Amentum Clean Energy Limited

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Previous officers 39

Directors and secretaries as filed at Companies House.

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From Contracts Finder and Find a Tender, the UK Government's public procurement notices, under the Open Government Licence v3.0. Matched to this organisation by company number, charity number or exact name and postcode; every figure links to its source notice.

• DNWP0071/LOT1A/CALDER Ring Fence Buyer: Sellafield Ltd £478,697 2026-09-14 CPV 98391000 Source: Contracts Finder

  DNWP0071/LOT1A/CALDER Ring Fence
• DNWP0040/LOT1A/ HEx-1 Laydown area excavation and pour Buyer: Sellafield Ltd £3,425,940 2026-09-09 CPV 45221210 Source: Contracts Finder

  HEx-1 Laydown area excavation and pour
• DNWP0039/LOT1A/Management Team FY26/27 Buyer: Sellafield Limited £4,084,270 2026-09-08 CPV 71541000 Source: Contracts Finder

  Lot1A Management team
• W2B5 4-point bend: A Buyer: UK Fusion Energy Ltd £33,173 2026-08-04 Source: Find a Tender

  Under lot 4 of the Materials Testing Framework for STEP - VIVS Mechanical Tests. W2B5 4-point bend: A
• Open Framework for Nuclear Technical Services Buyer: United Kingdom National Nuclear Laboratory Value not published 2026-07-29 Source: Find a Tender

  This notice is to commence the start of the standstill period for the establishment of the Open Framework for Nuclear Technical Services. UKNNL is establishing an Open Framework to support with the supply of Nuclear Technical Services for …

  Framework
• GK26-11 - In-active Drying Trials of AGR Slotted Cans (Investigating Impact of Caustic Dosing and Carbon Deposits) Buyer: Nuclear Decommissioning Authority £360,186 2026-07-16 CPV 73000000 Source: Contracts Finder

  GK26-11 - In-active Drying Trials of AGR Slotted Cans (Investigating Impact of Caustic Dosing and Carbon Deposits) - Call off from Spent Fuel and Nuclear Materials - NDA Research Portfolio framework
• DCP Stores Extension - Engineering Support Requirement Buyer: Nuclear Restoration Services Limited £275,263 2026-07-14 CPV 71300000 Source: Contracts Finder

  Procurement of experienced Engineers to support pre-commissioning walk-down activities for the DCP Stores Extension project for 8-10 weeks starting 29th June 2026. The disciplines required are Ventilation, Mechanical and EC&I (Electrical, C…
• Pd Ag Functional Testing Buyer: UK Fusion Energy Ltd £195,000 2026-07-09 Source: Find a Tender

  The STEP Fuel Cycle (FC) system requires advanced technologies for hydrogen separation and recovery. The aim of this investigation is to demonstrate the manufacturability of palladium silver membrane assemblies. This will be achieved throug…
• DNWP0061/LOT1A/CALDER R1 & R2 Filter Room Full Deplant Buyer: Sellafield Ltd £184,647 2026-06-23 CPV 98391000 Source: Contracts Finder

  DNWP0061/LOT1A/CALDER R1 & R2 Filter Room Full Deplant
• CSSF-001 - Support to international post closure criticality safety projects. Buyer: Nuclear Waste Services £20,000 2026-06-03 CPV 73110000 Source: Contracts Finder

  NWS are heavily involved in two international projects on post-closure criticality safety. These are: - Implementing Geological Disposal of radioactive waste Technology Platform (IGD-TP) Post-Closure Criticality Safety (PCCS) project, and …
• Environmental & Conventional Health & Safety Services Buyer: Sellafield Ltd £9,920,000 2026-06-01 CPV 90700000 Source: Contracts Finder

  Environmental & Conventional Health & Safety Services
• CSSF-002 - GDF Criticality Safety Methodology and Assessments Buyer: Nuclear Waste Services £40,000 2026-05-20 CPV 73110000 Source: Contracts Finder

  The scope of Phase 1 includes the delivery of: • Sub-task 1A: Criticality Safety Assessments for 500 litre drums • Sub-task 2A: Criticality Safety Assessments for Pressurised Water Reactor (PWR) Spent Fuel
• Prototype Fast Reactor Concrete Panels Methodology Buyer: NRS Dounreay £93,798 2026-05-19 CPV 71500000 Source: Contracts Finder

  A Contract has been awarded by NRS Dounreay as a result of a mini competition through the Technical and Professional Support Services Framework, for the Repair Optioneering of Concrete Cladding Panels to the PFR Facility Reactor Hall.
• DNWP0053/LOT1A/CALDER F199 Demolition Buyer: Sellafield Ltd £152,895 2026-05-01 CPV 98391000 Source: Contracts Finder

  Demolition of the F199 building.
• Alternative Solutions Bulk Order Further Comp (dummy) Buyer: Nuclear Waste Services £1,300,000 2026-05-01 CPV 90521000 Source: Contracts Finder

  This contract is awarded following a Further Competition conducted under the Expert Support and Alternative Solutions Framework Agreement. This contract will allow for call-off of Alternative Solutions for any Customer with a Waste Services…
• TECHNICAL SUPPORT PROVIDER (TSP): MUNITIONS (DM) GOSPORT - WATERFRONT MUNITIONS HANDLING FACILITY (WMHF) - BEDENHAM PIER Buyer: Defence Infrastructure Organisation £4,500,000 2026-04-23 CPV 71356300 Source: Contracts Finder

  Bedenham Pier Technical Service Provider (TSP) for DM Gosport Waterfront Munitions Handling Facility (WMHF) - Riba stages 3 and 4.
• Expert Support and Alternative Solutions Framework Buyer: Nuclear Waste Services Limited £14,500,000 2026-04-21 CPV 90520000 Source: Contracts Finder

  Nuclear Waste Services (NWS), through its Waste Services line of business, will provide an Expert Support & Alternative Treatment Solutions (ESAS) service to both Nuclear Decommissioning Authority (NDA) and non-NDA customers. The ESAS Frame…
• DNWP0056/LOT1A/ Quaternary Borehole Restoration Buyer: Sellafield £80,736 2026-03-26 CPV 71300000 Source: Contracts Finder

  DNWP0056/LOT1A/ Quaternary Borehole Restoration
• ATO19 D2001 LC15 Peer Review Buyer: Nuclear Restoration Services Limited (Dounreay) £170,967 2026-03-24 CPV 71621000 Source: Contracts Finder

  A contract has been awarded by NRS Dounreay as a result of a mini-competition through the Provision of Safety Case Support and Peer Review Services - Lot 2 Peer Review Services, for the ATO19 D2001 LC15 Peer Review . The OJEU/FTS Contract A…
• DNWP0059/LOT1A/Principal Designer Services Buyer: Sellafield Ltd £499,560 2026-02-17 CPV 71300000 Source: Contracts Finder

  DNWP0059/LOT1A/Principal Designer Services
• GK25-12 Buyer: Nuclear Decommissioning Authority £94,689 2026-01-27 CPV 73000000 Source: Contracts Finder

  Evaluation of Disposal Containers Specifically for the UK's AGR Spent Fuel Inventory
• (06 - EDW&MR) DC25-15 Buyer: Nuclear Decommissioning Authority £283,833 2026-01-26 CPV 73000000 Source: Contracts Finder

  Radiological Testing of Nuclear Standard Elastomer to Ensure Continued
• DNWP Framework Digital Client Lead Buyer: Sellafield Ltd £95,000 2026-01-06 CPV 79410000 Source: Contracts Finder

  The DNWP Framework Digital Client Lead will work as part of the DNWP Framework Central team to ensure that all arrangements are in place to allow the new partners to access the required digital capabilities when needed.
• (05 - SF&NM) GK25-13 Buyer: Nuclear Decommissioning Authority £104,246 2025-12-04 CPV 73000000 Source: Contracts Finder

  The History of Zirconolite and HIP for Plutonium Disposition - Literature Review
• Decommissioning Nuclear Waste Partnership Buyer: Sellafield Limited £4,600,000,000 2025-10-30 CPV 45220000 Source: Contracts Finder

  Sellafield Ltd is responsible for safely operating and decommissioning Europe's largest, most complex nuclear site, which is home to legacy nuclear facilities that are some of the most hazardous buildings in Western Europe. Sellafield Ltd, …
• Post-Closure Safety Case Framework Buyer: Nuclear Waste Services £0 2025-10-21 CPV 79417000 Source: Contracts Finder

  Post-closure safety cases demonstrate the safety of radioactive waste & geological disposal over long timescales & large uncertainties. This framework requires experts in PCSC production, methodology, modelling & knowledge management.
• GK25-15 - Grand Challenges Buyer: Nuclear Decommissioning Authority £89,194 2025-10-17 CPV 73000000 Source: Contracts Finder

  GK25-15 - Grand Challenges
• (04 - SF&NM) GK25-14 Buyer: Nuclear Decommissioning Authority £148,237 2025-10-17 CPV 73000000 Source: Contracts Finder

  Development of Metrology to Detect and Locate Remnant Water in Drying/Dried Spent AGR Fuel
• PFR Raffinate Cement Trials Buyer: NRS Dounreay £85,878 2025-10-17 CPV 71300000 Source: Contracts Finder

  Contract for the PFR Raffinate Immobilisation Trials
• Contracts for Innovation Competition Fusion Industry Challenges: Novel shielding materials and technologies for fusion Buyer: UK Atomic Energy Authority £3,083,562 2025-09-29 CPV 73000000 Source: Contracts Finder

  This is a Contracts for Innovation (previously SBRI) competition funded by the UK Atomic Energy Authority. The aim of the competition is to develop solutions to fusion energy challenges in two key priority areas. The competition has 1 theme…
• Integrated Waste Management Specialist Nuclear Services Framework (IWM24) Buyer: Nuclear Waste Services £26,000,000 2025-09-12 CPV 71313000 Source: Contracts Finder

  Multi-Supplier, Multi-Lot, Framework to provide fast, streamlined access to suitably qualified and experienced specialist capabilities and services to support delivery of all aspects of the Nuclear Waste Service: Integrated Waste Management…
• CBRN Framework Call Off - Incident Planning Operations Sept 2025 Buyer: Defra £20,949 2025-09-01 CPV 80540000 Source: Contracts Finder

  CBRN Framework Call Off - Incident Planning Operations Sept 2025
• (04 - EDWM&R) IG25-11 - Groupwide Areas of Research Interest Buyer: Nuclear Decommissioning Authority £57,554 2025-08-28 CPV 73000000 Source: Contracts Finder

  Groupwide Areas of Research Interest
• Dounreay Cementation Plant Licence Condition Peer Review Buyer: Nuclear Restoration Services Limited (Dounreay) £160,052 2025-07-15 CPV 71356000 Source: Contracts Finder

  A contract has been awarded by NRS Dounreay as a result of a mini-competition through the Peer Review Services Framework, for Dounreay Cementation Plant Licence Condition 15 Peer Review.
• Fully Networked Command, Control and Communications (FNC3) Buyer: MINISTRY OF DEFENCE £533,121 2025-06-13 CPV 72590000 Source: Contracts Finder

  FNC3 seeks for expert support to achieve the outputs formally agreed to by Line of Effort 3 (Data Standards and Exploitation) in the FNC3/JADC2 UK-US Joint Plan (2022-2025) for ensuring US/UK C5I interoperability based around Data Centr…
• CBRN Framework Call Off - Incident Planning Operations May & June 2025 Buyer: Defra £30,791 2025-05-12 CPV 80540000 Source: Contracts Finder

  CBRN Framework Call Off - Incident Planning Operations May & June 2025
• ThermoChimie Phase 4 Framework Buyer: Nuclear Waste Services Limited Value not published Date not published Source: Find a Tender

  The ThermoChimie project (Thermo-Chimie (version applicative 4.4.0)) is a thermodynamic database development project, co-funded by Nuclear Waste Services, NIRAS-ONDRAF, and Andra. A robust, traceable, exhaustive, and dependable thermodynami…

  Framework
• G Cloud 15 Buyer: Government Commercial Agency Value not published Date not published Source: Find a Tender

  G-Cloud 15 (GC15) is the replacement for G-Cloud 14 (GC14), G-Cloud 14 Lot 4 (GC14.4) and Cloud Compute 2 (CC2). It is the largest framework of its kind in the public sector. G-Cloud spend for FY23/24 was £3.1bn and Cloud Compute was £0.5m.…

  Framework
• Technology Services 4 Buyer: Crown Commercial Service Value not published Date not published Source: Find a Tender

  This framework is for the provision of technology and digital consultancy services, transition and SIAM, end user services, infrastructure services, live service management and maintenance, asset management, application development and life…

  Framework
• Construction Professional Services 2 Buyer: Government Commercial Agency Value not published Date not published Source: Find a Tender

  Government Commercial Agency as the Authority has put in place a Pan Government Collaborative Agreement for the provision of Construction Professional Services. To be utilised by Central Government Departments and all other UK Public Secto…

  Framework
• Digital Outcomes and Specialists 7 Buyer: Crown Commercial Service Value not published Date not published Source: Find a Tender

  This framework enables public sector organisations to procure suppliers to deliver digital, data, and technology services in line with government policies, standards, and best practices. The scope for this framework contract supports delive…

  Framework
• Environmental & Conventional Health & Safety Services Buyer: Sellafield Limited Value not published Date not published CPV 90700000 Source: Find a Tender

  Environmental & Conventional Health & Safety Services comprising of six Lots.
• Materials Testing Framework for STEP Buyer: UK Industrial Fusion Solutions Ltd Value not published Date not published Source: Find a Tender

  UKIFS STEP programme seeks to establish a materials testing framework to enable timely and efficient testing of magnet and Vacuum vessel and in-vessel systems (ViVS) materials over the next eight years. The purpose of this procurement is to…

  Framework
• BLC-0201 - Cyber Security Services Framework Buyer: BLUELIGHT COMMERCIAL LIMITED Value not published Date not published Source: Find a Tender

  BlueLight Commercial has established a multi-supplier Open Framework for the provision of Cyber Security Services. The Framework Agreement will be available for use by all UK Police Forces and all other agencies named in the documentation. …

  Framework

About

What it does

Construction of utility projects for electricity and telecommunications; Engineering design activities for industrial process and production; Engineering related scientific and technical consulting activities; Technical testing and analysis

Incorporated

28/06/1973

Registered office

Warrington

Previous names

Jacobs Clean Energy Limited (until 30/09/2024)
Wood Nuclear Limited (until 17/03/2020)
Amec Foster Wheeler Nuclear UK Limited (until 03/09/2018)
Amec Nuclear UK Limited (until 12/12/2014)
Amec NNC Limited (until 03/09/2007)

Ownership

Group

1. Amentum Clean Energy Limited is controlled by Energy, Security and Technology UK Limited
   Evidence

   active 75-100% shares, 75-100% voting, appoints directors · notified 2024-06-12 · source: Companies House PSC register
2. Energy, Security and Technology UK Limited is controlled by CH2M Hill Holdings Limited
   Evidence

   ceased 75-100% shares, 75-100% voting, appoints directors · notified 2024-02-09, ceased 2024-06-06 · source: Companies House PSC register

Ultimately controlled by CH2M Hill Holdings Limited.

Ownership paths are calculated from Companies House persons-with-significant-control filings. Each step shows the filed nature of control and dates; a step marked "ceased" is historical, not current.

360Giving data, published by funders. Coverage only includes funders who publish their grants to 360Giving, so these figures are a floor, not a complete picture.

Top funders

• Department for Business, Energy and Industrial Strategy · £2,117,928 (4 grants)
• Department for Science, Innovation and Technology · £103,001

Most recent

• Department for Science, Innovation and Technology £103,0012023-08-11
• Department for Business, Energy and Industrial Strategy £-7632022-04-01
• Department for Business, Energy and Industrial Strategy £59,7112021-03-01
• Department for Business, Energy and Industrial Strategy £74,9802020-06-01
• Department for Business, Energy and Industrial Strategy £1,984,0002019-04-01

Sources

Official record from Companies House. Governance Register calculates the connections.