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 company matches for cleantech accelerators associated with 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 company matches for cleantech accelerators associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 19, 2026 How this list was built

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 company matches for cleantech accelerators based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Ashden	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	76 contacts →
	Exact match “Ashden's mission is to accelerate transformative climate solutions and build a more just world.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Pacific Green	Exact match	London, United KingdomHQ recorded Sep 19, 2026	51-200	63 contacts →
	Exact match “Pacific Green is becoming a world leader at providing sustainable cleantech solutions to help solve climate warming, green energy and resource scarcity challenges.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	Storm4	Exact match	London, United KingdomHQ recorded Sep 19, 2026	51-200	56 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Catagen Limited	Exact match	Belfast, United KingdomHQ recorded Sep 19, 2026	51-200	50 contacts →
	Exact match “CATAGEN’s mission is to clean and decarbonise the air.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	O.C.O Technology LTD	Exact match	East Wretham, United KingdomHQ recorded Sep 19, 2026	51-200	46 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	Nova Pangaea Technologies	Exact match	Teeside, United KingdomHQ recorded Sep 19, 2026	11-50	40 contacts →
	Exact match “Nova Pangaea Technologies is a cleantech company that has created a patented technology called REFNOVA®.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	Altilium Clean Technology	Exact match	England, United KingdomHQ recorded Sep 19, 2026	11-50	36 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	Xfounders Accelerator	Exact match	London, United KingdomHQ recorded Sep 19, 2026	1-10	29 contacts →
	Exact match “Most accelerators offer calls, decks, and vague promises.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	Caldera	Exact match	Fareham, United KingdomHQ recorded Sep 19, 2026	11-50	26 contacts →
	Exact match “Caldera is here to make zero-carbon heat the norm.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	Carbon Limiting Technologies	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	24 contacts →
	Exact match “At CLT, we believe clean technology is essential to building a resilient, competitive, and sustainable economy.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	Orbital Materials	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	24 contacts →
	Exact match “Building novel solutions for clean air, water and energy with AI.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	Rapid Innovation Group	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	23 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	XUM Enterprise LTD	Exact match	Manchester, United KingdomHQ recorded Sep 19, 2026	11-50	22 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	Transition Ventures	Exact match	London, United KingdomHQ recorded Sep 19, 2026	1-10	19 contacts →
	Exact match “We back founders at pre-seed, seed and series A stages.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	Science Creates	Exact match	Bristol, United KingdomHQ recorded Sep 19, 2026	11-50	19 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	London Greencity	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	19 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	Ineco Energy	Exact match	Stoneleigh Park, United KingdomHQ recorded Sep 19, 2026	11-50	18 contacts →
	Exact match “Guiding businesses in their clean energy transition, by providing the best energy technology that prioritizes self-sufficiency, economic responsibility, and environmental…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	The Futurelist	Exact match	United KingdomHQ recorded Sep 19, 2026	11-50	18 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	Ampyr Distributed Energy	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	17 contacts →
	Exact match “At AMPYR Distributed Energy we design, build, own, and operate clean energy technologies that help our customers go green and reduce their energy costs.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Energy Revolution Ventures	Exact match	London, United KingdomHQ recorded Sep 19, 2026	1-10	15 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	Cambridge Cleantech	Exact match	Cambridge, United KingdomHQ recorded Sep 19, 2026	1-10	15 contacts →
	Exact match “As the UK’s leading cleantech innovation network, Cambridge Cleantech brings together innovators, investors, corporates, academics and the public sector to create a sustainable…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Becbc Limited	Exact match	Workington, United KingdomHQ recorded Sep 19, 2026	1-10	15 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	Central Research Laboratory	Exact match	Hayes, United KingdomHQ recorded Sep 19, 2026	11-50	15 contacts →
	Exact match “Central Research Laboratory (CRL) is the UK's leading accelerator and coworking space for hardware startups and product pioneers.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	Exergy3	Exact match	Edinburgh, United KingdomHQ recorded Sep 19, 2026	11-50	14 contacts →
	Exact match “Exergy3 is clean-tech spinout from the University of Edinburgh.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25	A Healthier Earth	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	14 contacts →
	Exact match “A Healthier Earth is a climate-tech catalyst delivering profitable, planet-positive projects at speed and scale.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “cleantech accelerators”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “cleantech accelerators” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 636 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “cleantech accelerators”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 247 company matches for cleantech accelerators associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Ashden tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most cleantech accelerators?

London leads with 129 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 636 professional contacts with verified work emails tracked across these 247 companies; direct dials are available where recorded.

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 SmartSearch, 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.