Company lists · Data refreshed October 2026

Top 25 Clean tech venture capital companies based in the United Kingdom

Name: Clean tech venture capital companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 93 companies tracked

RevenueBase identified 93 clean tech venture capital companies headquartered in the United Kingdom as of October 2026 and tracks 800 professional contacts across them, including 411 with verified work emails. London is the largest hub.

This list covers clean tech venture capital companies 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 October 1, 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 Oct 1, 2026 86% judged on-target in blind review

93Companies

800Contacts tracked

411Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest clean tech venture capital companies based in the United Kingdom

Ranked by team size

Top 25 of 93 clean tech venture capital companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Oct 1, 2026. RevenueBase Smart Search rates how each company's information relates to clean tech venture capital companies: 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	Octopus Energy Generation	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	201-500	153 contacts →
	Indirect evidence “At Octopus Energy Generation, we’re building green power for the future, from large-scale solar to onshore and offshore wind, and innovative initiatives like the Fan Club.” Source: RevenueBase Database · checked Oct 1, 2026
2	Climate Investment CI	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	51-200	62 contacts →
	Partial evidence “Climate Investment is a US and UK-based independently managed specialist investor focused on accelerating capital-efficient decarbonization of heavy emitting sectors.” Source: RevenueBase Database · checked Oct 1, 2026
3	Aura Power	Indirect evidence	Bristol, United KingdomHQ checked Oct 1, 2026	11-50	58 contacts →
	Indirect evidence “Aura Power is a renewable energy investor, developer and adviser.” Source: RevenueBase Database · checked Oct 1, 2026
4	AP Ventures	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	31 contacts →
	Strong evidence “AP Ventures is an independent venture capital firm headquartered in London, with offices in San Francisco and South Africa.” Source: RevenueBase Database · checked Oct 1, 2026
5	ETF Partners	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	29 contacts →
	Strong evidence “Founded in 2005, ETF Partners (The Environmental Technologies Fund) stands as Europe's original venture capital firm dedicated to sustainability and impact investing.” Source: RevenueBase Database · checked Oct 1, 2026
6	RAW Ventures	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	29 contacts →
	Indirect evidence “With European roots and decades of experience, we invest globally in exceptional startups and talented teams.” Source: RevenueBase Database · checked Oct 1, 2026
7	Zestec Renewable Energy	Indirect evidence	Bournemouth, United KingdomHQ checked Oct 1, 2026	11-50	28 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Oct 1, 2026
8	Larkfleet Group Part Of Phoenix Sustainable Investments	Indirect evidence	Bourne, United KingdomHQ checked Oct 1, 2026	11-50	26 contacts →
	Indirect evidence “Larkfleet Group is now a part of Phoenix Sustainable Investments - an award-winning developer of sustainable energy projects.” Source: RevenueBase Database · checked Oct 1, 2026
9	Carbon Limiting Technologies	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	24 contacts →
	Partial evidence “At CLT, we believe clean technology is essential to building a resilient, competitive, and sustainable economy.” Source: RevenueBase Database · checked Oct 1, 2026
10	Boom Power	Indirect evidence	Arundel, United KingdomHQ checked Oct 1, 2026	11-50	18 contacts →
	Indirect evidence “BOOM Power is committed to developing renewable energy projects that contribute to a sustainable and low-carbon future.” Source: RevenueBase Database · checked Oct 1, 2026
11	HYCAP	Indirect evidence	Oxford, United KingdomHQ checked Oct 1, 2026	11-50	13 contacts →
	Indirect evidence “HYCAP is a global investment firm leading the energy transition through strategic investments across Private Equity, Technology, and Infrastructure.” Source: RevenueBase Database · checked Oct 1, 2026
12	Clean Growth Fund	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	13 contacts →
	Partial evidence “CGF invest in tech innovations that reduce greenhouse gas emissions or improve resource efficiency across power, transport, industry, buildings, waste and water.” Source: RevenueBase Database · checked Oct 1, 2026
13	SCVC	Partial evidence	Bristol, United KingdomHQ checked Oct 1, 2026	1-10	12 contacts →
	Partial evidence “We invest in advanced technologies from biotech to quantum tech, partnering with companies aligned with our mission of improving the health of people and the planet.” Source: RevenueBase Database · checked Oct 1, 2026
14	Buckthorn Partners LLP	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	11 contacts →
	Indirect evidence “Buckthorn invests in industrial businesses providing products and services that support the growth and integration of renewable energy, lower emissions, energy efficiency and…” Source: RevenueBase Database · checked Oct 1, 2026
15	Susten	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	11 contacts →
	Indirect evidence “We invest in new energy technologies.” Source: RevenueBase Database · checked Oct 1, 2026
16	First Imagine	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	9 contacts →
	Strong evidence “Early-stage venture capital investor focused on technologies driving the Energy transition.” Source: RevenueBase Database · checked Oct 1, 2026
17	Futuraiser	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	11-50	9 contacts →
	Indirect evidence “Investments and consulting services” Source: RevenueBase Database · checked Oct 1, 2026
18	Blume Equity	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	8 contacts →
	Partial evidence “Blume Equity is a climate-tech growth equity firm with offices in London and Amsterdam focusing on companies driving sustainable outcomes for planet and people.” Source: RevenueBase Database · checked Oct 1, 2026
19	TSP Ventures	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	8 contacts →
	Strong evidence “TSP Ventures is an early-stage venture capital firm backing transformative hard science solutions to the most pressing environmental and climate challenges.” Source: RevenueBase Database · checked Oct 1, 2026
20	Conduit Ventures Limited	Strong evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	8 contacts →
	Strong evidence “Impact-driven venture and growth capital fund centred on Energy Decarbonization, Hydrogen, Water risks/Food Security and AI driven solutions.” Source: RevenueBase Database · checked Oct 1, 2026
21	Susgen	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	7 contacts →
	Indirect evidence “Susgen is a London-based private investment firm focused on fighting climate change.” Source: RevenueBase Database · checked Oct 1, 2026
22	Ecopragma Capital LLP	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	7 contacts →
	Indirect evidence “EcoPragma is dedicated to the net zero transition.” Source: RevenueBase Database · checked Oct 1, 2026
23	Ekta Partners	Partial evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	7 contacts →
	Partial evidence “Ekta raises capital for companies addressing environmental and social challenges through technology and innovation.” Source: RevenueBase Database · checked Oct 1, 2026
24	Damazein Family Office	Indirect evidence	London, United KingdomHQ checked Oct 1, 2026	1-10	5 contacts →
	Indirect evidence “We support the innovators and creators of new technologies meeting the vital need to enhance communication and knowledge for people and organizations, preserve the environment…” Source: RevenueBase Database · checked Oct 1, 2026
25	Oasthouse Ventures Limited	Partial evidence	Brighton, United KingdomHQ checked Oct 1, 2026	1-10	5 contacts →
	Partial evidence “Oasthouse Ventures develop businesses which have a positive impact on the world.” Source: RevenueBase Database · checked Oct 1, 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: clean tech venture capital companies. 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 clean tech venture capital companies.
Partial evidence: Its own public description names part of clean tech venture capital companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean tech venture capital companies. 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 93 clean tech venture capital companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 411 reachable decision-makers.

Free signup · no credit card

View the full list →

Clean tech venture capital companies based in the United Kingdom at a glance

As of Oct 1, 2026

51.4%Verified-email coverage

8.6Average contacts per company

1-10Median size (employees)

62.4%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 93 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 clean tech venture capital companies, 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 “clean tech venture capital companies”. 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 clean tech venture capital companies), 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 clean tech venture capital companies, 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, 411 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 October 1, 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.

Clean tech venture capital companies by metro

Clean tech venture capital companies in London58

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 clean tech venture capital companies, 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 clean tech venture capital companies are there based in the United Kingdom?

RevenueBase identified 93 clean tech venture capital companies headquartered in the United Kingdom as of October 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?

Octopus Energy Generation, headquartered in London, tops this list with the largest team on record.

Which city has the most clean tech venture capital companies?

London leads with 58 headquartered companies, followed by Manchester (4) and Bristol (3).

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 411 verified decision-maker contacts tracked across these 93 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 2026.

Ready to reach these companies? Verified emails and direct dials for all 93 clean tech venture capital companies based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Clean tech venture capital companies by geography

Browse the directory

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.