Company lists · Data refreshed September 2026

Top 25 Industrial energy efficiency firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 9,074 companies tracked

RevenueBase identified 9,074 industrial energy efficiency firms worldwide as of September 2026 and tracks 109,718 professional contacts across them, including 34,837 with verified work emails and 0 with mobile numbers. The United States is the largest market and Madrid the largest hub.

This list covers industrial energy efficiency firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026. Country and city lists for industrial energy efficiency firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

9,074Companies

109,718Contacts tracked

34,837Verified emails

0Mobile numbers

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The 25 largest industrial energy efficiency firms worldwide

Ranked by team size

Top 25 of 9,074 industrial energy efficiency firms worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to industrial energy efficiency firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	British GAS	Indirect evidence	Windsor, United KingdomHQ checked Sep 17, 2026	10001+	9,238 contacts →
	Indirect evidence “Taking care of things.” Source: RevenueBase Database · checked Sep 17, 2026
2	Clearesult	Strong evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,121 contacts →
	Strong evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Sep 17, 2026
3	Ameresco	Partial evidence	Framingham, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,383 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
4	GK	Indirect evidence	Oslo, NorwayHQ checked Sep 17, 2026	1,001-5,000	1,150 contacts →
	Indirect evidence “GK er en ledende teknisk entreprenør og servicepartner.” Source: RevenueBase Database · checked Sep 17, 2026
5	Danfoss Climate Solutions	Strong evidence	Nordborg, DenmarkHQ checked Sep 17, 2026	10001+	1,128 contacts →
	Strong evidence “At Danfoss Climate Solutions, we engineer energy-efficient heating and cooling solutions to help the world get more out of less.” Source: RevenueBase Database · checked Sep 17, 2026
6	Techem Energy Services Gmbh	Partial evidence	Eschborn, GermanyHQ checked Sep 17, 2026	1,001-5,000	1,021 contacts →
	Partial evidence “Techem is a leading global energy service provider for the real estate sector and private homeowners.” Source: RevenueBase Database · checked Sep 17, 2026
7	Willdan	Indirect evidence	Anaheim, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	851 contacts →
	Indirect evidence “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Source: RevenueBase Database · checked Sep 17, 2026
8	Resource Innovations	Partial evidence	Half Moon Bay, CA, United StatesHQ checked Sep 17, 2026	501-1,000	733 contacts →
	Partial evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 17, 2026
9	Sigma Industry	Indirect evidence	Stockholm, SwedenHQ checked Sep 17, 2026	1,001-5,000	688 contacts →
	Indirect evidence “Sigma Industry har tagit ett långsiktigt åtagande för att förnya konsultbranschen inom ingenjörstjänster.” Source: RevenueBase Database · checked Sep 17, 2026
10	Inerco	Partial evidence	Sevilla, SpainHQ checked Sep 17, 2026	1,001-5,000	688 contacts →
	Partial evidence “INERCO, with 30 years of experience, offers comprehensive services and develops advanced technologies that contribute to sustainable industrial development, acting as a leader in…” Source: RevenueBase Database · checked Sep 17, 2026
11	Noresco	Partial evidence	Westborough, MA, United StatesHQ checked Sep 17, 2026	201-500	481 contacts →
	Partial evidence “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Source: RevenueBase Database · checked Sep 17, 2026
12	Veolia Industries Global Solutions	Strong evidence	Aubervilliers, FranceHQ checked Sep 17, 2026	1,001-5,000	460 contacts →
	Strong evidence “Veolia Industries Global Solutions est devenu Veolia Energie Performance depuis le 1er juin 2025.” Source: RevenueBase Database · checked Sep 17, 2026
13	Elmeasure	Strong evidence	Bangalore, IndiaHQ checked Sep 17, 2026	501-1,000	446 contacts →
	Strong evidence “Founded in 2004 by a passionate team of entrepreneurs with deep expertise in energy management, Elmeasure began with a bold mission: to help industries, businesses, and…” Source: RevenueBase Database · checked Sep 17, 2026
14	Actemium Belgium	Strong evidence	Aalter, BelgiumHQ checked Sep 17, 2026	501-1,000	400 contacts →
	Strong evidence “Actemium Belgium, the VINCI Energies brand focused on the industry, has developed an established reputation in the advice, study, realization and support for industrial processes…” Source: RevenueBase Database · checked Sep 17, 2026
15	Greenflex	Partial evidence	Paris, FranceHQ checked Sep 17, 2026	501-1,000	390 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
16	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 17, 2026	201-500	375 contacts →
	Indirect evidence “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: RevenueBase Database · checked Sep 17, 2026
17	Budderfly	Strong evidence	Shelton, CT, United StatesHQ checked Sep 17, 2026	201-500	366 contacts →
	Strong evidence “Budderfly is redefining how energy efficiency, resilience, and grid participation can work together across America’s commercial sector.” Source: RevenueBase Database · checked Sep 17, 2026
18	MCW Group Of Companies	Partial evidence	Toronto, ON, CanadaHQ checked Sep 17, 2026	201-500	363 contacts →
	Partial evidence “Since 1964 the MCW Group has built a solid reputation for the delivery of Professional Consulting Engineering Services, Energy Management Services, and Engineering Development…” Source: RevenueBase Database · checked Sep 17, 2026
19	AESA	Partial evidence	Barcelona, SpainHQ checked Sep 17, 2026	n/a	351 contacts →
	Partial evidence “Ingeniería y Consultoría Energética orientada a la búsqueda y el desarrollo de soluciones energéticas de alta eficiencia para sus Clientes.” Source: RevenueBase Database · checked Sep 17, 2026
20	ترشيد Tarshid	Partial evidence	Riyadh, Saudi ArabiaHQ checked Sep 17, 2026	201-500	342 contacts →
	Partial evidence “The National Energy Services Company (TARSHID) is a national company wholly owned by the Public Investment Fund (PIF).” Source: RevenueBase Database · checked Sep 17, 2026
21	NUS Consulting Group	Indirect evidence	Park Ridge, NJ, United StatesHQ checked Sep 17, 2026	201-500	336 contacts →
	Indirect evidence “National Utility Service, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
22	Energy Pool	Strong evidence	Le Bourget Du Lac, FranceHQ checked Sep 17, 2026	51-200	300 contacts →
	Strong evidence “At the centre of the smart grid revolution, Energy Pool manages and optimizes complex systems (energy consumption of industrial sites, decentralized production, renewable…” Source: RevenueBase Database · checked Sep 17, 2026
23	Hellio	Indirect evidence	Clichy, FranceHQ checked Sep 17, 2026	201-500	293 contacts →
	Indirect evidence “Engagé depuis 2008, Hellio est le pionnier du marché des économies d’énergie en France (métropole et Outre-Mer).” Source: RevenueBase Database · checked Sep 17, 2026
24	Entes Elektronik	Strong evidence	Istanbul, TürkiyeHQ checked Sep 17, 2026	201-500	289 contacts →
	Strong evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
25	Cascade Energy	Partial evidence	Portland, OR, United StatesHQ checked Sep 17, 2026	201-500	288 contacts →
	Partial evidence “At Cascade Energy, we believe in better.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: industrial energy efficiency firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names industrial energy efficiency firms.
Partial evidence: Its own public description names part of industrial energy efficiency firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial energy efficiency firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 9,074 industrial energy efficiency firms worldwide

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Industrial energy efficiency firms worldwide at a glance

As of Sep 17, 2026

31.8%Verified-email coverage

12.1Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · Madrid

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

5,373

11-50

2,783

51-200

673

201-500

124

501-1,000

1,001-5,000

5,001-10,000

10001+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among industrial energy efficiency firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: 32 countries, largest first: the United States, Spain, France, Italy, Germany, Brazil, the United Kingdom, Canada, India, Australia and 22 more. Country and city lists for industrial energy efficiency firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “industrial energy efficiency firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names industrial energy efficiency firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among industrial energy efficiency firms, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 34,837 across the full list. 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 September 17, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Industrial energy efficiency firms by location

43 lists · largest first

Every Industrial 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 Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names industrial energy efficiency firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many industrial energy efficiency firms are there worldwide?

RevenueBase identified 9,074 industrial energy efficiency firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

British GAS, headquartered in Windsor, tops this list with the largest team on record.

Which country has the most industrial energy efficiency firms?

The United States leads with 1,766 companies, followed by Spain (839) and France (778). Every industrial energy efficiency firms list by country and city is linked on this page.

Which city has the most industrial energy efficiency firms?

Madrid leads with 136 headquartered companies, followed by Paris (124) and London (89).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 34,837 verified decision-maker contacts tracked across these 9,074 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 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 Smart Search, 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.