Company lists · Data refreshed September 2026

Top 25 Electrical system design companies based in the United States

Name: Electrical system design companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 6,348 companies tracked

RevenueBase identified 6,348 electrical system design companies headquartered in the United States as of September 2026 and tracks 133,653 professional contacts across them, including 51,397 with verified work emails. Houston is the largest hub.

This list covers electrical system design companies headquartered in the United States, 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 19, 2026.

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 19, 2026 86% judged on-target in blind review

6,348Companies

133,653Contacts tracked

51,397Verified emails

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The 25 largest electrical system design companies based in the United States

Ranked by team size

Top 25 of 6,348 electrical system design companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to electrical system design 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	Sargent & Lundy	Indirect evidence	Chicago, WY, United StatesHQ checked Sep 19, 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 19, 2026
2	IES Holdings	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	2,567 contacts →
	Partial evidence “IES Holdings, Inc.(formerly known as Integrated Electrical Services, Inc.) provides electrical contracting services to commercial, industrial, and residential customers in the…” Source: RevenueBase Database · checked Sep 19, 2026
3	Enercon Services, INC	Indirect evidence	Kennesaw, GA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,865 contacts →
	Indirect 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 19, 2026
4	Bowman Consulting	Indirect evidence	Reston, VA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,666 contacts →
	Indirect evidence “Headquartered in Reston, Virginia, Bowman is a national engineering services firm delivering infrastructure solutions to customers who own, develop and maintain the built…” Source: RevenueBase Database · checked Sep 19, 2026
5	Helix Electric	Strong evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,560 contacts →
	Strong evidence “Helix Electric is an award-winning electrical contractor specializing in design-build and highly complex electrical projects throughout the United States.” Source: RevenueBase Database · checked Sep 19, 2026
6	Bergelectric	Partial evidence	Carlsbad, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,182 contacts →
	Partial evidence “Since their inception in 1946, Bergelectric has made its mark on the construction industry by providing the highest quality electrical and technology contracting.” Source: RevenueBase Database · checked Sep 19, 2026
7	Henderson Engineers	Strong evidence	Lenexa, KS, United StatesHQ checked Sep 19, 2026	501-1,000	1,040 contacts →
	Strong evidence “Henderson Engineers is a national building systems design firm with a wide array of engineering services and a portfolio representing a full range of markets including business…” Source: RevenueBase Database · checked Sep 19, 2026
8	Affiliated Engineers, INC	Indirect evidence	Madison, WI, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,012 contacts →
	Indirect evidence “Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.” Source: RevenueBase Database · checked Sep 19, 2026
9	Industrial Electric Mfg. IEM	Strong evidence	Fremont, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	969 contacts →
	Strong evidence “Industrial Electric Mfg.(IEM) is the largest independent full-line manufacturer of electrical distribution equipment and integrated power systems in the U.S.” Source: RevenueBase Database · checked Sep 19, 2026
10	Mesa Associates, INC	Partial evidence	Madison, AL, United StatesHQ checked Sep 19, 2026	1,001-5,000	897 contacts →
	Partial evidence “Mesa is a full service engineering, procurement, and construction management firm specializing in providing engineering services to electric utility, heavy industrial, and…” Source: RevenueBase Database · checked Sep 19, 2026
11	Flanders	Indirect evidence	Evansville, IN, United StatesHQ checked Sep 19, 2026	501-1,000	789 contacts →
	Indirect evidence “FLANDERS, Leverage our legacy.” Source: RevenueBase Database · checked Sep 19, 2026
12	Elec-Tech Electrical Contractors	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 19, 2026	n/a	782 contacts →
	Indirect evidence “WELCOME TO OUR WEBSITE!” Source: RevenueBase Database · checked Sep 19, 2026
13	PAE	Strong evidence	Portland, OR, United StatesHQ checked Sep 19, 2026	201-500	744 contacts →
	Strong evidence “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Source: RevenueBase Database · checked Sep 19, 2026
14	SASCO	Strong evidence	Fullerton, CA, United StatesHQ checked Sep 19, 2026	501-1,000	734 contacts →
	Strong evidence “SASCO has been a leader in electrical construction and low-voltage systems technologies for 50 years.” Source: RevenueBase Database · checked Sep 19, 2026
15	ME Engineers	Strong evidence	Golden, CO, United StatesHQ checked Sep 19, 2026	201-500	696 contacts →
	Strong evidence “ME Engineers has earned a reputation as a global leader in the design of innovative MEPT systems that bring to life the world's most innovative sports and entertainment venues.” Source: RevenueBase Database · checked Sep 19, 2026
16	Prism Electric	Indirect evidence	Garland, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	687 contacts →
	Indirect evidence “Our story began in 1994 with a simple vision: Build a company that does things right.” Source: RevenueBase Database · checked Sep 19, 2026
17	Prime Electric	Indirect evidence	Bellevue, WA, United StatesHQ checked Sep 19, 2026	1,001-5,000	670 contacts →
	Indirect evidence “For over a quarter century, Prime has been successfully engineering, constructing building, and facilities solutions for our clientele.” Source: RevenueBase Database · checked Sep 19, 2026
18	Cache Valley Electric	Partial evidence	Logan, UT, United StatesHQ checked Sep 19, 2026	1,001-5,000	627 contacts →
	Partial evidence “As one of the nation’s premier electrical contractors, we don’t just provide high-quality services.” Source: RevenueBase Database · checked Sep 19, 2026
19	Cummings Electrical	Partial evidence	Fort Worth, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	626 contacts →
	Partial evidence “Cummings Electrical,(Cummings) is one of the largest providers of electrical contracting services in DFW market.” Source: RevenueBase Database · checked Sep 19, 2026
20	M. J. Electric, LLC	Indirect evidence	Iron Mountain, MI, United StatesHQ checked Sep 19, 2026	1,001-5,000	621 contacts →
	Indirect evidence “M.” Source: RevenueBase Database · checked Sep 19, 2026
21	PAR Electrical Contractors, LLC	Partial evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	1,001-5,000	606 contacts →
	Partial evidence “PAR, a Quanta Services company, offers a full range of construction services for substations, overhead and underground distribution and transmission lines, engineering, design…” Source: RevenueBase Database · checked Sep 19, 2026
22	Alterman, INC	Partial evidence	Live Oak, TX, United StatesHQ checked Sep 19, 2026	501-1,000	597 contacts →
	Partial evidence “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Source: RevenueBase Database · checked Sep 19, 2026
23	Colonialwebb	Indirect evidence	Richmond, VA, United StatesHQ checked Sep 19, 2026	1,001-5,000	571 contacts →
	Indirect evidence “ColonialWebb is built on a simple belief: when people feel like they belong and have a purpose, they can achieve almost anything.” Source: RevenueBase Database · checked Sep 19, 2026
24	CSI Electrical Contractors, INC	Strong evidence	Santa Fe Springs, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	560 contacts →
	Strong evidence “Founded in 1990, CSI has become a leader in highly technical and innovative electrical design and construction.” Source: RevenueBase Database · checked Sep 19, 2026
25	Vanderweil Engineers	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	545 contacts →
	Partial evidence “Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and…” Source: RevenueBase Database · checked Sep 19, 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: electrical system design 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 electrical system design companies.
Partial evidence: Its own public description names part of electrical system design companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical system design 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 6,348 electrical system design companies based in the United States

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Electrical system design companies based in the United States at a glance

As of Sep 19, 2026

38.5%Verified-email coverage

21.1Average contacts per company

11-50Median size (employees)

2.2%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

2,670

11-50

2,331

51-200

985

201-500

201

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 6,348 companies.

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 electrical system design 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “electrical system design 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 electrical system design 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 electrical system design companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 51,397 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 19, 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.

Electrical system design companies by metro

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 electrical system design 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 electrical system design companies are there based in the United States?

RevenueBase identified 6,348 electrical system design companies headquartered in the United States 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?

Sargent & Lundy, headquartered in Casper, tops this list with the largest team on record.

Which city has the most electrical system design companies?

Houston leads with 139 headquartered companies, followed by New York (104) and Denver (52).

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 51,397 verified decision-maker contacts tracked across these 6,348 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 19, 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.