Company lists · Data refreshed September 2026

Top 25 Clean energy technology firms based in London, United Kingdom

Name: Clean energy technology firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 311 companies tracked

RevenueBase identified 311 clean energy technology firms headquartered in London, United Kingdom as of September 2026 and tracks 13,031 professional contacts across them, including 5,008 with verified work emails. London is the largest hub.

This list covers clean energy technology firms headquartered in London, 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 16, 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 16, 2026 86% judged on-target in blind review

311Companies

13,031Contacts tracked

5,008Verified emails

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The 25 largest clean energy technology firms based in London, United Kingdom

Ranked by team size

Top 25 of 311 clean energy technology firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to clean energy technology firms: 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	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	3,989 contacts →
	Partial evidence “We're on a mission to make a big green dent in the universe by building a truly sustainable energy system globally.” Source: RevenueBase Database · checked Sep 16, 2026
2	Lightsource BP	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	1,114 contacts →
	Partial evidence “Lightsource bp is working to support a future powered by renewable, affordable and reliable energy that benefits our partners, people and planet.” Source: RevenueBase Database · checked Sep 16, 2026
3	Sonnedix	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	563 contacts →
	Strong evidence “Sonnedix is a global renewable energy company delivering 100% clean electricity directly to customers through a diversified portfolio of solar, wind, and storage assets.” Source: RevenueBase Database · checked Sep 16, 2026
4	Cubico Sustainable Investments	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	406 contacts →
	Partial evidence “Cubico Sustainable Investments is one of the world’s largest privately-owned renewable energy companies, leveraging our strong local presence with a unique combination of in-house…” Source: RevenueBase Database · checked Sep 16, 2026
5	Reon Energy Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	402 contacts →
	Partial evidence “Reon Energy is a leading Cleantech company deploying Intelligent Renewable Energy Microgrids across South Asia, GCC & African region.” Source: RevenueBase Database · checked Sep 16, 2026
6	SO Energy	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	378 contacts →
	Partial evidence “We do energy, you do you.” Source: RevenueBase Database · checked Sep 16, 2026
7	Zenobē	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	336 contacts →
	Strong evidence “We're Zenobē Energy and we're on a mission to make clean power accessible.” Source: RevenueBase Database · checked Sep 16, 2026
8	Intec Energy Solutions	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	242 contacts →
	Partial evidence “INTEC Energy Solutions delivers best-in-class services in Engineering, Procurement, Construction (EPC), Battery Energy Storage Systems (BESS), Manufacturing, Project Development…” Source: RevenueBase Database · checked Sep 16, 2026
9	LOW Carbon	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	195 contacts →
	Partial evidence “Low Carbon creates renewable energy to fight climate change.” Source: RevenueBase Database · checked Sep 16, 2026
10	OWC	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	185 contacts →
	Partial evidence “The Renewable Energy Consultants.” Source: RevenueBase Database · checked Sep 16, 2026
11	FIELD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	179 contacts →
	Partial evidence “We're creating the renewable energy infrastructure and trading company of the future.” Source: RevenueBase Database · checked Sep 16, 2026
12	Octopus Energy Generation	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	153 contacts →
	Partial 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 Sep 16, 2026
13	Cero Generation	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	145 contacts →
	Partial evidence “We’re focused on developing and delivering utility-scale solar and battery energy storage system (BESS) projects that power the transition to a cleaner, more resilient energy…” Source: RevenueBase Database · checked Sep 16, 2026
14	Statera Energy	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	142 contacts →
	Partial evidence “Statera Energy is a UK-based energy company that develops, owns, and operates flexible generation, battery storage, pumped hydro and green hydrogen projects.” Source: RevenueBase Database · checked Sep 16, 2026
15	EDF Renewables UK & Ireland	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	117 contacts →
	Partial evidence “EDF Renewables is part of one of the world’s leading renewable energy companies in the UK.” Source: RevenueBase Database · checked Sep 16, 2026
16	Econergy Renewable Energy LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	112 contacts →
	Partial evidence “Our Vision Renewable energy will be the source of power for future generations.” Source: RevenueBase Database · checked Sep 16, 2026
17	Ampyr Solar Europe	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	82 contacts →
	Indirect evidence “Headquartered in London, AMPYR Solar Europe (ASE) is an independent renewable asset developer and IPP active in Germany, the Netherlands and the UK.” Source: RevenueBase Database · checked Sep 16, 2026
18	Innova	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	77 contacts →
	Partial evidence “Innova is a forward-thinking renewable energy business, employing people across two offices in London and Cheltenham.” Source: RevenueBase Database · checked Sep 16, 2026
19	Wattstor	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	70 contacts →
	Indirect evidence “Think Outside The Grid.” Source: RevenueBase Database · checked Sep 16, 2026
20	Xlinks	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	69 contacts →
	Strong evidence “Xlinks is building a global portfolio of large-to-mega scale energy projects that generate and transport clean, affordable electrons.” Source: RevenueBase Database · checked Sep 16, 2026
21	Pacific Green	Partial evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
22	Nextenergy Group	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	59 contacts →
	Indirect evidence “NextEnergy Group was founded in 2007 to become a leading market participant in the international solar sector.” Source: RevenueBase Database · checked Sep 16, 2026
23	Renewable Power Capital	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	51 contacts →
	Partial evidence “We invest in the development, construction, and long-term ownership of solar, onshore wind and battery storage projects, enabling the energy transition and driving stable…” Source: RevenueBase Database · checked Sep 16, 2026
24	Elements Green	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	51 contacts →
	Partial evidence “Elements Green (EG) is a leading renewable energy developer headquartered in London, specialising in utility-scale solar PV systems and battery energy storage solutions.” Source: RevenueBase Database · checked Sep 16, 2026
25	Island Green Power	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	48 contacts →
	Indirect evidence “Island Green Power specialises in the development of utility-scale solar projects and battery storage systems with operations across the UK, Spain, Italy, Australia and New…” Source: RevenueBase Database · checked Sep 16, 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 energy technology firms. 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 energy technology firms.
Partial evidence: Its own public description names part of clean energy technology firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean energy technology firms. 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 311 clean energy technology firms based in London, United Kingdom

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Clean energy technology firms based in London, United Kingdom at a glance

As of Sep 16, 2026

38.4%Verified-email coverage

41.9Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

141

11-50

111

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 311 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 energy technology firms, 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 London, United Kingdom whose own description of what they do matches “clean energy technology firms”. 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 energy technology firms), 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 energy technology firms, and records with no verified work email. Companies headquartered outside London 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, 5,008 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 16, 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 energy technology firms by metro in the United Kingdom

Clean energy technology firms in London311
Clean energy technology firms in Manchester33
Clean energy technology firms in Glasgow31
Clean energy technology firms in Nottingham25

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 energy technology firms, 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 energy technology firms are there based in London, United Kingdom?

RevenueBase identified 311 clean energy technology firms headquartered in London, 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?

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

Which city has the most clean energy technology firms?

London leads with 311 headquartered companies, followed by Manchester (33) and Glasgow (31).

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 5,008 verified decision-maker contacts tracked across these 311 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 16, 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.