Top list · Worldwide

Energy efficiency startups worldwide

134 energy efficiency startups worldwide have raised money in rounds we track. These are the 50 that have raised the most, $5.1B between them, with the United States the most common home.

$5.1Braised by these 50
134on our record in all
United Statesmost common home
COX Groupraised the most
  1. 1COX GroupCOX Group provides solutions for development and management of water resources as well as services for energy generation and transmission.

    COX Group provides solutions for development and management of water resources as well as services for energy generation and transmission.

    Founded -Seville, Spain$2.6Blast round Jan 2026
  2. 2Unconventional AIUnconventional AI rethinks computer foundations to optimize energy efficiency for AI.

    Unconventional AI rethinks computer foundations to optimize energy efficiency for AI.

    Founded -San Francisco, United States$475Mlast round Dec 2025
  3. 3Presidio PetroleumPresidio Petroleum is a leading oil and gas efficiency company.

    Presidio Petroleum is a leading oil and gas efficiency company.

    Founded 2016Fort Worth, United States$350Mlast round Jun 2026
  4. 4GrenergyGrenergy specializes in research and development and sales of energy-saving power management chips.

    Grenergy specializes in research and development and sales of energy-saving power management chips.

    Founded 2016Nanjing$345Mlast round Jul 2024
  5. 5Counterpointe Sustainable Real EstateCSRE is leading the way in financing energy efficiency, renewables seismic strengthening, storm protection for commercial real estate.

    CSRE is leading the way in financing energy efficiency, renewables seismic strengthening, storm protection for commercial real estate.

    Founded 2015Stamford, United States$256Mlast round Jul 2023
  6. 6Plus PowerPlus Power specializes in creating battery energy storage systems that enhance the efficiency and reliability of the electrical grid.

    Plus Power specializes in creating battery energy storage systems that enhance the efficiency and reliability of the electrical grid.

    Founded 2018Houston, United States$160Mlast round Nov 2025
  7. 7Bordeaux Métropole ÉnergiesBordeaux Métropole Énergies helps the Bordeaux metropolitan area handle the energy transition issue.

    Bordeaux Métropole Énergies helps the Bordeaux metropolitan area handle the energy transition issue.

    Founded -Bordeaux, France$101Mlast round May 2025
  8. 8Eku EnergyEku Energy is a globally diversified and technology enabled energy storage business.

    Eku Energy is a globally diversified and technology enabled energy storage business.

    Founded 2022London, United Kingdom$60Mlast round May 2025
  9. 9QuiltQuilt is a smart home climate solution company that develops home temperature control technology for energy efficiency.

    Quilt is a smart home climate solution company that develops home temperature control technology for energy efficiency.

    Founded 2022Redwood City, United States$59Mlast round Dec 2025
  10. 10Black Bayou Energy HubBlack Bayou Energy Hub is an essential storage facility for reliable and sustainable energy in the future.

    Black Bayou Energy Hub is an essential storage facility for reliable and sustainable energy in the future.

    Founded -Louisiana, United States$50Mlast round Oct 2025
  11. 11MultigigMultigig is a fabless, high performance analog and mixed-signal semiconductor company.

    Multigig is a fabless, high performance analog and mixed-signal semiconductor company.

    Founded 2003West Palm Beach, United States$38Mlast round Dec 2010
  12. 12QpinchQpinch is a Belgian startup and scale-up focused on industrial energy efficiency and waste heat recovery.

    Qpinch is a Belgian startup and scale-up focused on industrial energy efficiency and waste heat recovery.

    Founded 2012Antwerpen, Belgium$35Mlast round May 2024
  13. 13OLEDWorksOLEDWorks is a manufacturer of OLED light technology for automotive, general lighting, and specialty applications.

    OLEDWorks is a manufacturer of OLED light technology for automotive, general lighting, and specialty applications.

    Founded 2010Rochester, United States$35Mlast round Jun 2025
  14. 14GradyentGradyent is a Rotterdam-based software company founded in 2019, specializing in Energy Technology and Artificial Intelligence.

    Gradyent is a Rotterdam-based software company founded in 2019, specializing in Energy Technology and Artificial Intelligence.

    Founded 2019Rotterdam, Netherlands$31Mlast round Apr 2025
  15. 15Ygrene Energy FundYgrene, a leading Property Assessed Clean Energy (PACE) provider in Florida, offers an innovative financing solution for both residential and commercial propert

    Ygrene, a leading Property Assessed Clean Energy (PACE) provider in Florida, offers an innovative financing solution for both residential and commercial propert

    Founded 2009Miami, United States$30Mlast round Aug 2014
  16. 16NanoTech MaterialsNanoTech Materials, Inc.

    NanoTech Materials, Inc.

    Founded 2019Houston, United States$29Mlast round Apr 2026
  17. 17Energy Drive SystemsEnergy Drive Systems as a Service, Energy Efficiency

    Energy Drive Systems as a Service, Energy Efficiency

    Founded -London, United Kingdom$27Mlast round Jun 2025
  18. 18RecurveRecurve Analytics, Inc.

    Recurve Analytics, Inc.

    Founded 2015Covina, United States$26Mlast round Apr 2025
  19. 19OneD Battery SciencesOneD Battery Sciences is a nanotechnology company based in Palo Alto, California, founded in 2013.

    OneD Battery Sciences is a nanotechnology company based in Palo Alto, California, founded in 2013.

    Founded 2013Palo Alto, United States$25Mlast round Sept 2022
  20. 20FlexEnergyFlexEnergy is digital platform that allows energy suppliers to reduce processes, operating costs and greenhouse gas emissions.

    FlexEnergy is digital platform that allows energy suppliers to reduce processes, operating costs and greenhouse gas emissions.

    Founded 2013United States$24Mlast round Dec 2014
  21. 21EPIC MicrosystemsEpic Microsystems develops advanced technology that boosts energy efficiency and computing performance in data centers.

    Epic Microsystems develops advanced technology that boosts energy efficiency and computing performance in data centers.

    Founded -San Francisco, United States$21Mlast round Mar 2026
  22. 22Venturous GroupVenturous Group is a CitytechTM business builder and investor.

    Venturous Group is a CitytechTM business builder and investor.

    Founded 2019Beijing$21Mlast round Aug 2023
  23. 23ElevationElevation is a provider of residential solar, storage, energy efficiency, and energy intelligence technology.

    Elevation is a provider of residential solar, storage, energy efficiency, and energy intelligence technology.

    Founded 2014Chandler, United States$20Mlast round Sept 2023
  24. 24EPSEPS Corp.

    EPS Corp.

    Founded 2001United States$20Mlast round Dec 2007
  25. 25Karman IndustriesKarman Industries is an industrial energy technology company based in Los Angeles, founded in 2024.

    Karman Industries is an industrial energy technology company based in Los Angeles, founded in 2024.

    Founded 2024Los Angeles, United States$20Mlast round Mar 2026
  26. 26Siros TechnologiesSIROS is a 3-D Geospatial Cloud-Driven Engine that improves the efficiency of the historical evaluation process for the energy industry.

    SIROS is a 3-D Geospatial Cloud-Driven Engine that improves the efficiency of the historical evaluation process for the energy industry.

    Founded 2020Denver, United States$17Mlast round Mar 2002
  27. 27Charge RoboticsCharge Robotics is dedicated to advancing the renewable energy sector by automating the labor-intensive stages of solar construction.

    Charge Robotics is dedicated to advancing the renewable energy sector by automating the labor-intensive stages of solar construction.

    Founded 2021San Leandro, United States$17Mlast round Aug 2024
  28. 28Tonik EnergyTonik Energy was a UK-based renewable electricity and gas supplier founded in 2015 and headquartered in Birmingham.

    Tonik Energy was a UK-based renewable electricity and gas supplier founded in 2015 and headquartered in Birmingham.

    Founded 2015Birmingham, United Kingdom$17Mlast round Feb 2019
  29. 29VerdiemVerdiem provides enterprise-class IT energy management and efficiency solutions for PCs, Macs and Cisco energywise devices.

    Verdiem provides enterprise-class IT energy management and efficiency solutions for PCs, Macs and Cisco energywise devices.

    Founded 2001Seattle, United States$17Mlast round Jan 2010
  30. 307AC Technologies7AC Technologies energy-saving ultra-efficiency air conditioning systems.

    7AC Technologies energy-saving ultra-efficiency air conditioning systems.

    Founded 2009United States$16Mlast round Jun 2015
  31. 31re.greenre-green is a Frankfurt-based company founded in 2023 that specializes in enhancing the energy efficiency and ESG compliance of commercial real estate.

    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 2023Atlanta, Brazil$14Mlast round May 2025
  32. 32SunpureSUNPURE is a high-tech company based in Hefei, China, specializing in intelligent robots for renewable energy applications, particularly in photovoltaic (PV) power plants.

    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 2019Hefei, China$14Mlast round Jan 2024
  33. 33Next Core TechnologiesNext Core Technologies is a tech company that offers prototype motor electrical and soft magnetic properties.

    Next Core Technologies is a tech company that offers prototype motor electrical and soft magnetic properties.

    Founded -Uji, Japan$13Mlast round Mar 2026
  34. 34NanostellarNanostellar delivers nano-material catalysts that improve emissions control, energy efficiency, and synthesis of chemicals and fuels.

    Nanostellar delivers nano-material catalysts that improve emissions control, energy efficiency, and synthesis of chemicals and fuels.

    Founded 2004United States$13Mlast round Feb 2008
  35. 35Daystar PowerDaystar Power specialises in providing solar power and energy efficiency solutions for businesses.

    Daystar Power specialises in providing solar power and energy efficiency solutions for businesses.

    Founded 2017Nigeria$11Mlast round Sept 2021
  36. 36Eddy GridEddy Grid is a Dutch energy technology startup based in Utrecht, founded in 2023.

    Eddy Grid is a Dutch energy technology startup based in Utrecht, founded in 2023.

    Founded 2023Utrecht, Netherlands$11Mlast round May 2026
  37. 37TerionTerion is an AI-based energy management software company based in Copenhagen, Denmark.

    Terion is an AI-based energy management software company based in Copenhagen, Denmark.

    Founded 2024Copenhagen, United States$11Mlast round Sept 2002
  38. 38TriumfantTriumfant offers solutions for malware detection, remediation, monitoring and security management of endpoint computers.

    Triumfant offers solutions for malware detection, remediation, monitoring and security management of endpoint computers.

    Founded 2002United States$9.8Mlast round Aug 2014
  39. 39Veros SystemsVeros Systems is an industrial asset monitoring company based in Austin, Texas, founded in 2001.

    Veros Systems is an industrial asset monitoring company based in Austin, Texas, founded in 2001.

    Founded 2001Austin, United States$9.5Mlast round Sept 2013
  40. 40PulsivPulsiv is a UK-based company specializing in power electronics and solar technology.

    Pulsiv is a UK-based company specializing in power electronics and solar technology.

    Founded 2013Milton, United Kingdom$7.6Mlast round Jul 2026
  41. 41CenergistCenergist is a specialist energy and water efficiency company.

    Cenergist is a specialist energy and water efficiency company.

    Founded 2012Washington, United Kingdom$7.4Mlast round May 2022
  42. 42AirEx TechnologiesAirEx Technologies is a climate tech company based in London, UK, focused on addressing climate change and fuel poverty through innovative smart home solutions.

    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 2016London, United Kingdom$7.1Mlast round May 2026
  43. 43EcoloCapEcoloCap Solutions Inc.

    EcoloCap Solutions Inc.

    Founded 2007United States$6.9Mlast round Sept 2009
  44. 44BluonBluon, Inc.

    Bluon, Inc.

    Founded 2011Irvine, United States$6.6Mlast round Apr 2023
  45. 45SaveMoneyCutCarbonSaveMoneyCutCarbon (SMCC) is a UK-based provider of clean technology and sustainability solutions, focused on enhancing energy and water efficiency for business

    SaveMoneyCutCarbon (SMCC) is a UK-based provider of clean technology and sustainability solutions, focused on enhancing energy and water efficiency for business

    Founded 2010Bury Saint Edmunds, United Kingdom$6.3Mlast round May 2023
  46. 46Millennial NetChanging the way we manage the country's energy with state of the art submetering.

    Changing the way we manage the country's energy with state of the art submetering.

    Founded 2000United States$6.0Mlast round Apr 2003
  47. 47Teragen EnergyTeragen Energy develops advanced regenerative fuel cells, offering a versatile energy technology platform that generates power and stores energy without combustion.

    Teragen Energy develops advanced regenerative fuel cells, offering a versatile energy technology platform that generates power and stores energy without combustion.

    Founded 2025Southborough, United States$6.0Mlast round Aug 2026
  48. 48MagnomaticsMagnomatics is a UK-based clean technology company focusing on renewable energy and energy efficiency.

    Magnomatics is a UK-based clean technology company focusing on renewable energy and energy efficiency.

    Founded 2006Sheffield, United Kingdom$5.7Mlast round Oct 2023
  49. 49TewkeTewke is a London-based climate technology and home automation company dedicated to enhancing domestic energy efficiency and simplifying smart-home control.

    Tewke is a London-based climate technology and home automation company dedicated to enhancing domestic energy efficiency and simplifying smart-home control.

    Founded 2019London, United Kingdom$5.6Mlast round Apr 2026
  50. 50Measurable.energymeasurable.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

    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 2018Reading, United Kingdom$5.2Mlast round Aug 2025
Total fundinghow the list is ranked
15 November 2026updated nightly
Rounds we tracksource: 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.

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