69 Best Energy Nuclear Startups in London to Watch in 2025

The Definitive Seedtable Ranking of Energy Nuclear Startups in London

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 85 start-ups with an aggregate funding of $4.6b. The average funding per company in this subset is $66.8m.

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.

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:

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:

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

$1.2m

Money raised

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

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.

1

Funding Rounds

$7.2m

Money raised

A financial technology company offering a household bill payment platform.

7

Funding Rounds

$109.4m

Money raised

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

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:

2

Funding Rounds

$29.3m

Money raised

Hybrid solar technology generating combined heat and power.

Location:

Key people:

5

Funding Rounds

$8.1m

Money raised

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

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.

Location:

Key people:

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:

$100.0k

Money raised

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

Location:

Key people:

3

Funding Rounds

$54.6m

Money raised

ev.energy is a smart EV charging software platform founded in 2018 by Nick Woolley.

Location:

Key people:

1

Funding Rounds

$8.2m

Money raised

Platform helping the food sector reduce its carbon footprint.

3

Funding Rounds

$9.3m

Money raised

Carbon capture technology that reduces industrial CO2 emissions.

Location:

Key people:

1

Funding Rounds

$5.0m

Money raised

Thallo is a carbon credit marketplace powered by blockchain, where businesses and individuals can purchase high-quality carbon offsets.

1

Funding Rounds

$750.0k

Money raised

Green Running Ltd. develops energy reducing components.

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

$21.1m

Money raised

Provider of hardware and software solutions for smart electricity grids.

Location:

Key people:

4

Funding Rounds

$32.0m

Money raised

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

Key people:

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.

Location:

Key people:

1

Funding Rounds

$5.5m

Money raised

TrueCircle is building a marketplace to support waste processing facilities in selling the verified material they reclaim.

1

Funding Rounds

$2.0m

Money raised

Breathe Battery Technologies is a company founded in 2019. The company develops electric vehicle battery charging control software.

1

Funding Rounds

$7.8m

Money raised

Network connecting graduates, undergraduates, and professionals with suitable job opportunities.

Location:

Key people:

1

Funding Rounds

$320.0k

Money raised

BirdsEyeView harnesses high resolution sattelite imagery to provide farmers and agribusinesses with uncomplicated weather risk insurance.

3

Funding Rounds

$20.0m

Money raised

Tem. is an AI-powered renewable energy platform founded in 2021 by Joe McDonald, Ross Mackay, Bartlomiej Szostek and Jason Stocks.

Location:

Key people:

3

Funding Rounds

$584.5m

Money raised

Newcleo is a clean nuclear technology developer for sustainable energy founded in 2021 by Stefano Buono.

Location:

Key people:

2

Funding Rounds

$3.5m

Money raised

Energy optimisation platform for commercial buildings.

Location:

Key people:

2

Funding Rounds

$42.0m

Money raised

44.01 is a mineralisation technology developer founded in 2020 by Talal Hasan.

Location:

Key people:

1

Funding Rounds

$710.0k

Money raised

Global marketplace for visibility and connectivity for clean energy project developers, advisors, investors, and lenders.

1

Funding Rounds

$32.0m

Money raised

BeZero Carbon is a providers of carbon rating services founded in 2020 by Tommy Ricketts.

Location:

Key people:

1

Funding Rounds

$170.0m

Money raised

Solution to prevent plastic pollution globally and sustainably.

1

Funding Rounds

$18.0m

Money raised

Software enabling enterprise to automate sustainability data measurement, management and exchange - with unparalleled accuracy and ease.

1

Funding Rounds

$640.0k

Money raised

Airex is a smart ventilation control that builds intelligent air ventilation units using atmospheric sensors and cloud algorithms.

4

Funding Rounds

$401.7k

Money raised

SMAP Energy is a company founded in 2016.

2

Funding Rounds

$965.5k

Money raised

Platform providing companies with tools to lead in combating climate change.

1

Funding Rounds

$44.0m

Money raised

Char.gy is a public charge point operator for electric vehicles founded in 2016 by Richard Stobart.

1

Funding Rounds

$9.0m

Money raised

Nous is a software managing household utilities founded in 2021 by Todd Zino.

4

Funding Rounds

$39.7m

Money raised

Satellite Vu is a thermal imaging startup founded in 2016.

1

Funding Rounds

$7.6m

Money raised

Renewable biofuels producer from landfill gases.

Location:

2

Funding Rounds

$3.4m

Money raised

AI powered Enterprise Net Zero Intelligence Platform - Helping enterprises to digitize and accelerate their net zero journey

2

Funding Rounds

$1.3m

Money raised

Boldr is a home energy management platform founded in 2022.

5

Funding Rounds

$2.2m

Money raised

Renovagen is a London-based company founded in 2012 by John Hingley.

2

Funding Rounds

$98.0m

Money raised

Fuse Energy is a renewable energy producer founded in 2022 by Charles Orr.

Location:

Key people:

3

Funding Rounds

$1.6m

Money raised

Quimera Energy Efficiency is a company founded in 2015.

1

Funding Rounds

$3.2m

Money raised

Axle Energy is a flexible energy software platform founded in 2023.

1

Funding Rounds

$1.8m

Money raised

Barocal Ltd is developing new heating and cooling technologies to satisfy low-carbon requirements.

1

Funding Rounds

$32.3m

Money raised

Provider of electric vehicle fleet and battery storage services.

Location:

1

Funding Rounds

$18.0m

Money raised

Supercritical is a green hydrogen production technology developer founded in 2020 by Luke Tan, Matt Bird and Mike Russ.

Location:

Key people:

1

Funding Rounds

$1.5m

Money raised

Porpoise Power is a developer of tidal energy technology founded in 2024 by John Kennedy, Adrian Thomas, Hilary Struthers and Martin Hall.

Key people:

1

Funding Rounds

$53.0m

Money raised

Your Energy, an investment by Mistral Energy I LP., is an independent UK based renewable energy company established in 2001. Services include planning, environmental services, wind turbine technology, contract law and project financing.

1

Funding Rounds

$1.6m

Money raised

ChargedUp is a company founded by Forrest Skerman-Stevenson, Hakeem Buge and Hugo Tilmouth.

Location:

Key people:

1

Funding Rounds

$3.3m

Money raised

Powering mega-buildings and homes with clean energy generated on-site using new thin-film solar, overcoming weight and aesthetic challenges.

2

Funding Rounds

$5.7m

Money raised

ML technology to plan and operationalize Sustainability & Net Zero Carbon ambitions; balancing People, Planet & Profit.

1

Funding Rounds

$8.0m

Money raised

Sterecycle is a waste management company specialising in advanced systems for the treatment of municipal wastes and the conversion of the organic portion into a renewable energy biomass.

1

Funding Rounds

$1.6m

Money raised

B2B Marketplace for construction waste, bulky materials and equipment hire.

1

Funding Rounds

$10.0m

Money raised

Piclo is an OS for electricity grids founded in 2013.

1

Funding Rounds

$870.0k

Money raised

Platform for managing decarbonization in large enterprises and heavy industries.

1

Funding Rounds

$19.0m

Money raised

Polymateria is a London-based startup advancing science to help nature deal with plastic pollution.

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