All Industries

Top Clean Energy Companies

201 Clean Energy companies, sorted by total funding raised.

ecobeeAcquired

ecobee makes smart thermostats, sensors, and home security devices that help homeowners save ener...

Toronto, Canada501–1000Clean Energy, IoT
Series C·$61.0M·Mar 2018
Rondo Energy

Rondo Energy makes the Rondo Heat Battery, which converts renewable electricity into continuous z...

Alameda, United StatesClean Energy, Energy Storage
Series B·$60.0M·Jan 2024
Leap

Platform for building and scaling virtual power plants, connecting distributed energy resources t...

San Francisco, United States51–200Clean Energy, Energy
Extension Round·$57.7M·Nov 2023
SolarSquare

Designs and installs rooftop solar systems for homes, housing societies, and businesses across In...

Mumbai, India1001–5000Renewable Energy, Solar Energy
Series B·$56.8M·Dec 2024
HomeTree

Residential energy services provider offering boiler/homecover, renewable installations and finan...

London, United Kingdom201–500Clean Energy, Renewable Energy
Series B·$55.1M·Apr 2023
Aquion Energy

Developer of saltwater Aqueous Hybrid Ion batteries for grid-scale and off-grid energy storage us...

Pittsburgh, United States51–200Clean Energy, Energy Storage
Series D·$55.0M·Jan 2014
HC
Heirloom Carbon

Direct air capture company that accelerates limestone's natural ability to absorb CO2 from days t...

San Francisco, United States51–200Carbon Capture, Clean Energy
Series A·$53.0M·Aug 2023
Advanced Microgrid SolutionsAcquired

AI-driven energy storage and microgrid software platform for commercial, industrial, and utility ...

San Francisco, United States51–200Clean Energy, Artificial Intelligence
Series B·$52.0M·Jul 2017
SES AIIPO

AI-enhanced lithium-metal battery developer accelerating the energy transition through material d...

Woburn, United States201–500Energy Storage, Clean Energy
Series D·$50.0M·May 2021
SDCL

Sustainable Development Capital LLP is a developer, investor and fund manager focused on energy e...

London, United Kingdom11–50Climate Tech, Clean Energy
Corporate Round·$50.0M·Jun 2024
Erthos

Utility-scale earth-mounted solar PV company that lays panels flat on the ground to reduce costs ...

Tempe, United States51–200Energy, Clean Energy
Series A·$48.0M·Sep 2023
Stem

Provides AI-driven software and managed services to optimize solar and battery energy assets for ...

San Francisco, United States501–1000Artificial Intelligence, Clean Energy
Series B·$45.2M·Dec 2013
InnowattsAcquired

AI-powered energy analytics platform providing forecasting and consumer insights to utilities, en...

Houston, United States51–200Artificial Intelligence, Energy
Series B·$45.0M·Feb 2021
Realta Fusion

Develops compact, scalable modular fusion energy systems for industrial heat and power, targeting...

Madison, United States11–50Clean Energy, Deep Tech
Series A·$45.0M·May 2025
Whisper Aero

Develops ultra-quiet, efficient electric propulsion systems for aircraft and drones, serving aero...

Crossville, United States51–200Aerospace, Clean Energy
Series A·$39.5M·Apr 2023
Solar JunctionAcquired

Developing high efficiency triple junction solar cells

San Jose, United States51–200Clean energy, Photovoltaics
Venture Unknown·$39.4M·Apr 2013
Fourth Power

Develops utility-scale thermal energy storage using liquid metal and TPV to deliver low-cost, lon...

Cambridge, United States1–10Clean Energy, Climate Tech
Series B·$39.0M·Sep 2025
myenergi

UK manufacturer of eco-smart home energy management devices including the zappi EV charger and so...

Market Rasen, United Kingdom201–500Clean Energy, Electric Vehicles
Growth Equity·$37.5M·Oct 2023
Spiritus

Climate tech startup developing Direct Air Capture technology to remove CO2 from the atmosphere a...

United StatesClean Energy, Climate Tech
Series A·$33.6M·Mar 2025
Metafuels

A Zurich-based clean energy startup developing proprietary technology to convert green methanol i...

Zurich, Switzerland1–10Aerospace, Clean Energy
Series A·$32.0M·Feb 2026
Anthro Energy

Develops polymer electrolytes and lithium-ion battery cells that improve safety, energy density, ...

San Jose, United States11–50Clean Energy, Energy Storage
Grant·$30.7M·Mar 2025
Flux Marine

Advancing electric marine propulsion technology

Bristol, United States11–50Clean Energy, Electric Vehicles
Series B·$30.5M·Nov 2025
AE
Airloom Energy

Wind energy startup developing a low-cost, modular wind capture system using vertically oriented ...

Laramie, United States11–50Clean Energy, Renewable Energy
Seed·$30.4M·Oct 2024
Carbon America

Carbon America is a vertically integrated developer of carbon capture and sequestration (CCS) pro...

Arvada, United States11–50Climate Tech, Carbon Capture
Series A·$30.0M·Dec 2021
Carbon Energy

Carbon Energy let's you keep your business carbon free. We provide CDR credit based on our DAC(D...

San Francisco, United States1–10Carbon Capture, Clean Energy
Growth Equity·$30.0M·Jul 2011