All Industries

Top Clean Energy Companies

201 Clean Energy companies, sorted by total funding raised.

Zap Energy

Nuclear fusion energy company developing compact, low-cost fusion reactors using sheared-flow-sta...

Everett, United States51–200Nuclear Fusion, Clean Energy
Series D·$324.0M·Sep 2024
Sun King

Sun King manufactures and sells solar lanterns and solar home systems to off-grid and under-elect...

Nairobi, Kenya1001–5000Climate Tech, Clean Energy
Growth Equity·$312.0M·Dec 2025
Span

Smart electrical panel that adds intelligence and control to home energy management.

San Francisco, United States51–200Clean Energy, Hardware
Corporate Round·$271.2M·Mar 2026
Zolar

AI-first platform connecting homeowners and installers to design, buy, and manage residential sol...

Berlin, Germany11–50Clean Energy, Climate Tech
Growth Equity·$254.2M·Apr 2024
Ola ElectricIPO

Ola Electric is India's leading electric vehicle manufacturer, producing electric scooters and mo...

Bangalore, India501–1000Clean Energy, Mobility
Series B·$250.0M·Jul 2019
Nikola Corporation

Hydrogen-electric semi-truck developer and energy company.

Phoenix, United States501–1000Electric Vehicles, Clean Energy
Series D·$250.0M·Sep 2019
Energy Vault

Energy Vault develops utility-scale energy storage solutions including gravity-based, battery, an...

Westlake Village, United States201–500Clean Energy, Energy Storage
Series C·$210.0M·Oct 2021
Proxima Fusion

Develops QI stellarators and designs fusion power plants, partnering with utilities and institute...

Munich, Germany51–200Clean Energy, Deep Tech
Series A·$193.7M·Sep 2025
Standard Nuclear

Manufacturer of TRISO nuclear fuel for advanced reactors, supplying utilities and reactor develop...

Oak Ridge, United States11–50Clean Energy, Nuclear Energy
Series A·$182.0M·Jan 2026
Volta ChargingAcquired

EV charging network operator offering free charging at popular commercial locations powered by br...

San Francisco, United States201–500Electric Vehicles, Clean Energy
Series D·$180.0M·Jan 2021
Heron Power Electronics

Heron Power designs solid-state transformers to modernize the electric grid, enabling greater ren...

Scotts Valley, United StatesClean Energy, Power Electronics
Series B·$178.0M·Feb 2026
PowinAcquired

Oregon-based utility-scale energy storage integrator providing battery systems and management sof...

Portland, United States201–500Clean Energy, Energy Storage
Growth Equity·$160.0M·Jul 2022
H2Pro

Israeli startup developing affordable green hydrogen production technology that connects directly...

IsraelClean Energy, Hydrogen
Venture Unknown·$158.2M·Jan 2024
BlocPower

Designs, finances, and installs clean energy and efficiency upgrades for building owners and unde...

New York, United States51–200Clean Energy, Climate Tech
Series B·$155.0M·Mar 2023
Bloom EnergyIPO

Solid oxide fuel cell technology and products for distributed electricity and hydrogen generation

San Jose, United States1001–5000Clean Energy, Fuel Cells
Venture Unknown·$150.0M·Sep 2011
Zanskar

AI-native geothermal company that uses subsurface data and geoscience to find and develop utility...

Salt Lake City, United States51–200Artificial Intelligence, Clean Tech
Series C·$115.0M·Jan 2026
Infravision

Infravision builds drone-enabled systems that modernize power line construction for faster, safer...

United StatesRobotics, Clean Energy
Series B·$114.0M·Nov 2025
Deep Sky

Deep Sky builds, owns, and operates carbon removal infrastructure to reverse climate change at sc...

Montreal, Canada11–50Carbon Capture, Clean Energy
Grant·$112.4M·Dec 2024
Primus Power

developing grid-scale flow batteries that can be sized to stabilize renewables

Hayward, United States51–200Clean Energy, Energy Storage
Series E·$92.0M·Mar 2017
Aeroseal

Climate technology company providing patented aerosol-based duct and envelope air sealing solutio...

Miamisburg, United States201–500Clean Energy, Climate Tech
Series B·$89.0M·Jul 2023
Panthalas

Develops ocean-deployed renewable energy platforms with embedded compute to supply low-cost, zero...

Portland, United States51–200Clean Energy, Cloud
Series B·$78.0M·Aug 2024
Daylight Energy

Decentralized home energy company that installs solar and battery systems with $0 upfront cost, h...

New York, United States1–10Clean Energy, Climate Tech
Venture Unknown·$75.0M·Oct 2024
Exowatt

Builds modular, dispatchable solar-plus-thermal energy systems for data centers and industrial cu...

Miami, United States51–200Clean Energy, Energy Storage
Series A·$70.0M·Apr 2025
Avalanche Energy

Developer of compact, mobile fusion reactors providing neutron sources and distributed power for ...

Seattle, United States51–200Clean Energy, Defense Tech
Venture Unknown·$69.0M·Feb 2026
GridBeyond

AI-powered energy platform optimizing distributed energy resources, demand response, and grid sta...

Dublin, Ireland51–200Clean Energy, Artificial Intelligence
Series D·$67.0M·Mar 2026