01 Procurement
Tender overview
- Buyer
- GREAT BRITISH ENERGY - NUCLEAR
- Status
- Complete
- Procurement method
- Competitive flexible procedure
- Category
- services
- CPV classification
- Not supplied
- Tender period
- Not supplied — 9 July 2025
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 £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.
This page represents one OCDS contracting process. Notices can be revised over time. Values may be estimates, award values or contract values and should be read with their displayed stage and date.
02 Awards and contracts
Published award records
Owner's Engineer
- Awarded
- 9 February 2026
- Award value
- £300,000,000
- Suppliers
- 2
- Signed contract
- 30 March 2026
Owner's Engineer
- Awarded
- Not supplied
- Award value
- Not supplied
- Suppliers
- 2
- Signed contract
- 30 March 2026
03 Organisations
Buyers, suppliers and other parties
GREAT BRITISH ENERGY - NUCLEAR
Department For Energy Security and Net Zero, London, UKI32, SW1A 2EG, United Kingdom
Companies House 05027024 →AFRY SOLUTIONS UK LIMITED
920 Birchwood Boulevard, Warrington, UKD61, WA3 7QS, United Kingdom
Companies House 01192469 →AMENTUM CLEAN ENERGY LIMITED
305 Bridgewater Place, Warrington, UKD61, WA3 6XF, United Kingdom
Companies House 01120437 →CAVENDISH NUCLEAR LIMITED
33 Wigmore Street, London, UKI32, W1U 1QX, United Kingdom
Companies House 03975999 →LLOYD'S REGISTER EMEA
71 Fenchurch Street, London, UKI31, EC3M 4BS, United Kingdom
Companies House IP29592R →MOTT MACDONALD LIMITED
10 Fleet Place, London, UKI31, EC4M 7RB, United Kingdom
Companies House 01243967 →OVE ARUP & PARTNERS LIMITED
8 Fitzroy Street, London, UKI31, W1T 4BJ, United Kingdom
Companies House 01312453 →TRACTEBEL ENGINEERING (FRANCE)
7 Rue Emmy Noether, Saint Ouen, FR, 93400, France
Companies House FC036592 →Companies House links appear only for explicit GB-COH identifiers. BritDB does not create company links from a similar name or address.
04 Provenance
Source for this process
Contains public sector information licensed under the Open Government Licence v3.0. Official external links are available only on the source transition page.