Company lists · Data refreshed September 2026

Top 25 Transformer maintenance companies worldwide

Name: Transformer maintenance companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 3,767 companies tracked

RevenueBase identified 3,767 transformer maintenance companies worldwide as of September 2026 and tracks 56,069 professional contacts across them, including 12,076 with verified work emails. India is the largest market and Sao Paulo the largest hub.

This list covers transformer maintenance 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 22, 2026. Country and city lists for transformer maintenance 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 22, 2026 86% judged on-target in blind review

3,767Companies

56,069Contacts tracked

12,076Verified emails

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The 25 largest transformer maintenance companies worldwide

Ranked by team size

Top 25 of 3,767 transformer maintenance companies worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to transformer maintenance 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	Engelmig Energia	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 22, 2026	5,001-10,000	1,818 contacts →
	Indirect evidence “A Engelmig foi fundada em 1985 com o objetivo de prestar serviços de engenharia em redes de distribuição de energia elétrica.” Source: RevenueBase Database · checked Sep 22, 2026
2	Shermco Industries	Partial evidence	Irving, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,221 contacts →
	Partial evidence “Shermco Industries is a provider of safe, reliable testing, repair, professional training, electrical outage planning, maintenance and analysis of rotating apparatus and…” Source: RevenueBase Database · checked Sep 22, 2026
3	Vijai Electricals Limited, Hyderabad	Indirect evidence	Hyderabad, IndiaHQ checked Sep 22, 2026	5,001-10,000	920 contacts →
	Indirect evidence “Vijai Electricals Ltd.” Source: RevenueBase Database · checked Sep 22, 2026
4	Virginia Transformer Corp	Partial evidence	Roanoke, VA, United StatesHQ checked Sep 22, 2026	5,001-10,000	792 contacts →
	Partial evidence “Virginia Transformer is an engineering company that manufactures transformers.” Source: RevenueBase Database · checked Sep 22, 2026
5	AL Ahleia Switchgear Co. Kscc	Indirect evidence	Sabhan, KuwaitHQ checked Sep 22, 2026	1,001-5,000	708 contacts →
	Indirect evidence “Established in 1982 by Sayed Hamid Behbehani & Sons, Kuwait.* First Kuwaiti company to be awarded with ISO 9001 back in 1995 by DNV.* Company certified for ISO/TS 29001:2010…” Source: RevenueBase Database · checked Sep 22, 2026
6	Best Transformer	Partial evidence	Balıkesir, TürkiyeHQ checked Sep 22, 2026	1,001-5,000	696 contacts →
	Partial evidence “BEST Transformer, founded in 1966 in Balıkesir, produces oil-immersed distribution transformers, power transformers, cast resin dry-type transformers, reactors, and mechanical…” Source: RevenueBase Database · checked Sep 22, 2026
7	Electric Power Systems	Indirect evidence	Maryland Heights, MO, United StatesHQ checked Sep 22, 2026	501-1,000	653 contacts →
	Indirect evidence “Electric Power Systems is an independent electrical testing & engineering organization.” Source: RevenueBase Database · checked Sep 22, 2026
8	Data Engenharia	Indirect evidence	Sarzedo, BrazilHQ checked Sep 22, 2026	501-1,000	629 contacts →
	Indirect evidence “The DATA Engenharia is installed in a green area of m2, with m2 of constructed area, in the municipality of Sarzedo (industrial region in the vicinity of Belo Horizonte / MG).” Source: RevenueBase Database · checked Sep 22, 2026
9	Doble Engineering	Indirect evidence	Marlborough, MA, United StatesHQ checked Sep 22, 2026	501-1,000	619 contacts →
	Indirect evidence “Doble is the world’s most trusted brand in electrical diagnostics.” Source: RevenueBase Database · checked Sep 22, 2026
10	Transformers & Rectifiers India LTD	Partial evidence	Ahmedabad, IndiaHQ checked Sep 22, 2026	1,001-5,000	580 contacts →
	Partial evidence “Transformer & Rectifier (India) Limited (TARIL) is one of India’s leading transformer manufacturers, with over four decades of engineering excellence and a strong global presence.” Source: RevenueBase Database · checked Sep 22, 2026
11	Resa Power	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	511 contacts →
	Indirect evidence “RESA Power is your ONE-STOP for all of your power needs.” Source: RevenueBase Database · checked Sep 22, 2026
12	Royal Smit Transformers B.V	Indirect evidence	Nijmegen, NetherlandsHQ checked Sep 22, 2026	501-1,000	447 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
13	Voltamp Transformers Limited	Partial evidence	Vadodara, IndiaHQ checked Sep 22, 2026	501-1,000	444 contacts →
	Partial evidence “Voltamp Transformers Limited is a Oil filled Power, Distribution and Dry type Transformer manufacturing company based in Vadodara, Gujarat State in India since year 1967.The…” Source: RevenueBase Database · checked Sep 22, 2026
14	Concentric Power Services	Partial evidence	Carrollton, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	426 contacts →
	Partial evidence “Concentric is the first national industrial power services organization delivering forklift and critical power as well as maintenance solutions that ensure uninterrupted…” Source: RevenueBase Database · checked Sep 22, 2026
15	ENPAY	Partial evidence	Basiskele, TürkiyeHQ checked Sep 22, 2026	1,001-5,000	424 contacts →
	Partial evidence “ENPAY is the Pace-Setter of Transformer Industry serving to its customers from its 4 Plants Worldwide.” Source: RevenueBase Database · checked Sep 22, 2026
16	Quartzelec Limited	Indirect evidence	Rugby, United KingdomHQ checked Sep 22, 2026	501-1,000	412 contacts →
	Indirect evidence “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Source: RevenueBase Database · checked Sep 22, 2026
17	Ingener	Indirect evidence	Montevideo, UruguayHQ checked Sep 22, 2026	501-1,000	394 contacts →
	Indirect evidence “Empresa de Ingeniería y Servicios en el area de la Ingenieria Electrica e Industrial.” Source: RevenueBase Database · checked Sep 22, 2026
18	Tereme Engenharia	Indirect evidence	Serra, BrazilHQ checked Sep 22, 2026	501-1,000	391 contacts →
	Indirect evidence “CONTRATOS DE MANUTENÇÃO A Tereme oferece a seus clientes soluções de manutenção global ou parcial dos equipamentos e instalações elétricas de uma planta industrial.” Source: RevenueBase Database · checked Sep 22, 2026
19	UTEC	Partial evidence	Riyadh, Saudi ArabiaHQ checked Sep 22, 2026	1,001-5,000	371 contacts →
	Partial evidence “Since 2001, UTEC has been Saudi Arabia's trusted partner for power transformers, substations, switchgear, and mission-critical electrical solutions.” Source: RevenueBase Database · checked Sep 22, 2026
20	Brush Group	Indirect evidence	Loughborough, United KingdomHQ checked Sep 22, 2026	501-1,000	367 contacts →
	Indirect evidence “We support the global drive to net zero with innovative, engineered solutions that address grid resilience and systems challenges, facilitate electrification of transport and…” Source: RevenueBase Database · checked Sep 22, 2026
21	RHONA	Indirect evidence	Viña Del Mar, ChileHQ checked Sep 22, 2026	501-1,000	352 contacts →
	Indirect evidence “RHONA nace de la unión de dos empresas de ingeniería, cuyos inicios se remontan a 1943.” Source: RevenueBase Database · checked Sep 22, 2026
22	Magnetron Transformers	Partial evidence	Pereira, ColombiaHQ checked Sep 22, 2026	1,001-5,000	350 contacts →
	Partial evidence “Somos una empresa dedicada a producir y comercializar transformadores y equipos para el sector energético mundial, promoviendo el desarrollo de ingeniería nacional, la…” Source: RevenueBase Database · checked Sep 22, 2026
23	Atlanta Electricals Limited	Indirect evidence	Anand, IndiaHQ checked Sep 22, 2026	51-200	342 contacts →
	Indirect evidence “ATLANTA ELECTRICALS is an electrical/electronic manufacturing company based out of India.” Source: RevenueBase Database · checked Sep 22, 2026
24	Magna IV Engineering, A Sunbelt Solomon Company	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 22, 2026	201-500	327 contacts →
	Indirect evidence “Delivering confidence for over 40 years.” Source: RevenueBase Database · checked Sep 22, 2026
25	Taw, An IPS Company	Indirect evidence	Greenville, SC, United StatesHQ checked Sep 22, 2026	501-1,000	305 contacts →
	Indirect evidence “Excellence in creating innovative solutions for the supply, control and use of energy.” Source: RevenueBase Database · checked Sep 22, 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: transformer maintenance 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 transformer maintenance companies.
Partial evidence: Its own public description names part of transformer maintenance companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name transformer maintenance 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 3,767 transformer maintenance companies worldwide

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Transformer maintenance companies worldwide at a glance

As of Sep 22, 2026

21.5%Verified-email coverage

14.9Average contacts per company

11-50Median size (employees)

1.2%Largest-city concentration · Sao Paulo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

1,304

11-50

1,458

51-200

645

201-500

205

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

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among transformer maintenance 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: Every country. Country and city lists for transformer maintenance companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “transformer maintenance 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 transformer maintenance 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 transformer maintenance 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, 12,076 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 22, 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.

Transformer maintenance companies by location

17 lists · largest first

Every Transformer maintenance companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 transformer maintenance 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 transformer maintenance companies are there worldwide?

RevenueBase identified 3,767 transformer maintenance 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?

Engelmig Energia, headquartered in Belo Horizonte, tops this list with the largest team on record.

Which country has the most transformer maintenance companies?

India leads with 583 companies, followed by the United States (450) and Brazil (445). Every transformer maintenance companies list by country and city is linked on this page.

Which city has the most transformer maintenance companies?

Sao Paulo leads with 45 headquartered companies, followed by Lima (32) and Vadodara (30).

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 12,076 verified decision-maker contacts tracked across these 3,767 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 22, 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.