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

> The 50 cleantech startups in the United States that raised in 2026 that raised the most in 2026, ranked by money raised this year: $31B combined.

Source: https://millionrounds.com/top-lists/cleantech-startups-united-states-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 [**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
- 4 [**Dimension Energy**](https://millionrounds.com/company/dimension-energy) *Founded* - United States **$1.3B** last round Aug 2026
- 5 [**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
- 6 [**Base Power**](https://millionrounds.com/company/base-power) *Founded* - United States **$1.0B** last round Aug 2026
- 7 [**Commonwealth Fusion Systems**](https://millionrounds.com/company/commonwealth-fusion-systems) *Founded* - United States **$1.0B** last round Jul 2026
- 8 [**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
- 9 [**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
- 10 [**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
- 11 [**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
- 12 [**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
- 13 [**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
- 14 [**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
- 15 [**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
- 16 [**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
- 17 [**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
- 18 [**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
- 19 [**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
- 20 [**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
- 21 [**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
- 22 [**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
- 23 [**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
- 24 [**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
- 25 [**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
- 26 [**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
- 27 [**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
- 28 [**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
- 29 [**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
- 30 [**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
- 31 [**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
- 32 [**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
- 33 [**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
- 34 [**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
- 35 [**Nexamp** Nexamp provides renewable energy services designed to minimize energy expenses and carbon emissions.](https://millionrounds.com/company/nexamp) Nexamp provides renewable energy services designed to minimize energy expenses and carbon emissions. *Founded* 2007 Boston, United States **$180M** last round Apr 2026
- 36 [**Quaise Energy** Quaise Energy is a technology company founded in 2018, originating from the MIT Plasma Science and Fusion Center.](https://millionrounds.com/company/quaise-energy) Quaise Energy is a technology company founded in 2018, originating from the MIT Plasma Science and Fusion Center. *Founded* 2018 Houston, United States **$159M** last round Sept 2026
- 37 [**Pathway Power** Pathway Power is a utility-scale solar and battery storage developer building a renewable energy value chain.](https://millionrounds.com/company/pathway-power) Pathway Power is a utility-scale solar and battery storage developer building a renewable energy value chain. *Founded* 2022 San Diego, United States **$150M** last round Jun 2026
- 38 [**Terawatt Infrastructure** TeraWatt Infrastructure operates an electric vehicle charging infrastructure for medium and heavy-duty transport and fleets.](https://millionrounds.com/company/terawatt-infrastructure) TeraWatt Infrastructure operates an electric vehicle charging infrastructure for medium and heavy-duty transport and fleets. *Founded* 2018 San Francisco, United States **$150M** last round Jun 2026
- 39 [**Mazama Energy** Mazama Energy is a geothermal developer founded in March 2023 and based in Frisco, Texas, with a corporate office in Plano.](https://millionrounds.com/company/mazama-energy) Mazama Energy is a geothermal developer founded in March 2023 and based in Frisco, Texas, with a corporate office in Plano. *Founded* 2023 Frisco, United States **$135M** last round Sept 2026
- 40 [**OCI Energy** OCI Energy develops solar and battery projects and provides EPC, O&M, and PPA support for commercial and utility clients](https://millionrounds.com/company/oci-energy) OCI Energy develops solar and battery projects and provides EPC, O&M, and PPA support for commercial and utility clients *Founded* 2011 San Antonio, United States **$130M** last round Jun 2026
- 41 [**TAR** Transformative American Resources (TAR) is an American energy infrastructure company.](https://millionrounds.com/company/tar) Transformative American Resources (TAR) is an American energy infrastructure company. *Founded* - Austin, United States **$120M** last round Sept 2026
- 42 [**Peak Energy** Peak Energy is a charging application for electric vehicles.](https://millionrounds.com/company/peak-energy) Peak Energy is a charging application for electric vehicles. *Founded* 2022 United States **$108M** last round Oct 2026
- 43 [**Rainmaker** Rainmaker is a New York-based crypto and DeFi company that specializes in a mobile-first, account-abstraction wallet.](https://millionrounds.com/company/rainmaker) Rainmaker is a New York-based crypto and DeFi company that specializes in a mobile-first, account-abstraction wallet. *Founded* 2022 New York, United States **$100M** last round Sept 2026
- 44 [**Orange EV** Orange EV manufactures and sells heavy-duty industrial electric vehicles.](https://millionrounds.com/company/orange-ev) Orange EV manufactures and sells heavy-duty industrial electric vehicles. *Founded* 2012 Kansas City, United States **$100M** last round Aug 2026
- 45 [**Type One Energy** Stellarator technology to transform energy markets with fusion power.](https://millionrounds.com/company/type-one-energy) Stellarator technology to transform energy markets with fusion power. *Founded* 2019 Knoxville, United States **$88M** last round Sept 2026
- 46 [**CleanChoice Energy** CleanChoice Energy is a clean energy supplier whose mission is to make 100% renewable energy available to everyone.](https://millionrounds.com/company/cleanchoice-energy) CleanChoice Energy is a clean energy supplier whose mission is to make 100% renewable energy available to everyone. *Founded* 2011 Washington, United States **$85M** last round Oct 2026
- 47 [**Deep Fission** Deep Fission is transforming the energy landscape by installing modular nuclear power reactors a mile deep.](https://millionrounds.com/company/deep-fission) Deep Fission is transforming the energy landscape by installing modular nuclear power reactors a mile deep. *Founded* - Berkeley, United States **$80M** last round Feb 2026
- 48 [**Artemis** Artemis operates an intelligence platform for indoor farms.](https://millionrounds.com/company/artemis) Artemis operates an intelligence platform for indoor farms. *Founded* 2015 United States **$77M** last round Aug 2026
- 49 [**Bluecore Energy** Bluecore Energy designs and builds compact, zero-emission small modular nuclear reactors on floating barges.](https://millionrounds.com/company/bluecore-energy) Bluecore Energy designs and builds compact, zero-emission small modular nuclear reactors on floating barges. *Founded* - Long Beach, United States **$69M** last round Sept 2026
- 50 [**LanzaJet** LanzaJet is a private company founded in 2020 that focuses on sustainable fuels technology.](https://millionrounds.com/company/lanzajet) LanzaJet is a private company founded in 2020 that focuses on sustainable fuels technology. *Founded* 2020 Chicago, United States **$67M** last round Oct 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 in the United States that raised in 2026 in the app, with filters, lists and exports.

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## More cleantech lists

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