Company lists · Data refreshed September 2026

Top 25 Energy systems integration firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 26,672 companies tracked

RevenueBase identified 26,672 energy systems integration firms worldwide as of September 2026 and tracks 431,617 professional contacts across them, including 130,906 with verified work emails. The United States is the largest market and London the largest hub.

This list covers energy systems integration 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 28, 2026. Country and city lists for energy systems integration 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 28, 2026 86% judged on-target in blind review

26,672Companies

431,617Contacts tracked

130,906Verified emails

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The 25 largest energy systems integration firms worldwide

Ranked by team size

Top 25 of 26,672 energy systems integration firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to energy systems integration 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	Johnson Controls	Strong evidence	Cork, IrelandHQ checked Sep 28, 2026	10001+	52,736 contacts →
	Strong evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 28, 2026
2	Atkinsréalis	Indirect evidence	Montreal, QC, CanadaHQ checked Sep 28, 2026	10001+	22,733 contacts →
	Indirect evidence “We are a world-class engineering services and nuclear organization.” Source: RevenueBase Database · checked Sep 28, 2026
3	Atkins	Indirect evidence	Epsom, United KingdomHQ checked Sep 28, 2026	10001+	9,297 contacts →
	Indirect evidence “Atkins is now AtkinsRéalis.” Source: RevenueBase Database · checked Sep 28, 2026
4	KENT	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 28, 2026	10001+	7,045 contacts →
	Indirect evidence “We design, build and maintain the assets that power the world for today and make it future-ready for tomorrow.” Source: RevenueBase Database · checked Sep 28, 2026
5	Sargent & Lundy	Indirect evidence	Chicago, WY, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,156 contacts →
	Indirect evidence “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: RevenueBase Database · checked Sep 28, 2026
6	Enova By Veolia	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 28, 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 28, 2026
7	M.C. Dean, INC	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 28, 2026	5,001-10,000	2,761 contacts →
	Indirect evidence “M.C.” Source: RevenueBase Database · checked Sep 28, 2026
8	ATS Corporation	Indirect evidence	Cambridge, ON, CanadaHQ checked Sep 28, 2026	5,001-10,000	2,754 contacts →
	Indirect evidence “HELPING ADVANCE THE FUTURE ATS Corporation is an industry-leading automation solutions provider to many of the world's most successful companies.” Source: RevenueBase Database · checked Sep 28, 2026
9	FTI	Partial evidence	Menasha, WI, United StatesHQ checked Sep 28, 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 28, 2026
10	Tata Power Renewable Energy Limited	Partial evidence	Mumbai, IndiaHQ checked Sep 28, 2026	501-1,000	2,660 contacts →
	Partial evidence “Tata Power Renewable Energy Limited (TPREL) is one of India’s leading renewable energy companies, driving the transition towards a cleaner, more resilient and sustainable energy…” Source: RevenueBase Database · checked Sep 28, 2026
11	Croonwolter&dros	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 28, 2026	1,001-5,000	2,515 contacts →
	Indirect evidence “For more than 140 years Croonwolter & dros has been in the vanguard of new developments.” Source: RevenueBase Database · checked Sep 28, 2026
12	Innio Group	Partial evidence	Munich, GermanyHQ checked Sep 28, 2026	1,001-5,000	2,111 contacts →
	Partial evidence “INNIO Group is a global distributed energy solutions provider that delivers reliable, flexible, transient, decentralized, modular and efficient power.” Source: RevenueBase Database · checked Sep 28, 2026
13	Omexom	Partial evidence	Nanterre, FranceHQ checked Sep 28, 2026	5,001-10,000	1,903 contacts →
	Partial evidence “With today's global energy sector undergoing constant change, Omexom works with its clients in delivering on the promises of the energy transition.” Source: RevenueBase Database · checked Sep 28, 2026
14	Enercon Services, INC	Partial evidence	Kennesaw, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,865 contacts →
	Partial evidence “ENERCON is a multi-discipline engineering and environmental engineering support services firm focused on delivering safe and efficient solutions for the power, data center and…” Source: RevenueBase Database · checked Sep 28, 2026
15	Fluence	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
16	Mitsubishi Power Americas	Indirect evidence	Lake Mary, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,859 contacts →
	Indirect evidence “Mitsubishi Power Americas is creating a future that works for people and the planet through innovative power generation technology and solutions.” Source: RevenueBase Database · checked Sep 28, 2026
17	Elsewedy Electric Power Systems Projects	Partial evidence	Cairo, EgyptHQ checked Sep 28, 2026	1,001-5,000	1,396 contacts →
	Partial evidence “An integrated energy solutions -design and build- provider specialized in Power Generation, Water Treatment and Hydropower while currently diversifying our business segments to…” Source: RevenueBase Database · checked Sep 28, 2026
18	Ameresco	Partial evidence	Framingham, MA, United StatesHQ checked Sep 28, 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 28, 2026
19	Solv Energy	Partial evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,286 contacts →
	Partial evidence “SOLV Energy is a renewable energy solutions provider for utility solar, energy storage, and high voltage projects in North America.” Source: RevenueBase Database · checked Sep 28, 2026
20	Site SPA	Strong evidence	Bologna, ItalyHQ checked Sep 28, 2026	1,001-5,000	1,221 contacts →
	Strong evidence “SITE fornisce servizi di System Integration, nella realizzazione di infrastrutture e impianti tecnologici.” Source: RevenueBase Database · checked Sep 28, 2026
21	Dalkia UK	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
22	Clarke Energy	Strong evidence	Liverpool, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,049 contacts →
	Strong evidence “Clarke Energy, a Rehlko company, specialises in energy efficient, low carbon and flexible energy systems.” Source: RevenueBase Database · checked Sep 28, 2026
23	Ormazabal	Indirect evidence	Derio, SpainHQ checked Sep 28, 2026	1,001-5,000	1,014 contacts →
	Indirect evidence “We are experts in customized and high-tech electrical solutions for your challenges At Ormazabal we design and manufacture solutions aimed at digitalizing the electrical grid to…” Source: RevenueBase Database · checked Sep 28, 2026
24	Wärtsilä Energy	Partial evidence	Helsinki, FinlandHQ checked Sep 28, 2026	10001+	940 contacts →
	Partial evidence “Wärtsilä leads the transition towards a 100% renewable energy future.” Source: RevenueBase Database · checked Sep 28, 2026
25	Prime Controls	Indirect evidence	Lewisville, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	857 contacts →
	Indirect evidence “Prime Controls was established as a Main Automation Contractor to provide customers a sole source solution for Industrial Automation services and products.” Source: RevenueBase Database · checked Sep 28, 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 systems integration 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 energy systems integration firms.
Partial evidence: Its own public description names part of energy systems integration firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy systems integration 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 26,672 energy systems integration firms worldwide

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Energy systems integration firms worldwide at a glance

As of Sep 28, 2026

30.3%Verified-email coverage

16.2Average contacts per company

1-10Median size (employees)

0.6%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

13,333

11-50

9,515

51-200

2,686

201-500

580

501-1,000

174

1,001-5,000

141

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 systems integration 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: Every country. Country and city lists for energy systems integration firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “energy systems integration 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 energy systems integration 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 energy systems integration 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, 130,906 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 28, 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 systems integration firms by location

108 lists · largest first

Every Energy systems integration 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 energy systems integration 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 energy systems integration firms are there worldwide?

RevenueBase identified 26,672 energy systems integration 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?

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

Which country has the most energy systems integration firms?

The United States leads with 4,517 companies, followed by Italy (1,790) and Germany (1,632). Every energy systems integration firms list by country and city is linked on this page.

Which city has the most energy systems integration firms?

London leads with 165 headquartered companies, followed by Sao Paulo (150) and Madrid (117).

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 130,906 verified decision-maker contacts tracked across these 26,672 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 28, 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.