Company lists · Data refreshed September 2026

Top 25 Energy as a service companies worldwide

Name: Energy as a service companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 17,276 companies tracked

RevenueBase identified 17,276 energy as a service companies worldwide as of September 2026 and tracks 366,645 professional contacts across them, including 108,893 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers energy as a service companies 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 15, 2026. Country and city lists for energy as a service companies 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 15, 2026 86% judged on-target in blind review

17,276Companies

366,645Contacts tracked

108,893Verified emails

0Mobile numbers

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The 25 largest energy as a service companies worldwide

Ranked by team size

Top 25 of 17,276 energy as a service companies worldwide, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to energy as a service companies: 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	Johnson Controls	Partial evidence	Cork, IrelandHQ checked Sep 15, 2026	10001+	52,736 contacts →
	Partial evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 15, 2026
2	British GAS	Indirect evidence	Windsor, United KingdomHQ checked Sep 15, 2026	10001+	9,238 contacts →
	Indirect evidence “Taking care of things.” Source: RevenueBase Database · checked Sep 15, 2026
3	DTE Energy	Partial evidence	Detroit, MI, United StatesHQ checked Sep 15, 2026	10001+	9,087 contacts →
	Partial evidence “DTE is one of the largest Fortune 500 diversified energy companies, proudly serving Michigan for over a century.” Source: RevenueBase Database · checked Sep 15, 2026
4	Dalkia	Indirect evidence	Saint-andré-lez-lille, FranceHQ checked Sep 15, 2026	10001+	8,427 contacts →
	Indirect evidence “Dalkia : ensemble, relevons le défi climatique!” Source: RevenueBase Database · checked Sep 15, 2026
5	REXEL	Partial evidence	Paris, FranceHQ checked Sep 15, 2026	10001+	6,399 contacts →
	Partial evidence “Rexel, worldwide expert in the multichannel professional distribution of products and services for the energy world, addresses three main markets: residential, commercial, and…” Source: RevenueBase Database · checked Sep 15, 2026
6	The AES Corporation	Strong evidence	Arlington, VA, United StatesHQ checked Sep 15, 2026	5,001-10,000	5,387 contacts →
	Strong evidence “The world no longer thinks of energy as a matter of supply and demand.” Source: RevenueBase Database · checked Sep 15, 2026
7	Centrica	Partial evidence	Windsor, United KingdomHQ checked Sep 15, 2026	10001+	4,555 contacts →
	Partial evidence “Centrica is an international energy services and solutions company, founded on a 200-year heritage of serving customers in homes and businesses.” Source: RevenueBase Database · checked Sep 15, 2026
8	Ambit Energy	Partial evidence	Irving, TX, United StatesHQ checked Sep 15, 2026	n/a	4,150 contacts →
	Partial evidence “Ambit Energy provides electricity, natural gas and solar services in numerous markets across the United States, primarily marketed through a direct sales channel of more than…” Source: RevenueBase Database · checked Sep 15, 2026
9	Enova By Veolia	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 15, 2026	5,001-10,000	4,058 contacts →
	Partial evidence “Enova is the regional leader in integrated energy and multi-technical services, delivering comprehensive services to its clients.” Source: RevenueBase Database · checked Sep 15, 2026
10	Octopus Energy	Partial evidence	London, United KingdomHQ checked Sep 15, 2026	1,001-5,000	3,989 contacts →
	Partial evidence “We're on a mission to make a big green dent in the universe by building a truly sustainable energy system globally.” Source: RevenueBase Database · checked Sep 15, 2026
11	Generac	Partial evidence	Waukesha, WI, United StatesHQ checked Sep 15, 2026	5,001-10,000	3,797 contacts →
	Partial evidence “Generac is the total energy solutions company powering a smarter world.” Source: RevenueBase Database · checked Sep 15, 2026
12	ENPAL	Partial evidence	Berlin, GermanyHQ checked Sep 15, 2026	5,001-10,000	3,242 contacts →
	Partial evidence “Enpal is Europe's leading new energy company.” Source: RevenueBase Database · checked Sep 15, 2026
13	FTI	Partial evidence	Menasha, WI, United StatesHQ checked Sep 15, 2026	1,001-5,000	2,741 contacts →
	Partial evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 15, 2026
14	Shell Energy	Partial evidence	London, United KingdomHQ checked Sep 15, 2026	1,001-5,000	2,627 contacts →
	Partial evidence “We help businesses manage energy needs, boost efficiency, control costs and achieve decarbonisation goals for a better energy future.” Source: RevenueBase Database · checked Sep 15, 2026
15	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 15, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 15, 2026
16	Clearesult	Partial evidence	Austin, TX, United StatesHQ checked Sep 15, 2026	1,001-5,000	2,121 contacts →
	Partial evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Sep 15, 2026
17	Fluence	Partial evidence	Arlington, VA, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,863 contacts →
	Partial evidence “To achieve our mission, we design, deploy, and operate the world’s most advanced modular energy storage products, comprehensive lifecycle services, and AI-enabled asset management…” Source: RevenueBase Database · checked Sep 15, 2026
18	Rehlko	Partial evidence	Milwaukee, WI, United StatesHQ checked Sep 15, 2026	5,001-10,000	1,709 contacts →
	Partial evidence “Rehlko is a global leader in energy resilience, delivering the solutions critical to sustain and improve life.” Source: RevenueBase Database · checked Sep 15, 2026
19	Just Energy	Partial evidence	Houston, TX, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,645 contacts →
	Partial evidence “Established in 1997, Just Energy has been a leading retail energy provider serving markets across the United States and Canada.” Source: RevenueBase Database · checked Sep 15, 2026
20	Celsia Energía	Partial evidence	Medellín, ColombiaHQ checked Sep 15, 2026	1,001-5,000	1,547 contacts →
	Partial evidence “Somos la empresa de energía del Grupo Argos que gestiona infraestructura y activos que permiten a nuestros clientes ser más eficientes y competitivos en su consumo de energía.” Source: RevenueBase Database · checked Sep 15, 2026
21	IGS Energy	Partial evidence	Dublin, OH, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,388 contacts →
	Partial evidence “IGS Energy has been a trusted energy advisor since 1989, growing into one of the nation’s top energy retailers.” Source: RevenueBase Database · checked Sep 15, 2026
22	Ameresco	Partial evidence	Framingham, MA, United StatesHQ checked Sep 15, 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 15, 2026
23	GK	Indirect evidence	Oslo, NorwayHQ checked Sep 15, 2026	1,001-5,000	1,150 contacts →
	Indirect evidence “GK er en ledende teknisk entreprenør og servicepartner.” Source: RevenueBase Database · checked Sep 15, 2026
24	BKW AG	Partial evidence	Bern, SwitzerlandHQ checked Sep 15, 2026	10001+	1,148 contacts →
	Partial evidence “The BKW Group is an internationally active energy and infrastructure company based in Berne.” Source: RevenueBase Database · checked Sep 15, 2026
25	Dalkia UK	Partial evidence	London, United KingdomHQ checked Sep 15, 2026	5,001-10,000	1,064 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 15, 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: energy as a service companies. 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 energy as a service companies.
Partial evidence: Its own public description names part of energy as a service companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy as a service companies. 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 17,276 energy as a service companies worldwide

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Energy as a service companies worldwide at a glance

As of Sep 15, 2026

29.7%Verified-email coverage

21.2Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · London

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

8,808

11-50

6,119

51-200

1,661

201-500

349

501-1,000

103

1,001-5,000

110

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 energy as a service companies, 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: 45 countries, largest first: the United States, Brazil, the United Kingdom, Spain, Italy, Germany, France, India, Australia, the Netherlands and 35 more. Country and city lists for energy as a service companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “energy as a service companies”. 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 energy as a service companies), 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 energy as a service companies, 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, 108,893 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 15, 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.

Energy as a service companies by location

83 lists · largest first

Every Energy as a service 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 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 energy as a service companies, 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 energy as a service companies are there worldwide?

RevenueBase identified 17,276 energy as a service companies 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?

Johnson Controls, headquartered in Milwaukee, tops this list with the largest team on record.

Which country has the most energy as a service companies?

The United States leads with 3,466 companies, followed by Brazil (1,431) and the United Kingdom (1,399). Every energy as a service companies list by country and city is linked on this page.

Which city has the most energy as a service companies?

London leads with 219 headquartered companies, followed by Madrid (206) and Sao Paulo (181).

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 108,893 verified decision-maker contacts tracked across these 17,276 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 15, 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.