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AWARD Complete

Owner's Engineer

Published 30 Apr 2026
30 Apr 2026


Reference: prj_4553, itt_2242
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 £300m. 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.

Full CPV breakdown

  • 71300000 — Engineering services (primary)

Notice details

Buyer type
Central government
Competition
Restricted / competitive (suppliers are shortlisted first)
Contract type
Services
Winning supplier
Large company
Procurement method
Competitive flexible procedure
Main category
Services
Legal basis
UKPGA 2023/54
Notice status
Complete
Award status
Active
Language
EN
Published
30 Apr 2026 13:49
OCID
ocds-h6vhtk-0505a0
Notice ID
prj_4553, itt_2242

Organisations on this notice

305 Bridgewater Place, Warrington, WA3 6XF, United Kingdom
AC••••• Upgrade to Pro to see
GB-COH 01120437
CAVENDISH NUCLEAR LIMITED
Supplier Large
33 Wigmore Street, London, W1U 1QX, United Kingdom
po••••• Upgrade to Pro to see
GB-COH 03975999

Everything the publisher included in this notice, organised by section. Contact details hidden: upgrade to Pro to see

Organisations

Party 1 › Name GREAT BRITISH ENERGY - NUCLEAR
Party 1 › Address › Street Department For Energy Security and Net Zero
Party 1 › Address › Town / city London
Party 1 › Address › Postcode SW1A 2EG
Party 1 › Address › Country GB
Party 1 › Address › Country United Kingdom
Party 1 › Address › Region (NUTS) UKI32
Party 1 › Role buyer
Party 1 › Classification › Description Public authority - central government
Party 2 › Name AMENTUM CLEAN ENERGY LIMITED
Party 2 › Address › Street 305 Bridgewater Place
Party 2 › Address › Town / city Warrington
Party 2 › Address › Postcode WA3 6XF
Party 2 › Address › Country GB
Party 2 › Address › Country United Kingdom
Party 2 › Address › Region (NUTS) UKD61
Party 2 › Role supplier
Party 2 › Link http://www.amentum.com
Party 2 › Business size large
Party 2 › VCSEs No
Party 2 › Public service mission organisation No
Party 2 › Sheltered workshop No
Party 3 › Name CAVENDISH NUCLEAR LIMITED
Party 3 › Address › Street 33 Wigmore Street
Party 3 › Address › Town / city London
Party 3 › Address › Postcode W1U 1QX
Party 3 › Address › Country GB
Party 3 › Address › Country United Kingdom
Party 3 › Address › Region (NUTS) UKI32
Party 3 › Role supplier
Party 3 › Link https://www.cavendishnuclear.com/
Party 3 › Business size large
Party 3 › VCSEs No
Party 3 › Public service mission organisation No
Party 3 › Sheltered workshop No

Buyer

Name GREAT BRITISH ENERGY - NUCLEAR

Tender

Title Owner's Engineer
Status complete
Procedure type selective
Procedure Competitive flexible procedure
Lot › Status complete
Document › Document type Conflict of interest
Document › Description Not published

Awards

Status active
Category services
Supplier › Supplier 1 › Name AMENTUM CLEAN ENERGY LIMITED
Supplier › Supplier 2 › Name CAVENDISH NUCLEAR LIMITED
Item › CPV › CPV 1 › Description Engineering services
Item › CPV › CPV 2 › Description Construction-related services
Item › CPV › CPV 3 › Description Technical testing, analysis and consultancy services
Item › CPV › CPV 4 › Description Safety consultancy services
Item › Delivery › Region (NUTS) UK
Item › Delivery › Country GB
Item › Delivery › Country United Kingdom

Contracts

Title Owner's Engineer
Status active
Contract period › Start 23 Apr 2026
Contract period › End 23 Apr 2040
Contract period › Can be extended to 20 Oct 2041
Can be renewed Yes
Renewal › Description The duration of the Owner's Engineer contract will be linked to the Completion Date of the Technology Partner contract. Therefore, the extension provision is not linked to a specific date. The intention is that the OE will support the Client to completion of the first fuel cycle.
Value › Value incl. VAT £360,000,000
Value › Value £300,000,000
Value › Currency GBP
Above threshold Yes
Signed 31 Mar 2026
Agreed Metrics › Agreed Metric 1 › Title Social Value
Agreed Metrics › Agreed Metric 1 › Observations › Contract period › Duration In Months 1
Agreed Metrics › Agreed Metric 2 › Title Deliverable Quality
Agreed Metrics › Agreed Metric 2 › Description % of deliverables received by the submission deadline and accepted by the Client (accepted with no significant changes) against the total deliverables with submission deadlines within Measurement Period.
Agreed Metrics › Agreed Metric 2 › Observations › Contract period › Duration In Months 1
Agreed Metrics › Agreed Metric 3 › Title Availability of Core Team
Agreed Metrics › Agreed Metric 3 › Description Availability of Core Team staff (Actual FTE / Baseline FTE).
Agreed Metrics › Agreed Metric 3 › Observations › Contract period › Duration In Months 1
Document › Document type Contract notice
Document › Description Contract details notice on Find a Tender
Document › Link https://www.find-tender.service.gov.uk/Notice/039929-2026
Document › Published 30 Apr 2026
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