Company lists · Data refreshed September 2026

Top 25 Cleantech accelerators based in the United Kingdom

Name: Cleantech accelerators based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 247 companies tracked

RevenueBase identified 247 cleantech accelerators headquartered in the United Kingdom as of September 2026 and tracks 1,754 professional contacts across them, including 636 with verified work emails. London is the largest hub.

This list covers cleantech accelerators headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

247Companies

1,754Contacts tracked

636Verified emails

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The 25 largest cleantech accelerators based in the United Kingdom

Ranked by team size

Top 25 of 247 cleantech accelerators based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to cleantech accelerators: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Ashden	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	76 contacts →
	Indirect evidence “Ashden's mission is to accelerate transformative climate solutions and build a more just world.” Source: RevenueBase Database · checked Sep 19, 2026
2	Pacific Green	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	63 contacts →
	Partial evidence “Pacific Green is becoming a world leader at providing sustainable cleantech solutions to help solve climate warming, green energy and resource scarcity challenges.” Source: RevenueBase Database · checked Sep 19, 2026
3	Storm4	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	56 contacts →
	Indirect evidence “Storm4 is a specialized executive search and recruiting firm helping America's energy and infrastructure companies hire the leaders and technical talent they need to grow.” Source: RevenueBase Database · checked Sep 19, 2026
4	Catagen Limited	Indirect evidence	Belfast, United KingdomHQ checked Sep 19, 2026	51-200	50 contacts →
	Indirect evidence “CATAGEN’s mission is to clean and decarbonise the air.” Source: RevenueBase Database · checked Sep 19, 2026
5	O.C.O Technology LTD	Indirect evidence	East Wretham, United KingdomHQ checked Sep 19, 2026	51-200	46 contacts →
	Indirect evidence “O.C.O are a global clean tech company transforming thermal residues which would otherwise go to landfill through an innovative carbon capture process which permanently stores…” Source: RevenueBase Database · checked Sep 19, 2026
6	Nova Pangaea Technologies	Partial evidence	Teeside, United KingdomHQ checked Sep 19, 2026	11-50	40 contacts →
	Partial evidence “Nova Pangaea Technologies is a cleantech company that has created a patented technology called REFNOVA®.” Source: RevenueBase Database · checked Sep 19, 2026
7	Altilium Clean Technology	Indirect evidence	England, United KingdomHQ checked Sep 19, 2026	11-50	36 contacts →
	Indirect evidence “Altilium is a UK based Clean Technology group decarbonising the electric vehicle supply chain and supporting the transformation of the global energy sector from fossil-based to…” Source: RevenueBase Database · checked Sep 19, 2026
8	Xfounders Accelerator	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	29 contacts →
	Partial evidence “Most accelerators offer calls, decks, and vague promises.” Source: RevenueBase Database · checked Sep 19, 2026
9	Caldera	Indirect evidence	Fareham, United KingdomHQ checked Sep 19, 2026	11-50	26 contacts →
	Indirect evidence “Caldera is here to make zero-carbon heat the norm.” Source: RevenueBase Database · checked Sep 19, 2026
10	Carbon Limiting Technologies	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “At CLT, we believe clean technology is essential to building a resilient, competitive, and sustainable economy.” Source: RevenueBase Database · checked Sep 19, 2026
11	Orbital Materials	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “Building novel solutions for clean air, water and energy with AI.” Source: RevenueBase Database · checked Sep 19, 2026
12	Rapid Innovation Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect evidence “Rapid Innovation Group (RIG) is a commercialisation firm focused on high impact industrial technologies that have a global application where defensibility is primarily based on…” Source: RevenueBase Database · checked Sep 19, 2026
13	XUM Enterprise LTD	Indirect evidence	Manchester, United KingdomHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “We challenge ourselves to- Protect the environment by finding new ways to decarbonise the semiconductor industry- Extend the life cycle of components as opposed to the traditional…” Source: RevenueBase Database · checked Sep 19, 2026
14	Transition Ventures	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	19 contacts →
	Indirect evidence “We back founders at pre-seed, seed and series A stages.” Source: RevenueBase Database · checked Sep 19, 2026
15	Science Creates	Indirect evidence	Bristol, United KingdomHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “Science Creates believes that Deep Tech startups are society's most effective economic vehicle to deliver innovation and global impact for the health of people and the health of…” Source: RevenueBase Database · checked Sep 19, 2026
16	London Greencity	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “A Collaboration Lab for Climate We built London GreenCity to offer a place for people building game changing hardware and software companies in London to find the tools, space…” Source: RevenueBase Database · checked Sep 19, 2026
17	Ineco Energy	Indirect evidence	Stoneleigh Park, United KingdomHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Guiding businesses in their clean energy transition, by providing the best energy technology that prioritizes self-sufficiency, economic responsibility, and environmental…” Source: RevenueBase Database · checked Sep 19, 2026
18	The Futurelist	Indirect evidence	United KingdomHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Our mission at The FutureList is to spotlight and connect groundbreaking tech startups, strategic capital and future-focused multinationals from all corners of the globe to make…” Source: RevenueBase Database · checked Sep 19, 2026
19	Ampyr Distributed Energy	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “At AMPYR Distributed Energy we design, build, own, and operate clean energy technologies that help our customers go green and reduce their energy costs.” Source: RevenueBase Database · checked Sep 19, 2026
20	Energy Revolution Ventures	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	15 contacts →
	Indirect evidence “Energy Revolution Ventures has established itself as one of the premier venture capital investors in pre-Seed, Seed & Series A+ start-ups, developing scalable technologies within…” Source: RevenueBase Database · checked Sep 19, 2026
21	Cambridge Cleantech	Partial evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	1-10	15 contacts →
	Partial evidence “As the UK’s leading cleantech innovation network, Cambridge Cleantech brings together innovators, investors, corporates, academics and the public sector to create a sustainable…” Source: RevenueBase Database · checked Sep 19, 2026
22	Becbc Limited	Indirect evidence	Workington, United KingdomHQ checked Sep 19, 2026	1-10	15 contacts →
	Indirect evidence “As the voice of the supply chain, this not for profit business cluster brings together businesses from across the world who support the clean energy industry and wider supply…” Source: RevenueBase Database · checked Sep 19, 2026
23	Central Research Laboratory	Partial evidence	Hayes, United KingdomHQ checked Sep 19, 2026	11-50	15 contacts →
	Partial evidence “Central Research Laboratory (CRL) is the UK's leading accelerator and coworking space for hardware startups and product pioneers.” Source: RevenueBase Database · checked Sep 19, 2026
24	Exergy3	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Exergy3 is clean-tech spinout from the University of Edinburgh.” Source: RevenueBase Database · checked Sep 19, 2026
25	A Healthier Earth	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “A Healthier Earth is a climate-tech catalyst delivering profitable, planet-positive projects at speed and scale.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: cleantech accelerators. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names cleantech accelerators.
Partial evidence: Its own public description names part of cleantech accelerators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cleantech accelerators. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 247 cleantech accelerators based in the United Kingdom

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Cleantech accelerators based in the United Kingdom at a glance

As of Sep 19, 2026

36.3%Verified-email coverage

7.1Average contacts per company

1-10Median size (employees)

52.2%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

178

11-50

51-200

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 247 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among cleantech accelerators, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “cleantech accelerators”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names cleantech accelerators), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among cleantech accelerators, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 636 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Cleantech accelerators by metro

Cleantech accelerators in London129

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names cleantech accelerators, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many cleantech accelerators are there based in the United Kingdom?

RevenueBase identified 247 cleantech accelerators headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Ashden, headquartered in London, tops this list with the largest team on record.

Which city has the most cleantech accelerators?

London leads with 129 headquartered companies, followed by Birmingham (4) and Cambridge (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 636 verified decision-maker contacts tracked across these 247 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.