Company lists · Data refreshed September 2026

Top 25 Sustainable energy contractors worldwide

Name: Sustainable energy contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 34,189 companies tracked

RevenueBase identified 34,189 sustainable energy contractors worldwide as of September 2026 and tracks 562,125 professional contacts across them, including 153,523 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers sustainable energy contractors 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 18, 2026. Country and city lists for sustainable energy contractors 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 18, 2026 86% judged on-target in blind review

34,189Companies

562,125Contacts tracked

153,523Verified emails

0Mobile numbers

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The 25 largest sustainable energy contractors worldwide

Ranked by team size

Top 25 of 34,189 sustainable energy contractors worldwide, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable energy contractors: 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	Partial evidence	Cork, IrelandHQ checked Sep 18, 2026	10001+	52,736 contacts →
	Partial evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 18, 2026
2	Siemens Gamesa	Partial evidence	Zamudio, SpainHQ checked Sep 18, 2026	10001+	18,693 contacts →
	Partial evidence “Siemens Gamesa is a global technology leader in the renewable energy industry - specifically in the development, manufacturing, installation and maintenance of wind turbines.” Source: RevenueBase Database · checked Sep 18, 2026
3	Dalkia	Indirect evidence	Saint-andré-lez-lille, FranceHQ checked Sep 18, 2026	10001+	8,427 contacts →
	Indirect evidence “Dalkia : ensemble, relevons le défi climatique!” Source: RevenueBase Database · checked Sep 18, 2026
4	Sunrun	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 18, 2026	10001+	7,974 contacts →
	Partial evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 18, 2026
5	Ørsted	Partial evidence	Fredericia, United StatesHQ checked Sep 18, 2026	5,001-10,000	7,538 contacts →
	Partial evidence “Ørsted is the global leader in offshore wind power and is one of the largest renewable energy companies in the world.” Source: RevenueBase Database · checked Sep 18, 2026
6	Suzlon Group	Partial evidence	Pune, IndiaHQ checked Sep 18, 2026	5,001-10,000	7,141 contacts →
	Partial evidence “Suzlon is a global wind-first, full-stack clean energy solutions conglomerate with businesses spanning RE Technology (Wind, Solar, Storage), RE Development Company, RE Asset…” Source: RevenueBase Database · checked Sep 18, 2026
7	Alfanar	Partial evidence	Riyadh, Saudi ArabiaHQ checked Sep 18, 2026	10001+	6,383 contacts →
	Partial evidence “alfanar builds efficient energy systems & solutions of the present and sets up infrastructures for a brighter future.” Source: RevenueBase Database · checked Sep 18, 2026
8	Enel Green Power	Partial evidence	Roma, ItalyHQ checked Sep 18, 2026	5,001-10,000	5,251 contacts →
	Partial evidence “We are the Enel Group company dedicated to the development and management of renewable energy generation worldwide.” Source: RevenueBase Database · checked Sep 18, 2026
9	RENEW	Partial evidence	Gurugram, IndiaHQ checked Sep 18, 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 18, 2026
10	RES	Partial evidence	Kings Langley, United KingdomHQ checked Sep 18, 2026	1,001-5,000	3,721 contacts →
	Partial evidence “RES is the world’s largest independent renewable energy company, working across 24 countries and active in wind, solar, energy storage, green hydrogen, transmission, and…” Source: RevenueBase Database · checked Sep 18, 2026
11	Luminous Power Technologies P LTD	Indirect evidence	Gurgaon, IndiaHQ checked Sep 18, 2026	5,001-10,000	3,713 contacts →
	Indirect evidence “Powering Progress, Lighting Lives!” Source: RevenueBase Database · checked Sep 18, 2026
12	IDEX	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 18, 2026	5,001-10,000	3,353 contacts →
	Indirect evidence “Fondé en France en 1963, le groupe IDEX, fort de près de 6 500 collaborateurs, développe, conçoit, finance, construit et exploite des infrastructures énergétiques locales et…” Source: RevenueBase Database · checked Sep 18, 2026
13	ENPAL	Partial evidence	Berlin, GermanyHQ checked Sep 18, 2026	5,001-10,000	3,242 contacts →
	Partial evidence “Enpal is Europe's leading new energy company.” Source: RevenueBase Database · checked Sep 18, 2026
14	Enphase Energy	Partial evidence	Fremont, CA, United StatesHQ checked Sep 18, 2026	1,001-5,000	3,130 contacts →
	Partial evidence “Enphase Energy is a global energy technology company and the world’s leading supplier of microinverter-based solar and battery systems.” Source: RevenueBase Database · checked Sep 18, 2026
15	FTI	Partial evidence	Menasha, WI, United StatesHQ checked Sep 18, 2026	1,001-5,000	2,741 contacts →
	Partial evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 18, 2026
16	Sunpower Corporation	Partial evidence	Richmond, CA, United StatesHQ checked Sep 18, 2026	1,001-5,000	2,675 contacts →
	Partial evidence “We believe clean energy and backup storage should be accessible to everybody.” Source: RevenueBase Database · checked Sep 18, 2026
17	Tata Power Renewable Energy Limited	Strong evidence	Mumbai, IndiaHQ checked Sep 18, 2026	501-1,000	2,660 contacts →
	Strong 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 18, 2026
18	Greenko Group	Partial evidence	Hyderabad, IndiaHQ checked Sep 18, 2026	1,001-5,000	2,578 contacts →
	Partial 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 18, 2026
19	SICIM	Strong evidence	Busseto, ItalyHQ checked Sep 18, 2026	10001+	2,404 contacts →
	Strong evidence “SICIM is a leading Worldwide EPC Contractor since 1962, offering all kinds of services related to the production, treatment and transportation of traditional energy sources and…” Source: RevenueBase Database · checked Sep 18, 2026
20	Goldwind	Partial evidence	Daxing District, ChinaHQ checked Sep 18, 2026	10001+	2,392 contacts →
	Partial evidence “As a reliable global strategic partner in clean energy, Goldwind is committed Driving a Renewable Future and centering its business on Ecology-Oriented Development+ENERGY industry…” Source: RevenueBase Database · checked Sep 18, 2026
21	Waaree Group	Partial evidence	Mumbai, IndiaHQ checked Sep 18, 2026	5,001-10,000	2,264 contacts →
	Partial evidence “Founded in 1990, Waaree Energies Limited is India’s leading renewable energy company, driving the global transition to clean power.” Source: RevenueBase Database · checked Sep 18, 2026
22	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 18, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 18, 2026
23	Trinasolar	Indirect evidence	Jiangsu, ChinaHQ checked Sep 18, 2026	10001+	2,199 contacts →
	Indirect evidence “Founded in 1997, Trinasolar (688599.” Source: RevenueBase Database · checked Sep 18, 2026
24	Innio Group	Partial evidence	Munich, GermanyHQ checked Sep 18, 2026	1,001-5,000	2,111 contacts →
	Partial evidence “INNIO Group is a global distributed energy solutions provider that delivers reliable, flexible, transient, decentralized, modular and efficient power.” Source: RevenueBase Database · checked Sep 18, 2026
25	Envision Energy	Partial evidence	Huangpu District, ChinaHQ checked Sep 18, 2026	1,001-5,000	1,961 contacts →
	Partial evidence “Envision Energy is a world-leading green technology company that provides renewable energy solutions for global enterprises, governments, and institutions.” Source: RevenueBase Database · checked Sep 18, 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: sustainable energy contractors. 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 sustainable energy contractors.
Partial evidence: Its own public description names part of sustainable energy contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable energy contractors. 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 34,189 sustainable energy contractors worldwide

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Sustainable energy contractors worldwide at a glance

As of Sep 18, 2026

27.3%Verified-email coverage

16.4Average contacts per company

11-50Median size (employees)

0.9%Largest-city concentration · London

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

16,248

11-50

12,833

51-200

3,583

201-500

813

501-1,000

230

1,001-5,000

173

5,001-10,000

10001+

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 sustainable energy contractors, 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: 59 countries, largest first: the United States, India, Brazil, the United Kingdom, Germany, France, Spain, Italy, Australia, the Netherlands and 49 more. Country and city lists for sustainable energy contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sustainable energy contractors”. 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 sustainable energy contractors), 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 sustainable energy contractors, 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, 153,523 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 18, 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.

Sustainable energy contractors by location

143 lists · largest first

Every Sustainable energy contractors 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 sustainable energy contractors, 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 sustainable energy contractors are there worldwide?

RevenueBase identified 34,189 sustainable energy contractors 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 sustainable energy contractors?

The United States leads with 5,050 companies, followed by India (2,984) and Brazil (2,880). Every sustainable energy contractors list by country and city is linked on this page.

Which city has the most sustainable energy contractors?

London leads with 300 headquartered companies, followed by Lahore (243) and Madrid (231).

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 153,523 verified decision-maker contacts tracked across these 34,189 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 18, 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.