# Top 50 Energy Startups Founded in 2021 by Funding (2026)

> The 50 best-funded energy startups founded in 2021, ranked by total funding raised: $8.5B combined. With founding year, headquarters and each company's rounds.

Source: https://millionrounds.com/top-lists/energy-startups-founded-2021 (Millionrounds; every figure on the page links to its filing or article)

- 1 [**Akaysha Energy** Akaysha Energy offers full-cycle development for projects including Battery Energy Storage Systems (BESS) and renewable energy.](https://millionrounds.com/company/akaysha-energy) Akaysha Energy offers full-cycle development for projects including Battery Energy Storage Systems (BESS) and renewable energy. *Founded* 2021 Melbourne, Australia **$1.5B** last round Oct 2026
- 2 [**Technip Energies** Technip Energies is a engineering & technology company for the energy transition.](https://millionrounds.com/company/technip-energies) Technip Energies is a engineering & technology company for the energy transition. *Founded* 2021 Nanterre, France **$1.4B** last round Jun 2026
- 3 [**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
- 4 [**1KOMMA5°** 1Komma5° is an electricity company offering free electricity to all electric vehicle owners financed through trading using GHG quotas.](https://millionrounds.com/company/1komma5) 1Komma5° is an electricity company offering free electricity to all electric vehicle owners financed through trading using GHG quotas. *Founded* 2021 Hamburg, Germany **$563M** last round Oct 2026
- 5 [**HEQ Deepwater** HEQ Deepwater is an energy company that focused on the acquisition of the deepwater gulf.](https://millionrounds.com/company/heq-deepwater) HEQ Deepwater is an energy company that focused on the acquisition of the deepwater gulf. *Founded* 2021 Houston, United States **$400M** last round Aug 2021
- 6 [**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
- 7 [**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
- 8 [**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 **$280M** last round Jun 2026
- 9 [**Ambient Fuels** Ambient Fuels is a green energy developer that delivers green hydrogen solutions.](https://millionrounds.com/company/ambient-fuels) Ambient Fuels is a green energy developer that delivers green hydrogen solutions. *Founded* 2021 New York, United States **$250M** last round May 2023
- 10 [**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
- 11 [**Terra One** Terra One engages in the development and operation of large-scale battery storage systems.](https://millionrounds.com/company/terra-one) Terra One engages in the development and operation of large-scale battery storage systems. *Founded* 2021 Berlin, Germany **$185M** last round Sept 2025
- 12 [**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
- 13 [**Koloma** Koloma is a geologic hydrogen company that leverages technology and data to identify and commercialize geologic hydrogen resources.](https://millionrounds.com/company/koloma) Koloma is a geologic hydrogen company that leverages technology and data to identify and commercialize geologic hydrogen resources. *Founded* 2021 Denver, United States **$111M** last round Oct 2026
- 14 [**Xcimer Energy** Xcimer Energy is an inertial fusion company offering laser-driven fusion to provide cheap, abundant, and carbon-free energy.](https://millionrounds.com/company/xcimer-energy) Xcimer Energy is an inertial fusion company offering laser-driven fusion to provide cheap, abundant, and carbon-free energy. *Founded* 2021 United States **$100M** last round Sept 2026
- 15 [**Factorial Energy** Factorial Energy focuses on sustainable future with safe, high performance batteries for EVs, homes, and critical applications.](https://millionrounds.com/company/factorial-energy) Factorial Energy focuses on sustainable future with safe, high performance batteries for EVs, homes, and critical applications. *Founded* 2021 Woburn, United States **$100M** last round Jun 2026
- 16 [**Radiance Renewables** Radiance Renewables is one of India’s fastest-growing renewable energy solution providers.](https://millionrounds.com/company/radiance-renewables) Radiance Renewables is one of India’s fastest-growing renewable energy solution providers. *Founded* 2021 Mumbai **$100M** last round Feb 2026
- 17 [**Reflect Orbital** Reflect Orbital is an American space technology company founded in 2021 and based in Hawthorne, California.](https://millionrounds.com/company/reflect-orbital) Reflect Orbital is an American space technology company founded in 2021 and based in Hawthorne, California. *Founded* 2021 Los Angeles, United States **$94M** last round Nov 2026
- 18 [**Mitra Chem** Mitra Chem is an AI-native manufacturer of lithium-ion battery materials, founded in 2021 and headquartered in Mountain View, California.](https://millionrounds.com/company/mitra-chem) Mitra Chem is an AI-native manufacturer of lithium-ion battery materials, founded in 2021 and headquartered in Mountain View, California. *Founded* 2021 Mountain View, United States **$91M** last round Jun 2025
- 19 [**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
- 20 [**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
- 21 [**Ionic Blue** Ionic Blue's collaborative initiatives enable IonicBlue customers to pursue responsible environmental sustainability solutions.](https://millionrounds.com/company/ionic-blue) Ionic Blue's collaborative initiatives enable IonicBlue customers to pursue responsible environmental sustainability solutions. *Founded* 2021 East Rutherford, United States **$74M** last round May 2023
- 22 [**Logivolt** Logivolt is a financing solution for collective infrastructure for charging electric vehicles](https://millionrounds.com/company/logivolt) Logivolt is a financing solution for collective infrastructure for charging electric vehicles *Founded* 2021 Paris, France **$74M** last round Dec 2022
- 23 [**Rega Energy** REGA ENERGY is a Portuguese renewable energy company established in 2021, focused on developing, financing, building, owning, and operating biomethane and green](https://millionrounds.com/company/rega-energy) REGA ENERGY is a Portuguese renewable energy company established in 2021, focused on developing, financing, building, owning, and operating biomethane and green *Founded* 2021 Lisbon, Portugal **$67M** last round Jul 2023
- 24 [**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
- 25 [**Energy Singularity** Energy Singularity is a fusion energy company based in Shanghai, founded in 2021.](https://millionrounds.com/company/energy-singularity) Energy Singularity is a fusion energy company based in Shanghai, founded in 2021. *Founded* 2021 Shanghai, China **$58M** last round Apr 2023
- 26 [**Rabot Energy** Rabot Energy is a smart energy and electricity provider based in Hamburg, founded in 2021.](https://millionrounds.com/company/rabot-energy) Rabot Energy is a smart energy and electricity provider based in Hamburg, founded in 2021. *Founded* 2021 Hamburg, Germany **$50M** last round Oct 2026
- 27 [**JIMMY** Jimmy Energy is a French industrial startup founded in 2020, focused on designing and operating thermal generators powered by 4th-generation high-temperature mi](https://millionrounds.com/company/jimmy) Jimmy Energy is a French industrial startup founded in 2020, focused on designing and operating thermal generators powered by 4th-generation high-temperature mi *Founded* 2021 Paris, France **$49M** last round Mar 2026
- 28 [**Calogena** Calogena is a French technology company founded in 2021, specializing in the design and deployment of Small Modular Reactors (SMRs) for urban district heating.](https://millionrounds.com/company/calogena) Calogena is a French technology company founded in 2021, specializing in the design and deployment of Small Modular Reactors (SMRs) for urban district heating. *Founded* 2021 Aix-en-Provence, France **$45M** last round Nov 2026
- 29 [**Fleetzero** Fleetzero is building battery electric cargo ships to affordably decarbonize ocean freight.](https://millionrounds.com/company/fleetzero) Fleetzero is building battery electric cargo ships to affordably decarbonize ocean freight. *Founded* 2021 Auburn, United States **$43M** last round Jan 2026
- 30 [**Helical Fusion** Helical Fusion Co., Ltd.](https://millionrounds.com/company/helical-fusion) Helical Fusion Co., Ltd. *Founded* 2021 Chuo City, Japan **$43M** last round Oct 2026
- 31 [**Fourth Power** Fourth Power is an innovative energy technology company based in Cambridge, Massachusetts.](https://millionrounds.com/company/fourth-power) Fourth Power is an innovative energy technology company based in Cambridge, Massachusetts. *Founded* 2021 Cambridge, United States **$39M** last round Sept 2025
- 32 [**Solidion Technology** Solidion Technology is a battery technology company that manufactures battery materials, components, and next-generation batteries.](https://millionrounds.com/company/solidion-technology) Solidion Technology is a battery technology company that manufactures battery materials, components, and next-generation batteries. *Founded* 2021 Dallas, United States **$35M** last round Jun 2026
- 33 [**ENODA** ENODA provides the transition to a zero-carbon energy system in a way that is economically sustainable for all.](https://millionrounds.com/company/enoda) ENODA provides the transition to a zero-carbon energy system in a way that is economically sustainable for all. *Founded* 2021 United Kingdom **$32M** last round Feb 2025
- 34 [**Adden Energy** Adden Energy is a Harvard University spinout based in Waltham, Massachusetts, founded in 2021.](https://millionrounds.com/company/adden-energy) Adden Energy is a Harvard University spinout based in Waltham, Massachusetts, founded in 2021. *Founded* 2021 Waltham, United States **$32M** last round Oct 2026
- 35 [**ETZ** ETZ is a pioneer in the field of net zero energy transition and a net exporter of goods, services, technology, and expertise.](https://millionrounds.com/company/etz) ETZ is a pioneer in the field of net zero energy transition and a net exporter of goods, services, technology, and expertise. *Founded* 2021 Aberdeen, United Kingdom **$23M** last round Oct 2025
- 36 [**Emvolon** Emvolon is a technology company that converts wasted resources into low-cost green fuels](https://millionrounds.com/company/emvolon) Emvolon is a technology company that converts wasted resources into low-cost green fuels *Founded* 2021 Boston, United States **$22M** last round Oct 2026
- 37 [**Coast Energy** Coast Energy is a commercial and industrial solar energy firm based in El Segundo, California.](https://millionrounds.com/company/coast-energy) Coast Energy is a commercial and industrial solar energy firm based in El Segundo, California. *Founded* 2021 El Segundo, United States **$21M** last round May 2025
- 38 [**NovoHydrogen** NovoHydrogen is experienced at deploying and commercializing successful innovative energy transition technologies.](https://millionrounds.com/company/novohydrogen) NovoHydrogen is experienced at deploying and commercializing successful innovative energy transition technologies. *Founded* 2021 United States **$20M** last round Oct 2023
- 39 [**Bradford Energy** Bradford Energy offers an air source heat pump heat network.](https://millionrounds.com/company/bradford-energy) Bradford Energy offers an air source heat pump heat network. *Founded* 2021 London, United Kingdom **$20M** last round May 2023
- 40 [**Euclid Power** Euclid Power is a New York-based company founded in 2021 that specializes in renewable energy software and services.](https://millionrounds.com/company/euclid-power) Euclid Power is a New York-based company founded in 2021 that specializes in renewable energy software and services. *Founded* 2021 New York, United States **$20M** last round Sept 2025
- 41 [**Voltfang** Voltfang develops home storage solutions for private houses using recycled traction batteries.](https://millionrounds.com/company/voltfang) Voltfang develops home storage solutions for private houses using recycled traction batteries. *Founded* 2021 Aachen, Germany **$17M** last round Jun 2025
- 42 [**Dodai** Dodai is an Ethiopian electric motorcycle manufacturer based in Addis Ababa, founded by Japanese entrepreneur Yuma Sasaki.](https://millionrounds.com/company/dodai) Dodai is an Ethiopian electric motorcycle manufacturer based in Addis Ababa, founded by Japanese entrepreneur Yuma Sasaki. *Founded* 2021 Addis Ababa, Ethiopia **$17M** last round May 2026
- 43 [**Quantum Commodity Intelligence** Quantum Commodity Intelligence (QCI) is an independent Price Reporting Agency (PRA) focused on providing market intelligence for the energy transition and carbon markets.](https://millionrounds.com/company/quantum-commodity-intelligence) Quantum Commodity Intelligence (QCI) is an independent Price Reporting Agency (PRA) focused on providing market intelligence for the energy transition and carbon markets. *Founded* 2021 London, United Kingdom **$17M** last round Jul 2024
- 44 [**R3 Robotics** R3 Robotics is an AI-powered robotics company based in Luxembourg, specializing in the automated industrial disassembly of electric vehicle (EV) systems.](https://millionrounds.com/company/r3-robotics) R3 Robotics is an AI-powered robotics company based in Luxembourg, specializing in the automated industrial disassembly of electric vehicle (EV) systems. *Founded* 2021 Luxembourg City, Luxembourg **$17M** last round Feb 2026
- 45 [**Johnson Energy Storage** Johnson Energy Storage produces lithium-ion battery intended for use in electronics requiring reliable power and power storage.](https://millionrounds.com/company/johnson-energy-storage) Johnson Energy Storage produces lithium-ion battery intended for use in electronics requiring reliable power and power storage. *Founded* 2021 Atlanta, United States **$16M** last round Oct 2024
- 46 [**Guorui Xiechuang** Guorui Xiechuang is a high-tech enterprise that provides power + energy storage products and solutions for global customers.](https://millionrounds.com/company/guorui-xiechuang) Guorui Xiechuang is a high-tech enterprise that provides power + energy storage products and solutions for global customers. *Founded* 2021 Shenzhen **$14M** last round May 2023
- 47 [**Jiamai shares** Jiamai is a new energy pneumatic component manufacturer.](https://millionrounds.com/company/jiamai-shares) Jiamai is a new energy pneumatic component manufacturer. *Founded* 2021 Longgang **$14M** last round Feb 2025
- 48 [**Green Fusion** Green Fusion develops a simple and secure software solution for more efficient control of your energy system.](https://millionrounds.com/company/green-fusion) Green Fusion develops a simple and secure software solution for more efficient control of your energy system. *Founded* 2021 Berlin, Germany **$13M** last round Jan 2025
- 49 [**Splight** Splight is an AI-driven grid technology company founded in 2021, headquartered in San Mateo, California, with additional offices in Austin, Santiago, and Spain.](https://millionrounds.com/company/splight) Splight is an AI-driven grid technology company founded in 2021, headquartered in San Mateo, California, with additional offices in Austin, Santiago, and Spain. *Founded* 2021 San Francisco, United States **$12M** last round Aug 2025
- 50 [**Equatic** Equatic uses a seawater electrolysis process that enhances the ocean's capacity to absorb and store large quantities of carbon dioxide.](https://millionrounds.com/company/equatic) Equatic uses a seawater electrolysis process that enhances the ocean's capacity to absorb and store large quantities of carbon dioxide. *Founded* 2021 Torrance, United States **$12M** last round Aug 2025

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies founded in 2021 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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