All Industries

Top Energy Companies

2,316 Energy companies, sorted by total funding raised.

SDCL

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

London, United Kingdom11–50Climate Tech, Clean Energy
Corporate RoundTotal funding$50.0MJun 2024
Sustech

Tokyo-based decarbonization platform helping companies build renewable power plants and manage ca...

Tokyo, JapanEnergy, Sustainability
Venture RoundTotal funding$50.0MOct 2024
David Energy

David Energy is a technology-driven retail electricity provider that manages distributed energy r...

New York, United States11–50Clean Tech, Energy
Series BTotal funding$49.1MApr 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 ATotal funding$48.0MSep 2023
MAINSTREAM ENGINEERING CORP

R&D company with 248 SBIR/STTR awards from Department of Defense, Environmental Protection Agency...

ROCKLEDGE, United States51–200Deep Tech, Defense Tech
GrantTotal funding$47.5MJul 2025
Heimdall Power

Heimdall Power brings greater awareness and intelligence to power grids, making them safer, smart...

Oslo, Norway51–200Energy
Series BTotal funding$47.0MJul 2024
Emo Energy

Energy technology startup developing clean energy solutions.

Bengaluru, India11–50Climate Tech, Energy
Series BTotal funding$46.0MJun 2026
XL Batteries

XL Batteries scales a long-duration energy storage solution by combining flow battery architectur...

Paris, United StatesEnergy, Climate Tech
Series ATotal funding$46.0MSep 2025
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 BTotal funding$45.2MDec 2013
InnowattsAcquired

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

Houston, United States51–200Artificial Intelligence, Energy
Series BTotal funding$45.0MFeb 2021
Queens Carbon

Queens Carbon is developing groundbreaking processing technology to significantly reduce the ener...

San Francisco, United States1–10Energy, Clean Tech
SeedTotal funding$44.5MApr 2025
FirstFuelAcquired
Lexington, United States51–200Analytics, Clean Tech
Series DTotal funding$43.9MJul 2017
OXEON ENERGY LLC

R&D company with 8 SBIR/STTR awards from National Aeronautics and Space Administration, Departmen...

North Salt Lake, United States11–50Clean Energy, Clean Tech
GrantTotal funding$42.7MSep 2024
ADVANCED COOLING TECHNOLOGIES INC

R&D company with 174 SBIR/STTR awards from Department of Defense, Department of Health and Human ...

Lancaster, United States201–500Aerospace, Defense Tech
Private EquityTotal funding$42.4MMar 2026
Zema Global

Data management and analytics platform for energy, commodities, and financial sectors ingesting f...

Toronto, Canada51–200Data & Analytics, Energy
Growth EquityTotal funding$42.0MJul 2024
CienaIPO

Optical networking systems and software company providing transport, switching, and management so...

Hanover, United States5001–10000Energy, Infrastructure
AngelTotal funding$41.3MApr 1994
Axle

Axle is an AI-powered freight factor. We provide small freight brokers with affordable, short-ter...

San Francisco, United StatesEnergy
SeedTotal funding$40.0MApr 2023
ElectronX

CFTC-regulated intraday electricity exchange offering derivatives to manage short-term power pric...

Chicago, United States11–50Energy, Fintech
Series ATotal funding$40.0MNov 2025
Gaussion

London-based energy intelligence technology for battery packs.

London, United Kingdom11–50Deep Tech, Energy
Venture RoundTotal funding$40.0MJun 2026
GridX

Enterprise rate engine platform helping utilities design, analyze, and communicate complex energy...

Milpitas51–200Energy
Series CTotal funding$40.0MApr 2022
Mayfair Gold Corp. Common SharesIPO

Canadian gold exploration company advancing the Fenn-Gib gold project in Ontario, focused on mine...

Matheson, Canada1–10Climate Tech, Energy
Private EquityTotal funding$40.0MSep 2025
Reach Labs

Reach Labs builds AI-driven wireless power beaming technology that transmits electricity over lon...

Redwood City, United States11–50Clean Tech, Deep Tech
GrantTotal funding$39.1MFeb 2025
1001 AI

1001 provides an AI-powered intelligence layer that helps enterprises transform decisions, orches...

London, United Kingdom1–10Artificial Intelligence, Construction Tech
Series ATotal funding$39.0MJun 2026
SPECTRAL ENERGIES LLC

R&D company with 201 SBIR/STTR awards from Department of Defense, Department of Energy, National ...

BEAVERCREEK, United States11–50Aerospace, Defense Tech
GrantTotal funding$38.6MNov 2025
Rodatherm

Privately held geothermal power generation company focused on advanced geothermal systems in the ...

United StatesEnergy
Series ATotal funding$38.0MSep 2025