Top 100 Clean Energy Startups to Watch in 2026
The clean energy sector is attracting major investment for a wide range of technologies. Startups are developing everything from commercial fusion systems to advanced nuclear reactors.
For example, Commonwealth Fusion Systems has secured $2.9 billion to pursue fusion energy, while Masdar has raised $3.3 billion for its renewable projects.
Below is our list of 100 Clean Energy startups worth keeping an eye on.
Failory's Top 10 Picks
Commonwealth Fusion Systems builds compact, powerful fusion machines with the goal of bringing limitless clean energy to the grid. Their approach relies on groundbreaking high-temperature superconducting magnet technology to create commercially viable fusion power plants on a faster timeline.
| Headquarters | Cambridge, Massachusetts, United States |
| Year Founded | 2017 |
| Founders | Dan Brunner, Martin Greenwald, Robert Mumgaard |
| Funding Amount | $2.9B |
| Startup Size | Major Organization (1,001-5,000) |
| Last Funding Status | Series B |
| Top Investors | Temasek Holdings, Khosla Ventures, HOF Capital, Quiet Capital, Google |
X-energy develops advanced modular nuclear reactors and proprietary fuel technology to generate clean, carbon-free energy. The company's reactor designs focus on safety and scalability, making them a potential power source for public grids and heavy industry.
| Headquarters | Rockville, Maryland, United States |
| Year Founded | 2009 |
| Founders | Kam Ghaffarian |
| Funding Amount | $1B |
| Startup Size | Large Team (251-1,000) |
| Last Funding Status | Private Equity |
| Top Investors | Alumni Ventures, Ares Management, Jane Street Capital, University of Michigan, NGP Energy Capital Management |
Masdar develops and operates a global portfolio of renewable energy projects, including solar, wind, energy storage, and geothermal power. They are recognized for their large-scale utility projects and commitment to advancing clean technology worldwide.
| Headquarters | Abu Dhabi, Abu Dhabi, United Arab Emirates |
| Year Founded | 2006 |
| Founders | H.E. Sultan Al Jaber |
| Funding Amount | $3.3B |
| Startup Size | Large Team (251-1,000) |
| Last Funding Status | Debt Financing |
| Top Investors | European Investment Bank, European Bank for Reconstruction and Development, International Finance Corporation, Asian Development Bank, Asian Infrastructure Investment Bank |
EcoFlow builds portable power stations and other renewable energy solutions. Their popular DELTA and RIVER product lines provide clean, reliable electricity for home backup, professional work, and off-grid living.
| Headquarters | San Francisco, California, United States |
| Year Founded | 2016 |
| Founders | Eli Harris, Fan Zheng, Hannah Sieber, Lei Wang |
| Funding Amount | $114.4M |
| Startup Size | Major Organization (1,001-5,000) |
| Last Funding Status | Product Crowdfunding |
| Top Investors | HSG, CICC, GL Ventures LLC, Delian Capital, Guoxin Fund |
Radiant is building portable nuclear microreactors that function as a clean energy alternative to diesel generators. The technology provides reliable, zero-emission power for remote communities and military operations.
| Headquarters | El Segundo, California, United States |
| Year Founded | 2019 |
| Founders | Bob Urberger, Doug Bernauer |
| Funding Amount | $218.8M |
| Startup Size | Mid-Size Team (51-250) |
| Last Funding Status | Series C |
| Top Investors | Andreessen Horowitz, Alumni Ventures, Tribe Capital, Draper Associates, StepStone Group |
BLUETTI builds clean energy storage systems for homes and outdoor adventures. Their product line includes portable power stations and home battery backup solutions designed for reliable, off-grid power.
| Headquarters | Chino, California, United States |
| Year Founded | 2019 |
| Founders | James Ray, Wonder Law |
| Funding Amount | $24.1M |
| Startup Size | Mid-Size Team (51-250) |
| Last Funding Status | Product Crowdfunding |
| Top Investors | — |
Mainspring Energy created a new type of power generator to provide clean and reliable electricity for commercial and industrial use. Their signature linear generator offers fuel flexibility, helping businesses reduce costs and carbon emissions on the path to a net-zero grid.
| Headquarters | Menlo Park, California, United States |
| Year Founded | 2010 |
| Founders | Adam Simpson, Matt Svrcek, Shannon Miller |
| Funding Amount | $813M |
| Startup Size | Large Team (251-1,000) |
| Last Funding Status | Series F |
| Top Investors | General Catalyst, Temasek Holdings, Alumni Ventures, Khosla Ventures, Lightrock |
Ultraviolette Automotive builds high-performance electric motorcycles that integrate advanced battery technology with aviation-inspired design. Their flagship F77 model provides riders with a powerful combination of speed, performance, and connected features.
| Headquarters | Bangalore, Karnataka, India |
| Year Founded | 2016 |
| Founders | Narayan Subramaniam, Niraj Rajmohan |
| Funding Amount | $90.2M |
| Startup Size | Large Team (251-1,000) |
| Last Funding Status | Venture Round |
| Top Investors | TDK Ventures, Speciale Invest, Lingotto, Zoho, TVS Motor Company |
Nexamp builds and manages community solar farms that make clean energy accessible to homeowners, renters, and businesses. Through a subscription service, customers can save on their electricity bills by tapping into local solar power.
| Headquarters | Boston, Massachusetts, United States |
| Year Founded | 2007 |
| Founders | William Thompson |
| Funding Amount | $2.4B |
| Startup Size | Large Team (251-1,000) |
| Last Funding Status | Debt Financing |
| Top Investors | Generate Capital, Macquarie Asset Management, Mitsubishi UFJ Financial Group, Manulife Investment Management, Nomura |
Last Energy builds and operates micro modular nuclear power plants, offering a new model for clean energy delivery. Their system is designed to provide scalable, carbon-free power directly to industrial customers.
| Headquarters | Washington, District of Columbia, United States |
| Year Founded | 2020 |
| Founders | Bret Kugelmass |
| Funding Amount | $64M |
| Startup Size | Mid-Size Team (51-250) |
| Last Funding Status | Series B |
| Top Investors | First Round Capital, Quiet Capital, Gigafund, Armada Investment AG, Amitis Capital |
90 Additional Clean Energy Startups Worth Following
The top 10 are just a small slice of the activity happening in the clean energy sector. Founders have collectively raised tens of billions of dollars, building everything from brand new hardware to AI-powered grid management.
This wave of work is what will define the industry for years to come. Below is a look at 90 more companies that are part of this important movement.
| Startup | Main Industry | Year Founded | Amount Raised | Last Funding Round |
|---|---|---|---|---|
 Chakr Innovation | Energy | 2016 | $26.6M | Series C |
 Eden | Energy | 2017 | $18.2M | — |
 The Nuclear Company | Energy | 2023 | $46.3M | Series A |
 Arevon | Energy | 2017 | $3.5B | Undisclosed |
 Terrestrial Energy | Energy | 2013 | $106.6M | Venture Round |
 Deep Isolation | Energy | 2016 | $55.6M | Venture Round |
 Proxima Fusion | Energy | 2023 | $196.5M | Series A |
 Aspen Power | Energy | 2020 | $867M | Undisclosed |
 Kyoto Fusioneering | Energy | 2019 | ¥22.3B | Debt Financing |
 ENGIE North America | Energy | 1981 | $1B | Debt Financing |
 Amogy | Energy | 2020 | $298.3M | Venture Round |
 Seabound | Environment | 2021 | $7M | Grant |
 Svante | Environment | 2007 | $505.3M | Grant |
 ICE Thermal Harvesting | Energy | 2021 | $151.7M | Debt Financing |
 itselectric | Energy | 2021 | $11M | Grant |
 encentive | Energy | 2020 | $9M | Seed |
 Mosaic | Energy | 2011 | $489.2M | Private Equity |
 mopo | Energy | 2013 | $19.5M | Venture Round |
 Utilidata | AI | 2012 | $95.3M | Series C |
 Type One Energy | Energy | 2019 | $82.5M | Seed |
 Sonnedix | Energy | 2009 | $7.7B | Debt Financing |
 VEMO | Energy | 2021 | $373.3M | Private Equity |
 Glydways | Energy | 2016 | $212.5M | Undisclosed |
 ElectricFish | Mobility | 2019 | $2.7M | Seed |
 Stride | Energy | 2021 | $8.5M | Series A |
 Newcleo | Energy | 2021 | $677.1M | Series A |
 ChargerHelp! | Energy | 2020 | $20.3M | Series A |
 Solstice | Energy | 2014 | $4.7M | Grant |
 Stegra | Energy | 2020 | $10.9B | Debt Financing |
 XENDEE Corporation | Energy | 2018 | $23M | Series B |
 TerraPower | Energy | 2006 | $1.5B | Venture Round |
 Electric Hydrogen | Energy | 2020 | $798.3M | Debt Financing |
 Zypp Electric | Energy | 2017 | $90.9M | Series C |
 Arcadia | Energy | 2014 | $575.5M | Series E |
 Atlas Renewable Energy | Energy | 2017 | $1.5B | Debt Financing |
 Gradiant | Energy | 2013 | $392.4M | Series D |
 Ohmium | Energy | 2019 | $297M | Corporate Round |
 PosiGen | Energy | 2011 | $835M | Debt Financing |
 Northvolt | Hardware | 2016 | $13.8B | Debt Financing |
 Gridmatic | AI | 2016 | $46M | Undisclosed |
 Boldr | Energy | 2022 | $7.7M | Seed |
 Caban Systems | Hardware | 2018 | $136M | Private Equity |
 Palmetto | Energy | 2009 | $1.8B | Debt Financing |
 Lunar Energy | Energy | 2020 | $300M | Series C |
 dcbel | AI | 2015 | $145M | Venture Round |
 BlocPower | Energy | 2014 | $266.6M | Grant |
 Blykalla | Energy | 2013 | SEK80M | Grant |
 Thea Energy | Energy | 2022 | $20M | Grant |
 Sunsure Energy | Energy | 2014 | ₹103.5B | Debt Financing |
 Sonnen | Hardware | 2010 | $169.2M | Series E |
 BURN | Energy | 2011 | $130.5M | Debt Financing |
 VoltStorage | Hardware | 2016 | $68.8M | Debt Financing |
 Magenta Mobility | Mobility | 2018 | $69.8M | Series B |
 Sahara Group | Energy | 1996 | $225M | Debt Financing |
 Elcogen | Energy | 2001 | $145M | Venture Round |
 Sun King | Energy | 2007 | $950M | Debt Financing |
 Power Dime | AI | 2024 | CA$220k | Pre-Seed |
 GAC Aion New Energy Automobile | Mobility | 2017 | CN¥18.3B | Series A |
 EDP Renewables APAC | Energy | 2011 | $400.7M | Corporate Round |
 Infiniti Recycling | Hardware | 2023 | £800k | Grant |
 e-Zinc | Energy | 2012 | $73.2M | Series A |
 TagEnergy | Energy | 2019 | $1.2B | Debt Financing |
 Thorizon | Energy | 2018 | $42.5M | Series A |
 trawa | Energy | 2022 | $36.4M | Series A |
 tado° | Energy | 2011 | $250.1M | Corporate Round |
 Avaada | Energy | 2017 | $3.7B | Debt Financing |
 ZunRoof | Energy | 2016 | $9.8M | Venture Round |
 GKinetic Energy | Energy | 2014 | €4.6M | Grant |
 Hylenr Technologies Private Limited | Energy | 2024 | $3M | Seed |
 Jakson Green | Energy | 2022 | ₹3.6B | Debt Financing |
 Continuum Industries | AI | 2018 | £12.3M | Series A |
 Weishi Energy | Energy | 2019 | CN¥1.5B | Series C |
 ICODOS | Manufacturing | 2022 | €2M | Pre-Seed |
 Allume Energy | Energy | 2015 | $11.1M | Grant |
 GrowUp Farms | AgTech | 2013 | £139.1M | Private Equity |
 UrbanChain | AI | 2017 | £56.6M | Series B |
 Nuada | Environment | 2012 | £12.2M | Grant |
 Thrive Renewables | Energy | 1995 | £15.4M | Debt Financing |
 Ryse Energy | Energy | 2019 | $15M | Private Equity |
 NX Technologies | Mobility | 2020 | $6M | Grant |
 HYBRICO Energy Technologies | Energy | 2016 | $15.2M | Venture Round |
 Brite Energy Partners | Media | 2017 | ₩104B | Venture Round |
 Cortexia | Energy | 2016 | $2.7M | Seed |
 Kitemill | Energy | 2008 | $13.7M | Grant |
 Jolt Electrodes | Manufacturing | 2022 | $6M | Series A |
 Solar Monkey | Energy | 2014 | $5.2M | Venture Round |
 CYTOK® hydrogen pirates® | Energy | 2023 | $717.1k | Undisclosed |
 Resalta | Energy | 2011 | €12M | Debt Financing |
 Laki Power | Energy | 2015 | €6.3M | Venture Round |
 Qpinch | Energy | 2012 | €14M | Series B |
