AMENTUM CLEAN ENERGY LIMITED
ActiveKey figures
† AMENTUM CLEAN ENERGY LIMITED filed these accounts on paper, so Companies House publishes them only as a scanned image. The figures for the years marked † were read automatically from the scan and kept only where the statements add up (for example net assets equal total equity), but a reading error is still possible — check the original accounts at Companies House.
Ratios
2023/24Sector comparison
SIC 42220Where the company stands among the 3,617 active companies whose first SIC code is 42220 (Construction of utility projects for electricity and telecommunications).
- MONA OFFSHORE WIND LIMITED£1.1bn
- MORVEN OFFSHORE WIND LIMITED£187.7m
- FREEDOM FIBRE LIMITED£177.8m
- DORENELL WINDFARM LIMITED£102.5m
- JOHN LAING INVESTMENTS HOLDING ANDES LIMITED£81.2m
- AMENTUM CLEAN ENERGY LIMITED£80.6m
- BREEZE BIDCO (TNC) LIMITED£77.2m
- NANCLACH LIMITED£75.3m
- TAMAR ENERGY LIMITED£72.2m
- CANADIAN SOLAR UK PROJECTS LTD£64.6m
Positions are approximate. Figures come from each company's latest accounts; money and employee figures are compared only with companies that filed accounts in pounds for a period ending in the last two and a half years and are not dormant, so those groups are smaller than 3,617. The line on each bar marks the median.
Summary: AMENTUM CLEAN ENERGY LIMITED
What kind of company is it?
AMENTUM CLEAN ENERGY LIMITED is a private limited company registered with Companies House under company number 01120437. It was incorporated on 28 Jun 1973. Its status is active. The registered office is in Warrington (WA3). Its nature of business (SIC 2007) is construction of utility projects for electricity and telecommunications (42220), engineering design activities for industrial process and production (71121), engineering related scientific and technical consulting activities (71122), technical testing and analysis (71200).
How is the company doing financially?
The latest accounts in the database are for 2023/24 (period ending 27 Sep 2024); the company files full accounts. Turnover was £554,399,000. Loss for the year was £222,000. Net assets were £80,577,000, up 225.1% on the previous year. Cash at bank and in hand was £50,207,000. The company had an average of 2,519 employees. Figures are available for 2 financial years (2022/23–2023/24).
How does it compare with similar companies?
Compared with 3,617 active companies whose first SIC code is 42220: By turnover it ranks higher than 98% of the 137 that publish turnover (median £1,632,521). By net assets it ranks higher than 99% of them (median £16,276). By total assets it ranks higher than 99% of them (median £68,983). By cash it ranks higher than 99% of them (median £23,818). By number of employees it ranks higher than 99% of them (median 1). It is older than 99% of them (median age 3.7 years).
Does it supply the public sector?
The company is named as a supplier in 263 public contract award notices from 44 public sector buyers since 2015. Contracts awarded to it alone have a combined published value of £949.9m. Its most frequent buyer is RADIOACTIVE WASTE MANAGEMENT LIMITED (119 contracts). 48 of the awards are shared with other suppliers, typically framework agreements. It is recorded as the recipient of 4 central government grants worth £237.7k, mainly from Department for Business, Energy and Industrial Strategy.
What do public registers and reports show?
HMRC lists it as an importer of goods, mainly machinery, electrical equipment, optical, medical and measuring instruments. HMRC lists it as an exporter of goods, mainly machinery, electrical equipment. In its latest payment practices report it took an average of 27 days to pay suppliers, and 18% of invoices were not paid within agreed terms. Its gender pay gap report for 2025/26 shows median hourly pay for women 22.1% lower than for men. It has modern slavery statements on the government registry for 4 years.
Who runs and controls the company?
One person with significant control is registered. 1 of 2 registered charges are outstanding.
When are its next filings due?
The next accounts are due by 30 Sep 2026. The next confirmation statement is due by 24 Apr 2027.
Filed accounts2022/23–2023/24
| 2022/23 † | 2023/24 † | |
|---|---|---|
| Turnover | 303,675,000 | 554,399,000 |
| Profit for the year | 8,772,000 | -222,000 |
| Cash at bank and in hand | 25,194,000 | 50,207,000 |
| Total assets | 118,457,000 | 253,028,000 |
| Total liabilities | — | — |
| Net assets / total equity | 24,787,000 | 80,577,000 |
| Average number of employees | 1,412 | 2,519 |
A dash (—) means no accounts were filed for that year or the item is not in the accounts; 0 is a zero stated in the accounts. Small companies usually file only a balance sheet, so the profit and loss account is often missing.
Public contracts
263 contractsAMENTUM CLEAN ENERGY LIMITED is named as a supplier in 263 public contract award notices from 44 public sector buyers since 2015. The 200 contracts awarded to it alone with a published value add up to £949.9m. 48 awards are shared with other suppliers and not counted in that total.
- RADIOACTIVE WASTE MANAGEMENT LIMITED
- 119 contracts · £19.6m
- United Kingdom Atomic Energy Authority
- 24 contracts · £8.9m
- CTM Portal for the NDA Shared Services Alliance
- 16 contracts · £781.4m
- Sellafield Ltd
- 10 contracts · £84.7m
- Nuclear Decommissioning Authority
- 10 contracts · £1.3m
- DNWP0068/LOT1A/Calder Breakdowns and Maintenance Resource‡Sellafield Ltd · £597,888 · runs until Mar 2027
- Corrosion Testing Framework for STEP‡UK Fusion Energy Ltd · shared by 5 suppliers, up to £6,000,000 in total · 3 lots · runs until Nov 2028
- DNWP0072/LOT1A/ THB Demolition Phases 1-5‡Sellafield Limited · £14,848,365 · runs until Sep 2028
- Waste Characterisation Support on the Dounreay site.‡Nuclear Restoration Services Limited (Dounreay) · shared by 4 suppliers, up to £3,048,000 in total · runs until Aug 2028
- DNWP0071/LOT1A/CALDER Ring Fence‡Sellafield Ltd · £478,697 · runs until May 2027
Show 95 more
- DNWP0040/LOT1A/ HEx-1 Laydown area excavation and pour‡Sellafield Ltd · £3,425,940 · runs until May 2028
- DNWP0039/LOT1A/Management Team FY26/27‡Sellafield Limited · £4,084,270 · runs until Mar 2027
- UVDB Powered by Achilles QUDM for Goods, Works and ServicesAFFINITY WATER LIMITED · shared by 550 suppliers
- W2B5 4-point bend: AUK Fusion Energy Ltd · £33,173 · runs until Nov 2026
- Open Framework for Nuclear Technical ServicesUNITED KINGDOM NATIONAL NUCLEAR LABORATORY LIMITED · shared by 32 suppliers · 10 lots · runs until Aug 2030
- G Cloud 15‡Government Commercial Agency · shared by 2,282 suppliers, up to £14,000,000,000 in total · runs until Aug 2030
- GK26-11 - In-active Drying Trials of AGR Slotted Cans (Investigating Impact of Caustic Dosing and Carbon Deposits)‡Nuclear Decommissioning Authority · £360,186 · runs until Jan 2028
- DCP Stores Extension - Engineering Support Requirement‡Nuclear Restoration Services Limited · shared by 3 suppliers, up to £275,262 in total
- Pd Ag Functional Testing‡UK Fusion Energy Ltd · £195,000 · runs until Mar 2027
- DNWP0061/LOT1A/CALDER R1 & R2 Filter Room Full Deplant‡Sellafield Ltd · £184,647 · runs until Jun 2027
- CSSF-001 - Support to international post closure criticality safety projects.‡Nuclear Waste Services · shared by 2 suppliers, up to £20,000 in total · runs until Mar 2027
- Environmental & Conventional Health & Safety Services‡Sellafield Ltd · shared by 5 suppliers, up to £9,920,000 in total · runs until May 2035
- Environmental & Conventional Health & Safety Services‡Sellafield Limited · £9,000,000 · 2 lots
- CSSF-002 - GDF Criticality Safety Methodology and Assessments‡Nuclear Waste Services · shared by 2 suppliers, up to £40,000 in total
- Prototype Fast Reactor Concrete Panels Methodology‡NRS Dounreay · £93,798 · runs until Dec 2026
- Alternative Solutions Bulk Order Further Comp (dummy)‡Nuclear Waste Services · £1,300,000 · runs until Apr 2027
- DNWP0053/LOT1A/CALDER F199 Demolition‡Sellafield Ltd · £152,895
- BLC-0201 - Cyber Security Services FrameworkBLUELIGHT COMMERCIAL LIMITED · shared by 6 suppliers, up to £16,000,000 in total · 2 lots · runs until May 2034
- TECHNICAL SUPPORT PROVIDER (TSP): MUNITIONS (DM) GOSPORT - WATERFRONT MUNITIONS HANDLING FACILITY (WMHF) - BEDENHAM PIERDefence Infrastructure Organisation · £4,500,000 · runs until Apr 2029
- Expert Support and Alternative Solutions Framework‡Nuclear Waste Services Limited · £14,500,000
- Construction Professional Services 2Government Commercial Agency · shared by 28 suppliers, up to £14,000,000,000 in total · 4 lots · runs until Apr 2030
- DNWP0062/LOT1A/ID - Hazard Reduction‡Sellafield Ltd · £1,735,663 · runs until Mar 2027
- Owner's EngineerGREAT BRITISH ENERGY - NUCLEAR · shared by 2 suppliers, up to £600,000,000 in total · 2 lots · runs until Apr 2040
- CBRN Remediation Services Framework - 2026Department for Environment Food & Rural Affairs · shared by 3 suppliers · runs until Mar 2034
- DNWP0056/LOT1A/ Quaternary Borehole Restoration‡Sellafield · £80,736 · runs until Jun 2027
- ATO19 D2001 LC15 Peer Review‡Nuclear Restoration Services Limited (Dounreay) · £170,967 · runs until Jun 2027
- 959736.70‡Ministry of Defence · shared by 2 suppliers, up to £8,776,588 in total
- ThermoChimie Phase 4 FrameworkNuclear Waste Services Limited · shared by 6 suppliers · 3 lots · runs until Mar 2029
- Radiological Testing of Nuclear Standard Elastomer to Ensure Continued‡Nuclear Decommissioning Authority
- Deterministic Fire Risk Assessment (DFRA) Peer Review‡Nuclear Restoration Services Limited
- DNWP0059/LOT1A/Principal Designer Services‡Sellafield Ltd · £499,560
- UKRI-5155 Radioactive Waste Characterisation and Treatment Services‡UK Research & Innovation (UKRI) · shared by 3 suppliers, up to £2,500,000 in total · runs until Mar 2030
- GK25-12‡Nuclear Decommissioning Authority · £94,689 · runs until Nov 2026
- (06 - EDW&MR) DC25-15‡Nuclear Decommissioning Authority · £283,833 · runs until May 2027
- Digital Outcomes and Specialists 7Crown Commercial Service · shared by 1,624 suppliers, up to £3,240,000,000 in total · runs until Jul 2027
- JDR Management Support Framework.‡UK Atomic Energy Authority · shared by 8 suppliers, up to £8,000,000 in total · runs until Mar 2030
- DNWP Framework Digital Client Lead‡Sellafield Ltd · £95,000
- Transmission Digital Services Framework‡SCOTTISH HYDRO ELECTRIC TRANSMISSION PLC · runs until Feb 2029
- FW Services - Operational Technology Framework‡SCOTTISH HYDRO ELECTRIC TRANSMISSION PLC · runs until Feb 2029
- (05 - SF&NM) GK25-13‡Nuclear Decommissioning Authority · £104,246
- Technology Services 4Crown Commercial Service · shared by 263 suppliers, up to £16,000,000,000 in total · 9 lots · runs until Jun 2028
- Materials Testing Framework for STEPUK Industrial Fusion Solutions Ltd · shared by 3 suppliers, up to £2,333,332 in total · 4 lots · runs until Nov 2027
- Decommissioning Nuclear Waste Partnership‡Sellafield Limited · shared by 4 suppliers, up to £4,600,000,000 in total · runs until Oct 2040
- Decommissioning Nuclear Waste Partnership (DNWP)‡Sellafield Limited · £1,000,000,000
- Post-Closure Safety Case Framework‡Nuclear Waste Services · shared by 5 suppliers · runs until Oct 2029
- Post-Closure Safety Case Framework‡Nuclear Waste Services Limited
- (04 - SF&NM) GK25-14‡Nuclear Decommissioning Authority · £148,237 · runs until Nov 2026
- GK25-15 - Grand Challenges‡Nuclear Decommissioning Authority · £89,194
- PFR Raffinate Cement Trials‡NRS Dounreay · £85,878
- Contracts for Innovation Competition Fusion Industry Challenges: Novel shielding materials and technologies for fusion‡UK Atomic Energy Authority · shared by 11 suppliers, up to £3,083,562 in total
- Integrated Waste Management Specialist Nuclear Services Framework (IWM24)‡Nuclear Waste Services · shared by 8 suppliers, up to £26,000,000 in total · runs until Sep 2029
- Integrated Waste Management Specialist Nuclear Services Framework‡Nuclear Waste Services Limited · 4 lots
- Incident Planning Operations May & June 2025‡DEPARTMENT OF ENVIRONMENT, FOOD AND RURAL AFFAIRS · £30,791
- CBRN Framework Call Off - Incident Planning Operations Sept 2025‡Defra · £20,949
- (04 - EDWM&R) IG25-11 - Groupwide Areas of Research Interest‡Nuclear Decommissioning Authority · £57,554
- BATS Corrosion on Carbon Steel‡Nuclear Waste Services Limited
- Design & Build FrameworkUK Atomic Energy Authority · shared by 12 suppliers, up to £31,666,668 in total · 4 lots
- Dounreay Cementation Plant Licence Condition Peer Review‡Nuclear Restoration Services Limited (Dounreay) · £160,052
- Simulation Software‡UK Atomic Energy Authority · shared by 10 suppliers, up to £360,000 in total
- BATs - Corrosion of Carbon Steel‡Nuclear Waste Services · £260,635
- Design of Steelwork Repairs and Ventilation Replacement‡Nuclear Restoration Services Limited (Dounreay) · £112,297
- Fully Networked Command, Control and Communications (FNC3)‡MINISTRY OF DEFENCE · £533,121
- CBRN Framework Call Off - Incident Planning Operations May & June 2025‡Defra · £30,791
- Embedded Engineering Resource Framework (EERF)‡United Kingdom Atomic Energy Authority · shared by 2 suppliers, up to £9,900,000 in total
- ESC-L2-TO391A, B & C: Level 2 Report Support‡Nuclear Waste Services · shared by 3 suppliers, up to £329,988 in total
- Peer Review Development of Disposal Container Transport Container Sub-Systems‡International Nuclear Services Limited
- Production of Licence Condition 15 Periodic Review‡Nuclear Restoration Services Limited (Dounreay) · £802,365
- Senior Design Engineer Support‡Nuclear Restoration Services Limited (Dounreay) · £839,918 · runs until Feb 2028
- SBRI Competition Fusion Industry Challenges - Novel Concepts for Robust Diagnostics Systems, Sensing and Control‡United Kingdom Atomic Energy Authority · shared by 13 suppliers, up to £3,472,864 in total
- TO386 Assessment of Selective Trench Retrievals‡Nuclear Waste Services · £86,732
- Autonomous Data Collection‡United Kingdom Atomic Energy Authority · £76,500
- TO381 PFLOTRAN Stage 3‡Nuclear Waste Services · £295,356
- GB-Harwell: UKRI-4367 Waste Characterisation Service‡UK Research & Innovation · £89,939
- KBS/0124/T/MCS1/NK The KBS Multi Discipline Subcontractor Framework 2024KBS MARITIME LIMITED · shared by 35 suppliers, up to £60,000,000 in total
- Particle Detector Radiation TestingNATIONAL NUCLEAR LABORATORY LIMITED · £29,801
- Fusion Futures: Uncertainty Quantification for Plasma Control Systems‡United Kingdom Atomic Energy Authority · £149,236
- Sub-Millimetre Laser Profiling System with Embedded Positional Correction for Defect Monitoring in 500L DrumsNATIONAL NUCLEAR LABORATORY LIMITED · £85,332
- Gravity Offload SystemSATELLITE APPLICATIONS CATAPULT LIMITED · £303,000
- Engineering Design Services Framework‡United Kingdom Atomic Energy Authority · £7,500,000 · 5 lots
- Radioactive Substances Regulation - Ad-hoc Monitoring and Technical Support Framework‡Environment Agency · shared by 7 suppliers, up to £1,500,000 in total · runs until Mar 2028
- Radioactive Substances Regulation - Ad-hoc Monitoring and Technical Support Framework‡ENVIRONMENT AGENCY (Defra Network eTendering Portal) · 2 lots
- Waste Characterisation‡United Kingdom Atomic Energy Authority · £87,345
- For Transparency Purposes JSP 375 chapter reviewMinistry of Defence · £95,000
- Safety Case Support and Peer Review Services Framework‡Dounreay Site Restoration Limited (DSRL) · shared by 5 suppliers, up to £8,000,000 in total
- Framework Agreement for the Provision of Safety Case Support and Peer Review Services‡Dounreay Site Restoration Limited
- ACC6036832 - DASA Themed Call: Disruptive Science and Technology Impacting the Future of Defence (Phase 1)Defence Science and Technology Laboratory · £50,000
- FOR TRANSPARENCY PURPOSES ONLY - Provision of DTA Noise Audit‡Ministry of Defence · £126,000
- Provision of DTA Noise Audit‡Ministry of Defence · £126,000
- WP3.5.1 - Development of Datasets for Machine Learning - LongOps‡United Kingdom Atomic Energy Authority · £254,958
- WP3.5.2 Novel Techniques and Technologies for Incorporating Sensor Data into Digital Twins‡United Kingdom Atomic Energy Authority · £239,889
- Trials work to determine suitability of alternative powders for Intermediate Level Waste (ILW) immobilisation‡CTM Portal for the NDA Shared Services Alliance · £61,676
- Update to RSBTC Contents Specification Documents (RWM212-02-006)‡RADIOACTIVE WASTE MANAGEMENT LIMITED · £82,101
- UK SBS - PS21316 - Collector VCS0 leak repair at RAL‡UK SHARED BUSINESS SERVICES LIMITED · £13,900
- RE21689‡UK SHARED BUSINESS SERVICES LIMITED · £13,890
- Waste Characterisation Support‡CTM Portal for the NDA Shared Services Alliance · £327,387
From contract award notices on Contracts Finder (since 2016) and Find a Tender (since 2021), published by the Cabinet Office under the Open Government Licence v3.0. Values are as published by the buyer and usually cover the whole contract term; the total leaves out awards shared between several suppliers, where the published figure is a ceiling for all of them, placeholder values and single figures of £1 billion or more. Notices marked ‡ do not state a company number and were linked by an exact match on the registered name. Contracts below the publication thresholds and those of devolved buyers that publish elsewhere are not included.
Government grants
4 grantsAMENTUM CLEAN ENERGY LIMITED is recorded as the recipient of 4 central government grants since 2020, together worth £237.7k.
- Department for Business, Energy and Industrial Strategy
- 3 grants · £134.7k
- Department for Science, Innovation and Technology
- 1 grant · £103k
- Development of Very Low Head Tidal TurbineDepartment for Science, Innovation and Technology · £103,001 · UKRI - Innovate UK - Scheme
- Low Cost Nuclear Phase 1Department for Business, Energy and Industrial Strategy · −£763 · UKRI - ISCF - Scheme 22/23
- SegwaysteDepartment for Business, Energy and Industrial Strategy · £59,711 · ALB - UKRI - Innovate UK grant awards in 20-21
- Social Distancing for IndustryDepartment for Business, Energy and Industrial Strategy · £74,980 · ALB - UKRI - Innovate UK grant awards in 20-21
From the Government Grants Register published by the Cabinet Office (financial years 2016/17 onwards, Open Government Licence v3.0). It covers grants from central government departments and their agencies where the register states the recipient's company number and the recipient name matches this company; grants from local authorities, lottery distributors and devolved governments are not included.
Statutory reporting
- Average time taken to pay invoices
- 27 days
- Invoices not paid within agreed terms
- 18%
- Standard payment terms
- 7–60 days
- Member of a payment code
- No
- Within 30 days 82%
- 31 to 60 days 13%
- After 60 days 5%
Earlier periods (7)
- Period ending
- Days to pay
- Within 30 days
- Late
- 30 Sep 2024
- 26
- 86%
- 13%
- 31 Mar 2024
- 28
- 87%
- 13%
- 30 Sep 2023
- 27
- 83%
- 34%
- 31 Mar 2023
- 35
- 77%
- 36%
- 30 Sep 2022
- 28
- 78%
- 34%
- 31 Mar 2022
- 37
- 69%
- 45%
- 30 Sep 2021
- 48
- 58%
- 51%
- Median hourly pay
- women 22.1% lower
- Mean hourly pay
- women 17.5% lower
- Median bonus pay
- women 44.4% lower
- Employer size
- 1000 to 4999 employees
Earlier years (8)
- Year
- Median hourly pay
- Mean hourly pay
- 2024/25
- women 21.9% lower
- women 18.8% lower
- 2023/24
- women 18.6% lower
- women 13.5% lower
- 2022/23
- women 22.6% lower
- women 16.5% lower
- 2021/22
- women 24.5% lower
- women 18.8% lower
- 2020/21
- women 21.5% lower
- women 20.4% lower
- 2019/20
- women 15.6% lower
- women 19.1% lower
- 2018/19
- women 25.4% lower
- women 25.8% lower
- 2017/18
- women 31.3% lower
- women 24.8% lower
A positive gap means women's average hourly pay is lower than men's across the whole employer; it is not a comparison of pay for the same work. View on the Gender pay gap service
- 2024
- Statement · summary on GOV.UK · group statement (JACOBS U.K. LIMITED)
- 2023
- Statement · summary on GOV.UK · group statement (JACOBS U.K. LIMITED)
- 2022
- Statement · summary on GOV.UK · group statement (JACOBS U.K. LIMITED)
Earlier years (1)
- 2021
- Statement · summary on GOV.UK · group statement (JACOBS U.K. LIMITED)
Figures the company reported itself to the government's Check payment practices service, Gender pay gap service and Modern slavery statement registry (Open Government Licence v3.0). Only large companies and employers with 250 or more staff have to report, so most companies have nothing here.
Registers and licences
Listed by HMRC as an importer of goods in 9 of the last 12 months on record, most recently August 2026. Main goods: machinery, electrical equipment, optical, medical and measuring instruments, inorganic chemicals and rubber.
Listed by HMRC as an exporter of goods in 2 of the last 12 months on record, most recently July 2026. Main goods: machinery and electrical equipment.
From HMRC's monthly lists of importers and exporters. Traders can ask to be left off the lists, so absence does not mean a company does not trade.
Sources: Charity Commission for England and Wales, Care Quality Commission, Home Office and HM Revenue & Customs, under the Open Government Licence v3.0. Entries marked ‡ come from lists that do not state a company number and were linked by an exact match on the registered name.
History
13 events- Name changed to AMENTUM CLEAN ENERGY LIMITEDPreviously JACOBS CLEAN ENERGY LIMITED
- Financial year 2023/24 endedAccounts: turnover £554.4m, net assets £80.6m, 2,519 employees
- Energy, Security And Technology Uk Limited registered as a person with significant control
- Jacobs U.K. Limited ceased to be a person with significant control
- Financial year 2022/23 endedAccounts: turnover £303.7m, net assets £24.8m, 1,412 employees
- Name changed to JACOBS CLEAN ENERGY LIMITEDPreviously WOOD NUCLEAR LIMITED
- Jacobs U.K. Limited registered as a person with significant control
- Wood Nuclear Holdings Limited ceased to be a person with significant control
Earlier events (5)
- Name changed to WOOD NUCLEAR LIMITEDPreviously AMEC FOSTER WHEELER NUCLEAR UK LIMITED
- Wood Nuclear Holdings Limited registered as a person with significant control
- Name changed to AMEC FOSTER WHEELER NUCLEAR UK LIMITEDPreviously AMEC NUCLEAR UK LIMITED
- Name changed to AMEC NUCLEAR UK LIMITEDPreviously AMEC NNC LIMITED
- Company incorporatedPrivate limited company
Dates as recorded at Companies House: incorporation, name changes, officer appointments and resignations, current and former persons with significant control, and the end of each financial year with figures in the database.