# Top 50 Cleantech Startups by Funding Raised in 2026

> The 50 cleantech startups that raised in 2026 that raised the most in 2026, ranked by money raised this year: $37B combined.

Source: https://millionrounds.com/top-lists/cleantech-startups-raised-2026 (Millionrounds; every figure on the page links to its filing or article)

- 1 [**Crusoe** Crusoe is an energy-first AI infrastructure company that develops and operates large-scale, AI-optimized data centers powered by clean energy sources.](https://millionrounds.com/company/crusoe) Crusoe is an energy-first AI infrastructure company that develops and operates large-scale, AI-optimized data centers powered by clean energy sources. *Founded* 2018 Denver, United States **$7.2B** last round Sept 2026
- 2 [**Atlas Renewable Energy** Atlas Renewable Energy is a renewable energy company that develops, builds, and operates solar and wind projects.](https://millionrounds.com/company/atlas-renewable-energy) Atlas Renewable Energy is a renewable energy company that develops, builds, and operates solar and wind projects. *Founded* 2017 Miami, United States **$3.1B** last round Apr 2026
- 3 [**Stegra** Stegra operates a steel production plant to accelerate the decarbonization of the steel industry using green energy.](https://millionrounds.com/company/stegra) Stegra operates a steel production plant to accelerate the decarbonization of the steel industry using green energy. *Founded* 2020 Stockholm, Sweden **$1.6B** last round Apr 2026
- 4 [**Form Energy** Form Energy develops and commercializes a low-cost battery system that can store wind and solar energy for a long duration.](https://millionrounds.com/company/form-energy) Form Energy develops and commercializes a low-cost battery system that can store wind and solar energy for a long duration. *Founded* 2017 Somerville, United States **$1.5B** last round Sept 2026
- 5 [**Kyoto Fusioneering** Kyoto Fusioneering Ltd.](https://millionrounds.com/company/kyoto-fusioneering) Kyoto Fusioneering Ltd. *Founded* 2019 Chiyoda, Japan **$1.3B** last round Aug 2026
- 6 [**Dimension Energy**](https://millionrounds.com/company/dimension-energy) *Founded* - United States **$1.3B** last round Aug 2026
- 7 [**X-energy** X-energy is delivering the next generation of carbon-free energy by reinventing nuclear power.](https://millionrounds.com/company/x-energy) X-energy is delivering the next generation of carbon-free energy by reinventing nuclear power. *Founded* 2009 Rockville, United States **$1.0B** last round May 2026
- 8 [**Base Power**](https://millionrounds.com/company/base-power) *Founded* - United States **$1.0B** last round Aug 2026
- 9 [**Commonwealth Fusion Systems**](https://millionrounds.com/company/commonwealth-fusion-systems) *Founded* - United States **$1.0B** last round Jul 2026
- 10 [**SB Energy** SB Energy provides renewable energy at scale, accelerating the global energy transition.](https://millionrounds.com/company/sb-energy) SB Energy provides renewable energy at scale, accelerating the global energy transition. *Founded* 2015 Redwood City, United States **$1.0B** last round Jan 2026
- 11 [**Return**](https://millionrounds.com/company/return) *Founded* - Netherlands **$936M** last round Nov 2026
- 12 [**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 **$850M** last round Jul 2026
- 13 [**EnergyRe** EnergyRe is at the center of the clean energy future.](https://millionrounds.com/company/energyre) EnergyRe is at the center of the clean energy future. *Founded* 2020 New York, United States **$815M** last round Oct 2026
- 14 [**Panamint Capital** Panamint Capital is an energy investment firm that focuses on developing electric transmission and optimizing power generation.](https://millionrounds.com/company/panamint-capital) Panamint Capital is an energy investment firm that focuses on developing electric transmission and optimizing power generation. *Founded* 2019 United States **$769M** last round Nov 2026
- 15 [**Blue Energy** Blue Energy is a nuclear energy company that designs and manufactures modular nuclear power plants.](https://millionrounds.com/company/blue-energy) Blue Energy is a nuclear energy company that designs and manufactures modular nuclear power plants. *Founded* - Plainfield, United States **$760M** last round Jul 2026
- 16 [**Maxwell Power** Maxwell Power is a renewable energy company that installs solar panels.](https://millionrounds.com/company/maxwell-power) Maxwell Power is a renewable energy company that installs solar panels. *Founded* - San Diego, United States **$750M** last round Jun 2026
- 17 [**Solar Landscape** Solar Landscape is an installer and operator of solar energy systems.](https://millionrounds.com/company/solar-landscape) Solar Landscape is an installer and operator of solar energy systems. *Founded* 2012 Asbury Park, United States **$725M** last round Jun 2026
- 18 [**rPlus Energies** rPlus Energies builds new power plants to help rebuild America's energy infrastructure.](https://millionrounds.com/company/rplus-energies) rPlus Energies builds new power plants to help rebuild America's energy infrastructure. *Founded* 2018 Salt Lake City, United States **$650M** last round Mar 2026
- 19 [**ILOS Projects** ILOS Projects is a Independent Power Producer.](https://millionrounds.com/company/ilos-projects) ILOS Projects is a Independent Power Producer. *Founded* 2018 Karlsruhe, Germany **$530M** last round Apr 2026
- 20 [**Sedron Technologies** Sedron Technologies is a private environmental services company based in Sedro-Woolley, Washington, founded in 2014 as a spinoff from Janicki Industries.](https://millionrounds.com/company/sedron-technologies) Sedron Technologies is a private environmental services company based in Sedro-Woolley, Washington, founded in 2014 as a spinoff from Janicki Industries. *Founded* 2014 Sedro-Woolley, United States **$500M** last round May 2026
- 21 [**Pivot Energy** Pivot Energy is a national renewable energy provider that develops, finances, builds, owns, and manages solar and energy storage projects.](https://millionrounds.com/company/pivot-energy) Pivot Energy is a national renewable energy provider that develops, finances, builds, owns, and manages solar and energy storage projects. *Founded* 2009 Denver, United States **$500M** last round Oct 2026
- 22 [**Arevon** Arevon Energy is a renewable energy company that focuses on developing, acquiring, and managing large-scale renewable energy projects.](https://millionrounds.com/company/arevon) Arevon Energy is a renewable energy company that focuses on developing, acquiring, and managing large-scale renewable energy projects. *Founded* 2017 Scottsdale, United States **$482M** last round Mar 2026
- 23 [**Proxima Fusion** Proxima Fusion is a European fusion energy company based in Munich, Germany, founded in 2023 as the first spin-out from the Max Planck Institute for Plasma Physics.](https://millionrounds.com/company/proxima-fusion) Proxima Fusion is a European fusion energy company based in Munich, Germany, founded in 2023 as the first spin-out from the Max Planck Institute for Plasma Physics. *Founded* 2023 Munich, Germany **$468M** last round Jul 2026
- 24 [**Helion** Helion incorporated in 2009 and is now functioning as an R&D/thinktank company providing intellectual services with an emphasis on artificial intelligence, math](https://millionrounds.com/company/helion) Helion incorporated in 2009 and is now functioning as an R&D/thinktank company providing intellectual services with an emphasis on artificial intelligence, math *Founded* - Salt Lake City, UT, United States **$465M** last round Jun 2026
- 25 [**Spearmint Energy** Spearmint Energy is a merchant energy trading company founded to combine innovative financial solutions.](https://millionrounds.com/company/spearmint-energy) Spearmint Energy is a merchant energy trading company founded to combine innovative financial solutions. *Founded* 2022 Miami, United States **$450M** last round May 2026
- 26 [**Fervo Energy** Fervo Energy develops clean energy technology to generate carbon-free energy from geothermal systems.](https://millionrounds.com/company/fervo-energy) Fervo Energy develops clean energy technology to generate carbon-free energy from geothermal systems. *Founded* 2017 Houston, United States **$441M** last round Sept 2026
- 27 [**NineDot Energy** NineDot Energy develops battery storage sites and other energy solutions.](https://millionrounds.com/company/ninedot-energy) NineDot Energy develops battery storage sites and other energy solutions. *Founded* 2015 New York, United States **$431M** last round Feb 2026
- 28 [**Redwood Materials** Redwood Materials is an American company based in Carson City, Nevada, focused on creating a sustainable supply chain for lithium-ion batteries.](https://millionrounds.com/company/redwood-materials) Redwood Materials is an American company based in Carson City, Nevada, focused on creating a sustainable supply chain for lithium-ion batteries. *Founded* 2017 Carson City, United States **$425M** last round Jan 2026
- 29 [**Rezolv Energy** Rezolv Energy is an independent power producer and renewable energy developer based in Prague, Czech Republic.](https://millionrounds.com/company/rezolv-energy) Rezolv Energy is an independent power producer and renewable energy developer based in Prague, Czech Republic. *Founded* 2022 Prague, Romania **$410M** last round Nov 2026
- 30 [**Spiro**](https://millionrounds.com/company/spiro) *Founded* - Kenya **$408M** last round Sept 2026
- 31 [**Whysol Renewables** Whysol Renewables is an Italian independent power producer focused on renewable energy and energy transition projects.](https://millionrounds.com/company/whysol-renewables) Whysol Renewables is an Italian independent power producer focused on renewable energy and energy transition projects. *Founded* - Italy, United States **$368M** last round Mar 2026
- 32 [**Panthalassa** Panthalassa is a public-benefit corporation based in Portland, Oregon, founded in 2016.](https://millionrounds.com/company/panthalassa) Panthalassa is a public-benefit corporation based in Portland, Oregon, founded in 2016. *Founded* 2021 Portland, United States **$365M** last round Aug 2026
- 33 [**Radial Power** Radial Power provides distributed energy and sustainability solutions to commercial and industrial real estate asset owners.](https://millionrounds.com/company/radial-power) Radial Power provides distributed energy and sustainability solutions to commercial and industrial real estate asset owners. *Founded* 2022 Houston, United States **$355M** last round Jan 2026
- 34 [**Zelestra** At Zelestra, we are on a mission to change the world by making decarbonization a reality for our partners.](https://millionrounds.com/company/zelestra) At Zelestra, we are on a mission to change the world by making decarbonization a reality for our partners. *Founded* 2005 Spain, Spain **$350M** last round Oct 2026
- 35 [**Lunar Energy** Lunar Energy is a renewable energy company based in Mountain View, California, founded in 2020.](https://millionrounds.com/company/lunar-energy) Lunar Energy is a renewable energy company based in Mountain View, California, founded in 2020. *Founded* 2020 Mountain View, United States **$334M** last round Feb 2026
- 36 [**Newcleo** Newcleo is an atomic energy company that focuses on developing advanced nuclear energy technologies.](https://millionrounds.com/company/newcleo) Newcleo is an atomic energy company that focuses on developing advanced nuclear energy technologies. *Founded* 2021 Paris, United Kingdom **$305M** last round Sept 2026
- 37 [**Avantus** Avantus develops large-scale solar and solar-plus-storage projects to drive the adoption of zero-emission energy.](https://millionrounds.com/company/avantus) Avantus develops large-scale solar and solar-plus-storage projects to drive the adoption of zero-emission energy. *Founded* 2019 El Dorado Hills, United States **$300M** last round Sept 2026
- 38 [**EnerVenue** EnerVenue is an energy storage infrastructure company based in Fremont, California, founded in 2020.](https://millionrounds.com/company/enervenue) EnerVenue is an energy storage infrastructure company based in Fremont, California, founded in 2020. *Founded* 2020 Fremont, United States **$300M** last round Mar 2026
- 39 [**CleanCapital** CleanCapital accelerates clean energy with an online marketplace providing opportunities for investors and access to capital for developers.](https://millionrounds.com/company/cleancapital) CleanCapital accelerates clean energy with an online marketplace providing opportunities for investors and access to capital for developers. *Founded* 2015 New York, United States **$300M** last round Jan 2026
- 40 [**Neogenyx Fuels** Neogenyx Fuels develops, owns, and operates advanced biofuel and renewable natural gas infrastructure projects.](https://millionrounds.com/company/neogenyx-fuels) Neogenyx Fuels develops, owns, and operates advanced biofuel and renewable natural gas infrastructure projects. *Founded* - Framingham, United States **$300M** last round May 2026
- 41 [**GIGA Storage** GIGA Storage develops large-scale sustainable energy storage systems.](https://millionrounds.com/company/giga-storage) GIGA Storage develops large-scale sustainable energy storage systems. *Founded* 2018 Amstelveen, Netherlands **$291M** last round Oct 2026
- 42 [**Generate Capital** Generate Capital is an investment and operating platform for sustainable infrastructure.](https://millionrounds.com/company/generate-capital) Generate Capital is an investment and operating platform for sustainable infrastructure. *Founded* 2014 San Francisco, United States **$272M** last round Sept 2026
- 43 [**Fever**](https://millionrounds.com/company/fever) *Founded* - Sweden **$250M** last round Sept 2026
- 44 [**Focused Energy** Focused Energy is a German-American deep-tech startup founded in 2021, specializing in laser-driven inertial confinement fusion (ICF).](https://millionrounds.com/company/focused-energy) Focused Energy is a German-American deep-tech startup founded in 2021, specializing in laser-driven inertial confinement fusion (ICF). *Founded* 2021 Darmstadt, Germany **$240M** last round Jun 2026
- 45 [**EverWind Fuels** EverWind Fuels developing new solar and wind farms to produce green hydrogen.](https://millionrounds.com/company/everwind-fuels) EverWind Fuels developing new solar and wind farms to produce green hydrogen. *Founded* 2021 Halifax, Canada **$234M** last round Jan 2026
- 46 [**Svea Solar** Svea Solar is digitalising energy.](https://millionrounds.com/company/svea-solar) Svea Solar is digitalising energy. *Founded* - Sollentuna, Sweden **$216M** last round Jun 2026
- 47 [**Aspen Power** Aspen Power Partners is a distributed generation platform with the dual mission of accelerating and democratizing decarbonization.](https://millionrounds.com/company/aspen-power) Aspen Power Partners is a distributed generation platform with the dual mission of accelerating and democratizing decarbonization. *Founded* 2020 New York, United States **$200M** last round Jan 2026
- 48 [**Renew** ReNew is offering services on senior citizens.](https://millionrounds.com/company/renew) ReNew is offering services on senior citizens. *Founded* 2017 Toledo, United States **$195M** last round Oct 2026
- 49 [**terralayr**](https://millionrounds.com/company/terralayr) *Founded* - Switzerland **$190M** last round Jan 2026
- 50 [**Simple Energy** Simple Energy is a business consulting company that provides advice for energy generators and consumers.](https://millionrounds.com/company/simple-energy) Simple Energy is a business consulting company that provides advice for energy generators and consumers. *Founded* 2012 São Paulo, United States **$180M** last round Sept 2026

**Money raised in 2026** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies with a round in 2026 that we track, ranked by what they raised this year. Nobody pays to be on a list.

## Who backed them?

Open any company for its rounds and investors, or search the investors who back cleantech startups that raised in 2026 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 cleantech lists

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

[*C* *AR* *E* **Cleantech startups in the United States** 480 companies · $50B](https://millionrounds.com/top-lists/cleantech-startups-united-states)[*S* *C* *OE* **Cleantech startups in the United Kingdom** 156 companies · $8.9B](https://millionrounds.com/top-lists/cleantech-startups-united-kingdom)[*C* *AR* *FE* **Cleantech startups in the United States that raised in 2026** 108 companies · $31B in 2026](https://millionrounds.com/top-lists/cleantech-startups-united-states-raised-2026)[*E* *GF* *EF* **Cleantech startups in Canada** 88 companies · $2.4B](https://millionrounds.com/top-lists/cleantech-startups-canada)[*1* *N* *P* **Cleantech startups founded in 2021** 83 companies · $3.7B](https://millionrounds.com/top-lists/cleantech-startups-founded-2021)[*FF* *S* *E* **Cleantech startups founded in 2020** 76 companies · $8.3B](https://millionrounds.com/top-lists/cleantech-startups-founded-2020)[*KF* *A* *PC* **Cleantech startups founded in 2019** 70 companies · $4.5B](https://millionrounds.com/top-lists/cleantech-startups-founded-2019)[*RE* *RP* *SE* **Cleantech startups founded in 2022** 68 companies · $3.7B](https://millionrounds.com/top-lists/cleantech-startups-founded-2022)

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[*GV* *V* *RP* **Health startups worldwide** 12,811 companies · $81B](https://millionrounds.com/top-lists/health-startups)[*O* *A* *X* **AI startups worldwide** 10,238 companies · $830B](https://millionrounds.com/top-lists/ai-startups)[*GV* *V* *RP* **Biotech startups worldwide** 7,127 companies · $70B](https://millionrounds.com/top-lists/biotech-startups)[*D* *B* *FT* **Big data startups worldwide** 3,812 companies · $220B](https://millionrounds.com/top-lists/big-data-startups)[*AF* *R* *S* **Fintech startups worldwide** 3,200 companies · $94B](https://millionrounds.com/top-lists/fintech-startups)[*O* *A* *B* **AI startups that raised in 2026** 2,922 companies · $540B in 2026](https://millionrounds.com/top-lists/ai-startups-raised-2026)[*FT* *CE* *P* **Energy providers startups worldwide** 2,808 companies · $152B](https://millionrounds.com/top-lists/energy-providers-startups)[*A* *P* *O* **Marketing tech startups worldwide** 2,728 companies · $28B](https://millionrounds.com/top-lists/marketing-tech-startups)