Scope
Reference
pqq_89
Description
Great British Nuclear is aiming to procure up to two OEs as part of its Small Modular Reactor (SMR) programme.
The OE will provide essential independent assurance to the Intelligent Customer and Intelligent Client for the relevant SMR project. This will support the deployment of first-of-a-kind nuclear technology in the UK and facilitate GBN's goal of reaching a Final Investment Decision(s) for up to two SMR projects. 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.
Each tenderer will be expected to be able to evidence how it will provide all of the capabilities outlined in the Technical ability section of the questions relating to the conditions of participation.
The total contract value of £600m stated in this notice assumes that GBN will award two OE contracts (one for each planned SMR project), each with a total contract value of up to £300m. The actual value will depend on a number of factors. GBN reserves the right not to proceed with two SMR projects.
The duration of the OE contract(s) is not yet confirmed. This notice envisages a 14-year term, but please note that GBN will set a completion date once the outcome of the SMR Technology Partner procurement is known.
All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.
Total value (estimated)
- £600,000,000 excluding VAT
- £720,000,000 including VAT
Above the relevant threshold
Contract dates (estimated)
- 26 March 2026 to 27 March 2040
- 14 years, 2 days
Main procurement category
Services
CPV classifications
- 71300000 - Engineering services
- 71500000 - Construction-related services
- 71600000 - Technical testing, analysis and consultancy services
- 79417000 - Safety consultancy services
Contract locations
- UK - United Kingdom
Participation
Legal and financial capacity conditions of participation
Please refer to the Procurement Specific Questionnaire for a set of Economic and Financial Standing requirements, and conflicts of interest requirements
All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.
Technical ability conditions of participation
Please refer to the Procurement Specific Questionnaire for a set of technical and programme delivery skills and capabilities.
All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.
Particular suitability
Small and medium-sized enterprises (SME)
Submission
Enquiry deadline
2 July 2025, 5:00pm
Submission type
Tenders
Tender submission deadline
9 July 2025, 5:00pm
Submission address and any special instructions
https://beisgroup.ukp.app.jaggaer.com
The JAGGAER eSourcing Portal may be accessed at https://beisgroup.ukp.app.jaggaer.com/
This is where submissions will be made, all communications between GBN and Tenderers will occur, and is where all official PSQ documentation will be issued.
For further assistance with regards registering on the Jaggaer eSourcing Portal, please consult the available help.
Phone: 08000 698 632
Email: customersupport@jaggaer.com
Tenders may be submitted electronically
Yes
Languages that may be used for submission
English
Award decision date (estimated)
13 March 2026
Award criteria
| Name | Description | Type | Weighting |
|---|---|---|---|
| Technical Envelope | This is PSQ Stage, as such the Award Criteria may be refined at ITT stage. All PSQ questions are Pass Fail. |
Quality | 60% |
| Commercial Envelope | This is PSQ Stage, Award Criteria may be refined at ITT stage. All PSQ questions are Pass Fail. |
Price | 30% |
| Social Value Envelope | This is PSQ Stage, the Award Criteria may be refined at ITT stage. All PSQ questions are Pass Fail. |
Quality | 10% |
Other information
Conflicts assessment prepared/revised
Yes
Procedure
Procedure type
Competitive flexible procedure
Competitive flexible procedure description
The Owner's Engineer (OE) will be procured using the Competitive Flexible Procedure outlined in the Procurement Act 2023 (the Act).
There will be two stages in the OE procurement. In the first stage, tenderers will need to respond to the Procurement Specific Questionnaire (PSQ), which will include conditions of participation. The PSQ will cover topics including, but not limited to, conflicts of interest, economic and financial standing and the tenderer's ability to provide the technical and programme capabilities listed later in this notice. The capabilities set out in the technical ability conditions of participation section below can be delivered in various ways, including (but not limited to) by a tenderer and its supply chain, a joint venture, a special purpose vehicle or a consortium. Please note that while GBN considers this list of capabilities to be comprehensive, it reserves the right to change them (and any other information provided in this notice) by the time of launching the OE procurement.
If the response submitted by a tenderer as part of the first stage of the procurement satisfies all the relevant conditions, the tenderer will be invited to submit a tender as part of the second stage of the procurement. GBN will then assess the tenderer's proposals against questions covering Technical, Commercial and Social Value criteria. Please note that GBN reserves the right to refine its award criteria during the procurement process.
All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.
Documents
Associated tender documents
GBN - OE - PSQ - FAQs.docx
GBN - OE - PSQ - Interim Statement of Requirements.docx
GBN - OE - PSQ - Form.docx
DRAFT GBN - OE - Contract.docx
DRAFT - GBN - OE - ITT Volume 4 - Tender Questions and Criteria.docx
DRAFT - GBN - OE - ITT Volume 2 - Instructions.docx
GBN - OE - PSQ Instructions (1).docx
Contracting authority
GREAT BRITISH NUCLEAR
- Companies House: 05027024
- Public Procurement Organisation Number: PRCJ-2655-YDML
GBN Department For Energy Security and Net Zero
London
SW1A 2EG
United Kingdom
Region: UKI32 - Westminster
Organisation type: Public authority - central government