Company lists · Data refreshed September 2026

Top 25 Climate tech startups based in the United Kingdom

Name: Climate tech startups 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 347 companies tracked

RevenueBase identified 347 company matches for climate tech startups associated with the United Kingdom as of September 2026 and tracks 26,133 professional contacts across them, including 10,566 with verified work emails. London is the largest hub.

This list covers company matches for climate tech startups 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

347Companies

26,133Contacts tracked

10,566Verified emails

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The 25 largest climate tech startups based in the United Kingdom

Ranked by team size

Top 25 of 347 company matches for climate tech startups 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	Subsea7	Exact match	London, United KingdomHQ recorded Sep 19, 2026	10001+	12,645 contacts →
	Exact match “Subsea7 makes offshore energy transition possible through the continuous evolution of lower-carbon oil and gas and by enabling the growth of renewables and emerging energy.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Anthesis Group	Exact match	London, United KingdomHQ recorded Sep 19, 2026	1,001-5,000	894 contacts →
	Exact match “Anthesis guides clients to sustainable performance.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	KBC A Yokogawa Company	Exact match	Walton-on-thames, United KingdomHQ recorded Sep 19, 2026	201-500	658 contacts →
	Exact match “We are passionate about driving sustainable change for our planet.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Energy Saving Trust	Exact match	London, United KingdomHQ recorded Sep 19, 2026	201-500	426 contacts →
	Exact match “Energy Saving Trust is an independent organisation dedicated to promoting energy efficiency, low carbon transport and sustainable energy use.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	Avantis	Exact match	Cardiff, United KingdomHQ recorded Sep 19, 2026	501-1,000	213 contacts →
	Exact match “Avantis Group, based in the UK, is a global leader in energy and transportation.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	Carbon Clean	Exact match	London, United KingdomHQ recorded Sep 19, 2026	51-200	188 contacts →
	Exact match “Carbon Clean is the point-source carbon capture expert, driving the decarbonisation of hard-to-abate industries for more than 15 years.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	CFP Energy	Exact match	London, United KingdomHQ recorded Sep 19, 2026	201-500	171 contacts →
	Exact match “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	AMP Clean Energy	Exact match	Holborn, United KingdomHQ recorded Sep 19, 2026	51-200	134 contacts →
	Exact match “We are AMP We are an energy company that turns sustainability ambitions into reality.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	First Mode	Exact match	London, United KingdomHQ recorded Sep 19, 2026	201-500	93 contacts →
	Exact match “First Mode develops and manufactures decarbonization solutions for heavy industry partners dedicated to the clean energy future.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	Storegga	Exact match	London, United KingdomHQ recorded Sep 19, 2026	51-200	83 contacts →
	Exact match “Storegga, a business established in 2020 as an independent champion for the development of carbon reduction and carbon removal technologies.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	clearvue.business	Exact match	Gateshead, United KingdomHQ recorded Sep 19, 2026	51-200	81 contacts →
	Exact match “We enable businesses to succeed in the environmental components of their ESG strategies through comprehensive net zero consulting services and ground-breaking carbon and energy…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	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
13	Team Energy Auditing Agency LTD	Exact match	Milton Keynes, United KingdomHQ recorded Sep 19, 2026	51-200	69 contacts →
	Exact match “TEAM is the UK’s leading supplier of carbon and energy management solutions committed to driving the efficiency and sustainability of energy consumption and environmental…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	City Science	Exact match	Exeter, United KingdomHQ recorded Sep 19, 2026	51-200	68 contacts →
	Exact match “CARBON FIRST ENGINEERING City Science is the first engineering company dedicated to decarbonisation.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	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
16	Climate Connect Digital	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	63 contacts →
	Exact match “Climate Connect Digital (CCD) is a climate-tech company with Digital Monitoring Reporting Verification products in carbon markets.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	Climate Investment CI	Exact match	London, United KingdomHQ recorded Sep 19, 2026	51-200	62 contacts →
	Exact match “Climate Investment is a US and UK-based independently managed specialist investor focused on accelerating capital-efficient decarbonization of heavy emitting sectors.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	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
19	Progressive Energy	Exact match	Stonehouse, United KingdomHQ recorded Sep 19, 2026	11-50	42 contacts →
	Exact match “Taking carbon out of the world by developing low carbon energy projects.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Syzygy	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	35 contacts →
	Exact match “Founded in 2010, Syzygy is the leading specialist low carbon technology consultancy for the real estate sector.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	Angara Global LTD UK	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	33 contacts →
	Exact match “ANGARA turns $100 billion of invisible fouling losses into measurable profit through Proactive Fouling Management in industrial heat transfer with paired AI analytics and patented…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Elire Group	Exact match	London, United KingdomHQ recorded Sep 19, 2026	11-50	32 contacts →
	Exact match “ELIRE pioneers innovative solutions that enable our clients and partners to reach their decarbonisation and net zero goals.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	Zestec Renewable Energy	Exact match	Bournemouth, United KingdomHQ recorded Sep 19, 2026	11-50	28 contacts →
	Exact match “Owned by funds advised by Octopus Energy Generation, one of Europe’s largest renewable energy investors currently managing renewable assets totalling more than £5bn, we are…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	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
25	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

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 “climate tech startups”. 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 347 climate tech startups based in the United Kingdom

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Climate tech startups based in the United Kingdom at a glance

As of Sep 19, 2026

40.4%Verified-email coverage

75.3Average contacts per company

1-10Median size (employees)

49.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

228

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 347 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 “climate tech startups” 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 10,566 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 “climate tech startups”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many climate tech startups are there based in the United Kingdom?

RevenueBase identified 347 company matches for climate tech startups 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?

Subsea7 tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most climate tech startups?

London leads with 170 company records, followed by Manchester (12) and Edinburgh (10).

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 10,566 professional contacts with verified work emails tracked across these 347 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.