Company lists · Data refreshed November 2026

Top 25 Cleantech consultants worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 12,007 companies tracked

RevenueBase identified 12,007 company matches for cleantech consultants worldwide as of November 2026 and tracks 90,224 professional contacts across them, including 26,366 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for cleantech 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 November 6, 2026. Country and city lists for cleantech 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 Nov 6, 2026 How this list was built

12,007Companies

90,224Contacts tracked

26,366Verified emails

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The 25 largest cleantech consultants worldwide

Ranked by team size

Top 25 of 12,007 company matches for cleantech consultants worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	OLA	Exact match	Austin, TX, United StatesHQ recorded Nov 6, 2026	n/a	1,164 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 · Nov 6, 2026 · View company records in RevenueBase
2	VITO	Exact match	Mol, BelgiumHQ recorded Nov 6, 2026	1,001-5,000	1,153 contacts →
	Exact match “VITO is an independent Flemish research organisation in the area of cleantech and sustainable development.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Nov 6, 2026	201-500	815 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 · Nov 6, 2026 · View company records in RevenueBase
4	Resource Innovations	Exact match	Half Moon Bay, OR, United StatesHQ recorded Nov 6, 2026	501-1,000	793 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Inerco	Exact match	Seville, SpainHQ recorded Nov 6, 2026	1,001-5,000	755 contacts →
	Exact match “INERCO is a multinational technology company specialising in sustainability.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Serentica	Exact match	Gurgaon, IndiaHQ recorded Nov 6, 2026	201-500	549 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 · Nov 6, 2026 · View company records in RevenueBase
7	Revergy	Exact match	Seville, SpainHQ recorded Nov 6, 2026	501-1,000	545 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 · Nov 6, 2026 · View company records in RevenueBase
8	ROUX	Exact match	Islandia, NY, United StatesHQ recorded Nov 6, 2026	201-500	474 contacts →
	Exact match “The Roux organization applies sophisticated scientific, technical, and managerial resources to develop and implement effective, efficient, and sustainable solutions to our…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Westport Fuel Systems	Exact match	Vancouver, BC, CanadaHQ recorded Nov 6, 2026	51-200	474 contacts →
	Exact match “Westport is a clean-tech innovation company, providing simplified solutions to decarbonize.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	ADP Consulting	Exact match	Melbourne, AustraliaHQ recorded Nov 6, 2026	201-500	472 contacts →
	Exact match “ADP Consulting, an Ayesa company, is a sustainability-led engineering consultancy on a quest to inspire a better world through influence and design.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Chakr Innovation	Exact match	Gurgaon, IndiaHQ recorded Nov 6, 2026	501-1,000	464 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 · Nov 6, 2026 · View company records in RevenueBase
12	Veregy	Exact match	Phoenix, AZ, United StatesHQ recorded Nov 6, 2026	501-1,000	413 contacts →
	Exact match “Veregy is an award-winning NAESCO-Accredited decarbonization company focusing on accelerating and simplifying the Energy Transition.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	TRIO	Exact match	Irvine, MA, United StatesHQ recorded Nov 6, 2026	201-500	393 contacts →
	Exact match “We are Trio – global energy and sustainability advisors.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	AESA	Exact match	Barcelona, SpainHQ recorded Nov 6, 2026	n/a	381 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 · Nov 6, 2026 · View company records in RevenueBase
15	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Nov 6, 2026	201-500	379 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to the West Coast and beyond for over 35 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	EMM Consulting PTY Limited	Exact match	St Leonards, AustraliaHQ recorded Nov 6, 2026	201-500	363 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 · Nov 6, 2026 · View company records in RevenueBase
17	Enfil S A	Exact match	São Paulo, BrazilHQ recorded Nov 6, 2026	1,001-5,000	358 contacts →
	Exact match “Com mais de 30 anos de atuação no mercado brasileiro, a Enfil é uma empresa referência em soluções ambientais para tratamento de água, efluentes e controle de emissões…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Deode Energia	Exact match	Juiz De Fora, BrazilHQ recorded Nov 6, 2026	201-500	323 contacts →
	Exact match “A DEODE Energia foi fundada em 2012 proveniente da HF Energy.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	CTE	Exact match	São Paulo, BrazilHQ recorded Nov 6, 2026	51-200	322 contacts →
	Exact match “CTE is a consulting company, which has 28 years of experience in the Construction Industry, offering clients consultancy across a wide range of service nable Projects and Green…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Nov 6, 2026	201-500	304 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Apollo Green Energy Limited	Exact match	Gurgaon, IndiaHQ recorded Nov 6, 2026	1,001-5,000	283 contacts →
	Exact match “Apollo Green Energy Limited (AGEL) is a leading EPC company specializing in renewable energy solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Sólida	Exact match	Madrid, SpainHQ recorded Nov 6, 2026	201-500	280 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 · Nov 6, 2026 · View company records in RevenueBase
23	Valora Consultores	Exact match	Madrid, SpainHQ recorded Nov 6, 2026	51-200	255 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 · Nov 6, 2026 · View company records in RevenueBase
24	GAP Ssma	Exact match	Goiânia, BrazilHQ recorded Nov 6, 2026	201-500	251 contacts →
	Exact match “A GAP Ambiental oferece serviços para pequenas, médias e grandes empresas em diversas áreas que vão desde o licenciamento ao acompanhamento da execução de projetos.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	ARQ	Exact match	Greenwood Village, CO, United StatesHQ recorded Nov 6, 2026	201-500	245 contacts →
	Exact match “Arq is a diversified, environmental technology company with products that enable a cleaner and safer planet while actively reducing our environmental impact.” Recorded in the RevenueBase company graph · Nov 6, 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 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 12,007 cleantech consultants worldwide

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Cleantech consultants worldwide at a glance

As of Nov 6, 2026

29.2%Verified-email coverage

7.5Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

8,218

11-50

2,939

51-200

568

201-500

126

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 consultants are linked below.
What qualifies: Company records worldwide whose business descriptions match “cleantech 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 26,366 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 November 6, 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 consultants by location

72 lists · largest first

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

How many cleantech consultants are there worldwide?

RevenueBase identified 12,007 company matches for cleantech consultants worldwide as of November 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?

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

Which country has the most cleantech consultants?

The United States leads with 2,101 companies, followed by Brazil (689) and India (666). Every cleantech consultants list by country and city is linked on this page.

Which city has the most cleantech consultants?

London leads with 173 company records, followed by Sao Paulo (115) and Paris (104).

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 26,366 professional contacts with verified work emails tracked across these 12,007 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 November 6, 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.