risk, delivery and contract compliance. It will also play the role of subject matter expert to deliver independent technical and delivery Line of Defence 2 assurance on major design and build contracts. The maximum total contract value is PS300m. However, it is not possible to predict an exact outturn value at this stage due to the length of the contract and inherent uncertainties in scope, which drive variability in the volume of work instructed. In addition, progression through design stages and associated milestones or gates will determine the timing and extent of services required, potentially influencing the overall contract value over time. As envisaged in the tender notice, the duration of the OE contract will depend on matters agreed with the SMR Technology Partner. The current assumption remains that the OE contract will have a 14-year term, but a completion date will be set during the term of the contract in accordance with its terms and to reflect the term of the SMR Technology Partner contract.

Planning Information

GBN has already conducted an early market engagement exercise with suppliers to test GBN's proposed approach against market experience from other large infrastructure projects and use industry knowledge to assist GBN in refining its proposed approach. GBN engaged with suppliers by providing an information pack which outlined GBN's proposed delivery model and gave further context on the role of the OE within this model. The pack stated that from the commencement of the contract, any prospective OE would need to commit to providing the technical and programme capabilities stated in the requirements. Within the information pack provided to suppliers, GBN included a questionnaire for suppliers to complete in order to help GBN refine its proposed approach to the delivery of the OE requirement. Suppliers returned their completed questionnaires electronically to GBN.  The questionnaire covered the role of the OE, GBN's contracting strategy, the number of OEs, alliancing, pricing, incentivisation, contract management, costing, liability and the potential to create joint ventures, consortia and special purpose vehicles, market capacity and conflicts of interest.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-0505a0
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/075438-2026
Current Stage
Award
All Stages
Planning, Tender, Award

Procurement Classification

Notice Type
UK10 - Contract Change Notice
Procurement Type
Standard
Procurement Category
Services
Procurement Method
Selective
Procurement Method Details
Competitive flexible procedure
Tender Suitability
SME
Awardee Scale
Large

Common Procurement Vocabulary (CPV)

CPV Divisions

71 - Architectural, construction, engineering and inspection services

79 - Business services: law, marketing, consulting, recruitment, printing and security

CPV Codes

71300000 - Engineering services

71500000 - Construction-related services

71600000 - Technical testing, analysis and consultancy services

79417000 - Safety consultancy services

Notice Value(s)

Tender Value
£600,000,000 £100M-£1B
Lots Value
£600,000,000 £100M-£1B
Awards Value
£300,000,000 £100M-£1B
Contracts Value
£300,000,000 £100M-£1B

Notice Dates

Publication Date
7 Aug 20262 weeks ago
Submission Deadline
9 Jul 2025Expired
Future Notice Date
2 Jun 2025Expired
Award Date
9 Feb 20266 months ago
Contract Period
31 Mar 2026 - 24 Apr 2040 Over 5 years
Recurrence
Not specified

Notice Status

Tender Status
Complete
Lots Status
Complete
Awards Status
Active
Contracts Status
Active

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
GREAT BRITISH ENERGY - NUCLEAR
Additional Buyers

GREAT BRITISH NUCLEAR

Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
LONDON
Postcode
SW1A 2EG
Postcode Area
South West London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI3 Inner London - West
Small Region (ITL 3)
TLI35 Westminster and City of London
Delivery Location
Not specified
Local Authority
Westminster
Electoral Ward
St James's
Westminster Constituency
Cities of London and Westminster

Supplier Information

Number of Suppliers
2
Supplier Names

AMENTUM CLEAN ENERGY LIMITED

CAVENDISH NUCLEAR LIMITED

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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