Company lists · Data refreshed September 2026

Top 25 Sustainable energy consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 33,368 companies tracked

RevenueBase identified 33,368 company matches for sustainable energy consulting firms worldwide as of September 2026 and tracks 420,002 professional contacts across them, including 140,744 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for sustainable 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 September 21, 2026. Country and city lists for sustainable 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 Sep 21, 2026 How this list was built

33,368Companies

420,002Contacts tracked

140,744Verified emails

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The 25 largest sustainable energy consulting firms worldwide

Ranked by team size

Top 25 of 33,368 company matches for sustainable energy consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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 Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
2	Stantec	Exact match	Edmonton, AB, CanadaHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
3	WOOD	Exact match	Aberdeen, United KingdomHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
4	Engie Solutions France	Exact match	La Garenne-colombes, FranceHQ recorded Sep 21, 2026	10001+	12,011 contacts →
	Exact match “Les activités Infrastructures Energétiques Locales d’ENGIE accompagnent les collectivités, les industries et le secteur du bâtiment sur la voie de la décarbonation.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	ERM	Exact match	London, United KingdomHQ recorded Sep 21, 2026	5,001-10,000	9,119 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Sep 21, 2026	10001+	8,427 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	SLR Consulting	Exact match	London, United KingdomHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
8	FTI	Exact match	Menasha, WI, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
9	APTIM	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	2,639 contacts →
	Exact match “APTIM enhances the quality of the environment, wellbeing of people, resilience of communities, and opportunity for employees to make a difference, not just a living.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	WSP I Sverige	Exact match	Stockholm-marievik, SwedenHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
11	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
12	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
13	Baycurrent	Exact match	港区, JapanHQ recorded Sep 21, 2026	5,001-10,000	1,900 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
15	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,629 contacts →
	Exact match “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Vulcain Engineering Group	Exact match	Neuilly-sur-seine, FranceHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
17	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
18	Fichtner	Exact match	Stuttgart, GermanyHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
19	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
20	TSE	Exact match	São Paulo/sp, BrazilHQ recorded Sep 21, 2026	5,001-10,000	1,067 contacts →
	Exact match “Somos a TSE - Total Sustainable Engineering.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Penspen	Exact match	London, United KingdomHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
22	BPA	Exact match	Montréal, QC, CanadaHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
23	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
24	Tauw Nederland	Exact match	Deventer, NetherlandsHQ recorded Sep 21, 2026	1,001-5,000	800 contacts →
	Exact match “TAUW is een Europees advies- en ingenieursbureau.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Sep 21, 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 · Sep 21, 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 “sustainable 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 33,368 sustainable energy consulting firms worldwide

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Sustainable energy consulting firms worldwide at a glance

As of Sep 21, 2026

33.5%Verified-email coverage

12.6Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

22,196

11-50

8,647

51-200

1,789

201-500

366

501-1,000

1,001-5,000

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 sustainable energy consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “sustainable 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 140,744 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 September 21, 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.

Sustainable energy consulting firms by location

138 lists · largest first

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

How many sustainable energy consulting firms are there worldwide?

RevenueBase identified 33,368 company matches for sustainable energy consulting firms worldwide as of September 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 sustainable energy consulting firms?

The United States leads with 4,055 companies, followed by Brazil (2,197) and the United Kingdom (1,966). Every sustainable energy consulting firms list by country and city is linked on this page.

Which city has the most sustainable energy consulting firms?

London leads with 545 company records, followed by Sao Paulo (335) and Paris (328).

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 140,744 professional contacts with verified work emails tracked across these 33,368 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 September 21, 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.