Top CleanTech Companies in the UK
Clean technology is at the forefront of the UK's push towards net zero emissions by 2050. Here are the top cleantech companies in the UK for 2026, ranked by number of employees.
| # | Company | Location | Employees | Revenue |
|---|---|---|---|---|
| 1 | OCTOPUS ENERGY GROUP LIMITED | London | 7,000 | £8.0B |
| One of the UK's largest energy suppliers and a global clean energy technology company. Octopus Energy's Kraken platform manages renewable energy for millions of customers and is licensed to utilities worldwide. | ||||
| 2 | OVO GROUP LTD | Bristol | 6,000 | £6.0B |
| Independent energy technology company and the UK's second-largest energy supplier. OVO develops smart energy solutions and has committed to achieving net zero carbon by 2030 through renewable energy and smart home technology. | ||||
| 3 | CERES POWER HOLDINGS PLC | Horsham | 600 | £50.0M |
| Clean energy technology company developing solid oxide fuel cell and electrolyser technology for power generation and green hydrogen production. Listed on AIM, Ceres licenses its technology to global partners. | ||||
| 4 | OXFORD PHOTOVOLTAICS LIMITED | Oxford | 350 | £20.0M |
| World leader in perovskite solar cell technology, developing next-generation photovoltaics that significantly increase the efficiency of solar panels. Oxford PV spun out of Oxford University. | ||||
| 5 | ITM POWER PLC | Sheffield | 500 | £30.0M |
| Green hydrogen company manufacturing integrated hydrogen energy solutions including PEM electrolysers for producing green hydrogen from renewable electricity. Listed on AIM and based in Sheffield. | ||||
| 6 | AFC ENERGY PLC | Cranleigh | 100 | £5.0M |
| Hydrogen power company developing alkaline fuel cell systems that generate clean electricity from hydrogen. AFC Energy's technology provides zero-emission power for construction sites and off-grid applications. | ||||
| 7 | POD POINT LIMITED | London | 700 | £100.0M |
| Electric vehicle charging company providing home, workplace, and commercial EV charging solutions. Part of the EDF Energy group, Pod Point has installed over 200,000 charge points across the UK. | ||||
| 8 | VERTICAL AEROSPACE GROUP LTD | Bristol | 400 | £10.0M |
| Electric aviation company developing the VX4, a zero-emission electric vertical take-off and landing (eVTOL) aircraft for urban air mobility. Vertical Aerospace has conditional pre-orders worth over $5 billion. | ||||
| 9 | GOOD ENERGY GROUP LIMITED | Chippenham | 300 | £200.0M |
| 100% renewable electricity supplier and clean energy services company. Listed on AIM, Good Energy generates power from its own wind and solar farms and provides energy management solutions. | ||||
| 10 | ECOTRICITY LIMITED | Stroud | 700 | £500.0M |
| Green energy company that builds wind parks and solar parks to generate clean electricity. Founded by Dale Vince, Ecotricity also invests in electric transport and sustainable food production. | ||||
| 11 | PAVEGEN SYSTEMS LTD | London | 50 | £5.0M |
| Cleantech company that developed kinetic energy floor tiles that generate electricity from footsteps. Pavegen's technology is installed in smart cities, transport hubs, and commercial buildings worldwide. | ||||
| 12 | RIPPLE ENERGY LIMITED | Bristol | 50 | £10.0M |
| Community energy company enabling individuals to co-own wind and solar farms. Ripple's cooperatives have over 15,000 members and have built four large-scale renewable energy parks across the UK. | ||||
| 13 | OCTOPUS ENERGY LIMITED | London | 3,000 | £4.0B |
| UK's most-awarded energy supplier providing 100% renewable electricity to millions of homes and businesses. Octopus Energy pioneered smart tariffs that adjust pricing based on renewable energy availability. | ||||
| 14 | OCTOPUS ENERGY SERVICES LIMITED | London | 2,000 | £500.0M |
| Clean energy installation arm of Octopus Energy providing heat pumps, solar panels, EV chargers, and home battery storage systems. Part of the UK's largest home energy technology deployment programme. | ||||
| 15 | OVO ENERGY LTD | Bristol | 4,000 | £5.0B |
| One of the UK's largest independent energy retailers committed to powering progress towards net zero. OVO serves millions of customers with smart energy solutions and green tariffs. | ||||
| 16 | CERES POWER LIMITED | Horsham | 500 | £40.0M |
| Operating subsidiary of Ceres Power developing fuel cell and electrolyser technology for decarbonising heat, power, and transport. Partners include Bosch, Shell, and Doosan. | ||||
| 17 | OXFORD PV LIMITED | Oxford | 200 | £10.0M |
| Oxford-based company commercialising perovskite solar technology, working to bring the world's most efficient solar panels to market and accelerate the transition to clean energy. | ||||
| 18 | TEVVA MOTORS LIMITED | Chelmsford | 200 | £10.0M |
| Electric truck manufacturer developing zero-emission commercial vehicles for urban logistics and last-mile delivery. Tevva's range-extended electric trucks serve the 7.5-19 tonne market. | ||||
| 19 | ALLYE ENERGY LIMITED | London | 50 | £5.0M |
| Mobile energy storage company providing containerised battery systems that deliver clean power to off-grid locations, replacing diesel generators at construction sites, events, and film sets. | ||||
| 20 | POD POINT GROUP HOLDINGS LIMITED | London | 700 | £100.0M |
| Parent company of Pod Point, one of the UK's largest EV charging networks. Listed on the LSE, Pod Point Group is accelerating the rollout of charging infrastructure across homes, workplaces, and public locations. | ||||
| 21 | QUANTEXA LIMITED | London | 800 | £100.0M |
| Decision intelligence platform used by energy companies and regulators to detect fraud, optimise energy trading, and make data-driven decisions in the energy transition. | ||||
| 22 | FEATURESPACE LIMITED | Cambridge | 500 | £60.0M |
| Adaptive analytics platform used by energy companies to detect billing fraud and anomalous consumption patterns, supporting fairer pricing in the renewable energy transition. | ||||
| 23 | EIGEN TECHNOLOGIES LTD | London | 200 | £25.0M |
| AI document intelligence platform used by energy companies and regulators to extract and analyse data from contracts, compliance documents, and environmental reports. | ||||
| 24 | PEAK AI LIMITED | Manchester | 250 | £30.0M |
| Decision intelligence platform used by energy companies to optimise grid management, demand forecasting, and operational efficiency in renewable energy deployment. | ||||
| 25 | FACULTY SCIENCE LIMITED | London | 350 | £50.0M |
| Applied AI company helping energy companies and government bodies deploy machine learning for energy system optimisation, emissions monitoring, and climate policy analysis. | ||||
The United Kingdom has committed to reaching net zero greenhouse gas emissions by 2050, creating enormous opportunities for clean technology companies across the energy, transport, industrial, and built environment sectors. The UK cleantech sector encompasses renewable energy generation, energy storage, electric vehicles, carbon capture, green hydrogen, and sustainable materials.
Government policy has been a major driver of growth in UK cleantech, with measures including contracts for difference for renewable energy, the ban on new petrol and diesel car sales, building energy efficiency regulations, and direct funding for green technology research and development.
The UK has particular strengths in offshore wind energy, where it is one of the world leaders in installed capacity, as well as in electric vehicle technology, battery storage, and smart grid solutions. Cleantech clusters have developed across the country, with notable concentrations in the north-east of England, Scotland, and the south-west.
This ranking lists the largest UK cleantech companies by employee count, covering businesses involved in renewable energy, energy efficiency, sustainable transport, and environmental services. Click on any company to access their full financial profile and corporate details.
Frequently Asked Questions
What is clean technology?
Clean technology, or cleantech, refers to products, services, and processes that reduce negative environmental impacts. This includes renewable energy generation, energy storage, electric vehicles, carbon capture, waste reduction, water treatment, and sustainable building materials.
How is the UK supporting cleantech companies?
The UK government supports cleantech through various mechanisms including contracts for difference for renewable energy projects, research and development grants, tax incentives for green investment, and regulatory frameworks that encourage the transition away from fossil fuels.
What are the main cleantech sectors in the UK?
Key cleantech sectors in the UK include offshore and onshore wind energy, solar power, battery storage and electric vehicles, hydrogen technology, carbon capture and storage, smart grid infrastructure, and sustainable construction materials.
How is the data on these companies collected?
Company data is sourced from Companies House filings and supplemented by technology classification data. Financial figures, employee counts, and director information reflect the most recently available public records.