Company lists · Data refreshed October 2026

Top 25 Clean tech venture capital companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 58 companies tracked

RevenueBase identified 58 company matches for clean tech venture capital companies associated with London, United Kingdom as of October 2026 and tracks 549 professional contacts across them, including 308 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for clean tech venture capital companies associated with London, 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 October 1, 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 Oct 1, 2026 How this list was built

58Companies

549Contacts tracked

308Verified emails

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

Ranked by team size

Top 25 of 58 company matches for clean tech venture capital companies based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 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	Octopus Energy Generation	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	153 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Climate Investment CI	Exact match	London, United KingdomHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
3	AP Ventures	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	31 contacts →
	Exact match “AP Ventures is an independent venture capital firm headquartered in London, with offices in San Francisco and South Africa.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	ETF Partners	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	29 contacts →
	Exact match “Founded in 2005, ETF Partners (The Environmental Technologies Fund) stands as Europe's original venture capital firm dedicated to sustainability and impact investing.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	RAW Ventures	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	29 contacts →
	Exact match “With European roots and decades of experience, we invest globally in exceptional startups and talented teams.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Carbon Limiting Technologies	Exact match	London, United KingdomHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
7	Clean Growth Fund	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	13 contacts →
	Exact match “CGF invest in tech innovations that reduce greenhouse gas emissions or improve resource efficiency across power, transport, industry, buildings, waste and water.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Buckthorn Partners LLP	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	11 contacts →
	Exact match “Buckthorn invests in industrial businesses providing products and services that support the growth and integration of renewable energy, lower emissions, energy efficiency and…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Susten	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	11 contacts →
	Exact match “We invest in new energy technologies.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	First Imagine	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	9 contacts →
	Exact match “Early-stage venture capital investor focused on technologies driving the Energy transition.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Futuraiser	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	9 contacts →
	Exact match “Investments and consulting services” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Blume Equity	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	8 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	Conduit Ventures Limited	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	8 contacts →
	Exact match “Impact-driven venture and growth capital fund centred on Energy Decarbonization, Hydrogen, Water risks/Food Security and AI driven solutions.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Susgen	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	7 contacts →
	Exact match “Susgen is a London-based private investment firm focused on fighting climate change.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Ecopragma Capital LLP	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	7 contacts →
	Exact match “EcoPragma is dedicated to the net zero transition.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Ekta Partners	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	7 contacts →
	Exact match “Ekta raises capital for companies addressing environmental and social challenges through technology and innovation.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	Damazein Family Office	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	5 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	NOMEA	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	5 contacts →
	Exact match “Nomea is an innovative climate-tech fund that invests in technologies to reduce CO2 in the atmosphere.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Shorelight Partners	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	4 contacts →
	Exact match “Shorelight supports the Energy Transition towards lower emissions by investing in assets and technologies that operate in the lower carbon energy value chain, or help high…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	Celsius Industries	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	4 contacts →
	Exact match “We invest at the nexus of energy and fundamental industrial transformations – AI compute, energy transition, industrial resilience – across Technology Ventures and Real Assets…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	KOE Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	4 contacts →
	Exact match “New Energy & Sustainable Infrastructure Investment Platform” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Future 30 Funds	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	3 contacts →
	Exact match “Future 30 offers investors the opportunity to invest in sustainable, world changing companies.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	HEXLA	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	3 contacts →
	Exact match “Delivering the Hydrogen Economy” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	ONE Planet Capital	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	3 contacts →
	Exact match “OnePlanetCapital is more than an investment house, it’s part of a movement.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Renergia Holdings LTD	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1-10	3 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 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 “clean tech venture capital companies”. 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 58 clean tech venture capital companies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 308 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Oct 1, 2026

56.1%Verified-email coverage

9.5Average contacts per company

1-10Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 58 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 London, United Kingdom whose business descriptions match “clean tech venture capital companies” 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 308 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 October 1, 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 “clean tech venture capital companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many clean tech venture capital companies are there based in London, United Kingdom?

RevenueBase identified 58 company matches for clean tech venture capital companies associated with London, United Kingdom as of October 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?

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

Which city in the United Kingdom has the most clean tech venture capital companies?

London leads the United Kingdom with 58 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 308 professional contacts with verified work emails tracked across these 58 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 October 1, 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.