Company lists · Data refreshed September 2026

Top 25 Decarbonization consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 13,624 companies tracked

RevenueBase identified 13,624 company matches for decarbonization consulting firms worldwide as of September 2026 and tracks 258,427 professional contacts across them, including 80,864 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for decarbonization 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 28, 2026. Country and city lists for decarbonization 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 28, 2026 How this list was built

13,624Companies

258,427Contacts tracked

80,864Verified emails

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The 25 largest decarbonization consulting firms worldwide

Ranked by team size

Top 25 of 13,624 company matches for decarbonization consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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	Johnson Controls	Exact match	Cork, IrelandHQ recorded Sep 28, 2026	10001+	52,736 contacts →
	Exact match “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Worley	Exact match	Sydney, AustraliaHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
3	Engie Solutions France	Exact match	La Garenne-colombes, FranceHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
4	ERM	Exact match	London, United KingdomHQ recorded Sep 28, 2026	5,001-10,000	9,119 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Sep 28, 2026	10001+	8,427 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Johnson Matthey	Exact match	London, ItalyHQ recorded Sep 28, 2026	5,001-10,000	8,053 contacts →
	Exact match “Johnson Matthey (JM) is a world leader in platinum group metals (PGMs).” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Sargent & Lundy	Exact match	Chicago, WY, United StatesHQ recorded Sep 28, 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 · Sep 28, 2026 · View company records in RevenueBase
8	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
9	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
10	Baycurrent	Exact match	港区, JapanHQ recorded Sep 28, 2026	5,001-10,000	1,900 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
12	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
13	Aden Group	Exact match	SingaporeHQ recorded Sep 28, 2026	10001+	1,105 contacts →
	Exact match “Aden Group is a Euro-Asian enterprise delivering comprehensive solutions to boost decarbonization, productivity and energy transition in the built environment.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Anthesis Group	Exact match	London, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	894 contacts →
	Exact match “Anthesis guides clients to sustainable performance.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	South Pole	Exact match	Zurich, SwitzerlandHQ recorded Sep 28, 2026	501-1,000	811 contacts →
	Exact match “South Pole is the world's leading carbon asset developer and climate consultancy.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
17	RWDI	Exact match	Guelph, ON, CanadaHQ recorded Sep 28, 2026	501-1,000	737 contacts →
	Exact match “We are a leading global climate and performance engineering consulting firm dedicated to creating harmony between the built and natural world.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Cleanmax	Exact match	Mumbai, IndiaHQ recorded Sep 28, 2026	201-500	735 contacts →
	Exact match “CleanMax is India’s largest commercial and industrial (“C&I”) renewable energy provider with 3 GW of operational, owned and managed capacity.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 28, 2026	501-1,000	733 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Inerco	Exact match	Sevilla, SpainHQ recorded Sep 28, 2026	1,001-5,000	688 contacts →
	Exact match “INERCO, with 30 years of experience, offers comprehensive services and develops advanced technologies that contribute to sustainable industrial development, acting as a leader in…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	KBC A Yokogawa Company	Exact match	Walton-on-thames, United KingdomHQ recorded Sep 28, 2026	201-500	658 contacts →
	Exact match “We are passionate about driving sustainable change for our planet.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	WTS Energy	Exact match	The Hague, NetherlandsHQ recorded Sep 28, 2026	1,001-5,000	651 contacts →
	Exact match “The Energy Transition brings new challenges and opportunities to all of us.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	ACT Group	Exact match	Amsterdam, NetherlandsHQ recorded Sep 28, 2026	501-1,000	556 contacts →
	Exact match “As the leading environmental solutions partner for organizations globally, ACT helps its partners meet increasing environmental action and disclosure expectations from regulators…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	STX Group	Exact match	Amsterdam, NetherlandsHQ recorded Sep 28, 2026	501-1,000	502 contacts →
	Exact match “STX Group is a leading global firm in environmental commodities trading and climate finance.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Amara Nzero Brasil	Exact match	Salvador, BrazilHQ recorded Sep 28, 2026	501-1,000	493 contacts →
	Exact match “Somos uma empresa com uma grande experiência integral em energia sustentável fortemente comprometida com a Transição Energética.” Recorded in the RevenueBase company graph · Sep 28, 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 “decarbonization 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 13,624 decarbonization consulting firms worldwide

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Decarbonization consulting firms worldwide at a glance

As of Sep 28, 2026

31.3%Verified-email coverage

19.0Average contacts per company

1-10Median size (employees)

2.6%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

9,644

11-50

3,103

51-200

615

201-500

120

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 decarbonization consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “decarbonization 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 80,864 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 28, 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.

Decarbonization consulting firms by location

81 lists · largest first

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

How many decarbonization consulting firms are there worldwide?

RevenueBase identified 13,624 company matches for decarbonization 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?

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

Which country has the most decarbonization consulting firms?

The United States leads with 1,808 companies, followed by the United Kingdom (1,123) and France (1,048). Every decarbonization consulting firms list by country and city is linked on this page.

Which city has the most decarbonization consulting firms?

London leads with 355 company records, followed by Paris (218) and Madrid (143).

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 80,864 professional contacts with verified work emails tracked across these 13,624 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 28, 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.