All Rankings

Top 100 Energy Startups 2026

Private energy companies whose latest recorded funding type is not a grant, private equity, or debt financing, ranked by disclosed lifetime funding.

Known total funding for 100 of 100 ranked companies: $47.3B.

Showing top 100 matching companies · Ranked by total funding raised

Use company data through the API.
Example request
curl "https://indexed.vc/api/v1/companies?industries=Energy&operatingStatus=active&sort=total_funding_raised&order=desc&limit=100" -H "X-API-Key: YOUR_API_KEY"

The API has no company type filter, so public companies can appear; this list counts private companies only.

The API cannot leave out companies whose latest round is a grant, private equity or debt financing; this list does.

Data from Indexed.vcUpdated

Methodology: up to 100 active companies matching this list's filters are ordered by disclosed total funding in USD. Companies whose latest round is one of: Grant, Private Equity, Debt Financing are excluded. Totals include recorded grants and other qualifying funding, not just equity. Open a company profile for its funding summary and available detail. How this data is built.

51
Neara

Neara builds a physics-enabled digital twin of electricity grids and infrastructure networks, hel...

Sydney, Australia51–200Energy, SaaS
Series DTotal funding$196.3MFeb 2026
52
Reverion

Reverion builds carbon-negative biogas power plants using solid oxide fuel cell technology, doubl...

Munich, Germany11–50Clean Energy, Climate Tech
Series BTotal funding$184.9MOct 2026
53
Standard Nuclear

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

Oak Ridge, United States11–50Clean Energy, Nuclear Energy
Series ATotal funding$182.0MJan 2026
54
NoTraffic

NoTraffic is a plug & play turnkey solution for managing traffic using AI & Real-time optimization.

Tokyo, Israel51–200Energy, Artificial Intelligence
Series CTotal funding$178.7MMar 2026
55
Enter

Enter advises German homeowners, analyzes their houses and consumption, plans and installs heat p...

Berlin, Germany51–200Clean Tech, Energy
Series BTotal funding$177.8MMay 2026
56
Tibber

Digital energy company using an app and smart technology to sell renewable electricity and optimi...

Førde, Norway201–500Clean Tech, Energy
Series CTotal funding$177.0MJun 2022
57
Mazama Energy

Mazama Energy is a geothermal developer advancing technologies to extract heat from superhot rock...

United States1–10Clean Tech, Energy
Series BTotal funding$171.0MSep 2026
58
San Joaquin Renewables
Energy, Oil & Gas
Growth EquityTotal funding$165.0MOct 2021
59
WRC Energy

WRC Energy is an independent oil and natural gas company formed from Wold Energy Partners and Reb...

Denver, United States11–50Energy
Venture RoundTotal funding$160.0M
60
Zanskar

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

Salt Lake City, United States51–200Artificial Intelligence, Clean Energy
Series CTotal funding$157.0MJan 2026
61
Cavalcade Midstream
San Antonio, United States1–10Energy, Oil & Gas
Growth EquityTotal funding$150.0MDec 2018
62
Western LNG
United StatesEnergy, Oil & Gas
Growth EquityTotal funding$150.0MJan 2025
63
Ineratec

INERATEC produces synthetic e-Fuels and e-Chemicals using patented Power-to-X technology, convert...

Karlsruhe, Germany51–200Clean Tech, Energy
Series BTotal funding$149.0MJan 2024
64
Mangrove Lithium

Develops electrochemical lithium refining technology to produce battery-grade lithium for produce...

Delta, Canada11–50Advanced Materials, Clean Tech
Growth EquityTotal funding$148.7MJan 2026
65
ZutaCore

ZutaCore builds HyperCool, a waterless two-phase direct-to-chip liquid cooling system that helps ...

Tokyo, Israel51–200Deep Tech, Energy
Series CTotal funding$148.0MJun 2026
66
Booster U

Business-focused mobile fuel delivery service that brings gasoline, diesel, and on-site fueling d...

San Mateo, United States201–500Energy, Logistics
Series DTotal funding$145.0MMay 2022
67
Symend

Symend transforms enterprise collections through a customer engagement platform that combines art...

Calgary, Canada51–200Energy
Series CTotal funding$143.0MNov 2022
68
Smart Wires

Smart Wires provides grid-enhancing power flow control technology and software that helps electri...

Research Triangle Park, United States51–200Clean Tech, Energy
Growth EquityTotal funding$140.0MJan 2025
69
Thea Energy

Develops planar‑coil stellarator fusion systems delivering scalable, zero-emission power using ma...

Kearny, United States51–200Clean Energy, Energy
Series BTotal funding$140.0MMay 2026
70
Element Energy

Element Energy builds battery management hardware, embedded software, and SaaS that improve safet...

Menlo Park, United States11–50Climate Tech, Energy
Series BTotal funding$139.0MNov 2023
71
SolarSquare

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

Mumbai, India1001–5000Clean Energy, Climate Tech
Series CTotal funding$134.8MJun 2026
72
Aalo Atomics

Aalo Atomics is a nuclear engineering company that factory-fabricates modular reactors designed t...

Austin, United States51–200Energy, Hardware
Series BTotal funding$127.0MAug 2025
73
North American Helium
Energy, Industrials
Series BTotal funding$127.0MNov 2021
74
FlexGen

FlexGen designs and integrates battery energy storage solutions, combining energy management soft...

Durham, United States201–500Energy, Energy Storage
Series CTotal funding$125.5MJul 2022
75
Tokamak Energy

Tokamak Energy develops commercial fusion energy and high-temperature superconducting magnet tech...

Abingdon, United Kingdom201–500Deep Tech, Energy
Venture RoundTotal funding$125.0MNov 2024