Company lists · Data refreshed September 2026

Top 25 Clean tech companies worldwide

Name: Clean tech companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 22,321 companies tracked

RevenueBase identified 22,321 clean tech companies worldwide as of September 2026 and tracks 595,185 professional contacts across them, including 171,518 with verified work emails. The United States is the largest market and London the largest hub.

This list covers clean tech companies worldwide, 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 19, 2026. Country and city lists for clean tech companies follow the table.

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 19, 2026 86% judged on-target in blind review

22,321Companies

595,185Contacts tracked

171,518Verified emails

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The 25 largest clean tech companies worldwide

Ranked by team size

Top 25 of 22,321 clean tech companies worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to clean tech 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	Johnson Controls	Indirect evidence	Cork, IrelandHQ checked Sep 19, 2026	10001+	52,736 contacts →
	Indirect evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 19, 2026
2	EDF	Indirect evidence	Paris, FranceHQ checked Sep 19, 2026	10001+	44,842 contacts →
	Indirect evidence “Our raison d'être is to build a net zero energy future with electricity and innovative solutions and services, to help save the planet and drive wellbeing and economic development.” Source: RevenueBase Database · checked Sep 19, 2026
3	GE Vernova	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	10001+	29,528 contacts →
	Indirect evidence “GE Vernova is a purpose-built energy technology company on a mission to electrify to thrive and decarbonize the world.” Source: RevenueBase Database · checked Sep 19, 2026
4	Acciona	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	10001+	27,028 contacts →
	Indirect evidence “ACCIONA champions a different way of doing business: Business as Unusual, delivering benefits far beyond the corporate realm.” Source: RevenueBase Database · checked Sep 19, 2026
5	Technipfmc	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 19, 2026	10001+	19,907 contacts →
	Indirect evidence “TechnipFMC is a leading technology provider to the traditional and new energies industry, delivering fully integrated projects, products, and services.” Source: RevenueBase Database · checked Sep 19, 2026
6	Subsea7	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	10001+	12,645 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 19, 2026
7	Engie Solutions France	Indirect evidence	La Garenne-colombes, FranceHQ checked Sep 19, 2026	10001+	12,011 contacts →
	Indirect evidence “Les activités Infrastructures Energétiques Locales d’ENGIE accompagnent les collectivités, les industries et le secteur du bâtiment sur la voie de la décarbonation.” Source: RevenueBase Database · checked Sep 19, 2026
8	TRANE	Indirect evidence	Davidson, NC, United StatesHQ checked Sep 19, 2026	10001+	10,272 contacts →
	Indirect evidence “Trane is the building technology and energy solutions leader who deploys a depth and breadth of expertise, backgrounds, and perspectives to innovate new technologies and…” Source: RevenueBase Database · checked Sep 19, 2026
9	Carrier Hvac	Indirect evidence	United StatesHQ checked Sep 19, 2026	10001+	10,099 contacts →
	Indirect evidence “Carrier is a global leader in intelligent climate and energy solutions, pioneering sustainable innovations in climate technologies.” Source: RevenueBase Database · checked Sep 19, 2026
10	Dalkia	Indirect evidence	Saint-andré-lez-lille, FranceHQ checked Sep 19, 2026	10001+	8,427 contacts →
	Indirect evidence “Dalkia : ensemble, relevons le défi climatique!” Source: RevenueBase Database · checked Sep 19, 2026
11	Johnson Matthey	Indirect evidence	London, ItalyHQ checked Sep 19, 2026	5,001-10,000	8,053 contacts →
	Indirect evidence “Johnson Matthey (JM) is a world leader in platinum group metals (PGMs).” Source: RevenueBase Database · checked Sep 19, 2026
12	EDP	Indirect evidence	Lisbon, PortugalHQ checked Sep 19, 2026	10001+	6,435 contacts →
	Indirect evidence “Our story began 50 years ago.” Source: RevenueBase Database · checked Sep 19, 2026
13	Alfanar	Indirect evidence	Riyadh, Saudi ArabiaHQ checked Sep 19, 2026	10001+	6,383 contacts →
	Indirect evidence “alfanar builds efficient energy systems & solutions of the present and sets up infrastructures for a brighter future.” Source: RevenueBase Database · checked Sep 19, 2026
14	The AES Corporation	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,387 contacts →
	Indirect evidence “The world no longer thinks of energy as a matter of supply and demand.” Source: RevenueBase Database · checked Sep 19, 2026
15	Enel Green Power	Indirect evidence	Roma, ItalyHQ checked Sep 19, 2026	5,001-10,000	5,251 contacts →
	Indirect evidence “We are the Enel Group company dedicated to the development and management of renewable energy generation worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
16	RENEW	Partial evidence	Gurugram, IndiaHQ checked Sep 19, 2026	1,001-5,000	4,340 contacts →
	Partial evidence “ReNew is a leading decarbonisation solutions provider and the first Indian clean energy company to list on Nasdaq (Nasdaq: RNW).” Source: RevenueBase Database · checked Sep 19, 2026
17	Octopus Energy	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	3,989 contacts →
	Indirect 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 19, 2026
18	Generac	Indirect evidence	Waukesha, WI, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,797 contacts →
	Indirect evidence “Generac is the total energy solutions company powering a smarter world.” Source: RevenueBase Database · checked Sep 19, 2026
19	Adani Green Energy LTD	Partial evidence	United StatesHQ checked Sep 19, 2026	1,001-5,000	3,017 contacts →
	Partial evidence “Adani Green Energy Limited (AGEL) is India’s largest renewable energy company playing a vital role in enabling the clean energy transition.” Source: RevenueBase Database · checked Sep 19, 2026
20	Veolia UK	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	10001+	2,823 contacts →
	Indirect evidence “Veolia UK provides solutions for ecological transformation which means reconciling human progress with environmental protection.” Source: RevenueBase Database · checked Sep 19, 2026
21	FTI	Indirect evidence	Menasha, WI, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,741 contacts →
	Indirect evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 19, 2026
22	Tata Power Renewable Energy Limited	Indirect evidence	Mumbai, IndiaHQ checked Sep 19, 2026	501-1,000	2,660 contacts →
	Indirect evidence “Tata Power Renewable Energy Limited (TPREL) is one of India’s leading renewable energy companies, driving the transition towards a cleaner, more resilient and sustainable energy…” Source: RevenueBase Database · checked Sep 19, 2026
23	ENAP	Indirect evidence	Las Condes, ChileHQ checked Sep 19, 2026	1,001-5,000	2,630 contacts →
	Indirect evidence “Diariamente nos mueve crear más y mejores fuentes de energía para el desarrollo de los países y las futuras generaciones.” Source: RevenueBase Database · checked Sep 19, 2026
24	Topsoe	Indirect evidence	Kongens Lyngby, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,616 contacts →
	Indirect evidence “Topsoe is a leading global provider of technology and solutions for the energy transition.” Source: RevenueBase Database · checked Sep 19, 2026
25	Greenko Group	Indirect evidence	Hyderabad, IndiaHQ checked Sep 19, 2026	1,001-5,000	2,578 contacts →
	Indirect evidence “Greenko, is one of the World’s leading Energy Transition and Decarbonization solutions company, with an installed Renewable Energy capacity of ~7.5 GW across Wind, Solar and Hydro…” Source: RevenueBase Database · checked Sep 19, 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 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 companies.
Partial evidence: Its own public description names part of clean tech 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 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 22,321 clean tech companies worldwide

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Clean tech companies worldwide at a glance

As of Sep 19, 2026

28.8%Verified-email coverage

26.7Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11,690

11-50

7,516

51-200

2,100

201-500

529

501-1,000

178

1,001-5,000

160

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 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.
Coverage: Every country. Country and city lists for clean tech companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “clean tech 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 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 companies, and records with no verified work email.
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, 171,518 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 19, 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 companies by location

100 lists · largest first

Every Clean tech companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 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 companies are there worldwide?

RevenueBase identified 22,321 clean tech companies worldwide 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?

Johnson Controls, headquartered in Milwaukee, tops this list with the largest team on record.

Which country has the most clean tech companies?

The United States leads with 3,164 companies, followed by India (1,601) and Brazil (1,523). Every clean tech companies list by country and city is linked on this page.

Which city has the most clean tech companies?

London leads with 310 headquartered companies, followed by Sao Paulo (188) and Madrid (166).

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 171,518 verified decision-maker contacts tracked across these 22,321 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 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 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.