# Top 50 Cleantech Startups in the United States by Funding (2026)

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

Source: https://millionrounds.com/top-lists/cleantech-startups-united-states (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 **$9.9B** 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 [**EVgo** EVgo provides fast charging networks for private and public electric vehicles.](https://millionrounds.com/company/evgo) EVgo provides fast charging networks for private and public electric vehicles. *Founded* 2010 Los Angeles, United States **$2.5B** last round Jul 2025
- 4 [**Base Power**](https://millionrounds.com/company/base-power) *Founded* - United States **$2.2B** last round Aug 2026
- 5 [**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 **$2.0B** last round Sept 2026
- 6 [**Commonwealth Fusion Systems**](https://millionrounds.com/company/commonwealth-fusion-systems) *Founded* - United States **$1.9B** last round Jul 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 **$1.5B** last round May 2026
- 8 [**Dimension Energy**](https://millionrounds.com/company/dimension-energy) *Founded* - United States **$1.5B** last round Aug 2026
- 9 [**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 **$1.3B** last round Sept 2026
- 10 [**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 **$1.2B** last round Jan 2026
- 11 [**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 **$1.2B** last round Oct 2026
- 12 [**CleanSpark** CleanSpark (Nasdaq: CLSK) is America's Bitcoin MinerTM.](https://millionrounds.com/company/cleanspark) CleanSpark (Nasdaq: CLSK) is America's Bitcoin MinerTM. *Founded* 2014 Henderson, United States **$1.1B** last round Nov 2025
- 13 [**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 **$1.1B** last round Sept 2026
- 14 [**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
- 15 [**The Appalachian Regional Clean Hydrogen Hub** ARCH2's mission is to provide an interconnected, full value chain H2Hub solution.](https://millionrounds.com/company/the-appalachian-regional-clean-hydrogen-hub) ARCH2's mission is to provide an interconnected, full value chain H2Hub solution. *Founded* - Morgantown, United States **$925M** last round Jul 2024
- 16 [**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 **$900M** last round Jun 2026
- 17 [**Pacific Fusion** Pacific Fusion was founded in 2023 to deliver commercial fusion energy to power cities, businesses and homes.](https://millionrounds.com/company/pacific-fusion) Pacific Fusion was founded in 2023 to deliver commercial fusion energy to power cities, businesses and homes. *Founded* 1997 Fremont, United States **$900M** last round Nov 2024
- 18 [**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 **$805M** last round Jul 2026
- 19 [**Intersect Power**](https://millionrounds.com/company/intersect-power) *Founded* - United States **$800M** last round Dec 2024
- 20 [**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 **$800M** last round Sept 2026
- 21 [**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
- 22 [**XPLR Infrastructure** XPLR Infrastructure is a renewable energy company that owns, operates, and acquires contracted clean energy projects.](https://millionrounds.com/company/xplr-infrastructure) XPLR Infrastructure is a renewable energy company that owns, operates, and acquires contracted clean energy projects. *Founded* - North Palm Beach, United States **$750M** last round Nov 2025
- 23 [**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
- 24 [**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 **$660M** last round Jan 2026
- 25 [**Origis Energy** Origis Energy focuses on the development, construction, and operation of solar power plants and energy storage solutions.](https://millionrounds.com/company/origis-energy) Origis Energy focuses on the development, construction, and operation of solar power plants and energy storage solutions. *Founded* 2008 Miami, United States **$651M** last round Jan 2025
- 26 [**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
- 27 [**WildFire Energy** Wildfire Energy is an Australian cleantech startup focused on converting residual waste into renewable energy, hydrogen, and sustainable fuels using its proprie](https://millionrounds.com/company/wildfire-energy) Wildfire Energy is an Australian cleantech startup focused on converting residual waste into renewable energy, hydrogen, and sustainable fuels using its proprie *Founded* 2016 Petrie Terrace, United States **$604M** last round Jul 2026
- 28 [**Abound Solar** Abound Solar was a thin-film solar module manufacturer based in Loveland, Colorado.](https://millionrounds.com/company/abound-solar) Abound Solar was a thin-film solar module manufacturer based in Loveland, Colorado. *Founded* 2007 Loveland, United States **$510M** last round Dec 2010
- 29 [**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
- 30 [**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
- 31 [**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
- 32 [**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
- 33 [**SoloPower** SoloPower is a producer of thin-film photovoltaic cells and modules that help solar electricity generation.](https://millionrounds.com/company/solopower) SoloPower is a producer of thin-film photovoltaic cells and modules that help solar electricity generation. *Founded* 2005 Portland, United States **$458M** last round Oct 2012
- 34 [**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
- 35 [**Helion Energy** Helion Energy is a fusion power company developing the world's first fusion generators, enabling a future with unlimited clean energy.](https://millionrounds.com/company/helion-energy) Helion Energy is a fusion power company developing the world's first fusion generators, enabling a future with unlimited clean energy. *Founded* 2013 Everett, United States **$437M** last round Jan 2025
- 36 [**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
- 37 [**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
- 38 [**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
- 39 [**Agilitas Energy** Agilitas Energy is a fully integrated developer, builder, owner, and operator of distributed solar and energy-storage systems.](https://millionrounds.com/company/agilitas-energy) Agilitas Energy is a fully integrated developer, builder, owner, and operator of distributed solar and energy-storage systems. *Founded* 2014 Wakefield, United States **$350M** last round Jun 2022
- 40 [**Estuary Power** Estuary Power develops, sponsors, and finances energy projects.](https://millionrounds.com/company/estuary-power) Estuary Power develops, sponsors, and finances energy projects. *Founded* 2013 Reno, United States **$340M** last round Dec 2024
- 41 [**Ara Partners** Ara Partners is an oppertunistic private equity investment platform.](https://millionrounds.com/company/ara-partners) Ara Partners is an oppertunistic private equity investment platform. *Founded* 2017 Houston, United States **$335M** last round Sept 2024
- 42 [**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
- 43 [**PosiGen** PosiGen is on a mission to make solar affordable and easy to access for homeowners.](https://millionrounds.com/company/posigen) PosiGen is on a mission to make solar affordable and easy to access for homeowners. *Founded* 2011 St. Rose, United States **$320M** last round Dec 2024
- 44 [**Peregrine Energy** Peregrine Energy is a manufacturing company that specializes in the acquisition, development, and operations of renewable assets.](https://millionrounds.com/company/peregrine-energy) Peregrine Energy is a manufacturing company that specializes in the acquisition, development, and operations of renewable assets. *Founded* 2022 Boulder, United States **$317M** last round Nov 2025
- 45 [**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 **$312M** last round Mar 2026
- 46 [**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 **$304M** last round Jan 2026
- 47 [**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
- 48 [**Carrier Energy Partners** Carrier Energy Partners is a private oil and gas company focused on the acquisition and exploitation of upstream assets.](https://millionrounds.com/company/carrier-energy-partners) Carrier Energy Partners is a private oil and gas company focused on the acquisition and exploitation of upstream assets. *Founded* 2013 United States **$300M** last round Oct 2013
- 49 [**Strata Clean Energy** Strata Clean Energy is a solar storage developer.](https://millionrounds.com/company/strata-clean-energy) Strata Clean Energy is a solar storage developer. *Founded* 2008 Durham, United States **$300M** last round Nov 2023
- 50 [**Scale Microgrids** Scale Microgrids is a distributed clean energy and microgrid platform.](https://millionrounds.com/company/scale-microgrids) Scale Microgrids is a distributed clean energy and microgrid platform. *Founded* 2016 Ridgewood, United States **$279M** last round Jun 2026

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: 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.

## Who backed them?

Open any company for its rounds and investors, or search the investors who back cleantech startups in the United States 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* *S* **Cleantech startups that raised in 2026** 276 companies · $37B in 2026](https://millionrounds.com/top-lists/cleantech-startups-raised-2026)[*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)

## More lists for United States

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

[*O* *A* *X* **Startups in the United States** 42,176 companies · $870B](https://millionrounds.com/top-lists/startups-united-states)[*GV* *V* *RP* **Health startups in the United States** 7,411 companies · $71B](https://millionrounds.com/top-lists/health-startups-united-states)[*O* *A* *X* **AI startups in the United States** 5,656 companies · $718B](https://millionrounds.com/top-lists/ai-startups-united-states)[*V* *RP* *DH* **Healthcare startups in the United States** 4,148 companies · $51B](https://millionrounds.com/top-lists/healthcare-startups-united-states)[*S* *P* *I* **IT Services startups in the United States** 3,482 companies · $27B](https://millionrounds.com/top-lists/it-services-startups-united-states)[*D* *CE* *AD* **Big Data & Analytics startups in the United States** 2,107 companies · $132B](https://millionrounds.com/top-lists/big-data-startups-united-states)[*O* *A* *W* **AI startups in the United States that raised in 2026** 1,648 companies · $431B in 2026](https://millionrounds.com/top-lists/ai-startups-united-states-raised-2026)[*D* *P* *A* **Software startups in the United States** 1,638 companies · $77B](https://millionrounds.com/top-lists/software-startups-united-states)