Company lists · Data refreshed October 2026

Top 25 Clean energy engineering firms worldwide

Name: Clean energy engineering firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 9, 2026 37,425 companies tracked

RevenueBase identified 37,425 company matches for clean energy engineering firms worldwide as of October 2026 and tracks 736,570 professional contacts across them, including 200,251 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for clean energy engineering firms worldwide, 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 9, 2026. Country and city lists for clean energy engineering firms follow the table.

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 9, 2026 How this list was built

37,425Companies

736,570Contacts tracked

200,251Verified emails

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The 25 largest clean energy engineering firms worldwide

Ranked by team size

Top 25 of 37,425 company matches for clean energy engineering firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 9, 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	Worley	Exact match	Sydney, AustraliaHQ recorded Oct 9, 2026	10001+	35,018 contacts →
	Exact match “Worley is a global professional services company of energy, chemicals and resources experts headquartered in Australia.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
2	Stantec	Exact match	Edmonton, AB, CanadaHQ recorded Oct 9, 2026	10001+	29,839 contacts →
	Exact match “Stantec empowers clients, people, and communities to rise to the world’s greatest challenges at a time when the world faces more unprecedented concerns than ever before.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
3	Acciona	Exact match	Madrid, SpainHQ recorded Oct 9, 2026	10001+	28,930 contacts →
	Exact match “ACCIONA champions a different way of doing business: Business as Unusual, delivering benefits far beyond the corporate realm.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4	Vestas	Exact match	Aarhus, DenmarkHQ recorded Oct 9, 2026	10001+	27,666 contacts →
	Exact match “Vestas is the energy industry’s global partner on sustainable energy solutions.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5	Atkinsréalis	Exact match	Montreal, QC, CanadaHQ recorded Oct 9, 2026	10001+	24,297 contacts →
	Exact match “We are a world-class engineering services and nuclear organization.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
6	Siemens Gamesa	Exact match	Zamudio, SpainHQ recorded Oct 9, 2026	10001+	18,116 contacts →
	Exact match “Siemens Gamesa is a global technology leader in the renewable energy industry - specifically in the development, manufacturing, installation and maintenance of wind turbines.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	Atkins	Exact match	Epsom, United KingdomHQ recorded Oct 9, 2026	10001+	9,147 contacts →
	Exact match “Atkins is now AtkinsRéalis.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
8	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Oct 9, 2026	10001+	8,823 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
9	KENT	Exact match	Dubai, United Arab EmiratesHQ recorded Oct 9, 2026	10001+	7,369 contacts →
	Exact match “We design, build and maintain the assets that power the world for today and make it future-ready for tomorrow.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
10	Ørsted	Exact match	Fredericia, United StatesHQ recorded Oct 9, 2026	5,001-10,000	7,263 contacts →
	Exact match “Ørsted is the global leader in offshore wind power and is one of the largest renewable energy companies in the world.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11	Suzlon Group	Exact match	Pune, IndiaHQ recorded Oct 9, 2026	5,001-10,000	7,174 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
12	Alfanar	Exact match	Riyadh, Saudi ArabiaHQ recorded Oct 9, 2026	10001+	6,606 contacts →
	Exact match “alfanar builds efficient energy systems & solutions of the present and sets up infrastructures for a brighter future.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13	Enel Green Power	Exact match	Rome, ItalyHQ recorded Oct 9, 2026	5,001-10,000	4,769 contacts →
	Exact match “We are the Enel Group company dedicated to the development and management of renewable energy generation worldwide.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
14	RENEW	Exact match	Gurgaon, IndiaHQ recorded Oct 9, 2026	1,001-5,000	4,430 contacts →
	Exact match “ReNew is a leading decarbonisation solutions provider and the first Indian clean energy company to list on Nasdaq (Nasdaq: RNW).” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
15	Sargent & Lundy	Exact match	Chicago, United StatesHQ recorded Oct 9, 2026	1,001-5,000	4,341 contacts →
	Exact match “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	RES	Exact match	Kings Langley, United KingdomHQ recorded Oct 9, 2026	1,001-5,000	3,875 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17	FTI	Exact match	Menasha, WI, United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,979 contacts →
	Exact match “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	Tata Power Renewable Energy Limited	Exact match	Mumbai, IndiaHQ recorded Oct 9, 2026	501-1,000	2,696 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	Adani Green Energy LTD	Exact match	United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,637 contacts →
	Exact match “Adani Green Energy Limited (AGEL) is India’s largest renewable energy company playing a vital role in enabling the clean energy transition.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20	Greenko Group	Exact match	Hyderabad, IndiaHQ recorded Oct 9, 2026	1,001-5,000	2,621 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21	Goldwind	Exact match	Daxing District, ChinaHQ recorded Oct 9, 2026	10001+	2,512 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,293 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	Axpo Group	Exact match	Baden, ItalyHQ recorded Oct 9, 2026	5,001-10,000	2,261 contacts →
	Exact match “Axpo is driven by a single purpose – to enable a sustainable future through innovative energy solutions.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
24	Waaree Group	Exact match	Mumbai, IndiaHQ recorded Oct 9, 2026	5,001-10,000	2,214 contacts →
	Exact match “Founded in 1990, Waaree Energies Limited is India’s leading renewable energy company, driving the global transition to clean power.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
25	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,206 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Oct 9, 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 energy engineering firms”. 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 37,425 clean energy engineering firms worldwide

See the full list, filter by size, metro and specialty, and access 200,251 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Clean energy engineering firms worldwide at a glance

As of Oct 9, 2026

27.2%Verified-email coverage

19.7Average contacts per company

1-10Median size (employees)

0.8%Largest-city concentration · London

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

18,649

11-50

13,401

51-200

3,707

201-500

946

501-1,000

267

1,001-5,000

224

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for clean energy engineering firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “clean energy engineering firms” 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. 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 200,251 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 9, 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.

Clean energy engineering firms by location

164 lists · largest first

Every Clean energy engineering firms 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 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 energy engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many clean energy engineering firms are there worldwide?

RevenueBase identified 37,425 company matches for clean energy engineering firms worldwide 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?

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

Which country has the most clean energy engineering firms?

The United States leads with 3,999 companies, followed by Brazil (2,702) and India (2,675). Every clean energy engineering firms list by country and city is linked on this page.

Which city has the most clean energy engineering firms?

London leads with 288 company records, followed by Madrid (251) and Sao Paulo (208).

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 200,251 professional contacts with verified work emails tracked across these 37,425 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 9, 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.