Company lists · Data refreshed September 2026

Top 25 Cleantech consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 12,164 companies tracked

RevenueBase identified 12,164 company matches for cleantech consulting firms worldwide as of September 2026 and tracks 86,615 professional contacts across them, including 25,667 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for cleantech 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 cleantech 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

12,164Companies

86,615Contacts tracked

25,667Verified emails

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The 25 largest cleantech consulting firms worldwide

Ranked by team size

Top 25 of 12,164 company matches for cleantech 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	Montrose Environmental Group	Exact match	Little Rock, AR, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,529 contacts →
	Exact match “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	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
3	Inerco	Exact match	Sevilla, SpainHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
4	Revergy	Exact match	Seville, SpainHQ recorded Sep 21, 2026	501-1,000	502 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 · Sep 21, 2026 · View company records in RevenueBase
5	Natural Power	Exact match	Castle Douglas, United KingdomHQ recorded Sep 21, 2026	501-1,000	500 contacts →
	Exact match “Natural Power is a leading independent consultancy and service provider for the renewable energy sector.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Mitcon Consultancy And Engineering Services LTD	Exact match	Pune, IndiaHQ recorded Sep 21, 2026	201-500	486 contacts →
	Exact match “MITCON Consultancy & Engineering Services Limited, an ISO 9001:2015 certified company & NSE listed company, was established in 1982.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Chakr Innovation	Exact match	Gurugram, IndiaHQ recorded Sep 21, 2026	501-1,000	476 contacts →
	Exact match “Chakr Innovation is a pioneering Indian cleantech startup, founded by IIT Delhi graduates, dedicated to revolutionizing air quality with cutting-edge material science technology.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Fichtner Consulting Engineers LTD	Exact match	Stockport, United KingdomHQ recorded Sep 21, 2026	51-200	418 contacts →
	Exact match “Fichtner is one of the world's leading independent engineering consultancy firms.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Greenflex	Exact match	Paris, FranceHQ recorded Sep 21, 2026	501-1,000	390 contacts →
	Exact match “Since 2009, GreenFlex has been a key partner in the energy, environmental and societal transformation of organizations, enabling them to change their trajectory towards an economy…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 21, 2026	201-500	383 contacts →
	Exact match “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 21, 2026	201-500	375 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	EMM Consulting PTY Limited	Exact match	St Leonards, AustraliaHQ recorded Sep 21, 2026	201-500	361 contacts →
	Exact match “At EMM, we believe that a sustainable future is achievable, and we are dedicated to helping our clients and the community make it a reality.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Triton Environmental Consultants LTD	Exact match	Vancouver, BC, CanadaHQ recorded Sep 21, 2026	201-500	351 contacts →
	Exact match “Triton Environmental Consultants knows western Canada.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	AESA	Exact match	Barcelona, SpainHQ recorded Sep 21, 2026	n/a	351 contacts →
	Exact match “Ingeniería y Consultoría Energética orientada a la búsqueda y el desarrollo de soluciones energéticas de alta eficiencia para sus Clientes.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	ETP CC	Exact match	AustraliaHQ recorded Sep 21, 2026	n/a	320 contacts →
	Exact match “Management Consulting in the Energy Sector” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	EIC Partnership	Exact match	Redditch, United KingdomHQ recorded Sep 21, 2026	51-200	316 contacts →
	Exact match “EIC Partnership: A Legacy of Expertise, A Commitment to Sustainability With origins dating back to 1975, EIC has cultivated nearly 50 years of distinguished service in energy and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 21, 2026	201-500	305 contacts →
	Exact match “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Sólida	Exact match	Madrid, SpainHQ recorded Sep 21, 2026	201-500	298 contacts →
	Exact match “SÓLIDA, a Bureau Veritas Company, is an independent company founded in 2007 that provides high added-value engineering and consulting services within the renewable energy sector.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Sep 21, 2026	201-500	288 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Deode Energia	Exact match	Juiz De Fora, BrazilHQ recorded Sep 21, 2026	201-500	280 contacts →
	Exact match “A DEODE Energia foi fundada em 2012 proveniente da HF Energy.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Eodd Ingénieurs Conseils	Exact match	Villeurbanne, FranceHQ recorded Sep 21, 2026	201-500	278 contacts →
	Exact match “Créé en 1991, reconnu comme l’un des meilleurs cabinets français spécialiste de la transformation écologique, EODD ingénieurs conseils apporte sa vision transversale et ses…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Infinity	Exact match	Cairo, EgyptHQ recorded Sep 21, 2026	201-500	272 contacts →
	Exact match “Established in 2014, Infinity is the only dedicated renewable energy solutions provider in Egypt that develops clean energy solutions across several sectors and scales.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Merjent	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 21, 2026	201-500	264 contacts →
	Exact match “Merjent is an environmental, restoration, and engineering consulting firm with a long history serving the energy industry.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	PSC Consulting	Exact match	Kirkland, WA, United StatesHQ recorded Sep 21, 2026	201-500	254 contacts →
	Exact match “We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Valora Consultores	Exact match	Madrid, United KingdomHQ recorded Sep 21, 2026	51-200	241 contacts →
	Exact match “VALORA is a consulting company who focus its activity towards a new professional innovative and thrilling challenge.” 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 “cleantech 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 12,164 cleantech consulting firms worldwide

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Cleantech consulting firms worldwide at a glance

As of Sep 21, 2026

29.6%Verified-email coverage

7.1Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

8,462

11-50

2,966

51-200

533

201-500

108

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 cleantech consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “cleantech 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 25,667 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.

Cleantech consulting firms by location

57 lists · largest first

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

How many cleantech consulting firms are there worldwide?

RevenueBase identified 12,164 company matches for cleantech 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?

Montrose Environmental Group tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most cleantech consulting firms?

The United States leads with 1,593 companies, followed by Brazil (947) and France (551). Every cleantech consulting firms list by country and city is linked on this page.

Which city has the most cleantech consulting firms?

London leads with 160 company records, followed by Sao Paulo (151) and Madrid (120).

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 25,667 professional contacts with verified work emails tracked across these 12,164 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.