Company lists · Data refreshed October 2026

Top 25 Clean energy transition consultants worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 9, 2026 13,290 companies tracked

RevenueBase identified 13,290 company matches for clean energy transition consultants worldwide as of October 2026 and tracks 211,920 professional contacts across them, including 67,970 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for clean energy transition consultants 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 transition consultants 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

13,290Companies

211,920Contacts tracked

67,970Verified emails

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The 25 largest clean energy transition consultants worldwide

Ranked by team size

Top 25 of 13,290 company matches for clean energy transition consultants 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	WOOD	Exact match	Aberdeen, United KingdomHQ recorded Oct 9, 2026	10001+	16,351 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 9, 2026 · View company records in RevenueBase
3	Engie Solutions France	Exact match	La Garenne-colombes, FranceHQ recorded Oct 9, 2026	10001+	11,566 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 · Oct 9, 2026 · View company records in RevenueBase
4	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
5	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
6	Baycurrent	Exact match	港区, JapanHQ recorded Oct 9, 2026	5,001-10,000	2,164 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,801 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 9, 2026 · View company records in RevenueBase
8	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,513 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 9, 2026 · View company records in RevenueBase
9	Fichtner	Exact match	Stuttgart, GermanyHQ recorded Oct 9, 2026	1,001-5,000	1,349 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 9, 2026 · View company records in RevenueBase
10	VITO	Exact match	Mol, BelgiumHQ recorded Oct 9, 2026	1,001-5,000	1,139 contacts →
	Exact match “VITO is an independent Flemish research organisation in the area of cleantech and sustainable development.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11	Wärtsilä Energy	Exact match	Helsinki, FinlandHQ recorded Oct 9, 2026	10001+	965 contacts →
	Exact match “Wärtsilä leads the transition towards a 100% renewable energy future.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
12	Anthesis Group	Exact match	London, United KingdomHQ recorded Oct 9, 2026	1,001-5,000	927 contacts →
	Exact match “Anthesis guides clients to sustainable performance.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	872 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 9, 2026 · View company records in RevenueBase
14	Cleanmax	Exact match	Mumbai, IndiaHQ recorded Oct 9, 2026	201-500	809 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 · Oct 9, 2026 · View company records in RevenueBase
15	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Oct 9, 2026	501-1,000	774 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	South Pole	Exact match	Zurich, SwitzerlandHQ recorded Oct 9, 2026	501-1,000	744 contacts →
	Exact match “South Pole is the world's leading carbon asset developer and climate consultancy.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17	Inerco	Exact match	Seville, SpainHQ recorded Oct 9, 2026	1,001-5,000	735 contacts →
	Exact match “INERCO is a multinational technology company specialising in sustainability.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	Vikran Engineering LTD	Exact match	Thane, IndiaHQ recorded Oct 9, 2026	501-1,000	703 contacts →
	Exact match “M/s VIKRAN Engineering Ltd is a reputed and established engineering company specializing in providing comprehensive solutions in the fields of renewable energy, engineering…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	WTS Energy	Exact match	The Hague, NetherlandsHQ recorded Oct 9, 2026	1,001-5,000	654 contacts →
	Exact match “The Energy Transition brings new challenges and opportunities to all of us.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20	E CO	Exact match	London, United KingdomHQ recorded Oct 9, 2026	n/a	639 contacts →
	Exact match “For over 26 years, our consultants have been supporting and guiding our clients to achieve low-carbon climate-resilient development.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21	Ricardo PLC	Exact match	London, United KingdomHQ recorded Oct 9, 2026	1,001-5,000	627 contacts →
	Exact match “Click the 'Follow' button and explore careers at Ricardo on our 'Jobs' and 'Life' tabs and at careers.ricardo.com.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22	Revergy	Exact match	Seville, SpainHQ recorded Oct 9, 2026	501-1,000	538 contacts →
	Exact match “REVERGY nace mediante un proyecto de profesionales procedentes de diferentes ámbitos del sector de las energías renovables con el fin de presentar un proyecto marcado por la…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	Amara Nzero Brasil	Exact match	Salvador, BrazilHQ recorded Oct 9, 2026	501-1,000	531 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 · Oct 9, 2026 · View company records in RevenueBase
24	Serentica	Exact match	Gurgaon, IndiaHQ recorded Oct 9, 2026	201-500	526 contacts →
	Exact match “Serentica Renewables India Private Limited,(Serentica) is a is an end-to-end energy solutions company enabling large-scale heavy energy intensive industries and sector to…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
25	Natural Power	Exact match	Castle Douglas, United KingdomHQ recorded Oct 9, 2026	501-1,000	517 contacts →
	Exact match “Natural Power is a leading independent consultancy and service provider for the renewable energy sector.” 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 transition consultants”. 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 13,290 clean energy transition consultants worldwide

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Clean energy transition consultants worldwide at a glance

As of Oct 9, 2026

32.1%Verified-email coverage

15.9Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · London

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

8,943

11-50

3,323

51-200

712

201-500

137

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 clean energy transition consultants are linked below.
What qualifies: Company records worldwide whose business descriptions match “clean energy transition consultants” 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 67,970 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 transition consultants by location

81 lists · largest first

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

How many clean energy transition consultants are there worldwide?

RevenueBase identified 13,290 company matches for clean energy transition consultants 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 transition consultants?

The United States leads with 1,591 companies, followed by France (948) and the United Kingdom (890). Every clean energy transition consultants list by country and city is linked on this page.

Which city has the most clean energy transition consultants?

London leads with 310 company records, followed by Paris (203) and Madrid (127).

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 67,970 professional contacts with verified work emails tracked across these 13,290 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.