Top list · United Kingdom

Cleantech startups in the United Kingdom

156 cleantech startups in the United Kingdom have raised money in rounds we track. These are the 50 that have raised the most, $8.9B between them, with London the most common home.

$8.9Braised by these 50
156on our record in all
Londonmost common home
SSEraised the most
  1. 1SSEFounded 1998Perth, United Kingdom$2.7Blast round Jun 2026
  2. 2CuspAICuspAI is an innovative artificial intelligence company based in Cambridge, United Kingdom, with additional teams in Amsterdam and Berlin.

    CuspAI is an innovative artificial intelligence company based in Cambridge, United Kingdom, with additional teams in Amsterdam and Berlin.

    Founded 2024Cambridge, United Kingdom$950Mlast round Jul 2026
  3. 3Octopus Energy GroupOctopus Energy Group is an England-based holding company that operates businesses in areas such as energy generation and electric vehicle sales.

    Octopus Energy Group is an England-based holding company that operates businesses in areas such as energy generation and electric vehicle sales.

    Founded 2016London, United Kingdom$681Mlast round Dec 2025
  4. 4NewcleoNewcleo is an atomic energy company that focuses on developing advanced nuclear energy technologies.

    Newcleo is an atomic energy company that focuses on developing advanced nuclear energy technologies.

    Founded 2021Paris, United Kingdom$563Mlast round Sept 2026
  5. 5ZenobēFounded -United Kingdom$382Mlast round Jul 2025
  6. 6Atrato Onsite EnergyAtrato Onsite Energy is a commercial rooftop solar funder.

    Atrato Onsite Energy is a commercial rooftop solar funder.

    Founded -London, United Kingdom$327Mlast round Apr 2025
  7. 7IchthionIchthion engaged in Development of cutting-edge technology to restore the ocean environment.

    Ichthion engaged in Development of cutting-edge technology to restore the ocean environment.

    Founded 2017United Kingdom$271Mlast round Jan 2024
  8. 8FieldField is Strava for football, tennis and padel.

    Field is Strava for football, tennis and padel.

    Founded 2019United Kingdom$265Mlast round Sept 2024
  9. 9AMPYR Distributed EnergyAMPYR Distributed Energy designs, constructs, owns, and operates sustainable energy technology.

    AMPYR Distributed Energy designs, constructs, owns, and operates sustainable energy technology.

    Founded -London, United Kingdom$229Mlast round May 2025
  10. 10EVCEVC's core focus is on providing convenient, practical and reliable 'destination' charging options for its growing customer base

    EVC's core focus is on providing convenient, practical and reliable 'destination' charging options for its growing customer base

    Founded 2020United Kingdom$199Mlast round Feb 2023
  11. 11GeoPuraGeoPura is enabling the production, transport, and use of zero-emissions fuels with innovative and commercially viable technology.

    GeoPura is enabling the production, transport, and use of zero-emissions fuels with innovative and commercially viable technology.

    Founded 2019Wysall, United Kingdom$194Mlast round Aug 2026
  12. 12Highview PowerHighview Power is a renewable energy company that develops liquid-air energy storage solutions for grid applications.

    Highview Power is a renewable energy company that develops liquid-air energy storage solutions for grid applications.

    Founded 2005London, United Kingdom$171Mlast round Nov 2025
  13. 13AmpergiaAmpergia Limited is a UK-based renewable energy company founded in 2021 by Sandip Sali.

    Ampergia Limited is a UK-based renewable energy company founded in 2021 by Sandip Sali.

    Founded 2021Milton Keynes, United Kingdom$168Mlast round Jan 2022
  14. 14First Light FusionFirst Light Fusion is a British company based in Oxfordshire, focused on developing innovative solutions for fusion energy through inertial confinement.

    First Light Fusion is a British company based in Oxfordshire, focused on developing innovative solutions for fusion energy through inertial confinement.

    Founded 2011Yarnton, United Kingdom$167Mlast round Apr 2026
  15. 15BBOXXBboxx manufactures plug and play solar systems.

    Bboxx manufactures plug and play solar systems.

    Founded 2010London, United Kingdom$167Mlast round Apr 2025
  16. 16Mytrah EnergyMytrah Energy (India) Limited (MEIL), a wholly owned subsidiary of Guernsey based and AIM/LSE listed MEL in India,

    Mytrah Energy (India) Limited (MEIL), a wholly owned subsidiary of Guernsey based and AIM/LSE listed MEL in India,

    Founded 2009Hyderabad, United Kingdom$130Mlast round Apr 2015
  17. 17Connected KerbConnected Kerb Limited is an electric vehicle (EV) infrastructure company based in London, UK, founded in 2017.

    Connected Kerb Limited is an electric vehicle (EV) infrastructure company based in London, UK, founded in 2017.

    Founded 2017London, United Kingdom$123Mlast round Jan 2025
  18. 18GMTGMT is an advertising company that provides media buying, user acquisition, retention, and marketing solutions with data-driven technology.

    GMT is an advertising company that provides media buying, user acquisition, retention, and marketing solutions with data-driven technology.

    Founded 2012United Kingdom$108Mlast round Apr 2026
  19. 19NexeonNexeon is a leading international developer and manufacturer of breakthrough silicon-based anode materials for lithium-ion batteries.

    Nexeon is a leading international developer and manufacturer of breakthrough silicon-based anode materials for lithium-ion batteries.

    Founded 2006Abingdon, United Kingdom$97Mlast round Mar 2026
  20. 20NotplaNotpla is a London-based sustainable packaging startup founded in 2014 by Rodrigo García González and Pierre Paslier.

    Notpla is a London-based sustainable packaging startup founded in 2014 by Rodrigo García González and Pierre Paslier.

    Founded 2014London, United Kingdom$89Mlast round Jul 2026
  21. 21Oxford PVOxford PV is a provider of perovskite solar cells.

    Oxford PV is a provider of perovskite solar cells.

    Founded 2010Oxford, United Kingdom$84Mlast round Jul 2019
  22. 22HubberHUBBER is an IT company that has created an online platform for trading platforms (online stores, marketplaces) and suppliers of goods.

    HUBBER is an IT company that has created an online platform for trading platforms (online stores, marketplaces) and suppliers of goods.

    Founded 2016United Kingdom$81Mlast round Aug 2025
  23. 23Corio GenerationCorio Generation is a London-based offshore wind developer, established in 2022 and part of the Macquarie Group.

    Corio Generation is a London-based offshore wind developer, established in 2022 and part of the Macquarie Group.

    Founded 2022London, United Kingdom$70Mlast round Mar 2023
  24. 24ARC RideFounded -United Kingdom$57Mlast round Sept 2026
  25. 25OLIOOlio is a Digital Agency specialising in bespoke web development and provision of web services.

    Olio is a Digital Agency specialising in bespoke web development and provision of web services.

    Founded 2008United Kingdom$54Mlast round Sept 2021
  26. 26RivanFounded 2026United Kingdom$47Mlast round Apr 2026
  27. 27BioticNRGBioticNRG is a UK-based bioenergy platform focused on converting organic waste into renewable energy through anaerobic digestion and composting.

    BioticNRG is a UK-based bioenergy platform focused on converting organic waste into renewable energy through anaerobic digestion and composting.

    Founded 2022Ipswich, United Kingdom$46Mlast round Jul 2024
  28. 28Oxford FlowOxford Flow is a British valve manufacturer and technology innovator, established in 2015 as a spin-out from the University of Oxford.

    Oxford Flow is a British valve manufacturer and technology innovator, established in 2015 as a spin-out from the University of Oxford.

    Founded 2015Witney, United Kingdom$38Mlast round Dec 2025
  29. 29Rivan IndustriesRivan Industries is a London-based startup focused on renewable energy and synthetic fuels, founded in 2024 by Harvey Hodd.

    Rivan Industries is a London-based startup focused on renewable energy and synthetic fuels, founded in 2024 by Harvey Hodd.

    Founded 2023Lewisham, United Kingdom$36Mlast round Dec 2025
  30. 30Geothermal EngineeringGeothermal Engineering is engaged in the development of deep geothermal heat and power projects.

    Geothermal Engineering is engaged in the development of deep geothermal heat and power projects.

    Founded 2008Redruth, United Kingdom$35Mlast round Aug 2025
  31. 31EO ChargingEO Charging designs smart electric vehicle chargers and intelligent software for homes, workplaces, and destinations.

    EO Charging designs smart electric vehicle chargers and intelligent software for homes, workplaces, and destinations.

    Founded 2015Stowmarket, United Kingdom$33Mlast round Nov 2025
  32. 324NewFounded 2017United Kingdom$31Mlast round Dec 2017
  33. 33Aquamarine PowerAquamarine Power is a wave energy company developing a hydro-electric wave energy converter called Oyster.

    Aquamarine Power is a wave energy company developing a hydro-electric wave energy converter called Oyster.

    Founded 2005United Kingdom$28Mlast round Sept 2011
  34. 34AltiliumFounded 2022United Kingdom$25Mlast round Apr 2026
  35. 35AnaphiteAnaphite is a technology company based in Bristol, specializing in solvent-free, dry coating precursor (DCP®) powders for lithium-ion battery manufacturing.

    Anaphite is a technology company based in Bristol, specializing in solvent-free, dry coating precursor (DCP®) powders for lithium-ion battery manufacturing.

    Founded 2018Bristol, United Kingdom$24Mlast round Apr 2026
  36. 36Open EnergiOpen Energi enables public and private sector to commercialize their energy loads, improve their energy management and support their goals.

    Open Energi enables public and private sector to commercialize their energy loads, improve their energy management and support their goals.

    Founded 1999London, United Kingdom$22Mlast round Jun 2023
  37. 37Odqa Renewable Energy TechnologiesOdqa Renewable Energy Technologies is an engineering spin-out from Oxford University, established in 2017.

    Odqa Renewable Energy Technologies is an engineering spin-out from Oxford University, established in 2017.

    Founded 2017Oxford, United Kingdom$21Mlast round Mar 2026
  38. 38RendescoRendesco's mission is to transform the heating business by creating geothermal networks using ground-source heat pump technology.

    Rendesco's mission is to transform the heating business by creating geothermal networks using ground-source heat pump technology.

    Founded 2012London, United Kingdom$21Mlast round Apr 2026
  39. 39NuadaWe help hard-to-abate industries to decarbonise by vacuuming CO2 out of flue gas

    We help hard-to-abate industries to decarbonise by vacuuming CO2 out of flue gas

    Founded 2012Newtownabbey, United Kingdom$19Mlast round Oct 2026
  40. 40Smarter Grid SolutionsSmarter Grid Solutions is a grid tech company that offers sustainable ways to help power companies meet the high demand for electricity.

    Smarter Grid Solutions is a grid tech company that offers sustainable ways to help power companies meet the high demand for electricity.

    Founded 2008Glasgow, United Kingdom$19Mlast round Oct 2021
  41. 41GridcogGridcog is a B2B SaaS energy technology company based in London, United Kingdom, founded in 2020.

    Gridcog is a B2B SaaS energy technology company based in London, United Kingdom, founded in 2020.

    Founded 2020London, United Kingdom$18Mlast round Jul 2026
  42. 42AltruistiqAltruistiq is a London-based climate technology company that offers a SaaS Sustainability Intelligence platform designed for large enterprises with complex supply chains.

    Altruistiq is a London-based climate technology company that offers a SaaS Sustainability Intelligence platform designed for large enterprises with complex supply chains.

    Founded 2020London, United Kingdom$18Mlast round Jul 2022
  43. 43Tonik EnergyTonik Energy was a UK-based renewable electricity and gas supplier founded in 2015 and headquartered in Birmingham.

    Tonik Energy was a UK-based renewable electricity and gas supplier founded in 2015 and headquartered in Birmingham.

    Founded 2015Birmingham, United Kingdom$17Mlast round Feb 2019
  44. 44Azuri TechnologiesAzuri Technologies is a renewable energy company based in Cambridge, founded in 2012.

    Azuri Technologies is a renewable energy company based in Cambridge, founded in 2012.

    Founded 2012Milton, United Kingdom$16Mlast round Sept 2025
  45. 45Eco PlasticsECO Plastics is a reprocessor of recyclable materials sourced from waste contractors and local authorities in the UK and Ireland.

    ECO Plastics is a reprocessor of recyclable materials sourced from waste contractors and local authorities in the UK and Ireland.

    Founded 2000United Kingdom$16Mlast round Jul 2008
  46. 46Founders FactoryFounders Factory builds and funds startups together with exceptional entrepreneurs and the world's leading companies.

    Founders Factory builds and funds startups together with exceptional entrepreneurs and the world's leading companies.

    Founded 2015London, United Kingdom$15Mlast round Jul 2023
  47. 47Exergy3Exergy3 is clean-tech spinout from the University of Edinburgh.

    Exergy3 is clean-tech spinout from the University of Edinburgh.

    Founded 2023Edinburgh, United Kingdom$15Mlast round Apr 2026
  48. 48Samudra OceansSamudra Oceans is a London-based climate technology startup founded in 2022, focused on advancing ocean farming and blue carbon capture.

    Samudra Oceans is a London-based climate technology startup founded in 2022, focused on advancing ocean farming and blue carbon capture.

    Founded 2022London, United Kingdom$14Mlast round Jun 2025
  49. 49PandasPandas is a B2B platform that provides quality inventory and financing to +10M local non-grocery retailers.

    Pandas is a B2B platform that provides quality inventory and financing to +10M local non-grocery retailers.

    Founded 2022London, United Kingdom$13Mlast round Mar 2023
  50. 50Spotless WaterSpotless Water is a UK-based company that operates the country's first self-service network for ultra-pure water dispensing.

    Spotless Water is a UK-based company that operates the country's first self-service network for ultra-pure water dispensing.

    Founded 2016Frimley, United Kingdom$13Mlast round Jun 2026
Total fundinghow the list is ranked
15 November 2026updated nightly
Rounds we tracksource: Millionrounds

Companies whose funding rounds we classed in this sector, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

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