# Top 50 Energy Efficiency Startups Worldwide by Funding (2026)

> The 50 best-funded energy efficiency startups worldwide, ranked by total funding raised: $5.1B combined.

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

- 1 [**COX Group** COX Group provides solutions for development and management of water resources as well as services for energy generation and transmission.](https://millionrounds.com/company/cox-group) COX Group provides solutions for development and management of water resources as well as services for energy generation and transmission. *Founded* - Seville, Spain **$2.6B** last round Jan 2026
- 2 [**Unconventional AI** Unconventional AI rethinks computer foundations to optimize energy efficiency for AI.](https://millionrounds.com/company/unconventional-ai) Unconventional AI rethinks computer foundations to optimize energy efficiency for AI. *Founded* - San Francisco, United States **$475M** last round Dec 2025
- 3 [**Presidio Petroleum** Presidio Petroleum is a leading oil and gas efficiency company.](https://millionrounds.com/company/presidio-petroleum) Presidio Petroleum is a leading oil and gas efficiency company. *Founded* 2016 Fort Worth, United States **$350M** last round Jun 2026
- 4 [**Grenergy** Grenergy specializes in research and development and sales of energy-saving power management chips.](https://millionrounds.com/company/grenergy) Grenergy specializes in research and development and sales of energy-saving power management chips. *Founded* 2016 Nanjing **$345M** last round Jul 2024
- 5 [**Counterpointe Sustainable Real Estate** CSRE is leading the way in financing energy efficiency, renewables seismic strengthening, storm protection for commercial real estate.](https://millionrounds.com/company/counterpointe-sustainable-real-estate) CSRE is leading the way in financing energy efficiency, renewables seismic strengthening, storm protection for commercial real estate. *Founded* 2015 Stamford, United States **$256M** last round Jul 2023
- 6 [**Plus Power** Plus Power specializes in creating battery energy storage systems that enhance the efficiency and reliability of the electrical grid.](https://millionrounds.com/company/plus-power) Plus Power specializes in creating battery energy storage systems that enhance the efficiency and reliability of the electrical grid. *Founded* 2018 Houston, United States **$160M** last round Nov 2025
- 7 [**Bordeaux Métropole Énergies** Bordeaux Métropole Énergies helps the Bordeaux metropolitan area handle the energy transition issue.](https://millionrounds.com/company/bordeaux-metropole-energies) Bordeaux Métropole Énergies helps the Bordeaux metropolitan area handle the energy transition issue. *Founded* - Bordeaux, France **$101M** last round May 2025
- 8 [**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
- 9 [**Quilt** Quilt is a smart home climate solution company that develops home temperature control technology for energy efficiency.](https://millionrounds.com/company/quilt) Quilt is a smart home climate solution company that develops home temperature control technology for energy efficiency. *Founded* 2022 Redwood City, United States **$59M** last round Dec 2025
- 10 [**Black Bayou Energy Hub** Black Bayou Energy Hub is an essential storage facility for reliable and sustainable energy in the future.](https://millionrounds.com/company/black-bayou-energy-hub) Black Bayou Energy Hub is an essential storage facility for reliable and sustainable energy in the future. *Founded* - Louisiana, United States **$50M** last round Oct 2025
- 11 [**Multigig** Multigig is a fabless, high performance analog and mixed-signal semiconductor company.](https://millionrounds.com/company/multigig) Multigig is a fabless, high performance analog and mixed-signal semiconductor company. *Founded* 2003 West Palm Beach, United States **$38M** last round Dec 2010
- 12 [**Qpinch** Qpinch is a Belgian startup and scale-up focused on industrial energy efficiency and waste heat recovery.](https://millionrounds.com/company/qpinch) Qpinch is a Belgian startup and scale-up focused on industrial energy efficiency and waste heat recovery. *Founded* 2012 Antwerpen, Belgium **$35M** last round May 2024
- 13 [**OLEDWorks** OLEDWorks is a manufacturer of OLED light technology for automotive, general lighting, and specialty applications.](https://millionrounds.com/company/oledworks) OLEDWorks is a manufacturer of OLED light technology for automotive, general lighting, and specialty applications. *Founded* 2010 Rochester, United States **$35M** last round Jun 2025
- 14 [**Gradyent** Gradyent is a Rotterdam-based software company founded in 2019, specializing in Energy Technology and Artificial Intelligence.](https://millionrounds.com/company/gradyent) Gradyent is a Rotterdam-based software company founded in 2019, specializing in Energy Technology and Artificial Intelligence. *Founded* 2019 Rotterdam, Netherlands **$31M** last round Apr 2025
- 15 [**Ygrene Energy Fund** Ygrene, a leading Property Assessed Clean Energy (PACE) provider in Florida, offers an innovative financing solution for both residential and commercial propert](https://millionrounds.com/company/ygrene-energy-fund) Ygrene, a leading Property Assessed Clean Energy (PACE) provider in Florida, offers an innovative financing solution for both residential and commercial propert *Founded* 2009 Miami, United States **$30M** last round Aug 2014
- 16 [**NanoTech Materials** NanoTech Materials, Inc.](https://millionrounds.com/company/nanotech-materials) NanoTech Materials, Inc. *Founded* 2019 Houston, United States **$29M** last round Apr 2026
- 17 [**Energy Drive Systems** Energy Drive Systems as a Service, Energy Efficiency](https://millionrounds.com/company/energy-drive-systems) Energy Drive Systems as a Service, Energy Efficiency *Founded* - London, United Kingdom **$27M** last round Jun 2025
- 18 [**Recurve** Recurve Analytics, Inc.](https://millionrounds.com/company/recurve) Recurve Analytics, Inc. *Founded* 2015 Covina, United States **$26M** last round Apr 2025
- 19 [**OneD Battery Sciences** OneD Battery Sciences is a nanotechnology company based in Palo Alto, California, founded in 2013.](https://millionrounds.com/company/oned-battery-sciences) OneD Battery Sciences is a nanotechnology company based in Palo Alto, California, founded in 2013. *Founded* 2013 Palo Alto, United States **$25M** last round Sept 2022
- 20 [**FlexEnergy** FlexEnergy is digital platform that allows energy suppliers to reduce processes, operating costs and greenhouse gas emissions.](https://millionrounds.com/company/flexenergy) FlexEnergy is digital platform that allows energy suppliers to reduce processes, operating costs and greenhouse gas emissions. *Founded* 2013 United States **$24M** last round Dec 2014
- 21 [**EPIC Microsystems** Epic Microsystems develops advanced technology that boosts energy efficiency and computing performance in data centers.](https://millionrounds.com/company/epic-microsystems) Epic Microsystems develops advanced technology that boosts energy efficiency and computing performance in data centers. *Founded* - San Francisco, United States **$21M** last round Mar 2026
- 22 [**Venturous Group** Venturous Group is a CitytechTM business builder and investor.](https://millionrounds.com/company/venturous-group) Venturous Group is a CitytechTM business builder and investor. *Founded* 2019 Beijing **$21M** last round Aug 2023
- 23 [**Elevation** Elevation is a provider of residential solar, storage, energy efficiency, and energy intelligence technology.](https://millionrounds.com/company/elevation) Elevation is a provider of residential solar, storage, energy efficiency, and energy intelligence technology. *Founded* 2014 Chandler, United States **$20M** last round Sept 2023
- 24 [**EPS** EPS Corp.](https://millionrounds.com/company/eps) EPS Corp. *Founded* 2001 United States **$20M** last round Dec 2007
- 25 [**Karman Industries** Karman Industries is an industrial energy technology company based in Los Angeles, founded in 2024.](https://millionrounds.com/company/karman-industries) Karman Industries is an industrial energy technology company based in Los Angeles, founded in 2024. *Founded* 2024 Los Angeles, United States **$20M** last round Mar 2026
- 26 [**Siros Technologies** SIROS is a 3-D Geospatial Cloud-Driven Engine that improves the efficiency of the historical evaluation process for the energy industry.](https://millionrounds.com/company/siros-technologies) SIROS is a 3-D Geospatial Cloud-Driven Engine that improves the efficiency of the historical evaluation process for the energy industry. *Founded* 2020 Denver, United States **$17M** last round Mar 2002
- 27 [**Charge Robotics** Charge Robotics is dedicated to advancing the renewable energy sector by automating the labor-intensive stages of solar construction.](https://millionrounds.com/company/charge-robotics) Charge Robotics is dedicated to advancing the renewable energy sector by automating the labor-intensive stages of solar construction. *Founded* 2021 San Leandro, United States **$17M** last round Aug 2024
- 28 [**Tonik Energy** Tonik Energy was a UK-based renewable electricity and gas supplier founded in 2015 and headquartered in Birmingham.](https://millionrounds.com/company/tonik-energy) Tonik Energy was a UK-based renewable electricity and gas supplier founded in 2015 and headquartered in Birmingham. *Founded* 2015 Birmingham, United Kingdom **$17M** last round Feb 2019
- 29 [**Verdiem** Verdiem provides enterprise-class IT energy management and efficiency solutions for PCs, Macs and Cisco energywise devices.](https://millionrounds.com/company/verdiem) Verdiem provides enterprise-class IT energy management and efficiency solutions for PCs, Macs and Cisco energywise devices. *Founded* 2001 Seattle, United States **$17M** last round Jan 2010
- 30 [**7AC Technologies** 7AC Technologies energy-saving ultra-efficiency air conditioning systems.](https://millionrounds.com/company/7ac-technologies) 7AC Technologies energy-saving ultra-efficiency air conditioning systems. *Founded* 2009 United States **$16M** last round Jun 2015
- 31 [**re.green** re-green is a Frankfurt-based company founded in 2023 that specializes in enhancing the energy efficiency and ESG compliance of commercial real estate.](https://millionrounds.com/company/re-green) re-green is a Frankfurt-based company founded in 2023 that specializes in enhancing the energy efficiency and ESG compliance of commercial real estate. *Founded* 2023 Atlanta, Brazil **$14M** last round May 2025
- 32 [**Sunpure** SUNPURE is a high-tech company based in Hefei, China, specializing in intelligent robots for renewable energy applications, particularly in photovoltaic (PV) power plants.](https://millionrounds.com/company/sunpure) SUNPURE is a high-tech company based in Hefei, China, specializing in intelligent robots for renewable energy applications, particularly in photovoltaic (PV) power plants. *Founded* 2019 Hefei, China **$14M** last round Jan 2024
- 33 [**Next Core Technologies** Next Core Technologies is a tech company that offers prototype motor electrical and soft magnetic properties.](https://millionrounds.com/company/next-core-technologies) Next Core Technologies is a tech company that offers prototype motor electrical and soft magnetic properties. *Founded* - Uji, Japan **$13M** last round Mar 2026
- 34 [**Nanostellar** Nanostellar delivers nano-material catalysts that improve emissions control, energy efficiency, and synthesis of chemicals and fuels.](https://millionrounds.com/company/nanostellar) Nanostellar delivers nano-material catalysts that improve emissions control, energy efficiency, and synthesis of chemicals and fuels. *Founded* 2004 United States **$13M** last round Feb 2008
- 35 [**Daystar Power** Daystar Power specialises in providing solar power and energy efficiency solutions for businesses.](https://millionrounds.com/company/daystar-power) Daystar Power specialises in providing solar power and energy efficiency solutions for businesses. *Founded* 2017 Nigeria **$11M** last round Sept 2021
- 36 [**Eddy Grid** Eddy Grid is a Dutch energy technology startup based in Utrecht, founded in 2023.](https://millionrounds.com/company/eddy-grid) Eddy Grid is a Dutch energy technology startup based in Utrecht, founded in 2023. *Founded* 2023 Utrecht, Netherlands **$11M** last round May 2026
- 37 [**Terion** Terion is an AI-based energy management software company based in Copenhagen, Denmark.](https://millionrounds.com/company/terion) Terion is an AI-based energy management software company based in Copenhagen, Denmark. *Founded* 2024 Copenhagen, United States **$11M** last round Sept 2002
- 38 [**Triumfant** Triumfant offers solutions for malware detection, remediation, monitoring and security management of endpoint computers.](https://millionrounds.com/company/triumfant) Triumfant offers solutions for malware detection, remediation, monitoring and security management of endpoint computers. *Founded* 2002 United States **$9.8M** last round Aug 2014
- 39 [**Veros Systems** Veros Systems is an industrial asset monitoring company based in Austin, Texas, founded in 2001.](https://millionrounds.com/company/veros-systems) Veros Systems is an industrial asset monitoring company based in Austin, Texas, founded in 2001. *Founded* 2001 Austin, United States **$9.5M** last round Sept 2013
- 40 [**Pulsiv** Pulsiv is a UK-based company specializing in power electronics and solar technology.](https://millionrounds.com/company/pulsiv) Pulsiv is a UK-based company specializing in power electronics and solar technology. *Founded* 2013 Milton, United Kingdom **$7.6M** last round Jul 2026
- 41 [**Cenergist** Cenergist is a specialist energy and water efficiency company.](https://millionrounds.com/company/cenergist) Cenergist is a specialist energy and water efficiency company. *Founded* 2012 Washington, United Kingdom **$7.4M** last round May 2022
- 42 [**AirEx Technologies** AirEx Technologies is a climate tech company based in London, UK, focused on addressing climate change and fuel poverty through innovative smart home solutions.](https://millionrounds.com/company/airex-technologies) AirEx Technologies is a climate tech company based in London, UK, focused on addressing climate change and fuel poverty through innovative smart home solutions. *Founded* 2016 London, United Kingdom **$7.1M** last round May 2026
- 43 [**EcoloCap** EcoloCap Solutions Inc.](https://millionrounds.com/company/ecolocap) EcoloCap Solutions Inc. *Founded* 2007 United States **$6.9M** last round Sept 2009
- 44 [**Bluon** Bluon, Inc.](https://millionrounds.com/company/bluon) Bluon, Inc. *Founded* 2011 Irvine, United States **$6.6M** last round Apr 2023
- 45 [**SaveMoneyCutCarbon** SaveMoneyCutCarbon (SMCC) is a UK-based provider of clean technology and sustainability solutions, focused on enhancing energy and water efficiency for business](https://millionrounds.com/company/savemoneycutcarbon) SaveMoneyCutCarbon (SMCC) is a UK-based provider of clean technology and sustainability solutions, focused on enhancing energy and water efficiency for business *Founded* 2010 Bury Saint Edmunds, United Kingdom **$6.3M** last round May 2023
- 46 [**Millennial Net** Changing the way we manage the country's energy with state of the art submetering.](https://millionrounds.com/company/millennial-net) Changing the way we manage the country's energy with state of the art submetering. *Founded* 2000 United States **$6.0M** last round Apr 2003
- 47 [**Teragen Energy** Teragen Energy develops advanced regenerative fuel cells, offering a versatile energy technology platform that generates power and stores energy without combustion.](https://millionrounds.com/company/teragen-energy) Teragen Energy develops advanced regenerative fuel cells, offering a versatile energy technology platform that generates power and stores energy without combustion. *Founded* 2025 Southborough, United States **$6.0M** last round Aug 2026
- 48 [**Magnomatics** Magnomatics is a UK-based clean technology company focusing on renewable energy and energy efficiency.](https://millionrounds.com/company/magnomatics) Magnomatics is a UK-based clean technology company focusing on renewable energy and energy efficiency. *Founded* 2006 Sheffield, United Kingdom **$5.7M** last round Oct 2023
- 49 [**Tewke** Tewke is a London-based climate technology and home automation company dedicated to enhancing domestic energy efficiency and simplifying smart-home control.](https://millionrounds.com/company/tewke) Tewke is a London-based climate technology and home automation company dedicated to enhancing domestic energy efficiency and simplifying smart-home control. *Founded* 2019 London, United Kingdom **$5.6M** last round Apr 2026
- 50 [**Measurable.energy** measurable.energy is a UK-based clean-tech and PropTech company that focuses on AI-driven plug load management and energy efficiency solutions for commercial bu](https://millionrounds.com/company/measurable-energy) measurable.energy is a UK-based clean-tech and PropTech company that focuses on AI-driven plug load management and energy efficiency solutions for commercial bu *Founded* 2018 Reading, United Kingdom **$5.2M** last round Aug 2025

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies whose own description names this theme, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

## Who backed them?

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## More energy efficiency lists

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[*CG* *BM* *EE* **Energy efficiency startups in Europe** 43 companies · $3.0B](https://millionrounds.com/top-lists/energy-efficiency-startups-europe)

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