Company lists · Data refreshed October 2026

Top 25 Energy efficiency firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 10,813 companies tracked

RevenueBase identified 10,813 company matches for energy efficiency firms worldwide as of October 2026 and tracks 129,848 professional contacts across them, including 40,874 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for energy efficiency 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 12, 2026. Country and city lists for energy efficiency 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 12, 2026 How this list was built

10,813Companies

129,848Contacts tracked

40,874Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest energy efficiency firms worldwide

Ranked by team size

Top 25 of 10,813 company matches for energy efficiency firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 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 12, 2026	10001+	9,535 contacts →
	Exact match “Taking care of things.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
2	Equans Belux	Exact match	Brussels, BelgiumHQ recorded Oct 12, 2026	5,001-10,000	5,347 contacts →
	Exact match “What if you could use your talent to contribute to the great challenges of tomorrow?” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
3	Caverion	Exact match	Vantaa, FinlandHQ recorded Oct 12, 2026	10001+	4,548 contacts →
	Exact match “About Caverion Caverion is an expert for smart and sustainable built environments, enabling performance and people’s well-being.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
4	Enova By Veolia	Exact match	Dubai, United Arab EmiratesHQ recorded Oct 12, 2026	5,001-10,000	4,030 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 12, 2026 · View company records in RevenueBase
5	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,206 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 12, 2026 · View company records in RevenueBase
6	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,513 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 12, 2026 · View company records in RevenueBase
7	Ainsworth INC	Exact match	Toronto, ON, CanadaHQ recorded Oct 12, 2026	1,001-5,000	1,390 contacts →
	Exact match “Our customers depend on their buildings, industrial assets, processes, and energy management, to help them meet competitive challenges.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	Bravida Danmark A S	Exact match	Brøndby, DenmarkHQ recorded Oct 12, 2026	1,001-5,000	1,342 contacts →
	Exact match “Bravida Danmark er blandt landets største tekniske installations- og servicevirksomheder med over medarbejdere i byer landet over, og vi er en arbejdsplads, der har plads til alle.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
9	GK	Exact match	Oslo, NorwayHQ recorded Oct 12, 2026	1,001-5,000	1,134 contacts →
	Exact match “GK er en ledende teknisk entreprenør og servicepartner.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Bravida Norge AS	Exact match	Oslo, NorwayHQ recorded Oct 12, 2026	1,001-5,000	898 contacts →
	Exact match “Bravida gir bygninger liv.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	Feenstra	Exact match	Lelystad, NetherlandsHQ recorded Oct 12, 2026	1,001-5,000	789 contacts →
	Exact match “Sinds het ontstaan in 1947 is Feenstra marktleider in installatietechniek met een nationale dekking.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	Linc Facility Services	Exact match	United StatesHQ recorded Oct 12, 2026	1,001-5,000	740 contacts →
	Exact match “The Linc Group is an award-winning provider of integrated facilities management, HVAC and building systems services, lighting and electrical solutions, and other support services…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	Climatec, LLC	Exact match	Phoenix, AZ, United StatesHQ recorded Oct 12, 2026	1,001-5,000	666 contacts →
	Exact match “Climatec has been making buildings safer, more comfortable and efficient for over 40 years.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
14	Albireo Energy	Exact match	Edison, NJ, United StatesHQ recorded Oct 12, 2026	1,001-5,000	658 contacts →
	Exact match “Albireo Energy is a leading independent building controls and energy services provider recognized by customers for creating intelligent, high-performance buildings.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Airmaster	Exact match	Scoresby, AustraliaHQ recorded Oct 12, 2026	1,001-5,000	507 contacts →
	Exact match “At Airmaster, our goal is to lead the way in integrated building services, combining HVAC & R, building automation, electrical, and fire systems to create smart buildings that are…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
16	Noresco	Exact match	Westborough, MA, United StatesHQ recorded Oct 12, 2026	201-500	479 contacts →
	Exact match “NORESCO, an OPTERRA company, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
17	Korra Energi	Exact match	Cairo, EgyptHQ recorded Oct 12, 2026	1,001-5,000	476 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 12, 2026 · View company records in RevenueBase
18	Veolia Industries Global Solutions	Exact match	Aubervilliers, FranceHQ recorded Oct 12, 2026	1,001-5,000	429 contacts →
	Exact match “Veolia Industries Global Solutions est devenu Veolia Energie Performance depuis le 1er juin 2025.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
19	UMC	Exact match	Lynnwood, WA, United StatesHQ recorded Oct 12, 2026	201-500	420 contacts →
	Exact match “UMC helps clients solve the complex challenges of built environments and their systems.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
20	Budderfly	Exact match	Shelton, CT, United StatesHQ recorded Oct 12, 2026	201-500	380 contacts →
	Exact match “Budderfly is redefining how energy efficiency, resilience, and grid participation can work together across America’s commercial sector.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	MCW Group Of Companies	Exact match	Toronto, ON, CanadaHQ recorded Oct 12, 2026	201-500	370 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 12, 2026 · View company records in RevenueBase
22	AIR Systems, INC	Exact match	San Jose, CA, United StatesHQ recorded Oct 12, 2026	201-500	359 contacts →
	Exact match “Whether building quality work environments, valuable relationships or community ties, Air Systems never cuts corners.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
23	ترشيد Tarshid	Exact match	Riyadh, Saudi ArabiaHQ recorded Oct 12, 2026	201-500	355 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 12, 2026 · View company records in RevenueBase
24	Entes Elektronik	Exact match	Istanbul, TürkiyeHQ recorded Oct 12, 2026	201-500	334 contacts →
	Exact match “A World Brand/Pride of Turkey In Energy Quality ENTES is a family that works ardently for energy quality and efficiency in our country, where energy is valuable and overcosting.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
25	Boland	Exact match	Gaithersburg, MD, United StatesHQ recorded Oct 12, 2026	201-500	329 contacts →
	Exact match “Boland is the leading commercial HVAC systems, services, and building energy solutions provider in the DC metro area.” Recorded in the RevenueBase company graph · Oct 12, 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 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 10,813 energy efficiency firms worldwide

See the full list, filter by size, metro and specialty, and access 40,874 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Energy efficiency firms worldwide at a glance

As of Oct 12, 2026

31.5%Verified-email coverage

12.0Average contacts per company

1-10Median size (employees)

1.2%Largest-city concentration · Sao Paulo

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

6,191

11-50

3,394

51-200

892

201-500

174

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 firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “energy efficiency 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 40,874 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 12, 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 firms by location

48 lists · largest first

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

How many energy efficiency firms are there worldwide?

RevenueBase identified 10,813 company matches for energy efficiency 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 firms?

The United States leads with 1,972 companies, followed by France (835) and Spain (774). Every energy efficiency firms list by country and city is linked on this page.

Which city has the most energy efficiency firms?

Sao Paulo leads with 130 company records, followed by Madrid (123) and Paris (101).

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 40,874 professional contacts with verified work emails tracked across these 10,813 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 12, 2026.

Ready to reach these companies? Verified emails and direct dials for all 10,813 energy efficiency firms worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.