Company lists · Data refreshed August 2026

Top 25 Clean energy consultancy companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 31,075 companies tracked

RevenueBase identified 31,075 clean energy consultancy companies worldwide as of August 2026 and tracks 468,786 professional contacts across them, including 156,159 with verified work emails and 55,165 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers clean energy consultancy 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 August 31, 2026. Country and city lists for clean energy consultancy 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

31,075Companies

468,786Contacts tracked

156,159Verified emails

55,165Mobile numbers

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The 25 largest clean energy consultancy companies worldwide

Ranked by team size

Top 25 of 31,075 clean energy consultancy companies worldwide, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to clean energy consultancy 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	Worley	Partial evidence	Sydney, AU	10001+	36,380 contacts →
	Partial evidence “Worley is a global professional services company of energy, chemicals and resources experts headquartered in Australia.” Source: RevenueBase Database · checked Aug 31, 2026
2	Stantec	Indirect evidence	Edmonton, AB, CA	10001+	28,492 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Aug 31, 2026
3	WOOD	Partial evidence	Aberdeen, GB	10001+	27,349 contacts →
	Partial evidence “Wood is a global leader in consulting and engineering, delivering critical solutions across energy and materials markets.” Source: RevenueBase Database · checked Aug 31, 2026
4	Dalkia	Indirect evidence	Saint-Andre-Lez-Lille, FR	10001+	8,459 contacts →
	Indirect evidence “Dalkia : ensemble, relevons le défi climatique!” Source: RevenueBase Database · checked Aug 31, 2026
5	EDP	Indirect evidence	PT	10001+	6,430 contacts →
	Indirect evidence “Our story began more than 40 years ago.” Source: RevenueBase Database · checked Aug 31, 2026
6	RENEW	Strong evidence	Gurugram, IndiaHQ checked Aug 31, 2026	1,001-5,000	4,340 contacts →
	Strong 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 Aug 31, 2026
7	Sargent & Lundy	Indirect evidence	Midland, TX, US	1,001-5,000	4,145 contacts →
	Indirect evidence “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: RevenueBase Database · checked Aug 31, 2026
8	FTI	Partial evidence	Menasha, WI, US	1,001-5,000	2,712 contacts →
	Partial evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Aug 31, 2026
9	WSP I Sverige	Indirect evidence	Stockholm-Marievik, SE	10001+	2,632 contacts →
	Indirect evidence “What if you could shape built and natural environments – and the future of those that use them?” Source: RevenueBase Database · checked Aug 31, 2026
10	Clearesult	Partial evidence	Toronto, ON, CA	1,001-5,000	2,137 contacts →
	Partial evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Aug 31, 2026
11	Langan Engineering & Environmental Services	Indirect evidence	El Segundo, CA, US	1,001-5,000	2,136 contacts →
	Indirect evidence “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Source: RevenueBase Database · checked Aug 31, 2026
12	Baycurrent	Indirect evidence	港区, JapanHQ checked Aug 31, 2026	5,001-10,000	1,900 contacts →
	Indirect evidence Source: RevenueBase Database · checked Aug 31, 2026
13	Westwood Professional Services	Indirect evidence	Lake Charles, LA, US	1,001-5,000	1,631 contacts →
	Indirect evidence “At Westwood, our purpose is to create a better world for people through our work.” Source: RevenueBase Database · checked Aug 31, 2026
14	Swca Environmental Consultants	Indirect evidence	Phoenix, AZ, US	1,001-5,000	1,618 contacts →
	Indirect evidence “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: RevenueBase Database · checked Aug 31, 2026
15	Ameresco	Partial evidence	Framingham, MA, US	1,001-5,000	1,475 contacts →
	Partial evidence “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Source: RevenueBase Database · checked Aug 31, 2026
16	Davey Resource Group, INC	Indirect evidence	Kent, OH, US	1,001-5,000	1,407 contacts →
	Indirect evidence “We are officially known as Davey Resource Group Inc, but we are more likely to come up in conversation around a successful project we've completed for a client or a capability we…” Source: RevenueBase Database · checked Aug 31, 2026
17	IPE Global Limited	Indirect evidence	New Delhi, IndiaHQ checked Aug 31, 2026	501-1,000	1,322 contacts →
	Indirect evidence “Headquartered in India with six international offices in Cambodia, Ethiopia, Kenya, the Philippines, Germany and the United Kingdom, IPE Global Group offers a range of integrated…” Source: RevenueBase Database · checked Aug 31, 2026
18	Fichtner	Strong evidence	Stuttgart, DE	1,001-5,000	1,281 contacts →
	Strong evidence “As a leading, independent engineering and consultancy enterprise active in the sectors of energy and infrastructure, Fichtner handles challenging projects in countries all over…” Source: RevenueBase Database · checked Aug 31, 2026
19	Grupo Cosampa	Partial evidence	Fortaleza, BR	1,001-5,000	1,239 contacts →
	Partial evidence “O Grupo Cosampa vem conquistando espaço no mercado, através da prestação de serviços com qualidade e excelência, nas áreas de construção civil, engenharia elétrica e energias…” Source: RevenueBase Database · checked Aug 31, 2026
20	Barr Engineering CO	Indirect evidence	Washington, US	1,001-5,000	1,098 contacts →
	Indirect evidence “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: RevenueBase Database · checked Aug 31, 2026
21	Associated Engineering	Indirect evidence	Fort Mcmurray, AB, CA	501-1,000	1,029 contacts →
	Indirect evidence “At Associated, we are passionate about building communities that are vibrant, healthy and resilient and support economic growth.” Source: RevenueBase Database · checked Aug 31, 2026
22	Penspen	Partial evidence	Villahermosa, MX	1,001-5,000	1,006 contacts →
	Partial evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Aug 31, 2026
23	Wärtsilä Energy	Partial evidence	Helsinki, FI	10001+	948 contacts →
	Partial evidence “Wärtsilä leads the transition towards a 100% renewable energy future.” Source: RevenueBase Database · checked Aug 31, 2026
24	BPA	Indirect evidence	Sainte-Therese, QC, CA	1,001-5,000	870 contacts →
	Indirect evidence “IMPACTFUL ENGINEERING At BPA, it’s simple: we are building experts.” Source: RevenueBase Database · checked Aug 31, 2026
25	Willdan	Indirect evidence	Anaheim, CA, US	1,001-5,000	838 contacts →
	Indirect evidence “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Source: RevenueBase Database · checked Aug 31, 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 consultancy 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 energy consultancy companies.
Partial evidence: Its own public description names part of clean energy consultancy companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean energy consultancy 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 31,075 clean energy consultancy companies worldwide

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Clean energy consultancy companies worldwide at a glance

As of Aug 31, 2026

33.3%Verified-email coverage

11.8%Mobile-number coverage

15.1Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

18,982

11-50

9,055

51-200

2,075

201-500

437

501-1,000

124

1,001-5,000

108

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 clean energy consultancy 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: 65 countries, largest first: the United States, the United Kingdom, Brazil, France, Spain, Germany, Italy, India, the Netherlands, Australia and 55 more. Country and city lists for clean energy consultancy companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “clean energy consultancy 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 energy consultancy 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 energy consultancy 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, 156,159 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 between August 31, 2026 and September 14, 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 consultancy companies by location

176 lists · largest first

Every Clean energy consultancy 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 energy consultancy 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 energy consultancy companies are there worldwide?

RevenueBase identified 31,075 clean energy consultancy companies worldwide as of August 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?

Worley, headquartered in Sydney, tops this list with the largest team on record.

Which country has the most clean energy consultancy companies?

The United States leads with 4,153 companies, followed by the United Kingdom (2,597) and Brazil (2,555). Every clean energy consultancy companies list by country and city is linked on this page.

Which city has the most clean energy consultancy companies?

London leads with 596 headquartered companies, followed by Sao Paulo (372) and Madrid (356).

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 156,159 verified decision-maker contacts tracked across these 31,075 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between August 31, 2026 and September 14, 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.