Company lists · Data refreshed November 2026

Top 25 Energy efficiency engineering companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 13,088 companies tracked

RevenueBase identified 13,088 company matches for energy efficiency engineering companies worldwide as of November 2026 and tracks 161,726 professional contacts across them, including 55,503 with verified work emails. The United States is the largest market and Madrid the largest hub.

This list covers company matches for energy efficiency engineering 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 November 6, 2026. Country and city lists for energy efficiency engineering 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 Nov 6, 2026 How this list was built

13,088Companies

161,726Contacts tracked

55,503Verified emails

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

The 25 largest energy efficiency engineering companies worldwide

Ranked by team size

Top 25 of 13,088 company matches for energy efficiency engineering companies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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 Nov 6, 2026	10001+	9,964 contacts →
	Exact match “Taking care of things.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Nov 6, 2026	10001+	9,075 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Equans Belux	Exact match	Brussels, BelgiumHQ recorded Nov 6, 2026	5,001-10,000	5,429 contacts →
	Exact match “What if you could use your talent to contribute to the great challenges of tomorrow?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Enova By Veolia	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	5,001-10,000	4,188 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 · Nov 6, 2026 · View company records in RevenueBase
5	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,264 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 · Nov 6, 2026 · View company records in RevenueBase
6	IMEG	Exact match	Rock Island, IL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,116 contacts →
	Exact match “Leaders in Engineering and Innovation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,570 contacts →
	Exact match “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure company delivering integrated solutions to create reliable power and modernize infrastructure.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Danfoss Climate Solutions	Exact match	Nordborg, DenmarkHQ recorded Nov 6, 2026	10001+	1,279 contacts →
	Exact match “At Danfoss Climate Solutions, we engineer energy-efficient heating and cooling solutions to help the world get more out of less.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	GK	Exact match	Oslo, NorwayHQ recorded Nov 6, 2026	1,001-5,000	1,190 contacts →
	Exact match “GK er en ledende teknisk entreprenør og servicepartner.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Dalkia UK	Exact match	London, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	1,127 contacts →
	Exact match “Together, we’re delivering technical solutions for a better society and an Electric Britain Dalkia is one of the UK’s leading technical and energy services providers at the…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Affiliated Engineers, INC	Exact match	Madison, IL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,099 contacts →
	Exact match “Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Clarke Energy	Exact match	Liverpool, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	1,048 contacts →
	Exact match “Clarke Energy, a Rehlko company, specialises in energy efficient, low carbon and flexible energy systems.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	897 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 · Nov 6, 2026 · View company records in RevenueBase
14	Syska Hennessy Group	Exact match	Raleigh, NC, United StatesHQ recorded Nov 6, 2026	501-1,000	857 contacts →
	Exact match “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	PAE	Exact match	Portland, NV, United StatesHQ recorded Nov 6, 2026	201-500	843 contacts →
	Exact match “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Albireo Energy	Exact match	Edison, NJ, United StatesHQ recorded Nov 6, 2026	1,001-5,000	672 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 · Nov 6, 2026 · View company records in RevenueBase
17	Harris PYE	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	501-1,000	598 contacts →
	Exact match “At Harris Pye, everything we do saves energy.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Amstein Walthert	Exact match	Zurich, SwitzerlandHQ recorded Nov 6, 2026	1,001-5,000	571 contacts →
	Exact match “Ü Ingenieurskunst bedeutet, mit Ressourcen richtig umzugehen.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	3e Engenharia EM Eficiencia Energetica	Exact match	BrazilHQ recorded Nov 6, 2026	201-500	558 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 · Nov 6, 2026 · View company records in RevenueBase
20	Groupe Acceo BET Energie, Ascenseur, Environnement, AMO & MOE Spécialisées	Exact match	La Ciotat, FranceHQ recorded Nov 6, 2026	501-1,000	520 contacts →
	Exact match “ACCEO est un bureau d’études en bâtiment indépendant fondé en 2003 et spécialisé dans des domaines à forte technicité : Ascenseurs, Efficacité énergétique, Environnement, AMO et…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Korra Energi	Exact match	Cairo, EgyptHQ recorded Nov 6, 2026	1,001-5,000	517 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 · Nov 6, 2026 · View company records in RevenueBase
22	Sitelogiq	Exact match	Minneapolis, MN, United StatesHQ recorded Nov 6, 2026	501-1,000	503 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 · Nov 6, 2026 · View company records in RevenueBase
23	Noresco	Exact match	Westborough, NJ, United StatesHQ recorded Nov 6, 2026	201-500	496 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 · Nov 6, 2026 · View company records in RevenueBase
24	H.H. Angus & Associates LTD	Exact match	Toronto, QC, CanadaHQ recorded Nov 6, 2026	201-500	435 contacts →
	Exact match “HH Angus Corporate Overview HH Angus and Associates Limited was founded in 1919 and today is one of Canada’s larger private engineering firms.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Veolia Industries Global Solutions	Exact match	Aubervilliers, FranceHQ recorded Nov 6, 2026	1,001-5,000	435 contacts →
	Exact match “Veolia Industries Global Solutions est devenu Veolia Energie Performance depuis le 1er juin 2025.” Recorded in the RevenueBase company graph · Nov 6, 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 engineering 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 13,088 energy efficiency engineering companies worldwide

See the full list, filter by size, metro and specialty, and access 55,503 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Energy efficiency engineering companies worldwide at a glance

As of Nov 6, 2026

34.3%Verified-email coverage

12.4Average contacts per company

1-10Median size (employees)

1.0%Largest-city concentration · Madrid

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

7,830

11-50

3,963

51-200

863

201-500

163

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 engineering companies are linked below.
What qualifies: Company records worldwide whose business descriptions match “energy efficiency engineering 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 55,503 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 November 6, 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 engineering companies by location

58 lists · largest first

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

How many energy efficiency engineering companies are there worldwide?

RevenueBase identified 13,088 company matches for energy efficiency engineering companies worldwide as of November 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 engineering companies?

The United States leads with 1,760 companies, followed by France (1,074) and Italy (960). Every energy efficiency engineering companies list by country and city is linked on this page.

Which city has the most energy efficiency engineering companies?

Madrid leads with 136 company records, followed by Paris (127) and London (102).

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 55,503 professional contacts with verified work emails tracked across these 13,088 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 November 6, 2026.

Ready to reach these companies? Verified emails and direct dials for all 13,088 energy efficiency engineering companies 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.