68 Best Climate Tech Green Tech Startups in London to Watch in 2025

The Definitive Seedtable Ranking of Climate Tech Green Tech 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 174 start-ups with an aggregate funding of $5.2b. The average funding per company in this subset is $76.5m.

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

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3

Funding Rounds

Carbon Analytics provides a SaaS platform solution designed to assess carbon emissions in companies' supply chains and generate actionable data that can be used to reduce emissions.

1

Funding Rounds

$2.5m

Money raised

Toast Ale is a London-based brewery using surplus fresh bread to brew beer and dedicating their profits to charities working to create greater efficiency in the food supply system.

3

Funding Rounds

$80.7m

Money raised

ZeroAvia is an aerospace company developing practical zero emission aviation powertrains using hydrogen power.

3

Funding Rounds

$5.3m

Money raised

Minimum is a carbon tracking and carbon offsetting company

Location:

Key people:

7

Funding Rounds

$39.7m

Money raised

EmitWise helps large businesses monitor and reduce their carbon footprints.

4

Funding Rounds

$95.9m

Money raised

Olio is a London-based sharing company working to solve the problem of food waste and hunger.

Location:

1

Funding Rounds

$2.9m

Money raised

Stuffstr is a London-based recommerce technology company, founded by John Atcheson in 2014.

Key people:

1

Funding Rounds

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

3

Funding Rounds

$10.3m

Money raised

CarbonChain aims to automate the accounting of companies' carbon emissions.

Location:

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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:

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5

Funding Rounds

$125.8m

Money raised

AllPlants is a VC-backed B-Corp on a mission to become Earth's most forward-thinking food company.

5

Funding Rounds

$32.7m

Money raised

PhaseCraft is company that is developing fundamental quantum theory and software for quantum computers.

Location:

Key people:

1

Funding Rounds

$3.0m

Money raised

FashionTech company using Artificial Intelligence for wardrobe management

Location:

Key people:

2

Funding Rounds

$64.0m

Money raised

Circular Economy improves supply chains transparency by verifying responsible sourcing, effective recycling and by attributing CO2 footprint and other impact metrics to materials flows.

Location:

Key people:

1

Funding Rounds

$2.7m

Money raised

Holy Grail is focused on the development of autonomous research systems dedicated to material science and chemistry with the goal of replacing the use of fossil fuels with electro-chemical battery solutions.

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:

4

Funding Rounds

$442.0m

Money raised

Arrival is a London based company developing and manufacturing zero-emission, public transportation vehicles.

Location:

Key people:

7

Funding Rounds

$73.0m

Money raised

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

Location:

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4

Funding Rounds

$4.9m

Money raised

Pynk is a company that provides a game-changing investment platform that is built for everyday 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.

1

Funding Rounds

$40.0k

Money raised

Aerial Power is a London-based company founded by Ridha Azaiz.

Location:

Key people:

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.

3

Funding Rounds

$10.8m

Money raised

Climate data intelligence platform for businesses.

7

Funding Rounds

$109.4m

Money raised

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

4

Funding Rounds

$38.8m

Money raised

Winnow Solutions is a company founded in 2013.

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:

7

Funding Rounds

$358.0m

Money raised

Operator of an online car auction platform designed to facilitate the sale of used cars.

6

Funding Rounds

$35.5m

Money raised

Greyparrot use deep learning and computer vision to accurately classify different types of waste materials.

Location:

Key people:

1

Funding Rounds

$4.5m

Money raised

Pledge is a software development company providing tools and infrastructure to automate the delivery of climate solutions.

4

Funding Rounds

$32.6m

Money raised

Humanising Autonomy is building the global standard for human machine interactions.

Location:

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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

$110.0m

Money raised

ESG Book is a global leader in sustainability data and technology, trusted by many of the world's largest financial organisations.

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.

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:

3

Funding Rounds

$45.0m

Money raised

Notpla is a plastic-free packaging solutions provider founded in 2014 by Pierre Paslier.

Location:

Key people:

3

Funding Rounds

$40.3m

Money raised

AI-designed enzyme producer to transform plastic waste into valuable resources.

Location:

Key people:

3

Funding Rounds

$23.4m

Money raised

Recycleye Ltd is an AI-automated waste management founded in 2019.

$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:

6

Funding Rounds

$40.3m

Money raised

This is a vegan food company making plant-based meat-alternative products founded in 2018.

1

Funding Rounds

$410.0k

Money raised

Quirk is the first personal finance app that uses personality and psychometric testing to help young adults adopt better financial behaviours.

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:

2

Funding Rounds

$10.4m

Money raised

An automated factory producing insect protein for farm animals

2

Funding Rounds

$6.0m

Money raised

Analytics to maximise environmental and social investment returns

1

Funding Rounds

$17.6m

Money raised

Hummingbird is a drone and satellite enabled imagery analytics business for precision agriculture.

Location:

4

Funding Rounds

$57.7m

Money raised

Again provides supply chain infrastructure for circular packaging.

1

Funding Rounds

$110.0m

Money raised

Tala is a London-based company founded in 2015.

1

Funding Rounds

$2.0m

Money raised

ObjectBox is a company founded in 2015 by Vivien Dollinger.

Key people:

3

Funding Rounds

$11.5m

Money raised

Hometree is a residential energy services provider founded in 2015 by Simon Phelan .

Location:

Key people:

1

Funding Rounds

$8.2m

Money raised

Platform helping the food sector reduce its carbon footprint.

1

Funding Rounds

$8.0m

Money raised

A global leader in low-cost CO2 capture technology and is headquartered in London and operates offices in India, Spain, and the United States.

Key people:

3

Funding Rounds

$9.3m

Money raised

Carbon capture technology that reduces industrial CO2 emissions.

Location:

Key people:

2

Funding Rounds

$58.7k

Money raised

DESOLENATOR is a London-based solar-powered desalination and water purification technology developer.

Location:

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Made with naturally plant-based ingredients like fermented legumes & slow roasted vegetables. Dairy-free vegan cheese, meat-free salami. Shop online for home delivery or find us at selected restaurants & retailers.

2

Funding Rounds

$12.4m

Money raised

Shellworks is on a mission to make plastic waste a thing of the past by creating truly compostable packaging solutions.

7

Funding Rounds

$24.5m

Money raised

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

5

Funding Rounds

$3.4m

Money raised

Developer of e-bikes. The company develops folding, chainless, electric bicycle compatible with smartphones.

Location:

Key people:

1

Funding Rounds

$35.0m

Money raised

Twig is a fintech that turn things into cash instantly.

3

Funding Rounds

$21.1m

Money raised

Provider of hardware and software solutions for smart electricity grids.

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4

Funding Rounds

$32.0m

Money raised

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

Key people:

1

Funding Rounds

$1.1m

Money raised

Easily measure and reduce your impact on the planet. Fight climate change.

1

Funding Rounds

$2.0m

Money raised

ADAY is a London-based company founded in 2015 by Nina Faulhaber.

Location:

Key people:

2

Funding Rounds

$90.0m

Money raised

An innovative settlement platform to facilitate reliable, secure, and scalable trading of high-integrity carbon credits.

Industries:

Location:

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.

2

Funding Rounds

$15.2m

Money raised

Cudoni is a second-hand luxury resale marketplace founded in 2017 by James Harford-Tyrer.

Location:

Key people:

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