Company lists · Data refreshed October 2026

Top 25 Energy efficiency consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 13,798 companies tracked

RevenueBase identified 13,798 company matches for energy efficiency consulting firms worldwide as of October 2026 and tracks 139,448 professional contacts across them, including 45,064 with verified work emails. The United States is the largest market and Paris the largest hub.

This list covers company matches for energy efficiency 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 energy efficiency 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

13,798Companies

139,448Contacts tracked

45,064Verified emails

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The 25 largest energy efficiency consulting firms worldwide

Ranked by team size

Top 25 of 13,798 company matches for energy efficiency 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	British GAS	Exact match	Windsor, United KingdomHQ recorded Oct 1, 2026	10001+	9,238 contacts →
	Exact match “Taking care of things.” 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	Enova By Veolia	Exact match	Dubai, United Arab EmiratesHQ recorded Oct 1, 2026	5,001-10,000	4,058 contacts →
	Exact match “Enova is the regional leader in integrated energy and multi-technical services, delivering comprehensive services to its clients.” 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	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
6	GK	Exact match	Oslo, NorwayHQ recorded Oct 1, 2026	1,001-5,000	1,150 contacts →
	Exact match “GK er en ledende teknisk entreprenør og servicepartner.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	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
8	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
9	Syska Hennessy Group	Exact match	New York, United StatesHQ recorded Oct 1, 2026	501-1,000	803 contacts →
	Exact match “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	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
11	3e Engenharia EM Eficiencia Energetica	Exact match	BrazilHQ recorded Oct 1, 2026	201-500	473 contacts →
	Exact match “A 3E Engenharia atua nacionalmente, oferecendo soluções para empresas concessionárias de serviços públicos, no planejamento, gestão, execução e inovação em projetos de Eficiência…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Korra Energi	Exact match	Cairo, EgyptHQ recorded Oct 1, 2026	1,001-5,000	469 contacts →
	Exact match “Korra Energi is a proud Egyptian leader in energy efficiency and construction services, backed by over 25 years of expertise and a vision of "Growth and Prosperity"(إعمار الأرض).” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	Veolia Industries Global Solutions	Exact match	Aubervilliers, FranceHQ recorded Oct 1, 2026	1,001-5,000	460 contacts →
	Exact match “Veolia Industries Global Solutions est devenu Veolia Energie Performance depuis le 1er juin 2025.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Sitelogiq	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 1, 2026	501-1,000	450 contacts →
	Exact match “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Greenflex	Exact match	Paris, FranceHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
16	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
17	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
18	MCW Group Of Companies	Exact match	Toronto, ON, CanadaHQ recorded Oct 1, 2026	201-500	363 contacts →
	Exact match “Since 1964 the MCW Group has built a solid reputation for the delivery of Professional Consulting Engineering Services, Energy Management Services, and Engineering Development…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Wendel Companies	Exact match	Williamsville, NY, United StatesHQ recorded Oct 1, 2026	201-500	355 contacts →
	Exact match “Wendel is an Architecture, Engineering, Energy Efficiency, and Construction Management Firm that delivers customized solutions and turnkey projects in innovative ways.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	AESA	Exact match	Barcelona, SpainHQ recorded Oct 1, 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 · Oct 1, 2026 · View company records in RevenueBase
21	ترشيد Tarshid	Exact match	Riyadh, Saudi ArabiaHQ recorded Oct 1, 2026	201-500	342 contacts →
	Exact match “The National Energy Services Company (TARSHID) is a national company wholly owned by the Public Investment Fund (PIF).” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Oct 1, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	Atelier TEN	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	323 contacts →
	Exact match “As environmental design consultants, building services engineers and lighting designers, we are committed to high performance and sustainable design within the built environment.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	ETP CC	Exact match	AustraliaHQ recorded Oct 1, 2026	n/a	320 contacts →
	Exact match “Management Consulting in the Energy Sector” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	EIC Partnership	Exact match	Redditch, United KingdomHQ recorded Oct 1, 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 · 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 “energy efficiency 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 13,798 energy efficiency consulting firms worldwide

See the full list, filter by size, metro and specialty, and access 45,064 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Energy efficiency consulting firms worldwide at a glance

As of Oct 1, 2026

32.3%Verified-email coverage

10.1Average contacts per company

1-10Median size (employees)

1.2%Largest-city concentration · Paris

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

9,110

11-50

3,661

51-200

739

201-500

127

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 energy efficiency consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “energy efficiency 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 45,064 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.

Energy efficiency consulting firms by location

69 lists · largest first

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

How many energy efficiency consulting firms are there worldwide?

RevenueBase identified 13,798 company matches for energy efficiency 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?

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

Which country has the most energy efficiency consulting firms?

The United States leads with 2,339 companies, followed by France (1,218) and Spain (924). Every energy efficiency consulting firms list by country and city is linked on this page.

Which city has the most energy efficiency consulting firms?

Paris leads with 169 company records, followed by Madrid (164) and London (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 45,064 professional contacts with verified work emails tracked across these 13,798 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.