69 Best Nuclear Power Startups to Watch in 2025

The Definitive Seedtable Ranking of Nuclear 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 506 start-ups with an aggregate funding of $11.7b. The average funding per company in this subset is $169.7m.

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

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Helion Energy logo

Helion Energy

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

6

Funding Rounds

$577.8m

Money raised

Commonwealth Fusion Systems logo

Commonwealth Fusion Systems

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

5

Funding Rounds

$2.1b

Money raised

South Pole (company) logo

South Pole (company)

South Pole is a Zurich-based climate solutions company offering sustainable project development services in order to provide carbon offset credits to businesses and organizations.

1

Funding Rounds

First Light Fusion logo

First Light Fusion

First Light Fusion is a clean energy producer founded in 2011 by Nicholas Hawker.

7

Funding Rounds

$185.0m

Money raised

Legacy (company) logo

Legacy (company)

A digital fertility clinic offering semen analysis, sperm improvement, and sperm cryostorage services. Founded at Harvard in 2018, the company has raised $20M from investors like Y Combinator, Bain Capital Ventures, FirstMark Capital, and celebrities like Justin Bieber.

4

Funding Rounds

$6.5m

Money raised

Arundo Analytics logo

Arundo Analytics

Arundo provides software to enable advanced analytics in industrial companies. Arundo's customers transform their businesses through predictive analytics, deeper understanding of physical operations, and data-driven SaaS applications.

5

Funding Rounds

$73.7m

Money raised

Climeworks logo

Climeworks

Climeworks is a clean technology company that has developed technology for carbon dioxide (CO2) capture from ambient air. It was founded in 2009 and is located in Zurich, Switzerland.

10

Funding Rounds

$876.0m

Money raised

Tesseract logo

Tesseract

Tesseract is a diversified financial services and investment management innovator in digital assets, powered by world-class technology.

3

Funding Rounds

$206.0m

Money raised

emitWise logo

emitWise

EmitWise helps large businesses monitor and reduce their carbon footprints.

7

Funding Rounds

$39.7m

Money raised

LeadCold logo

LeadCold

LeadCold is a company developing lead-cooled small nuclear reactor technology founded in 2013 by Janne Wallenius, Jesper Ejenstam and Peter Szakalos.

2

Funding Rounds

$21.1m

Money raised

Terrestrial Energy logo

Terrestrial Energy

Terrestrial Energy is developing molten salt nuclear reactors.

5

Funding Rounds

$40.7m

Money raised

Aerones logo

Aerones

Aerones is a company building heavy-lift drones founded in 2015 by Janis Putrams.

3

Funding Rounds

$19.6m

Money raised

Exagen Diagnostics logo

Exagen Diagnostics

A diagnostics company developing products for diagnosis, prognosis and monitoring of patients with autoimmune rheumatic diseases

3

Funding Rounds

$37.4m

Money raised

Tokamak Energy logo

Tokamak Energy

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

7

Funding Rounds

$172.1m

Money raised

Renaissance Fusion logo

Renaissance Fusion

Nuclear fusion start-up in Europe researching high-temperature superconductors to simplify the construction of Stellarator devices as well as other applications in medical imaging.

1

Funding Rounds

$16.0m

Money raised

Zap Energy logo

Zap Energy

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

7

Funding Rounds

$332.8m

Money raised

Puraffinity Ltd logo

Puraffinity Ltd

Puraffinity is a company using customized granular media (CGM) to remove pollutants and contaminants from water supplies.

5

Funding Rounds

$9.1m

Money raised

Kiutra logo

Kiutra

A company developing cryogenic cooling solutions for research, material science, quantum computing, high-performance electronics, and detector applications.

2

Funding Rounds

HelicitySpace logo

HelicitySpace

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

1

Funding Rounds

$150.0k

Money raised

Gen4 Energy logo

Gen4 Energy

A company that was developing an advanced technology mini nuclear reactor, based on intellectual property developed by scientists at Los Alamos National Laboratory. It was located in Denver, Colorado.

2

Funding Rounds

$12.9m

Money raised

Soletair Power logo

Soletair Power

Modular direct air capture system that uses buildings' ventilation to remove carbon dioxide from the air.

2

Funding Rounds

$1.8m

Money raised

Moltex Energy logo

Moltex Energy

A nuclear energy company making a stable salt reactor.

1

Funding Rounds

$7.5m

Money raised

Marvel Fusion logo

Marvel Fusion

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.

2

Funding Rounds

$39.0m

Money raised

Klima logo

Klima

Klima is a climate app that empowers everyone to take effective, immediate climate action.

6

Funding Rounds

$40.2m

Money raised

Transatomic Power logo

Transatomic Power

A nuclear reactor design company developing Waste-Annihilating Molten Salt Reactor. The company ceased operations in September 2018.

1

Funding Rounds

$763.0k

Money raised

Pexapark AG logo

Pexapark AG

Pexapark AG is a blockchain company founded in 2017 by Michael Waldner, Florian Müller and Luca Pedretti.

10

Funding Rounds

$64.5m

Money raised

Ontario Power Generation logo

Ontario Power Generation

Ontario’s largest clean electricity generator, Ontario Power Generation produces about half of the province’s power using a diverse portfolio of publically-owned generating assets.

1

Funding Rounds

Cognite logo

Cognite

Cognite is an industrial software company headquartered in Oslo, Norway, that creates software for oil and gas, power and utilities, renewable energy, manufacturing and other asset-heavy industries.

7

Funding Rounds

$1.1b

Money raised

Octopus Energy logo

Octopus Energy

Octopus Energy is a company that offers retail electricity and gas supplies, and specializes in sustainable energy.

6

Funding Rounds

$2.1b

Money raised

Horne Technologies logo

Horne Technologies

Company that has developed and operates the world's first continuous-operation enabled, superconducting, high-beta style fusion research device.

1

Funding Rounds

$3.1m

Money raised

FlexiDAO logo

FlexiDAO

FlexiDAO is a blockchain company founded by Simone Accornero in 2017.

3

Funding Rounds

$13.0m

Money raised

KiteKRAFT logo

KiteKRAFT

A technology company developing a tethered electric aircraft to produce energy from the wind.

5

Funding Rounds

$6.6m

Money raised

Sono Motors logo

Sono Motors

Sono Motors is a car company manufacturing solar electric vehicles founded in 2016 by Jona Christians, Laurin Hahn and Navina Pernsteiner.

12

Funding Rounds

$200.8m

Money raised

Ostrom logo

Ostrom

We make energy fair, smart and green - one flexible monthly plan with no hidden fees, digital-first and 100% renewable energy.

3

Funding Rounds

$22.9m

Money raised

Bonnet logo

Bonnet

Bonnet is a company developing an app that acts as one subscription for all EV charging networks.

1

Funding Rounds

$1.2m

Money raised

Enapter logo

Enapter

Enapter is a company that designs and manufactures hydrogen generators.

9

Funding Rounds

$128.3m

Money raised

Highview Power logo

Highview Power

Highview Power is a company that provides CRYOBattery which delivers a clean and long-duration energy storage to enable a 100% renewable energy future.

6

Funding Rounds

$465.8m

Money raised

tado° logo

tado°

Tado° is a Munich, Germany-based manufacturer of thermostats and mobile applications that adjust to the real-time behavior of residents in private homes and small businesses for greater energy efficiency.

3

Funding Rounds

$147.0m

Money raised

Zolar logo

Zolar

Zolar is a photovoltaic solar manufacturer founded in 2016 by Gregor Loukidis.

8

Funding Rounds

$269.8m

Money raised

Zola Electric logo

Zola Electric

ZOLA Electric designs, manufactures, installs and sells solar backed systems for homes mainly in the rural and off-grid areas in Africa.

11

Funding Rounds

$278.0m

Money raised

Perceptual Robotics (company) logo

Perceptual Robotics (company)

Perceptual Robotics is an industrial automation company based in Bristol.

5

Funding Rounds

$3.7m

Money raised

CorPower Ocean logo

CorPower Ocean

CorPower Ocean is a wave energy converter solutions provider founded in 2012 by Patrik Möller .

8

Funding Rounds

$73.3m

Money raised

Fusion Energy Solutions logo

Fusion Energy Solutions

A nuclear fusion research company based in Tempe, Arizona.

1

Funding Rounds

$3.0m

Money raised

Arizona Public Service logo

Arizona Public Service

Arizona Public Service is an electric utility company in Arizona founded in 1886.

1

Funding Rounds

$70.5m

Money raised

Circularise logo

Circularise

Circularise is a Netherlands-based company helping plastic manufacturers, brands, and original equipment manufacturers (OEMs) to trace raw materials from source, into parts, and ultimately to end products, using blockchain and other innovative technologies.

1

Funding Rounds

$12.8m

Money raised

TAE Technologies, Inc. logo

TAE Technologies, Inc.

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

11

Funding Rounds

$1.2b

Money raised

eSmart Systems logo

eSmart Systems

AI-driven solutions provider for inspection and maintenance of critical energy infrastructure

4

Funding Rounds

$119.4m

Money raised

Brill Power Limited logo

Brill Power Limited

Brill Power Limited is a company that develops intelligent battery management systems and technology to enhance the lifetime, performance and safety of lithium-ion battery packs.

2

Funding Rounds

$11.1m

Money raised

Cervest logo

Cervest

Cervest is building an AI platform to augment human decisions on Climate Security for global assets.

7

Funding Rounds

$109.4m

Money raised

CollectiveCrunch logo

CollectiveCrunch

CollectiveCrunch uses artificial intelligence in the forest industry that collects data for precise models.

5

Funding Rounds

$3.7m

Money raised

Mootral logo

Mootral

Mootral develops carbon reduction solutions for companies and governments. Its first solution is a natural feed supplement that significantly reduces methane emissions from ruminants.

5

Funding Rounds

$10.8m

Money raised

Kraftblock logo

Kraftblock

Kraftblock provides an eco-friendly, modular thermal energy storage system.

5

Funding Rounds

$53.5m

Money raised

Glint Solar logo

Glint Solar

Glint Solar is a solar developer software provider founded in 2020 by Harald Olderheim , Even Kvelland and John Modin.

3

Funding Rounds

$11.1m

Money raised

Orbisk logo

Orbisk

Orbisk delivers innovative solutions for the world food system to reduce food waste.

5

Funding Rounds

$3.0m

Money raised

Bloom Biorenewables logo

Bloom Biorenewables

Bloom Biorenewables is making biomass a true alternative to petroleum.

8

Funding Rounds

$3.4m

Money raised

CELLUGY logo

CELLUGY

Biotechnology startup creating sustainable materials using natural resources.

2

Funding Rounds

$5.7m

Money raised

Fastned logo

Fastned

Operator of fast-charging stations for EVs powered by renewable energy from the sun and wind.

8

Funding Rounds

$65.5m

Money raised

Nordex logo

Nordex

Nordex is a Hamburg-based company operating wind power farms.

1

Funding Rounds

$86.5m

Money raised

Sympower logo

Sympower

Sympower is an Amsterdam-based provider of software solutions for the energy industry to increase energy efficiency of renewable energy.

5

Funding Rounds

$27.5m

Money raised

Eliq logo

Eliq

Eliq is a Swedish tech company that specializes in the analysis and visualization of energy data.

5

Funding Rounds

$22.3m

Money raised

OpenSensors logo

OpenSensors

Platform for creating a people-centric connected world using internet of things technology.

5

Funding Rounds

$8.1m

Money raised

Shayp logo

Shayp

Platform for automatic water leak detection and remote water consumption tracking in private and public buildings.

3

Funding Rounds

$4.9m

Money raised

Naked energy logo

Naked energy

Hybrid solar technology generating combined heat and power.

2

Funding Rounds

$29.3m

Money raised

Chaddenwych Services Limited logo

Chaddenwych Services Limited

Chaddenwych Services Limited is a London-based software and blockchain technology company founded in 2015.

10

Funding Rounds

$7.0m

Money raised

GreenCom Networks logo

GreenCom Networks

GreenCom Networks is a Munich-based software company developing white-label solutions for the utility and energy service industry.

4

Funding Rounds

$15.0m

Money raised

KOMP-ACT logo

KOMP-ACT

Electric motion technology that powers industrial automation for a carbon-neutral future.

11

Funding Rounds

$1.3m

Money raised

Abatable logo

Abatable

Abatable is a London-based environmental technology company developing voluntary carbon offsets for companies.

2

Funding Rounds

$17.0m

Money raised

Bioo logo

Bioo

Bioo is dedicated to the generation of electricity from nature through singular technologies and patents of its own. The company's business model is based on the development of the R&D, and the design and distribution of sustainable products and proprietary technologies, including the production of electricity through photosynthesis.

1

Funding Rounds

$2.3m

Money raised

Daphne Technology logo

Daphne Technology

Daphne Technology is an air emissions control system founded in 2017 by Juan Mario Michan.

4

Funding Rounds

$23.5m

Money raised