---
title: "Owner's Engineer"
ocid: "ocds-h6vhtk-0505a0"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0505a0"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-0505a0.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-0505a0.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "GREAT BRITISH ENERGY - NUCLEAR"
published: "2026-04-30"
---

# Owner's Engineer

Buyer: GREAT BRITISH ENERGY - NUCLEAR  
Current stage: Award  
OCID: ocds-h6vhtk-0505a0

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## Summary

The procurement process under consideration involves Great British Energy - Nuclear, a central government public authority, as the buying organisation. The contract titled "Owner's Engineer" focuses on the Small Modular Reactor project, aiming to provide essential independent assurance and delivery support for this first-of-a-kind nuclear technology in the UK. The procurement falls within the industry categories of engineering, construction-related services, and technical consultancy. The procurement process employed a selective competitive flexible procedure, culminating in an award on 30th April 2026, with the contract set to run from 23rd April 2026 to 23rd April 2040, potentially extending to 2041. The procurement location is primarily the United Kingdom, with Great British Energy - Nuclear headquartered in London.

This tender presents significant opportunities for business growth, particularly for large corporations specialising in nuclear engineering, construction, and technical consultancy services. With a substantial contract value of up to £300 million, the project entails providing oversight, audit, and advice on design, scope, budget, risk, and delivery matters. The project's focus on deploying advanced nuclear technology and ensuring compliance with high safety standards will appeal to firms with expertise in technical testing, safety consultancy, and those with the capacity to act as independent technical advisors. Companies like Amentum Clean Energy Limited and Cavendish Nuclear Limited, which have been awarded the contract, highlight the calibre and scale of businesses suited for such opportunities.

## Notice

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.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/039929-2026 |
| Notice type | UK7 - Contract Details Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Selective |
| Procurement method details | Competitive flexible procedure |
| Tender suitability | SME |
| Awardee scale | Large |
| All stages | Planning, Tender, Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 30 Apr 2026 |
| Submission deadline | 9 Jul 2025 |
| Future notice date | 2 Jun 2025 |
| Award date | 9 Feb 2026 |
| Contract period | 22 Apr 2026 - 23 Apr 2040 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £600,000,000 |
| Lots value | £600,000,000 |
| Awards value | £300,000,000 |
| Contracts value | £300,000,000 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Complete |
| Awards status | Active |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | GREAT BRITISH ENERGY - NUCLEAR |
| Additional buyers | GREAT BRITISH NUCLEAR |
| Locality | LONDON |
| Post town | South West London |
| Postcode | SW1A 2EG |
| Country | England |
| ITL 1 | TLI London |
| ITL 2 | TLI3 Inner London - West |
| ITL 3 | TLI35 Westminster and City of London |
| Local authority | Westminster |
| Electoral ward | St James's |
| Westminster constituency | Cities of London and Westminster |
| Delivery location | Not specified |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 2 |
| Supplier names | AMENTUM CLEAN ENERGY; CAVENDISH NUCLEAR |

## CPV Codes

### Divisions

- 71 - Architectural, construction, engineering and inspection services
- 79 - Business services: law, marketing, consulting, recruitment, printing and security

### Codes

- 71300000 - Engineering services
- 71500000 - Construction-related services
- 71600000 - Technical testing, analysis and consultancy services
- 79417000 - Safety consultancy services

## Release History

- 30 Apr 2026 at 12:49 - Award - UK7 - Contract Details Notice - https://www.find-tender.service.gov.uk/Notice/039929-2026
- 9 Feb 2026 at 14:27 - Award - UK6 - Contract Award Notice - https://www.find-tender.service.gov.uk/Notice/011436-2026
- 2 Jul 2025 at 09:11 - TenderUpdate - UK4 - Tender Notice - https://www.find-tender.service.gov.uk/Notice/036644-2025
- 17 Jun 2025 at 08:18 - TenderUpdate - UK4 - Tender Notice - https://www.find-tender.service.gov.uk/Notice/032797-2025
- 4 Jun 2025 at 16:06 - TenderUpdate - UK4 - Tender Notice - https://www.find-tender.service.gov.uk/Notice/030038-2025
- 3 Jun 2025 at 11:37 - Tender - UK4 - Tender Notice - https://www.find-tender.service.gov.uk/Notice/029471-2025
- 12 May 2025 at 13:11 - Planning - UK1 - Pipeline Notice - https://www.find-tender.service.gov.uk/Notice/020508-2025
- 30 Apr 2025 at 08:29 - PlanningUpdate - UK3 - Planned Procurement Notice - https://www.find-tender.service.gov.uk/Notice/017813-2025
- 28 Apr 2025 at 10:25 - PlanningUpdate - UK3 - Planned Procurement Notice - https://www.find-tender.service.gov.uk/Notice/017244-2025
- 22 Apr 2025 at 14:26 - Planning - UK3 - Planned Procurement Notice - https://www.find-tender.service.gov.uk/Notice/016291-2025
- 22 Apr 2025 at 12:42 - Planning - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/016232-2025

## Documents

- https://www.find-tender.service.gov.uk/Notice/039929-2026
  30th April 2026 - Contract details notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/011436-2026
  9th February 2026 - Contract award notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/036644-2025
  2nd July 2025 - Tender notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/032797-2025
  17th June 2025 - Tender notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/030038-2025
  4th June 2025 - Tender notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/029471-2025
  3rd June 2025 - Tender notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/020508-2025
  12th May 2025 - Pipeline notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/017813-2025
  30th April 2025 - Planned procurement notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/017244-2025
  28th April 2025 - Planned procurement notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/016291-2025
  22nd April 2025 - Planned procurement notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/016232-2025
  22nd April 2025 - Preliminary market engagement notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-890
  Early Market Engagement Pack
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1852
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1853
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1854
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1855
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1856
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1857
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1859
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-1901
  Updated Draft Contract. The previous version of the contract included an outdated statement of requirements in Schedule 4. This draft contract now reflects the interim statement of requirements that was published alongside this notice.
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-2222
  Tracked Changes version.
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-2223
  Response templates.
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-2655
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-2656
- https://www.find-tender.service.gov.uk/Notice/Attachment/A-2657

## Notice URLs

- http://www.afry.com
- http://www.amentum.com
- http://www.arup.com
- http://www.mottmac.com
- https://beisgroup.ukp.app.jaggaer.com
- https://beisgroup.ukp.app.jaggaer.comTheJAGGAEReSourcingPortalmaybeaccessedathttps://beisgroup.ukp.app.jaggaer.com/Thisiswheresubmissionswillbemade,allcommunicationsbetweenGBNandTendererswilloccur,andiswhereallofficialPSQdocumentationwillbeissued.ForfurtherassistancewithregardsregisteringontheJaggaereSourcingPortal,pleaseconsulttheavailablehelp.Phone:08000698632Email:customersupport@jaggaer.com
- https://beisgroup.ukp.app.jaggaer.com/
- https://tractebel-engie.com/en
- https://www.cavendishnuclear.com/
- https://www.legislation.gov.uk/ukpga/2023/54/contents
- https://www.lr.org/en/

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0505a0. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-0505a0.json.