11 Best Fusion Power Startups to Watch in 2025

The Definitive Seedtable Ranking of Fusion Power Startups

We track 71,000+ companies and rank them dynamically using our Seedtable Score – a score that uses quantitative and qualitative data points to signal the momentum behind a company. We then monitor the list manually leveraging our expertise as founders and investors.

There are 12 start-ups with an aggregate funding of $4.6b. The average funding per company in this subset is $414.9m.

Last update to the database: Feb 18, 2025. See changelog.

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6

Funding Rounds

$577.8m

Money raised

Helion Energy is a fusion power company aiming to build the world's first fusion power plant.

Key people:

5

Funding Rounds

$2.1b

Money raised

Commonwealth Fusion Systems is a Cambridge, Massachusetts-based research and development company developing fusion power systems based on ARC tokamak reactors.

2

Funding Rounds

$5.0m

Money raised

Avalanche Energy Designs is an American start-up company designing, testing, and building micro-fusion reactors.

Location:

Key people:

2

Funding Rounds

$49.2m

Money raised

Renaissance Fusion is a nuclear fusion reactor manufacturer founded in 2020 by Francesco A Volpe.

Location:

Key people:

7

Funding Rounds

$172.1m

Money raised

Tokamak Energy is a fusion energy producer founded in 2009 by Alan Sykes, David Kingham and Mikhail Gryaznevich.

Key people:

7

Funding Rounds

$332.8m

Money raised

Zap Energy is developing compact fusion power that doesn't require magnets or lasers.

1

Funding Rounds

$150.0k

Money raised

HelicitySpace is a fusion propulsion and power company, developing technology for spacecraft.

Key people:

2

Funding Rounds

$39.0m

Money raised

A company developing its own petawatt class and high energy laser system coupled with a sophisticated target physics infrastructure exclusively dedicated to commercial "neutron-lean" fusion energy.

1

Funding Rounds

$3.0m

Money raised

A nuclear fusion research company based in Tempe, Arizona.

11

Funding Rounds

$1.2b

Money raised

TAE Technologies, Inc., formerly known as Tri Alpha Energy, is a California-based renewable energy company focused on developing commercial fusion energy.

1

Funding Rounds

$15.0m

Money raised

Industries:

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