Top 100 Cleantech Companies in the UK | 2026

Lily Ruaah,
 21 May 2026

UK cleantech companies raised £2.95b across 535 deals in 2025 — the sector’s second-strongest year on record, behind only the 2023 peak of £3.44b across 619 deals. The first quarter of 2026 has already delivered £571m across 173 deals, putting the sector on pace for another year above £2b. Across all time, UK cleantech companies have raised £18.7b in equity funding tracked by Beauhurst, with 76% of that total arriving since the start of 2020.

We’ve ranked the top 100 cleantech companies by total equity raised (all data sourced from the Beauhurst platform).

An overview of the cleantech sector

Cleantech covers companies building technology and services that reduce environmental impact, including renewable energy generation, energy storage, electric vehicle infrastructure, hydrogen production, carbon capture and removal, sustainable materials and packaging, circular-economy and recycling technologies, sustainable mobility, climate data and analytics, and energy-efficient computing.

Beauhurst tracks 12,218 active cleantech companies in the UK, up from 4,957 in the final quarter of 2015 — a 147% increase over the decade. Together, these companies generated £620b in turnover according to latest financials and support an estimated 583,373 employees across the UK.

Across all time, cleantech companies have raised £18.7b in equity funding tracked on the platform, making this the largest sector we’ve covered by total capital deployed. The 2023 peak of £3.44b has been followed by two further years above £2.3b, with 2026 already on a comparable trajectory.

Key findings

  • Centrica tops the ranking with £1.13b raised. The South East-based energy utility — which generates, stores, and supplies energy including renewables — accounts for 6.0% of all UK cleantech equity raised to date and 11% of the top 100 alone.
  • GRIDSERVE (£623m, South West) in solar storage and EV charging takes second, followed by ITM Power (£521m, Yorkshire and The Humber) in hydrogen, Highview Power (£507m, London) in long-duration energy storage, and OVO Group (£459m, South West). The top five account for 17% of all UK cleantech equity — the most dispersed top-five distribution in the series.
  • London hosts 36 of the top 100, followed by the South East (21), East of England (13), and South West (eight). The top 100 spans 14 UK regions including all four nations, with Scotland represented by Aberdeen, Tayside, Highlands and Islands, and the East and West of Scotland. The East of England’s 13 entries reflect a strong Cambridge deep-tech cluster spanning batteries, materials, and AI for climate.
  • Growth-stage businesses dominate the top 100 with 52 entries, followed by established (23), venture-stage (19), exited (four), and seed (two). The 27 mature names sit alongside 71 still-scaling growth and venture businesses — the highest growth-stage concentration we’ve seen in any sector, reflecting the capital-intensive nature of cleantech and the steady flow of late-stage rounds underwriting infrastructure-scale deployment.

Methodology

To be included in this list of cleantech companies, companies must be:

  • Headquartered in the UK
  • Operating in the ‘CleanTech’ Beauhurst industry classification
  • Listed as ‘Active’ on Companies House

We’ve then ranked these companies by total equity raised.

If you’re a Beauhurst subscriber, you can view this list directly in the platform and apply additional filters to refine the results.

Analysis accurate as of 19 May 2026. The table below is updated weekly to reflect the most recent data from the Beauhurst platform.

Top 100 cleantech companies in the UK

10.

Total amount raised: £185m
Total equity rounds: 5
Established: 2014
Location: Oxford

Oxa develops software designed to power driverless vehicles, with technology that uses features such as cameras and lasers in order to sense and navigate the surrounding environment. In 2023, the UK government announced that Oxa had been included in their Advanced Manufacturing Plan, setting out £150m of investment to supercharge the self-driving vehicle sector. They have received £185m to date through five rounds of fundraising, including £113m in December 2022, aimed at selling its software to a wider range of industries and growing worldwide.

9. Callsign

Total amount raised: £215m
Total equity rounds: 5
Established: 2010
Location: City of London

Focusing on creating smooth customer interactions, AI company Callsign has produced technology for passive authentication, fraud prevention, and intelligence. Its proprietary technology uses artificial intelligence to mimic how humans recognise each other. In October 2021, Visa choseCallsign as their preferred behavioural biometric and device intelligence identity partner across Europe. Callsign is the world’s fastest-growing behavioural authentication and intelligence company. It has raised a total of £215m in investment, across five funding rounds. The company’s main investors include JP Morgan, AllegisCyber, and NightDragon Security.

8. Lendable

Total amount raised: £216m
Total equity rounds: 7
Established: 2014
Location: Hackney

Lendable is a fintech company developing a peer-to-peer lending platform for consumer finance. The company’s AI software matches users with appropriate investors, leveraging artificial intelligence and automated underwriting to quickly approve loans. Lendable also offers loans to those with lower credit scores to provide a fairer borrowing solution. Lendable has raised £216m, across seven funding rounds, since 2014. It’s expanded to offices in New York, Nairobi, and Singapore, and has featured in several high growth lists: 2022’s FT 1000, the Deloitte Fast 50 in both 2019 and 2020, and the Fast Tech Track 100, also in 2019 and 2020. Additionally, in 2018, Lendable participated in Addleshaw Goddard’s AG Elevate accelerator programme for scaling fintech startups.

7. Huma

Total amount raised: £236m
Total equity rounds: 10
Established: 2011
Location: Westminster

​​Huma (previously Medopad) is developing a web-based portal for hospitals and healthcare professionals to contain, manage, and collect health records. This data is then accessible to patients through a mobile app. Alongside its main goal of managing healthcare data, Huma also works on digital health insights and has developed wearable technology to detect digital biomarkers and assess health in real-time. Huma has been working with many organisations around the world, including the NHS, to monitor COVID-19 patients remotely. The AI company has secured £236m in fundraisings, from investors including Healthbox, Nexus Investments, Bayer, and NWS Holdings. In 2020, the company acquired two businesses: stress and productivity biometric startup BioBeats, and Tarilian, an optoelectronic sensor company that makes technology for measuring blood pressure and heart monitoring. They have since acquired Alcedis, developers of a platform for the digitisation of clinical trials that can be integrated with third-party systems, and iPLATO, developers of an app that improves patients’ access to GP practices through an online booking system, and provides a platform for healthcare campaigns.

6. Patsnap

Total amount raised: £251m
Total equity rounds: 4
Established: 2007
Location: Southwark

Patsnap has created a web-based platform to help clients assess intellectual property patents, with access to patent expiry dates, licensing, renewal, and legal information for tech companies. The lawtech company’s platform is powered by artificial intelligence algorithms and natural language processing, to parse patents and IP, as well as extract and cross-match critical information. It can even analyse more complex documents, like clinical trials, chemical structures patents, and litigation records. Patsnap has over 10k customers in over 50 countries, including big names like Tesla, Dyson, and NASA. So far, the company has secured £251m in investment, across four funding rounds.

5. Quantexa

Total amount raised: £286m
Total equity rounds: 6
Established: 2016
Location: Lambeth

Quantexa is a cybersecurity firm that develops AI technology to secure organisations’ data and flag illegal activity. It works closely with industries that handle large datasets (such as banking, e-commerce, and the public sector), to create analytical models that uncover data risk, reveal opportunities, and enhance decision making. The company is backed by AlbionVC, Dawn Capital, HSBC Enterprise Fund, and Accenture, among others. In its latest funding round, Quantexa raised £104m in investment. This took the company’s total fundraisings to £286m. Quantexa has attended both the Microsoft ScaleUp accelerator and Tech Nation’s Future Fifty accelerator. It has also appeared on several high-growth lists, including The Telegraph’s Tech Hot 100, Fast Track’s Tech Track 100, InsurTech 100, and the 2021 edition of The Regtech 100.

4. Gousto

Total amount raised: £321m
Total equity rounds: 14
Established: 2012
Location: Shepherds Bush

Gousto is a meal kit delivery service that provides exact ingredients and portions to customers with instructions on how to prepare the dish. The food tech unicorn, backed by celebrity fitness coach, Joe Wicks, and Japanese investment giant SoftBank, is powered by AI, a technology used since its founding. They have received £321m in funding to date, through 14 rounds of funding. The most recent of these was in February 2023, which saw £50m invested to support them during times of economic uncertainty. Their post-money valuation was listed as £239m. They have been named on a number of high-growth lists, including the FT 1000, Fast Track Tech Track 100, and Top 100 – Britain’s Fastest Growing Businesses. They also attended the Future Fifty accelerator in 2017.

3. Cera

Total amount raised: £366m
Total equity rounds: 9
Established: 2015
Location: Islington

Cera provides homecare, telehealth consultations, and prescription services, which can be managed through a mobile app, which also allows users to book appointments with nurses on demand. To date, they have secured £366m through nine rounds of fundraising. In August 2022, they raised £81.3m to invest in increasing their capacity to help more patients, a project that was invested into by 8090 Partners, Evolve Healthcare Partners, Guinness Ventures, and Jane Street, amongst others. They have attended DigitalHealth.London Accelerator, PwC Scale Programmes, and Govstart.

2. Thought Machine

Total amount raised: £392m
Total equity rounds: 8
Established: 2011
Location: Islington

Thought Machine develops fintech software Vault, which enables banks and financial services providers to centrally manage a range of products. Its core banking platforms can be used to run day-to-day operations, improving the cost, speed, and adaptability of legacy systems. Thought Machine’s software is accessed through an API and has a large artificial intelligence component. The AI company has raised £398m in growth capital so far, across seven funding rounds, with the likes of Molten Ventures (previously Draper Esprit), IQ Capital, Playfair Capital, and British Patient Capital. Its most recent fundraising, secured in July 2020, saw the company valued at £221m pre-money. Alongside new investors ING Ventures, JP Morgan Chase Strategic Investments, and Standard Charter Investments, this latest raise also saw Thought Machine reach unicorn status.

1. Graphcore

Total amount raised: £528m
Total equity rounds: 9
Established: 2016
Location: City of Bristol

Graphcore operates in the semiconductor processing chip industry, developing and manufacturing chips made specifically to accelerate artificial intelligence and machine learning tasks. Graphcore’s chips use Intelligence Process Unit (IPU) technology, housing 1,472 separate IPU-Cores, capable of executing 8,832 separate parallel computing threads. The Bristol-based AI startup has grown from strength to strength since 2016, with a total of nine funding rounds under its belt, which saw it reach unicorn status after just four years of trading. Graphcore has raised more than half a billion pounds in investment, and is partnered with large tech companies such as Microsoft and Dell Technologies. The company has offices in London, Cambridge, Oslo, Beijing, Seoul, and across the US.
Last Updated: 12 June 2026
# Company Region Stage Employees Total Raised
1 Centrica South East Established >1000 £1,126,000,000

Centrica

Centrica generates, stores, and supplies energy to customers.

https://www.centrica.com/
Industries Electricity generation Energy management and reduction Energy storage Energy utilities Heating, ventilation, air conditioning and mechanical and electrical systems Oil and gas Renewable energy Repair, maintenance and servicing
2 GRIDSERVE South West Established 250-499 £622,570,143

GRIDSERVE

GRIDSERVE develops sustainable energy technology for solar storage, with applications such as charging points for electric vehicles, as well as operating solar farms.

https://www.gridserve.com/
Industries Application software Cars, motorcycles and other road vehicles Electricity generation Energy storage Renewable energy
3 ITM Power Yorkshire and The Humber Established 250-499 £520,800,000

ITM Power

ITM Power develops and manufactures energy production and storage technology for hydrogen fuel.

http://www.itm-power.com/
Industries Energy management and reduction Energy storage Freight and haulage Manufacturing Renewable energy
4 Highview Power London Growth 50-99 £506,911,983

Highview Power

Highview Power designs and develops large-scale energy storage solutions for utility and distributed power systems.

https://highviewpower.com/
Industries Energy storage Energy utilities
5 Fidra Energy London Venture 10-24 £445,000,000

Fidra Energy

Fidra Energy develops, builds, and operates large-scale energy storage projects.

https://fidraenergy.com/
Industries Energy management and reduction Energy storage Energy utilities Property development and construction Renewable energy
6 Conrad Energy South East Established 100-249 £405,222,490

Conrad Energy

Conrad Energy develops, operates, and manages energy generation and storage assets for businesses and the national grid.

https://conradenergy.co.uk/
Industries Application software Data provision and analysis Electricity generation Energy management and reduction Energy storage Energy utilities Renewable energy Robots and automation
7 Field London Growth 250-499 £303,339,913

Field

Field develops, builds and operates renewable energy infrastructure, specialising in battery energy storage systems (BESS), aiming to efficiently store and distribute energy to the grid.

https://www.field.energy/
Industries Energy management and reduction Energy storage Energy utilities Manufacturing Renewable energy
8 Nexeon South East Growth 100-249 £272,824,544

Nexeon

Nexeon develops and manufactures silicon-based anode technology for batteries.

https://www.nexeonglobal.com/
Industries Cars, motorcycles and other road vehicles Electronics hardware Energy storage Manufacturing Medical devices and instruments Parts and components
9 Connected Kerb London Growth 50-99 £182,694,577

Connected Kerb

Connected Kerb manufactures and installs electric vehicle charging points in urban environments, and develops an app allowing customers to locate charging points.

https://www.connectedkerb.com/
Industries Application software Cars, motorcycles and other road vehicles Data provision and analysis Energy utilities Manufacturing
10 Fuse London Venture 100-249 £158,455,570

Fuse

Fuse provides renewable energy utilities services, with the aim of decentralising access to clean energy generation.

https://www.fuseenergy.com/
Industries Application software Electricity generation Energy management and reduction Energy utilities Heating, ventilation, air conditioning and mechanical and electrical systems Oil and gas Renewable energy
11 Mura Technology North East Growth 25-49 £155,944,862

Mura Technology

Mura Technology develops technology which aims to convert end-of-life plastic waste into refined synthetic hydrocarbon products, including low carbon synthetic crude oil.

https://muratechnology.com/
Industries Oil and gas Plastics and rubber Waste management and recycling
12 Carbon Clean London Established 100-249 £151,364,961

Carbon Clean

Carbon Clean develops carbon capture technology that aims to help industries engage in carbon reduction.

https://www.carbonclean.com/
Industries Chemicals Energy management and reduction Environmental consultancy Heavy equipment and machinery Manufacturing
13 Ark Data Centres South West Established 100-249 £150,000,000

Ark Data Centres

Ark Data Centres designs and runs data centres for businesses, aiming to offer sustainable energy, connectivity and security.

https://www.ark-d-c.com/
Industries Data centres Energy management and reduction Technology consultancy and IT and telecommunications support
14 CuspAI East of England Venture 10-24 £144,460,725

CuspAI

CuspAI develops an AI material search engine that generates chemical compositions for novel materials, with a focus on climate technologies.

https://www.cusp.ai/
Industries Application software Chemicals Data aggregation Data provision and analysis Materials technology Physical product design, testing and quality assurance
15 Intelligent Energy East Midlands Established 100-249 £136,862,385

Intelligent Energy

Intelligent Energy develops low carbon fuel cell systems for use in the automotive, consumer electronics, and stationary power industries.

http://www.intelligent-energy.com/
Industries Electricity generation Energy management and reduction Manufacturing Parts and components Renewable energy
16 AMP Clean Energy London Established 100-249 £136,764,387

AMP Clean Energy

AMP Clean Energy supplies biomass and biofuel products and related services, and assists businesses in financing the switch to using biofuels.

https://www.ampcleanenergy.com/
Industries Loans, debt and grants Renewable energy
17 Nyobolt East of England Growth 100-249 £134,004,536

Nyobolt

Nyobolt develops fast-charging battery technologies, designed to prevent battery degradation typically associated with fast-charging batteries.

https://nyobolt.com/
Industries Electronics hardware Energy storage Renewable energy Robots and automation
18 GenPhoenix East of England Established 100-249 £132,874,287

GenPhoenix

GenPhoenix recycles leather offcuts and other textile waste to produce environmentally-friendly, circular materials for commercial use.

https://genphoenix.com/
Industries Distribution and wholesale Fabrics and textiles Manufacturing Materials technology Waste management and recycling
19 GeoPura East Midlands Growth 100-249 £122,999,999

GeoPura

GeoPura produces zero-emission hydrogen fuel using renewable energy.

https://www.geopura.com/
Industries Electricity generation Energy storage Energy utilities Freight and haulage Oil and gas Product rental and hire Renewable energy
20 First Light Fusion South East Growth 100-249 £111,235,809

First Light Fusion

First Light Fusion researches nuclear fusion, that is, energy generation by fusing together hydrogen atoms.

https://firstlightfusion.com/
Industries Electricity generation Energy utilities Heavy equipment and machinery Manufacturing Materials technology Nuclear energy Physical product design, testing and quality assurance
21 CycleØ London Venture 10-24 £110,432,309

CycleØ

CycleØ produces energy and biofuel products using recycled agricultural waste.

https://www.cycle0.com/
Industries Agriculture, land farming and forestry Electricity generation Food and drink processing Oil and gas Renewable energy Waste management and recycling
22 Agrivert Aberdeen Established 10-24 £107,000,000

Agrivert

Agrivert specialises in organic waste management (anaerobic digestion, in-vessel composting, green waste composting and the treatment and recycling of biosolids for the water sector).

http://www.agrivert.co.uk/
Industries Renewable energy Waste management and recycling
23 Ceres South East Established 500-999 £103,000,000

Ceres

Ceres develops fuel cell and solid oxide technology for use by power generation and hydrogen production companies.

https://www.ceres.tech/
Industries Data centres Electricity generation Energy storage Energy utilities Environmental consultancy Heavy equipment and machinery Manufacturing Materials technology Renewable energy
24 Intelligent Growth Solutions Tayside Growth 100-249 £102,537,714

Intelligent Growth Solutions

Intelligent Growth Solutions (IGS) operates a vertical farm.

https://www.intelligentgrowthsolutions.com/
Industries Agriculture, land farming and forestry Application software Data provision and analysis Flowers, trees and other plants Food and drink processing Lighting
25 Noda East of England Growth 100-249 £100,349,089

Noda

Noda develops a buildings intelligence platform that analyses Internet of Things technology, with the aim of making buildings more efficient and sustainable.

https://noda.ai/
Industries Application software Data provision and analysis Energy management and reduction Robots and automation
26 Low Carbon South West Growth 100-249 £100,000,004

Low Carbon

Low Carbon develops, invests in, and operates large-scale renewable energy projects including solar, wind, waste-to-energy, and energy storage.

https://www.lowcarbon.com/
Industries Energy management and reduction Energy storage Manufacturing Renewable energy
27 Circtec London Venture 10-24 £94,068,472

Circtec

Circtec develops technology designed to convert waste into oil.

https://www.circtec.com/
Industries Chemicals Manufacturing Oil and gas Waste management and recycling
28 Kensa Group South West Established 100-249 £91,800,000

Kensa Group

Kensa Group operates a group of manufacture and installation companies, including Kensa Contracting, Kensa Utilities and Kensa Heat Pumps.

https://kensa.co.uk/
Industries Energy utilities Heating, ventilation, air conditioning and mechanical and electrical systems Property development and construction Tradespeople and trade services
29 BeZero Carbon London Growth 100-249 £85,418,897

BeZero Carbon

BeZero Carbon develops a carbon ratings platform, which aims to rate and assess risk for carbon reduction projects.

https://bezerocarbon.com/
Industries Application software Energy management and reduction Environmental consultancy Investment banking and corporate finance Renewable energy Risk and compliance Robots and automation
30 Iceotope Yorkshire and The Humber Established 50-99 £83,418,759

Iceotope

Iceotope develops a liquid cooling system which is designed to reduce temperatures in electronic systems such as data centres.

https://www.iceotope.com/
Industries Data centres Electronics hardware Energy management and reduction Heating, ventilation, air conditioning and mechanical and electrical systems Server hardware
31 Invinity Energy Systems London Established 100-249 £82,380,000

Invinity Energy Systems

Invinity Energy Systems manufactures vanadium flow batteries for non-lithium grid-scale energy storage.

https://invinity.com/
Industries Energy storage Manufacturing Renewable energy
32 Evolito South East Growth 100-249 £80,435,676

Evolito

Evolito manufactures electrical motors for the aerospace industry.

https://evolito.aero/
Industries Aircraft Heating, ventilation, air conditioning and mechanical and electrical systems Manufacturing Parts and components
33 CompactGTL Wales Growth 10-24 £75,691,807

CompactGTL

CompactGTL has developed technology for converting the gases produced as a by-product of oil extraction into liquid fuels. The company's technology is modular and can be used at small or remote oil extraction sites.

https://www.compactgtl.com/
Industries Oil and gas
34 Aquora London Venture 25-49 £70,958,701

Aquora

Aquora manufactures subsea cabling for renewable energy sources.

https://www.aquora.co.uk/
Industries Energy management and reduction Energy utilities Manufacturing Parts and components Renewable energy
35 Ecotricity South West Established 500-999 £70,000,000

Ecotricity

Ecotricity generates and supplies green electricity to homes and businesses.

https://www.ecotricity.co.uk/
Industries Electricity generation Energy utilities Renewable energy
36 char.gy London Growth 50-99 £69,639,812

char.gy

char.gy develops on-street charging points for electric vehicles.

https://char.gy/
Industries Application software Cars, motorcycles and other road vehicles Energy storage
37 Bowman Power South East Established 50-99 £67,878,364

Bowman Power

Bowman Power develops and manufactures turbo generators that convert waste heat from engines into usable power.

https://bowmanpower.com/
Industries Electricity generation Energy management and reduction Heavy equipment and machinery Manufacturing Physical product design, testing and quality assurance
38 Azuri Technologies East of England Growth 100-249 £67,012,316

Azuri Technologies

Azuri Technologies supplies solar panel units to individuals in rural Africa, where the costs are recovered using a "pay as you go" system which lasts for 18 months, at the end of which the panel can be upgraded or is free to use.

https://www.azuri-group.com/
Industries Energy management and reduction Energy storage Energy utilities Renewable energy Technology consultancy and IT and telecommunications support
39 HomeTree London Growth 100-249 £65,620,843

HomeTree

HomeTree provides residential energy services to allow home-owners to manage and install renewable energy systems.

https://www.hometree.co.uk/
Industries Electricity generation Energy management and reduction Energy storage Heating, ventilation, air conditioning and mechanical and electrical systems Renewable energy Repair, maintenance and servicing Tradespeople and trade services
40 Myenergi Yorkshire and The Humber Established 250-499 £61,849,968

Myenergi

Myenergi designs and manufactures renewable energy products that are intended to increase the efficiency and sustainability of existing systems.

https://www.myenergi.com/
Industries Application software Distribution and wholesale Electronics hardware Mobile, internet and wireless hardware Online retailing Renewable energy Sensors
41 Orbital Marine Power Highlands and Islands Established 25-49 £61,348,781

Orbital Marine Power

Orbital Marine Power develops and manufactures a floating tidal turbine.

https://www.orbitalmarine.com/
Industries Ports, docks and marine infrastructure Renewable energy
42 Hubber London Seed <5 £60,000,000

Hubber

Hubber develops electric vehicle charging infrastructure and related urban energy services.

https://hubber-infra.co.uk/
Industries Cars, motorcycles and other road vehicles Civil engineering Electricity generation Energy storage Property development and construction Renewable energy
43 Econic Technologies North West Growth 25-49 £54,226,990

Econic Technologies

Econic Technologies develops catalysts for the conversion of waste carbon dioxide into polyurethanes and polycarbonates for the plastics industry.

https://www.econic-technologies.com/
Industries Energy management and reduction Materials technology Plastics and rubber
44 Orbital Industries London Venture 10-24 £53,903,483

Orbital Industries

Orbital Industries develops a generative AI platform to discover clean energy technologies and green materials, specialising in carbon removal and energy transition solutions.

https://www.orbitalindustries.com/
Industries Chemicals Data centres Energy management and reduction Materials technology Renewable energy
45 Addionics London Venture 50-99 £53,482,525

Addionics

Addionics develops and manufactures battery components which aim to increase the capacity, charging abilities and lifespan of electric vehicle batteries.

https://addionics.com/
Industries Energy storage Manufacturing Materials technology Parts and components Physical sciences research
46 Blue International London Growth 5-9 £52,096,292

Blue International

Blue International operates a mining and renewable energy company.

https://blueinternational.com/
Industries Electricity generation Gemstones and precious metals Mining, boring and drilling Renewable energy
47 Nature Metrics South East Growth 100-249 £51,286,248

Nature Metrics

Nature Metrics develops a software platform for environmental survey, monitoring and regulatory compliance, and offers an eDNA (environmental DNA testing kit) for biodiversity analysis, with the aim of helping users to reduce harmful environmental impacts.

https://www.naturemetrics.com/
Industries Application software Biotechnology Data provision and analysis Environmental consultancy Land, water and air management Property and environmental survey Research tools and reagents Risk and compliance
48 Echion Technologies East of England Growth 50-99 £50,901,736

Echion Technologies

Echion Technologies seeks to commercialise the production of lithium-ion batteries by developing cost effective components, such as using alternative materials for the battery's active anode.

https://www.echiontech.com/
Industries Energy storage Manufacturing Parts and components
49 HydraB Power South East Growth >1000 £50,000,000

HydraB Power

HydraB Power operates Bamford Bus Company, a holdings company for Wrightbus, as well as hydrogen production and supply companies Ryze Hydrogen and HyGen Energy .

Industries Cars, motorcycles and other road vehicles Distribution and wholesale Electricity generation Energy management and reduction Energy storage Renewable energy
50 Cambridge GaN Devices East of England Growth 50-99 £49,123,496

Cambridge GaN Devices

Cambridge GaN Devices develops Gallium Nitride Technology (GaN) for applications in energy-saving electronics.

https://camgandevices.com/
Industries Chips and processors Electronics hardware Energy management and reduction Manufacturing Parts and components
51 InstaVolt South East Growth 100-249 £48,659,480

InstaVolt

InstaVolt operates a public electric vehicle rapid charging network, providing high power charging services to drivers across the UK.

https://instavolt.co.uk/
Industries Application software Cars, motorcycles and other road vehicles Energy management and reduction Energy storage Manufacturing Payment processing Renewable energy
52 Celtic Renewables East of Scotland Growth 50-99 £47,993,776

Celtic Renewables

Celtic Renewables produces biofuels from byproducts from the whisky industry.

https://www.celtic-renewables.com/
Industries Animal feed and pet food Chemicals Renewable energy Waste management and recycling
53 Modo Energy London Growth 50-99 £47,514,498

Modo Energy

Modo Energy develops a platform that provides data analytics and insights for the renewable energy industry.

https://modoenergy.com/
Industries Application software Data provision and analysis Energy management and reduction Energy storage Renewable energy
54 HIVED London Growth 250-499 £44,740,000

HIVED

HIVED provides an emission-free distribution and delivery service.

https://www.hived.space/
Industries Application software Collection and delivery Distribution and wholesale Freight and haulage Supply chain management Warehouses (bonded and non-bonded)
55 HiiROC South East Growth 100-249 £43,620,851

HiiROC

HiiROC develops technology which aims to produce low-cost and and zero-emission hydrogen.

https://hiiroc.com/
Industries Renewable energy
56 Aura Power South West Venture 50-99 £43,000,000

Aura Power

Aura Power develops renewable energy projects including battery storage systems and solar farms.

https://www.aurapower.com/
Industries Energy management and reduction Energy storage Property development and construction Renewable energy
57 Eden Research South East Established 10-24 £41,137,991

Eden Research

Eden Research develops sustainable biopesticides and plastic-free microencapsulation technologies.

https://www.edenresearch.com/
Industries Agriculture, land farming and forestry Healthcare products, toiletries and living aids Pets
58 Converge West Midlands Growth 50-99 £40,976,954

Converge

Converge develops sensors and software that collates the information collected from these sensors, so that the data can be analysed in real-time. The sensors are able to monitor a multitude of metrics, dependent on the user's requirements.

https://www.converge.io/
Industries Application software Data aggregation Data provision and analysis Electronics hardware Energy management and reduction Property development and construction Sensors
59 Nattergal East of England Seed 10-24 £40,000,000

Nattergal

Nattergal provides nature conservation and restoration services, with a focus on 'rewilding' natural ecosystems.

https://www.nattergal.co.uk/
Industries Agriculture, land farming and forestry Environmental consultancy Gardening, landscaping and tree surgery Land, water and air management Property and land assets investment Property and land assets management
60 Arenko London Growth 50-99 £38,358,752

Arenko

Arenko develops battery storage units that store off-peak, waste, and cheaper electricity, and facilitates the delivery of this stored energy through its own electricity pipeline services.

https://arenko.group/
Industries Application software Data provision and analysis Energy storage Robots and automation
61 Eneus Energy East of Scotland Growth 10-24 £38,170,076

Eneus Energy

Eneus Energy provides industries with modification services to convert their industrial technology to producing renewable energy.

https://www.eneusenergy.com/
Industries Chemicals Energy management and reduction Renewable energy
62 Freevolt Technologies London Established 5-9 £37,872,068

Freevolt Technologies

Freevolt Technologies develops smart cards and other biometric technology for access control and fraud prevention, utilising existing radio frequency energy.

https://freevolt.tech/
Industries Application software Embedded systems Environmental consultancy Hospitals and clinics Security and surveillance
63 Forest London Growth 250-499 £37,375,484

Forest

Forest develops a mobile app that enables users to hire e-bikes, with the aim of decreasing CO2 emissions by incentivising people to use clean transport.

https://www.forest.me/
Industries Application software Bicycles and scooters Renewable energy
64 i2O Water South East Established 25-49 £36,311,970

i2O Water

i2O Water has developed technology that aims to optimise the pressure in water networks (thus reducing leakages and bursts) through smart control pumps and pressure-reducing valves.

http://en.i2owater.com/
Industries Energy management and reduction Energy utilities
65 E1 Series London Growth 50-99 £35,838,799

E1 Series

E1 Series develops sustainable electric powerboats, which are designed for racing.

https://www.e1series.com/
Industries Boats and ships Sporting events and activities
66 Colorifix East of England Venture 50-99 £35,586,469

Colorifix

Colorifix develops new dyeing processes using synthetic biological techniques designed to decrease the textile industry's use of fresh water.

https://colorifix.com/
Industries Chemicals Fabrics and textiles
67 NOTPLA London Growth 50-99 £35,484,102

NOTPLA

NOTPLA has designed an edible water bottle, which is made of seaweed.

https://www.notpla.com/
Industries Flowers, trees and other plants Manufacturing Packaging and printing Waste management and recycling
68 ev.energy London Growth 100-249 £35,248,312

ev.energy

ev.energy develops a mobile app designed to help users track electric vehicle costs and carbon usage, as well as optimise at-home charging times for electric vehicles.

https://www.ev.energy/
Industries Application software Budgeting and financial management Data provision and analysis Energy management and reduction Renewable energy
69 Epoch Biodesign London Venture 50-99 £35,131,304

Epoch Biodesign

Epoch Biodesign uses AI to develop an enzyme that aims to aid in the bio-recycling of plastics.

https://www.epochbiodesign.com/
Industries Biotechnology Plastics and rubber Research tools and reagents Waste management and recycling
70 GEL South West Established 10-24 £34,211,101

GEL

GEL develops and operates geothermal energy power plants.

https://gel.energy/
Industries Electricity generation Property development and construction Renewable energy
71 Heliex Power West of Scotland Growth 25-49 £33,433,230

Heliex Power

Heliex Power develops technology that aims to recover energy from steam and use it to generate electricity.

https://www.heliexpower.com/
Industries Energy management and reduction Heavy equipment and machinery Renewable energy
72 Levidian East of England Growth 50-99 £32,649,999

Levidian

Levidian develops decarbonisation technology to produce graphene and hydrogen and reduce carbon output.

https://www.levidian.com/
Industries Energy management and reduction Renewable energy
73 Origen West Midlands Growth 50-99 £32,320,009

Origen

Origen develops technology that aims to use natural gas to produce energy without carbons emissions.

https://www.origencarbon.com/
Industries Energy management and reduction Energy utilities Environmental consultancy Oil and gas Renewable energy Waste management and recycling
74 i6 Group South East Growth 50-99 £32,100,000

i6 Group

i6 Group develops fuel management software for airlines and the aviation industry, aiming to allow integration with existing systems.

https://www.i6.io/
Industries Aircraft Application software Data provision and analysis Energy management and reduction Passenger airlines Robots and automation
75 Naked Energy South East Growth 25-49 £31,984,688

Naked Energy

Naked Energy has developed Virtu, a solar panel placed inside a vacuum tube. This creates a stable temperature and enables the generation of both energy and heat.

https://nakedenergy.com/
Industries Electricity generation Renewable energy
76 Enoda London Venture 100-249 £31,817,281

Enoda

Enoda develops energy saving technology which is used to provide a decarbonised alternative power source to combined heat and power.

https://www.enoda.com/
Industries Energy management and reduction Heating, ventilation, air conditioning and mechanical and electrical systems
77 AlertMe South East Exited 100-249 £31,750,000

AlertMe

AlertMe has developed a device that aims to help homeowners reduce energy consumption. The company also enables clients to check their energy consumption online.

http://www.alertme.com/
Industries Application software Energy management and reduction
78 Circulor London Growth 50-99 £31,542,171

Circulor

Circulor develops software designed to track carbon production in industrial supply chains.

https://www.circulor.com/
Industries Application software Supply chain management
79 Advanced Electric Machines North East Growth 50-99 £31,531,111

Advanced Electric Machines

Advanced Electric Machines manufactures electric motors designed for low carbon, commercial vehicles.

https://advancedelectricmachines.com/
Industries Cars, motorcycles and other road vehicles Manufacturing Parts and components
80 Cool Planet Technologies London Venture 10-24 £31,307,534

Cool Planet Technologies

Cool Planet Technologies develops membrane-based carbon capture technology to be used for industrial flue gas emissions.

https://coolplanettech.com/
Industries Energy management and reduction Land, water and air management Oil and gas Renewable energy
81 AlgaeCytes South East Growth 10-24 £30,674,339

AlgaeCytes

AlgaeCytes develops algae strains that can be harvested for a variety of uses, mainly in pharmaceutical research and in food production and processing.

https://algaecytes.com/
Industries Beauty and cosmetics Chemicals Pharmaceuticals Vitamins and other supplements
82 Maeving West Midlands Venture 50-99 £29,898,858

Maeving

Maeving designs and manufactures electric bikes.

https://maeving.com/
Industries Application software Cars, motorcycles and other road vehicles Manufacturing Online retailing Physical product design, testing and quality assurance
83 Biogen East of England Growth 100-249 £29,750,000

Biogen

Biogen develops and operates anaerobic digestion (AD) plants nationally which generate renewable energy from organic waste matter.

http://www.biogen.co.uk/
Industries Agriculture, land farming and forestry Electricity generation Energy management and reduction Renewable energy Waste management and recycling
84 Chargemaster South East Exited 100-249 £29,230,914

Chargemaster

Chargemaster provides a comprehensive range of electric vehicle charging points that have been developed to accommodate new technological advances.

http://www.chargemasterplc.com/
Industries Cars, motorcycles and other road vehicles Electronics hardware Energy storage
85 Immaterial East of England Venture 25-49 £29,200,915

Immaterial

Immaterial has developed technology to shape metal-organic frameworks (MOFs) from their powdered form, into pellets which have greater density and volumetric storage capacity. The company uses the technology to produce highly porous nanomaterials for more energy efficient gas separation and storage, tailored to be selective for specific gases.

https://immaterial.com/
Industries Materials technology
86 Connected Energy North East Growth 25-49 £28,212,094

Connected Energy

Connected Energy develops energy storage systems from used electric vehicle batteries.

https://connected-energy.co.uk/
Industries Cars, motorcycles and other road vehicles Energy management and reduction Energy storage
87 ETA Green Power East of England Venture 25-49 £28,064,168

ETA Green Power

ETA Green Power develops and delivers new electrification solutions, including electric drive systems for various industries.

https://eta-gp.com/
Industries Cars, motorcycles and other road vehicles Electronics hardware Heating, ventilation, air conditioning and mechanical and electrical systems Heavy equipment and machinery Manufacturing Parts and components
88 Gigaton London Venture 25-49 £27,987,800

Gigaton

Gigaton develops energy management and reduction technology using artificial intelligence, specialising in software for manufacturing companies.

https://gigaton.co/
Industries Application software Energy management and reduction Manufacturing Renewable energy Robots and automation
89 C-Capture Yorkshire and The Humber Growth 25-49 £27,864,999

C-Capture

C-Capture develops a solvent system which captures carbon dioxide from the gas streams of coal-fired power stations and other power generation sites, aiming to make coal a more environmentally acceptable energy source.

https://c-capture.co.uk/
Industries Electricity generation Waste management and recycling
90 Hydro Industries London Growth 25-49 £27,826,007

Hydro Industries

Hydro Industries has developed an electrochemical water purification process with applications in a variety of industries (marine, oil and gas, mining). The company also produces drinking water treatment units.

https://hydro-industries.co.uk/
Industries Energy utilities Hazard and damage control Heavy equipment and machinery Land, water and air management Manufacturing Waste management and recycling
91 Mixergy South East Growth 50-99 £27,634,347

Mixergy

Mixergy designs and manufactures hot water tanks.

https://mixergy.co.uk/
Industries Energy management and reduction Heating, ventilation, air conditioning and mechanical and electrical systems Renewable energy
92 ERM London Established >1000 £27,528,651

ERM

ERM provides environmental, sustainability, risk and health and safety consultancy services.

http://www.erm.com/
Industries Application software Data management Data provision and analysis Energy management and reduction Environmental consultancy Graphic design Health and safety Investment banking and corporate finance Land, water and air management Management and strategy consultancy Marketing, branding and advertising Renewable energy Risk and compliance Supply chain management Tutoring, training, coaching and skills development Video content (including pre- and post-production)
93 GoCycle London Growth 10-24 £27,434,808

GoCycle

GoCycle manufactures electric bicycles.

https://gocycle.com/
Industries Bicycles and scooters Distribution and wholesale Online retailing
94 Axle Energy London Venture 10-24 £26,899,985

Axle Energy

Axle Energy develops an API which connects energy assets to electricity markets, aiming to create a more flexible electricity system built on renewable energy.

https://www.axle.energy/
Industries Application software Energy management and reduction Energy utilities Renewable energy
95 ATOME Yorkshire and The Humber Venture 10-24 £26,890,000

ATOME

ATOME develops and produces green fertiliser using renewable energy.

https://www.atomeplc.com/
Industries Agriculture, land farming and forestry Chemicals Renewable energy
96 Binding Solutions North East Growth 25-49 £26,152,627

Binding Solutions

Binding Solutions develops a process of metal production from ores, that aims to reduce carbon emissions in the metals and mining industries.

https://www.bindingsolutions.uk/
Industries Materials technology Mining, boring and drilling Non-precious metals, steel and other alloys Provision of raw materials
97 Mission Zero Technologies London Venture 25-49 £26,021,847

Mission Zero Technologies

Mission Zero Technologies develops renewable energy generation technology, specialising in carbon capture technology.

https://www.missionzero.tech/
Industries Biotechnology Renewable energy
98 Indra West Midlands Growth 100-249 £26,000,000

Indra

Indra manufactures products and electronics for electric vehicles (EV), alongside smart EV chargers and home energy storage batteries.

https://www.indra.co.uk/
Industries Cars, motorcycles and other road vehicles Electricity generation Energy storage
99 Moixa London Exited 50-99 £25,267,067

Moixa

Moixa develops smart battery technology designed to optimise renewable energy usage, which can be monitored with its GridShare energy management software.

https://moixa.com/
Industries Application software Energy management and reduction Energy storage Energy utilities Renewable energy
100 KiWi Power London Exited 25-49 £25,080,875

KiWi Power

KiWi Power installs devices to manage the electricity demand of companies during peak times, reducing the cost and pollution associated with the national grid using peaking stations.

https://www.kiwipowered.com/
Industries Electronics hardware Energy management and reduction

Unlock the full list of top 100 cleantech companies

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The future of cleantech in the UK

UK cleantech company formations peaked in 2022 at 1,101 new businesses, then fell sharply to 487 in 2025 — yet annual investment has remained at unprecedented levels, with 2023 (£3.44b), 2024 (£2.39b), and 2025 (£2.95b) all clearing the £2.3b mark and 2026 already at £571m through the first quarter. The pattern is one we’ve now seen repeatedly in our sector series — formations cooling while capital concentrates on a more credible cohort of scaling businesses. In cleantech the gap is unusually stark, reflecting both the capital intensity of deploying energy infrastructure and the sheer breadth of demand pulling investment in.

The structural drivers behind that demand are unlikely to weaken. The UK’s legally binding net-zero-by-2050 target, accelerating EV adoption, AI-driven datacentre power demand, and the continued cost decline in solar, batteries, and electrolysers all create durable pull-through for the technologies in this list. Established operators like Centrica (£1.13b) and OVO Group (£459m) are building out renewable generation and demand-side flexibility at scale, while growth-stage battery and storage businesses including Highview Power (£507m), Field (£303m), Fidra Energy (£445m), and Nyobolt (£134m) are commissioning the infrastructure that will absorb intermittent supply.

A younger cohort of AI-native entrants — CuspAI (£144m) for novel climate materials, BeZero Carbon (£85m) for carbon ratings, Modo Energy (£48m) for renewable analytics, and Oriole Networks (£28m) for low-energy AI compute — points to where the next wave of formations is likely to cluster as software margins meet hard-tech deployment.

With this in mind, it’s possible that — depending on broader economic conditions and the pace of policy support — cleantech enters its second decade as a more concentrated but vastly better-capitalised sector, where the slowdown in new incorporations is offset by larger rounds for fewer, more credible scale-ups. The capital is already there at unprecedented levels; whether the pipeline of new founders rebuilds, or whether the existing cohort consolidates the bulk of the opportunity, will define the next phase of the UK’s energy transition.

FAQ

The top 100 cleantech companies in the UK, ranked by total equity raised, are led by Centrica, GRIDSERVE, ITM Power, Highview Power, and OVO Group. Each has raised more than £459m in equity funding to date.

Companies are ranked by the total amount of equity they have raised across all announced and unannounced fundraisings tracked by Beauhurst.

The top 100 UK cleantech companies have collectively raised £10.3b — 55% of the £18.7b raised by all UK cleantech companies tracked by Beauhurst.

Cleantech refers to technology and services that reduce environmental impact, spanning renewable energy generation, energy storage, electric vehicle infrastructure, hydrogen production, carbon capture and removal, sustainable materials and packaging, circular-economy and recycling technologies, sustainable mobility, climate data and analytics, and energy-efficient computing.

London is home to the largest number of top 100 cleantech companies with 36, followed by the South East (21), the East of England (13), the South West (eight), Yorkshire and The Humber (five), and the North East and West Midlands (four each). The top 100 spans 14 UK regions including all four nations, with the East of England’s 13 entries reflecting a strong Cambridge deep-tech cluster.

The number of active UK cleantech companies has grown 147% over the past decade, from 4,957 in the final quarter of 2015 to 12,218 today. Annual investment has reached unprecedented levels, with 2023 (£3.44b), 2024 (£2.39b), and 2025 (£2.95b) all clearing the £2.3b mark and 2026 already at £571m through the first quarter.

UK cleantech companies operate across a wide range of sub-fields including renewable energy generation (solar, wind, tidal, geothermal, fusion), battery and energy storage, electric vehicle charging infrastructure, hydrogen production, carbon capture and removal, sustainable materials and packaging, plastic recycling, circular-economy platforms, sustainable mobility (e-bikes, electric motorbikes, e-cargo delivery), climate data and analytics, and energy-efficient computing and data centres.

Yes. The ranking includes companies at all stages of evolution. Within the top 100, growth-stage companies are the largest group with 52 entries, followed by established (23), venture-stage (19), exited (four), and seed (two).

The underlying table is updated weekly using the latest data from the Beauhurst platform. Analysis and commentary were last refreshed on 19 May 2026.

All data in this article is sourced from the Beauhurst platform, which tracks equity fundraisings, company financials, and growth signals for UK and German companies.

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