69 Best Energy Nuclear Startups in Uk to Watch in 2025

The Definitive Seedtable Ranking of Energy Nuclear Startups in Uk

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 119 start-ups with an aggregate funding of $7.0b. The average funding per company in this subset is $101.8m.

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

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7

Funding Rounds

$39.7m

Money raised

EmitWise helps large businesses monitor and reduce their carbon footprints.

5

Funding Rounds

$40.7m

Money raised

Terrestrial Energy is developing molten salt nuclear reactors.

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:

1

Funding Rounds

Pavegen is a London-based company founded by Laurence Kemball-Cook.

5

Funding Rounds

$9.1m

Money raised

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

Location:

Key people:

5

Funding Rounds

$225.0m

Money raised

A biotechnology company that specialized in the renewable energy sector. It was located in Bedford, Massachusetts and is no longer in operation.

Key people:

9

Funding Rounds

$138.9m

Money raised

SkySpecs is a company founded in 2012 by Daniel Ellis.

12

Funding Rounds

$187.2m

Money raised

Oxford PV is a London-based developer of perovskite thin-film solar cells.

1

Funding Rounds

$3.8m

Money raised

Go Eve is an innovations to accelerate the transition to EVs founded in 2021 by Robert Shorten.

Location:

Key people:

7

Funding Rounds

$1.1b

Money raised

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.

6

Funding Rounds

$2.1b

Money raised

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

Location:

Key people:

7

Funding Rounds

$73.0m

Money raised

Addionics is creating next-generation batteries through intelligent 3D battery architecture and engineering.

Location:

Key people:

1

Funding Rounds

$15.4m

Money raised

A biotechnology company using microbiology and chemistry to produce consumer goods and industrial products.

1

Funding Rounds

$32.0m

Money raised

Primus Power is an Hayward, California-based zinc bromine flow battery manufacturer.

1

Funding Rounds

$1.2m

Money raised

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

1

Funding Rounds

$784.0k

Money raised

British company serving the defence, security, transport and energy industries

10

Funding Rounds

$182.1m

Money raised

Echion Technologies is a supplier of niobium-based anode materials founded in 2017 by Jean de La Verpillière, Alex Groombridge, Adam Boies and Michael De Volder.

5

Funding Rounds

$27.1m

Money raised

Qio Technologies Limited is a company providing digital twin solutions for industries, including their QiO Foresight Platform which unites energy, maintenance, production, and performance applications.

6

Funding Rounds

$465.8m

Money raised

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

5

Funding Rounds

$3.7m

Money raised

Perceptual Robotics is an industrial automation company based in Bristol.

Location:

Key people:

1

Funding Rounds

$7.2m

Money raised

A financial technology company offering a household bill payment platform.

1

Funding Rounds

$21.0m

Money raised

Intelligent Energy is a fuel cell engineering company focused on the development of its fuel cell technologies.

2

Funding Rounds

$11.1m

Money raised

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.

Location:

Key people:

7

Funding Rounds

$109.4m

Money raised

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

1

Funding Rounds

$4.0m

Money raised

Engergi Mine is a reward platform that is designed to help reduce global energy demand.

11

Funding Rounds

$12.1m

Money raised

Electron is an Entech company that is aiding the transition to Net Zero. Electron offers transformative solutions that are available to all energy market participants.

Location:

Key people:

9

Funding Rounds

$140.6m

Money raised

Carbon Clean Solutions is a London-based carbon capture and storage company developing CO2 separation technology for industrial and gas treating applications.

Location:

Key people:

10

Funding Rounds

$17.1m

Money raised

Piclo is a software company that is building smart energy for the future.

Location:

Key people:

3

Funding Rounds

$40.6m

Money raised

Developer of an energy storage technology designed to fight climate change using carbon dioxide (CO2) to accelerate the transition to renewable energy. The company's technology is based on a thermodynamic transformation of CO2 a closed-loop process to store energy and make renewable power dispatchable.

Key people:

4

Funding Rounds

$9.8m

Money raised

Aceleron is a clean technology company that aims to empower global communities by increasing access to energy storage solutions for its customers.

9

Funding Rounds

$41.9m

Money raised

Econic Technologies is a company developing catalyst chemistry to turn waste carbon dioxide into economic and environmental products.

2

Funding Rounds

$29.3m

Money raised

Hybrid solar technology generating combined heat and power.

Location:

Key people:

2

Funding Rounds

$18.0m

Money raised

Sefaira is a London-based software company developing software for energy efficiency and management in buildings.

7

Funding Rounds

$144.7m

Money raised

Monta is a EV charging platform founded in 2020.

Location:

10

Funding Rounds

$7.0m

Money raised

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

Location:

Key people:

2

Funding Rounds

$17.0m

Money raised

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

Location:

Key people:

2

Funding Rounds

$12.6m

Money raised

Provider of sustainable on-demand laundry and cleaning services for everyone.

Location:

Key people:

5

Funding Rounds

$167.5m

Money raised

Malta Inc is a company storing renewable energy in molten salt founded by X.

7

Funding Rounds

$24.5m

Money raised

Invinity Energy Systems is a vanadium flow battery company.

2

Funding Rounds

$15.4m

Money raised

GridBeyond is a provider of wireless energy management and control systems for retail, commercial and industrial users.

$100.0k

Money raised

Altroleum is a company that offers a data platform for the energy transition, daily hydrogen cost assessments and more.

1

Funding Rounds

$200.0m

Money raised

Kpler is a fast-growing data & analytics firm on a mission to facilitate efficient and sustainable trade.

1

Funding Rounds

$4.5m

Money raised

Faradion Limited is a manufacuturer of eergy storage technologies.

1

Funding Rounds

$13.7m

Money raised

Anaphite is a dry-coating EV battery technology developer founded in 2016 by Alexander Hewitt.

Location:

Key people:

2

Funding Rounds

$15.3m

Money raised

Hyperdrive designs and develops lithium-ion battery systems.

1

Funding Rounds

Equiwatt Limited is an England-based company with an app and platform that help UK residents .

6

Funding Rounds

$200.0m

Money raised

Sweep is a developers of carbon emissions tracking software.

5

Funding Rounds

$41.2m

Money raised

Ilika is developing solid-state battery technology solutions for applications in IIoT, MedTech, Electric Vehicles, and Consumer Electronics.

1

Funding Rounds

$8.2m

Money raised

Platform helping the food sector reduce its carbon footprint.

2

Funding Rounds

$450.0m

Money raised

Microvast is a Huzhou-based electrical and electronic manufacturing company.

Key people:

3

Funding Rounds

$11.0m

Money raised

Rezatec is an artificial intelligence company developing geospatial artificial intelligence systems to help businesses manage ground-based assets and infrastructure remotely.

3

Funding Rounds

$5.8m

Money raised

Abundance Investment is a United Kingdom-based company founded in 2009 by Bruce Davis, Karl Harder and Louise Wilson.

3

Funding Rounds

$9.3m

Money raised

Carbon capture technology that reduces industrial CO2 emissions.

8

Funding Rounds

$3.6m

Money raised

Petalite is offering EV charging solutions to energy companies, charge point operators, and fleet management companies to help maximize their ROI potential and provide a competitive and reliable charging service for EV drivers.

1

Funding Rounds

$750.0k

Money raised

Green Running Ltd. develops energy reducing components.

Location:

Key people:

1

Funding Rounds

$1.4m

Money raised

FenestraPro is a Dublin-based company founded in 2012 by David Palmer, Simon Whelan and David Palmer.

Location:

Key people:

7

Funding Rounds

$24.5m

Money raised

Redt Energy Plc, now known as Invinity Energy Systems PLC, is a vanadium flow battery company.

3

Funding Rounds

$7.0m

Money raised

Cheesecake Energy Ltd (CEL) has developed a sustainable energy storage technology to support the charging of electric vehicles and allowing for deeper integration of renewable energy such as solar at a lower cost than market-leading alternatives.

3

Funding Rounds

$40.2m

Money raised

Cambridge Semiconductor Limited is a Cambridge, Cambridgeshire-based company founded in 2002.

3

Funding Rounds

$21.1m

Money raised

Provider of hardware and software solutions for smart electricity grids.

Location:

Key people:

1

Funding Rounds

Simple public electric vehicle charging with an electric fuel card & mobile app for business

3

Funding Rounds

$33.9m

Money raised

Platform providing data, research, and benchmarking tools for energy storage analysis.

4

Funding Rounds

$32.0m

Money raised

Singularity University London is an artificial Intelligence company founded in 2008 by Rob Nail.

Key people:

2

Funding Rounds

$64.0m

Money raised

Exergyn is a CLEANER WORLD powered by Exergyn founded in 2012 by Alan Healy.

Key people:

7

Funding Rounds

$25.6m

Money raised

ZapGo Ltd. is a company founded in Oxford, UK.

4

Funding Rounds

$5.8m

Money raised

SEaB Energy is a company that provides small waste-to-energy products.

Location:

Key people:

1

Funding Rounds

$910.0k

Money raised

eleXsys Energy operates as a cleantech energy company.

4

Funding Rounds

$102.9m

Money raised

BBOXX is a London-based designer, manufacturer and distributor of plug and play solar panels and systems.

2

Funding Rounds

$17.8m

Money raised

Moment Energy is a start-up striving to provide greater access to renewable and reliable energy storage.

Key people:

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