Company lists · Data refreshed October 2026

Top 25 Clean energy consultancy companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 35,431 companies tracked

RevenueBase identified 35,431 company matches for clean energy consultancy companies worldwide as of October 2026 and tracks 391,837 professional contacts across them, including 115,850 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for clean energy consultancy companies 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 1, 2026. Country and city lists for clean energy consultancy companies 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 1, 2026 How this list was built

35,431Companies

391,837Contacts tracked

115,850Verified emails

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The 25 largest clean energy consultancy companies worldwide

Ranked by team size

Top 25 of 35,431 company matches for clean energy consultancy companies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 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 1, 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 · Oct 1, 2026 · View company records in RevenueBase
2	ERM	Exact match	London, United KingdomHQ recorded Oct 1, 2026	5,001-10,000	9,119 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Oct 1, 2026	10001+	8,427 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	EDP	Exact match	Lisbon, PortugalHQ recorded Oct 1, 2026	10001+	6,435 contacts →
	Exact match “Our story began 50 years ago.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	RENEW	Exact match	Gurgaon, IndiaHQ recorded Oct 1, 2026	1,001-5,000	4,340 contacts →
	Exact match “ReNew is a leading decarbonisation solutions provider and the first Indian clean energy company to list on Nasdaq (Nasdaq: RNW).” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	FTI	Exact match	Menasha, WI, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
7	Tata Power Renewable Energy Limited	Exact match	Mumbai, IndiaHQ recorded Oct 1, 2026	501-1,000	2,660 contacts →
	Exact match “Tata Power Renewable Energy Limited (TPREL) is one of India’s leading renewable energy companies, driving the transition towards a cleaner, more resilient and sustainable energy…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
9	Voltalia	Exact match	Paris, FranceHQ recorded Oct 1, 2026	1,001-5,000	1,436 contacts →
	Exact match “Voltalia is an international player in renewable energies.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
11	Solv Energy	Exact match	San Diego, CA, United StatesHQ recorded Oct 1, 2026	1,001-5,000	1,286 contacts →
	Exact match “SOLV Energy is a renewable energy solutions provider for utility solar, energy storage, and high voltage projects in North America.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Casa DOS Ventos Energias Renováveis	Exact match	Sao Paulo, BrazilHQ recorded Oct 1, 2026	501-1,000	1,269 contacts →
	Exact match “A Casa dos Ventos é uma empresa brasileira que desenvolve, constrói e opera projetos de geração de energia a partir de fontes renováveis e tem atuado como protagonista na…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	OLA	Exact match	Austin, TX, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
14	Penspen	Exact match	London, United KingdomHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
15	CTG Brasil	Exact match	Sao Paulo, BrazilHQ recorded Oct 1, 2026	501-1,000	988 contacts →
	Exact match “Na CTG Brasil, trabalhamos por um único propósito: desenvolver o mundo com energia limpa em larga escala.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Inox Wind LTD	Exact match	Noida, IndiaHQ recorded Oct 1, 2026	1,001-5,000	952 contacts →
	Exact match “Inox Wind is India’s leading wind energy solutions provider, offering comprehensive services from concept to commissioning and Operations & Maintenance (O&M).” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	Wärtsilä Energy	Exact match	Helsinki, FinlandHQ recorded Oct 1, 2026	10001+	940 contacts →
	Exact match “Wärtsilä leads the transition towards a 100% renewable energy future.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Wanzek Construction, Inc., A Mastec Company	Exact match	Fargo, ND, United StatesHQ recorded Oct 1, 2026	1,001-5,000	933 contacts →
	Exact match “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
20	South Pole	Exact match	Zurich, SwitzerlandHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
21	ABO Energy	Exact match	Wiesbaden, GermanyHQ recorded Oct 1, 2026	1,001-5,000	785 contacts →
	Exact match “Founded in 1996, ABO Energy (fomerly known as ABO Wind) is among Europe’s leading developers of renewable energy projects.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Juwi Group	Exact match	Wörrstadt, GermanyHQ recorded Oct 1, 2026	1,001-5,000	785 contacts →
	Exact match “For 30 years, we have been one of the leading specialists in renewable energies, offering complete project development and other services related to the planning, construction…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
24	NWG S.P.A	Exact match	Prato, ItalyHQ recorded Oct 1, 2026	n/a	766 contacts →
	Exact match “Nata a Prato nel 2003 è oggi una delle più importanti realtà nel mercato della Green Economy.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Cleanmax	Exact match	Mumbai, IndiaHQ recorded Oct 1, 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 · Oct 1, 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 consultancy companies”. 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 35,431 clean energy consultancy companies worldwide

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Clean energy consultancy companies worldwide at a glance

As of Oct 1, 2026

29.6%Verified-email coverage

11.1Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

21,116

11-50

10,703

51-200

2,582

201-500

560

501-1,000

147

1,001-5,000

126

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 consultancy companies are linked below.
What qualifies: Company records worldwide whose business descriptions match “clean energy consultancy companies” 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 115,850 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 1, 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 consultancy companies by location

185 lists · largest first

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

How many clean energy consultancy companies are there worldwide?

RevenueBase identified 35,431 company matches for clean energy consultancy companies 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 consultancy companies?

The United States leads with 4,153 companies, followed by the United Kingdom (2,597) and Brazil (2,555). Every clean energy consultancy companies list by country and city is linked on this page.

Which city has the most clean energy consultancy companies?

London leads with 490 company records, followed by Madrid (335) and Sao Paulo (266).

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 115,850 professional contacts with verified work emails tracked across these 35,431 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 1, 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.