# Top 50 Energy Startups in the United Kingdom by Funding (2026)

> The 50 best-funded energy startups in the United Kingdom, ranked by total funding raised: $15B combined.

Source: https://millionrounds.com/top-lists/energy-startups-united-kingdom (Millionrounds; every figure on the page links to its filing or article)

- 1 [**SSE**](https://millionrounds.com/company/sse) *Founded* 1998 Perth, United Kingdom **$2.7B** last round Jun 2026
- 2 [**Rolls-Royce SMR** Rolls-Royce SMR specializes in producing factory-built nuclear power plants and offers sustainable, low-cost energy solutions.](https://millionrounds.com/company/rolls-royce-smr) Rolls-Royce SMR specializes in producing factory-built nuclear power plants and offers sustainable, low-cost energy solutions. *Founded* 2021 Derby, United Kingdom **$1.2B** last round Apr 2026
- 3 [**CuspAI** CuspAI is an innovative artificial intelligence company based in Cambridge, United Kingdom, with additional teams in Amsterdam and Berlin.](https://millionrounds.com/company/cuspai) CuspAI is an innovative artificial intelligence company based in Cambridge, United Kingdom, with additional teams in Amsterdam and Berlin. *Founded* 2024 Cambridge, United Kingdom **$950M** last round Jul 2026
- 4 [**Renewable Power Capital** Renewable Power Capital is a renewable energy investment platform that focuses on energy industries.](https://millionrounds.com/company/renewable-power-capital) Renewable Power Capital is a renewable energy investment platform that focuses on energy industries. *Founded* 2020 London, United Kingdom **$915M** last round Sept 2026
- 5 [**Fidra Energy** Fidra Energy is a battery energy storage firm/business that aims to aid decarbonization for electrical system.](https://millionrounds.com/company/fidra-energy) Fidra Energy is a battery energy storage firm/business that aims to aid decarbonization for electrical system. *Founded* 2024 Edinburgh, United Kingdom **$804M** last round Sept 2025
- 6 [**Eelpower** Eelpower is a battery storage developer that operates energy storage solutions.](https://millionrounds.com/company/eelpower) Eelpower is a battery storage developer that operates energy storage solutions. *Founded* 2017 London, United Kingdom **$682M** last round Aug 2025
- 7 [**Zenobe Energy** Zenobe Energy manufactures battery storage assets for electric bus operators, utilities, and industrial and commercial businesses.](https://millionrounds.com/company/zenobe-energy) Zenobe Energy manufactures battery storage assets for electric bus operators, utilities, and industrial and commercial businesses. *Founded* 2016 London, United Kingdom **$515M** last round Jun 2026
- 8 [**Agratas** Agrata's aim is to build world-class teams and provide best-in-class technologies.](https://millionrounds.com/company/agratas) Agrata's aim is to build world-class teams and provide best-in-class technologies. *Founded* - London, United Kingdom **$509M** last round Apr 2026
- 9 [**Siccar Point Energy** Siccar Point Energy provides oil and gas exploration, development, and production.](https://millionrounds.com/company/siccar-point-energy) Siccar Point Energy provides oil and gas exploration, development, and production. *Founded* 2014 United Kingdom **$500M** last round Sept 2014
- 10 [**British Solar Renewables** British Solar Renewables specializes in planning, designing, developing and maintaining renewable projects.](https://millionrounds.com/company/british-solar-renewables) British Solar Renewables specializes in planning, designing, developing and maintaining renewable projects. *Founded* 2010 Shepton Mallet, United Kingdom **$474M** last round Jun 2025
- 11 [**Octopus Renewables Infrastructure Trust** Octopus Renewables Infrastructure Trust is a closed end investment company incorporated in England and Wales.](https://millionrounds.com/company/octopus-renewables-infrastructure-trust) Octopus Renewables Infrastructure Trust is a closed end investment company incorporated in England and Wales. *Founded* 2019 London, United Kingdom **$431M** last round Feb 2025
- 12 [**Zenobē**](https://millionrounds.com/company/zenobe) *Founded* - United Kingdom **$382M** last round Jul 2025
- 13 [**Pulse Clean Energy** Pulse Clean Energy builds and operates power stations.](https://millionrounds.com/company/pulse-clean-energy) Pulse Clean Energy builds and operates power stations. *Founded* 2022 Birmingham, United Kingdom **$364M** last round Apr 2026
- 14 [**Atrato Onsite Energy** Atrato Onsite Energy is a commercial rooftop solar funder.](https://millionrounds.com/company/atrato-onsite-energy) Atrato Onsite Energy is a commercial rooftop solar funder. *Founded* - London, United Kingdom **$327M** last round Apr 2025
- 15 [**Cero Generation** Cero Generation is a solar energy company that develops solar energy and energy storage solutions.](https://millionrounds.com/company/cero-generation) Cero Generation is a solar energy company that develops solar energy and energy storage solutions. *Founded* 2021 London, United Kingdom **$312M** last round Jul 2025
- 16 [**Statera Energy** Statera Energy is a company that generates, transmissions, and distributes electric energy.](https://millionrounds.com/company/statera-energy) Statera Energy is a company that generates, transmissions, and distributes electric energy. *Founded* 2015 London, United Kingdom **$307M** last round Nov 2025
- 17 [**Seven Energy** Seven Energy is an indigenous Nigerian oil and gas exploration, development, production and distribution company.](https://millionrounds.com/company/seven-energy) Seven Energy is an indigenous Nigerian oil and gas exploration, development, production and distribution company. *Founded* 2004 Lagos, United Kingdom **$255M** last round Apr 2014
- 18 [**Constantine Energy Storage** Constantine Energy Storage is an energy storage company that provides energy management and renewable energy services.](https://millionrounds.com/company/constantine-energy-storage) Constantine Energy Storage is an energy storage company that provides energy management and renewable energy services. *Founded* 2021 Godalming, United Kingdom **$234M** last round Mar 2025
- 19 [**AMPYR Solar Europe** AMPYR Solar Europe is an Independent electricity generator and solar development.](https://millionrounds.com/company/ampyr-solar-europe) AMPYR Solar Europe is an Independent electricity generator and solar development. *Founded* 2020 London, United Kingdom **$214M** last round Jun 2023
- 20 [**Flexion Energy** Flexion Energy is a modern utility and energy storage infrastructure specialist, which is bridging the gap between development and finance.](https://millionrounds.com/company/flexion-energy) Flexion Energy is a modern utility and energy storage infrastructure specialist, which is bridging the gap between development and finance. *Founded* 2014 London, United Kingdom **$207M** last round Jul 2021
- 21 [**EVC** EVC's core focus is on providing convenient, practical and reliable 'destination' charging options for its growing customer base](https://millionrounds.com/company/evc) EVC's core focus is on providing convenient, practical and reliable 'destination' charging options for its growing customer base *Founded* 2020 United Kingdom **$199M** last round Feb 2023
- 22 [**Pentland Floating Offshore Wind Farm** Pentland Floating Offshore Wind Farm energy infrastructure, including offshore wind, onshore wind, solar photovoltaic (PV).](https://millionrounds.com/company/pentland-floating-offshore-wind-farm) Pentland Floating Offshore Wind Farm energy infrastructure, including offshore wind, onshore wind, solar photovoltaic (PV). *Founded* 2012 Edinburgh, United Kingdom **$196M** last round Nov 2025
- 23 [**Discover Exploration** Discover Exploration is an upstream oil & gas company with E&P assets in Europe, Africa and Australasia.](https://millionrounds.com/company/discover-exploration) Discover Exploration is an upstream oil & gas company with E&P assets in Europe, Africa and Australasia. *Founded* 2012 London, United Kingdom **$184M** last round Feb 2025
- 24 [**First Light Fusion** First Light Fusion is a British company based in Oxfordshire, focused on developing innovative solutions for fusion energy through inertial confinement.](https://millionrounds.com/company/first-light-fusion) First Light Fusion is a British company based in Oxfordshire, focused on developing innovative solutions for fusion energy through inertial confinement. *Founded* 2011 Yarnton, United Kingdom **$167M** last round Apr 2026
- 25 [**BBOXX** Bboxx manufactures plug and play solar systems.](https://millionrounds.com/company/bboxx) Bboxx manufactures plug and play solar systems. *Founded* 2010 London, United Kingdom **$167M** last round Apr 2025
- 26 [**Sunsave** Sunsave Group Ltd, also known as Sunsave Energy Limited, is a London-based renewable energy technology company founded in 2022 by Alick Dru and Ben Graves.](https://millionrounds.com/company/sunsave) Sunsave Group Ltd, also known as Sunsave Energy Limited, is a London-based renewable energy technology company founded in 2022 by Alick Dru and Ben Graves. *Founded* 2022 London, United Kingdom **$166M** last round Jul 2026
- 27 [**Cornish Lithium** Cornish Lithium is a mineral exploration and development company supplying lithium raw materials for sustainable energy solutions.](https://millionrounds.com/company/cornish-lithium) Cornish Lithium is a mineral exploration and development company supplying lithium raw materials for sustainable energy solutions. *Founded* 2016 Penryn, United Kingdom **$165M** last round Mar 2026
- 28 [**Nyobolt** Nyobolt is an energy storage technology company based in Cambridge, UK, founded in 2019.](https://millionrounds.com/company/nyobolt) Nyobolt is an energy storage technology company based in Cambridge, UK, founded in 2019. *Founded* 2019 Impington, United Kingdom **$155M** last round Aug 2026
- 29 [**Enshore** Enshore is a UK based subsea trenching company, providing seabed intervention services to mega-projects across industry around the world.](https://millionrounds.com/company/enshore) Enshore is a UK based subsea trenching company, providing seabed intervention services to mega-projects across industry around the world. *Founded* 2019 Blyth, United Kingdom **$138M** last round Jan 2026
- 30 [**Breathe Battery Technologies** Breathe Battery Technologies is a developer of electric vehicle battery charging control software for automotive manufacturers.](https://millionrounds.com/company/breathe-battery-technologies) Breathe Battery Technologies is a developer of electric vehicle battery charging control software for automotive manufacturers. *Founded* 2019 United Kingdom **$132M** last round Aug 2026
- 31 [**Greener Solutions Group** Greener Solutions Group specializes in retrofit design and assessment services.](https://millionrounds.com/company/greener-solutions-group) Greener Solutions Group specializes in retrofit design and assessment services. *Founded* 2015 North Shields, United Kingdom **$131M** last round Mar 2022
- 32 [**Haventus** Haventus is an energy management firm that focuses on facilitating the energy transition and supporting economic development.](https://millionrounds.com/company/haventus) Haventus is an energy management firm that focuses on facilitating the energy transition and supporting economic development. *Founded* 2021 Ardersier, United Kingdom **$126M** last round May 2024
- 33 [**Fuse Energy** Fuse is an energy supplier that offers the UK's cheapest electricity tarif.](https://millionrounds.com/company/fuse-energy) Fuse is an energy supplier that offers the UK's cheapest electricity tarif. *Founded* 2022 London, United Kingdom **$111M** last round Jun 2026
- 34 [**Sunswap** Sunswap is a British manufacturer specializing in fully electric, battery and solar-powered transport refrigeration units.](https://millionrounds.com/company/sunswap) Sunswap is a British manufacturer specializing in fully electric, battery and solar-powered transport refrigeration units. *Founded* 2020 Leatherhead, United Kingdom **$106M** last round Apr 2026
- 35 [**Eden Sustainable** Eden Sustainable operates in finance, focusing on solar PV systems development, construction, funding, and operation.](https://millionrounds.com/company/eden-sustainable) Eden Sustainable operates in finance, focusing on solar PV systems development, construction, funding, and operation. *Founded* 2014 Exeter, United Kingdom **$95M** last round May 2025
- 36 [**FYLD** FYLD enhances productivity and safety on-site by providing real-time remote visibility and data analytics capabilities.](https://millionrounds.com/company/fyld) FYLD enhances productivity and safety on-site by providing real-time remote visibility and data analytics capabilities. *Founded* 2020 United Kingdom **$84M** last round Feb 2026
- 37 [**Echion Technologies** Echion Technologies is a leading battery technology company based in Cambridge, UK.](https://millionrounds.com/company/echion-technologies) Echion Technologies is a leading battery technology company based in Cambridge, UK. *Founded* 2017 Cambridge, United Kingdom **$84M** last round Nov 2024
- 38 [**Hive Energy** Hive Energy is one of the UK’s leading developers of solar PV energy helping people harness the power of the sun](https://millionrounds.com/company/hive-energy) Hive Energy is one of the UK’s leading developers of solar PV energy helping people harness the power of the sun *Founded* 2010 East Wellow, United Kingdom **$79M** last round Nov 2025
- 39 [**Varco Energy** Varco Energy is a battery storage asset owner and operator.](https://millionrounds.com/company/varco-energy) Varco Energy is a battery storage asset owner and operator. *Founded* 2021 London, United Kingdom **$75M** last round Sept 2023
- 40 [**Tem** Tem Energy Limited, based in London, is an innovative energy technology company founded in 2021.](https://millionrounds.com/company/tem) Tem Energy Limited, based in London, is an innovative energy technology company founded in 2021. *Founded* 2021 London, United Kingdom **$75M** last round Feb 2026
- 41 [**Faradion** It is already impressive IP portfolio is growing and, with a wide range of products available](https://millionrounds.com/company/faradion) It is already impressive IP portfolio is growing and, with a wide range of products available *Founded* 2010 Sheffield, United Kingdom **$70M** last round Jan 2022
- 42 [**Ithaca Energy** A North Sea oil and gas operator focused on the delivery of lower risk growth through the appraisal and development of UK](https://millionrounds.com/company/ithaca-energy) A North Sea oil and gas operator focused on the delivery of lower risk growth through the appraisal and development of UK *Founded* 2004 Aberdeen, United Kingdom **$66M** last round Oct 2015
- 43 [**Vision Blue Resources** Vision Blue Resources is to create a portfolio of strategic investments in clean energy-related metal and mineral resource companies.](https://millionrounds.com/company/vision-blue-resources) Vision Blue Resources is to create a portfolio of strategic investments in clean energy-related metal and mineral resource companies. *Founded* 2021 United Kingdom **$60M** last round Feb 2021
- 44 [**Eku Energy** Eku Energy is a globally diversified and technology enabled energy storage business.](https://millionrounds.com/company/eku-energy) Eku Energy is a globally diversified and technology enabled energy storage business. *Founded* 2022 London, United Kingdom **$60M** last round May 2025
- 45 [**Isembard** Isembard is a British software-first manufacturing company founded in 2024.](https://millionrounds.com/company/isembard) Isembard is a British software-first manufacturing company founded in 2024. *Founded* 2024 London, United Kingdom **$59M** last round Mar 2026
- 46 [**Thames Water** Thames Water Utilities Limited is a U.K.-based water and sewerage company that provides clean and take away waste water.](https://millionrounds.com/company/thames-water) Thames Water Utilities Limited is a U.K.-based water and sewerage company that provides clean and take away waste water. *Founded* 1989 Reading, United Kingdom **$59M** last round Mar 2024
- 47 [**ARC Ride**](https://millionrounds.com/company/arc-ride) *Founded* - United Kingdom **$57M** last round Sept 2026
- 48 [**Logan Energy** Logan Energy design, install, commission and maintain Energy Centres across the UK and Europe.](https://millionrounds.com/company/logan-energy) Logan Energy design, install, commission and maintain Energy Centres across the UK and Europe. *Founded* 1955 Edinburgh, United Kingdom **$54M** last round Feb 2026
- 49 [**Nova Innovation** Nova Innovation is an energy company that designs, builds, operates tidal energy devices, and develops sites for arrays of tidal turbines.](https://millionrounds.com/company/nova-innovation) Nova Innovation is an energy company that designs, builds, operates tidal energy devices, and develops sites for arrays of tidal turbines. *Founded* 2010 Edinburgh, United Kingdom **$51M** last round Aug 2026
- 50 [**BBOCC**](https://millionrounds.com/company/bbocc) *Founded* - United Kingdom **$50M** last round Aug 2019

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

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

## Who backed them?

Open any company for its rounds and investors, or search the investors who back energy startups in the United Kingdom in the app, with filters, lists and exports.

[Find their investors](https://millionrounds.com/login?join=1&next=/app/investors)[All top lists](https://millionrounds.com/top-lists)

## More energy lists

[See all](https://millionrounds.com/top-lists?t=Energy)

[*CE* *C* *SE* **Energy startups worldwide** 1,800 companies · $129B](https://millionrounds.com/top-lists/energy-startups)[*CE* *C* *SE* **Energy startups in the United States** 741 companies · $110B](https://millionrounds.com/top-lists/energy-startups-united-states)[*N* *V* *S* **Energy startups in Europe** 607 companies · $39B](https://millionrounds.com/top-lists/energy-startups-europe)[*C* *ME* *W* **Energy startups that raised in 2026** 429 companies · $73B in 2026](https://millionrounds.com/top-lists/energy-startups-raised-2026)[*C* *ME* *W* **Energy startups in the United States that raised in 2026** 194 companies · $63B in 2026](https://millionrounds.com/top-lists/energy-startups-united-states-raised-2026)[*AE* *TE* *RS* **Energy startups founded in 2021** 111 companies · $8.5B](https://millionrounds.com/top-lists/energy-startups-founded-2021)[*V* *UC* *E* **Energy startups founded in 2020** 105 companies · $15B](https://millionrounds.com/top-lists/energy-startups-founded-2020)[*AP* *CP* *CM* **Energy startups in Canada** 103 companies · $6.1B](https://millionrounds.com/top-lists/energy-startups-canada)

## More lists for United Kingdom

[See all](https://millionrounds.com/top-lists?r=United%20Kingdom)

[*SC* *N* *F* **Startups in the United Kingdom** 8,355 companies · $79B](https://millionrounds.com/top-lists/startups-united-kingdom)[*IL* *CS* *ON* **Health startups in the United Kingdom** 1,094 companies · $17B](https://millionrounds.com/top-lists/health-startups-united-kingdom)[*N* *AA* *IL* **AI startups in the United Kingdom** 835 companies · $32B](https://millionrounds.com/top-lists/ai-startups-united-kingdom)[*C* *T* *K* **IT Services startups in the United Kingdom** 816 companies · $5.3B](https://millionrounds.com/top-lists/it-services-startups-united-kingdom)[*IL* *CS* *ON* **Healthcare startups in the United Kingdom** 608 companies · $14B](https://millionrounds.com/top-lists/healthcare-startups-united-kingdom)[*IL* *CS* *ON* **Biotech startups in the United Kingdom** 588 companies · $15B](https://millionrounds.com/top-lists/biotech-startups-united-kingdom)[*F* *FC* *R* **Financial Services startups in the United Kingdom** 472 companies · $26B](https://millionrounds.com/top-lists/financial-services-startups-united-kingdom)[*FC* *R* *C* **Fintech startups in the United Kingdom** 342 companies · $23B](https://millionrounds.com/top-lists/fintech-startups-united-kingdom)