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.

1
Oryx Midstream

Oryx is a full-service Permian Basin midstream company offering producers customer-focused servic...

Midland, United States51–200Energy
Growth EquityTotal funding$4.2BAug 2019
2
Commonwealth Fusion Systems

MIT spinout developing compact fusion energy plants using high-temperature superconducting magnet...

Devens, United States501–1000Climate Tech, Energy
Venture RoundTotal funding$3.9BJul 2026
3
AEP Transmission

AEP Transmission develops electric infrastructure and energy solutions with utilities, communitie...

Columbus, United States10001+Energy, Infrastructure
Growth EquityTotal funding$2.8BJan 2025
4
Base Power

Home battery and energy company that provides distributed power storage to reinforce the electric...

Austin, United States51–200Clean Energy, Clean Tech
Series DTotal funding$2.3BAug 2026
5
SVOLT

SVOLT Energy Technology is a global manufacturer of battery cells, modules, and energy storage sy...

Changzhou, China10001+Climate Tech, Automotive
Series BTotal funding$1.6BFeb 2021
6
TAE Technologies

TAE Technologies is a fusion power company developing the most sustainable and economically compe...

Foothill Ranch, United States201–500Energy, Deep Tech
Corporate RoundTotal funding$1.5BDec 2025
7
Helion

Nuclear fusion energy company building the world's first commercial fusion power plant; has a 50 ...

Everett, United States201–500Clean Energy, Climate Tech
Series G+Total funding$1.5BJun 2026
8
Slate Auto

Slate makes affordable electric pickup trucks that owners can customize and reconfigure as their ...

Troy, United States201–500Energy, Electric Vehicles
Series CTotal funding$1.4BApr 2026
9
Avaada

Avaada manufactures high-efficiency solar photovoltaic modules and develops green hydrogen, green...

Mumbai, India5001–10000Clean Energy, Energy
Growth EquityTotal funding$1.3BJun 2023
10
Actis Energy 3C Sub-Feeder

The team has built the Actis Energy 3 (AE3) fund to invest in electricity generation and distribu...

London, United Kingdom201–500Energy, Infrastructure
Growth EquityTotal funding$1.1BSep 2013
11
VoltaGrid

VoltaGrid delivers firm, off-grid power, fuel, infrastructure, and energy management services to ...

Houston, United States201–500Climate Tech, Energy
Growth EquityTotal funding$1.1BMay 2026
12
Kraken Technologies

AI-powered operating system for energy, water, and telecom utilities that provides customer manag...

London, United Kingdom1001–5000Energy, Artificial Intelligence
Growth EquityTotal funding$1.0BDec 2025
13
Twelve

Carbon transformation company that converts CO2 into essential products like sustainable aviation...

Berkeley, United States201–500Carbon Capture, Clean Tech
Series CTotal funding$936.4MDec 2025
14
Pacific Fusion

Pacific Fusion was founded in 2023 to develop pulsed magnetic inertial fusion for abundant, affor...

Fremont, United States51–200Energy
Series ATotal funding$900.0MOct 2024
15
Multiverse Computing

Multiverse Computing develops AI model-compression software that lets organizations deploy effici...

Tokyo, Spain51–200Energy
Series CTotal funding$823.2MJul 2026
16
Nexamp
Boston, United States201–500Clean Energy, Energy
Venture RoundTotal funding$766.5MApr 2024
17
Rigup

Source-to-pay platform for energy companies, combining software and services to manage vendors, w...

Austin, United States501–1000Energy, HR Tech
Series ETotal funding$678.6MMay 2021
18
Antares Industries

Antares Nuclear builds factory-produced fission microreactors that supply 100kWe to 1MWe of strat...

Los Angeles, United States51–200Defense Tech, Energy
Series CTotal funding$675.0MJul 2026
19
Aspen Power

Solar developer that provides landowners and businesses guaranteed long-term lease payments to ho...

New York, United States51–200Clean Energy, Energy
Venture RoundTotal funding$670.0MJan 2026
20
Mainspring Energy

Developer of linear generator technology providing flexible, fuel-agnostic onsite power generatio...

Menlo Park, United States51–200Energy, Climate Tech
Series FTotal funding$643.0MApr 2025
21
Electric Hydrogen

Manufacturer of high-power PEM electrolyzers that produce the lowest-cost green hydrogen for indu...

Devens, United States201–500Climate Tech, Energy
Series CTotal funding$602.0MOct 2023
22
Workrise

Source-to-pay platform and staffing vendor network that helps energy companies find, onboard, and...

Austin, United States501–1000Energy, HR Tech
Series ETotal funding$600.0MMay 2021
23
ABB E-Mobility

EV charging solutions provider powering CPOs, public transit systems, logistics fleets, and retai...

Zurich, Switzerland1001–5000Climate Tech, Automation
Venture RoundTotal funding$567.0MFeb 2023
24
General Matter

General Matter develops scalable, cost-competitive uranium enrichment technology to strengthen do...

San Francisco, United States1–10Energy, Infrastructure
Venture RoundTotal funding$550.0MMar 2026
25
FLO

EV charging network and station provider for home, commercial, and fleet use across North America.

Montreal, Canada201–500Electric Vehicles, Energy
Series ETotal funding$536.0MJun 2024