Company lists · Data refreshed October 2026

Top 25 Green energy consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 32,110 companies tracked

RevenueBase identified 32,110 company matches for green energy consulting firms worldwide as of October 2026 and tracks 276,868 professional contacts across them, including 85,665 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for green energy 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 October 1, 2026. Country and city lists for green energy 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 Oct 1, 2026 How this list was built

32,110Companies

276,868Contacts tracked

85,665Verified emails

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The 25 largest green energy consulting firms worldwide

Ranked by team size

Top 25 of 32,110 company matches for green energy consulting firms 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	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
2	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
3	SLR Consulting	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	3,848 contacts →
	Exact match “SLR is a committed partner in our clients’ sustainability journeys.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	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
5	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Oct 1, 2026	1,001-5,000	1,661 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 1, 2026 · View company records in RevenueBase
6	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
7	Fichtner	Exact match	Stuttgart, GermanyHQ recorded Oct 1, 2026	1,001-5,000	1,279 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 1, 2026 · View company records in RevenueBase
8	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
9	TSE	Exact match	São Paulo/sp, BrazilHQ recorded Oct 1, 2026	5,001-10,000	1,067 contacts →
	Exact match “Somos a TSE - Total Sustainable Engineering.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	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
11	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
12	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
13	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
14	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
15	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Oct 1, 2026	501-1,000	733 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	LUMIO	Exact match	Lehi, UT, United StatesHQ recorded Oct 1, 2026	5,001-10,000	719 contacts →
	Exact match “We’re on a mission to make power personal.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	PD	Exact match	Berlin, GermanyHQ recorded Oct 1, 2026	1,001-5,000	702 contacts →
	Exact match “Die PD ist die Beratung / Für die öffentliche Hand von morgen / Seit 2008 beraten wir ausschließlich öffentliche Auftraggeber zu moderner Verwaltungsarbeit und…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Inerco	Exact match	Seville, SpainHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
19	Vikran Engineering LTD	Exact match	Thane, IndiaHQ recorded Oct 1, 2026	501-1,000	661 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 1, 2026 · View company records in RevenueBase
20	SSE Airtricity	Exact match	IrelandHQ recorded Oct 1, 2026	501-1,000	661 contacts →
	Exact match “SSE Airtricity has been harnessing our greatest natural resource for the past 25 years, providing cleaner, renewable energy† for homes and businesses across the country.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	WTS Energy	Exact match	The Hague, NetherlandsHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
22	E CO	Exact match	London, United KingdomHQ recorded Oct 1, 2026	n/a	621 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 1, 2026 · View company records in RevenueBase
23	Grupotec	Exact match	Valencia, SpainHQ recorded Oct 1, 2026	501-1,000	538 contacts →
	Exact match “GRUPOTEC - Empresa multidisciplinar de ingeniería y arquitectura y líder en el sector de la energía fotovoltaica.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	Northern GAS And Power	Exact match	Gateshead, United KingdomHQ recorded Oct 1, 2026	501-1,000	509 contacts →
	Exact match “As leaders in our field, we’re trusted by over businesses to provide a full energy service.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Revergy	Exact match	Seville, SpainHQ recorded Oct 1, 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 · 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 “green energy 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 32,110 green energy consulting firms worldwide

See the full list, filter by size, metro and specialty, and access 85,665 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Green energy consulting firms worldwide at a glance

As of Oct 1, 2026

30.9%Verified-email coverage

8.6Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

20,979

11-50

8,618

51-200

1,820

201-500

370

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 green energy consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “green energy 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 85,665 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.

Green energy consulting firms by location

164 lists · largest first

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

How many green energy consulting firms are there worldwide?

RevenueBase identified 32,110 company matches for green energy consulting firms 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?

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

Which country has the most green energy consulting firms?

The United States leads with 4,315 companies, followed by Brazil (1,954) and the United Kingdom (1,859). Every green energy consulting firms list by country and city is linked on this page.

Which city has the most green energy consulting firms?

London leads with 471 company records, followed by Paris (327) and Sao Paulo (301).

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 85,665 professional contacts with verified work emails tracked across these 32,110 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.