Company lists · Data refreshed October 2026

Top 25 Clean energy consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 36,225 companies tracked

RevenueBase identified 36,225 company matches for clean energy consulting firms worldwide as of October 2026 and tracks 459,525 professional contacts across them, including 150,843 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for clean energy consulting 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 1, 2026. Country and city lists for clean energy consulting 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 1, 2026 How this list was built

36,225Companies

459,525Contacts tracked

150,843Verified emails

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The 25 largest clean energy consulting firms worldwide

Ranked by team size

Top 25 of 36,225 company matches for clean energy consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 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 1, 2026	10001+	34,763 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 1, 2026 · View company records in RevenueBase
2	Stantec	Exact match	Edmonton, AB, CanadaHQ recorded Oct 1, 2026	10001+	28,416 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 1, 2026 · View company records in RevenueBase
3	WOOD	Exact match	Aberdeen, United KingdomHQ recorded Oct 1, 2026	10001+	26,949 contacts →
	Exact match “Wood is a global leader in consulting and engineering, delivering critical solutions across energy and materials markets.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	ERM	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	9,119 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Oct 1, 2026	10001+	8,427 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Roland Berger	Exact match	Munich, GermanyHQ recorded Oct 1, 2026	1,001-5,000	4,632 contacts →
	Exact match “Roland Berger is the only leading global strategy consultancy of European origin.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Sargent & Lundy	Exact match	Chicago, WY, United StatesHQ recorded Oct 1, 2026	1,001-5,000	4,156 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 1, 2026 · View company records in RevenueBase
8	SLR Consulting	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	3,848 contacts →
	Exact match “SLR is a committed partner in our clients’ sustainability journeys.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	FTI	Exact match	Menasha, WI, United StatesHQ recorded Oct 1, 2026	1,001-5,000	2,741 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 1, 2026 · View company records in RevenueBase
10	WSP I Sverige	Exact match	Stockholm-marievik, SwedenHQ recorded Oct 1, 2026	10001+	2,607 contacts →
	Exact match “What if you could shape built and natural environments – and the future of those that use them?” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	1,001-5,000	2,213 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 1, 2026 · View company records in RevenueBase
12	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 1, 2026	1,001-5,000	2,121 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 1, 2026 · View company records in RevenueBase
13	Baycurrent	Exact match	港区, JapanHQ recorded Oct 1, 2026	5,001-10,000	1,900 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Oct 1, 2026	1,001-5,000	1,661 contacts →
	Exact match “At Westwood, our purpose is to create a better world for people through our work.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Vulcain Engineering Group	Exact match	Neuilly-sur-seine, FranceHQ recorded Oct 1, 2026	5,001-10,000	1,496 contacts →
	Exact match “Vulcain Engineering Group is a multi-specialist engineering and consulting group serving industrial companies across the globe, focused on critical sectors: energy, health…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Oct 1, 2026	1,001-5,000	1,383 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	IPE Global Limited	Exact match	New Delhi, IndiaHQ recorded Oct 1, 2026	501-1,000	1,322 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Fichtner	Exact match	Stuttgart, GermanyHQ recorded Oct 1, 2026	1,001-5,000	1,279 contacts →
	Exact match “As a leading, independent engineering and consultancy enterprise active in the sectors of energy and infrastructure, Fichtner handles challenging projects in countries all over…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	OLA	Exact match	Austin, TX, United StatesHQ recorded Oct 1, 2026	n/a	1,145 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	Gruppo AB	Exact match	Orzinuovi, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	1,081 contacts →
	Exact match “Since 1981, AB has tackled the challenges posed by energy sustainability, working alongside our customers to improve their competitiveness while saving energy and reducing…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	Penspen	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	1,007 contacts →
	Exact match “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Anthesis Group	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	894 contacts →
	Exact match “Anthesis guides clients to sustainable performance.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	BPA	Exact match	Montréal, QC, CanadaHQ recorded Oct 1, 2026	1,001-5,000	882 contacts →
	Exact match “IMPACTFUL ENGINEERING At BPA, it’s simple: we are building experts.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Oct 1, 2026	1,001-5,000	851 contacts →
	Exact match “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Oct 1, 2026	201-500	772 contacts →
	Exact match “Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.” Recorded in the RevenueBase company graph · Oct 1, 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 consulting 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 36,225 clean energy consulting firms worldwide

See the full list, filter by size, metro and specialty, and access 150,843 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Clean energy consulting firms worldwide at a glance

As of Oct 1, 2026

32.8%Verified-email coverage

12.7Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

23,196

11-50

9,938

51-200

2,198

201-500

479

501-1,000

130

1,001-5,000

118

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 consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “clean energy consulting 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 150,843 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 1, 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 consulting firms by location

178 lists · largest first

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

How many clean energy consulting firms are there worldwide?

RevenueBase identified 36,225 company matches for clean energy consulting 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 consulting firms?

The United States leads with 4,875 companies, followed by Brazil (2,405) and the United Kingdom (2,056). Every clean energy consulting firms list by country and city is linked on this page.

Which city has the most clean energy consulting firms?

London leads with 571 company records, followed by Paris (357) and Sao Paulo (348).

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 150,843 professional contacts with verified work emails tracked across these 36,225 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 1, 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.