Company lists · Data refreshed September 2026

Top 25 Energy engineering consulting companies based in the United States

Name: Energy engineering consulting 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 16, 2026 4,552 companies tracked

RevenueBase identified 4,552 energy engineering consulting companies headquartered in the United States as of September 2026 and tracks 149,195 professional contacts across them, including 62,864 with verified work emails. Houston is the largest hub.

This list covers energy engineering consulting 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 16, 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 16, 2026 86% judged on-target in blind review

4,552Companies

149,195Contacts tracked

62,864Verified emails

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The 25 largest energy engineering consulting companies based in the United States

Ranked by team size

Top 25 of 4,552 energy engineering consulting companies based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to energy engineering consulting 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	Mcdermott International, LTD	Strong evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	10001+	20,135 contacts →
	Strong evidence “McDermott is a premier provider of engineering and construction solutions to the energy industry.” Source: RevenueBase Database · checked Sep 16, 2026
2	Mortenson	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 16, 2026	5,001-10,000	5,298 contacts →
	Strong evidence “Mortenson is a U.S-based, top-25 builder, developer and provider of energy and engineering services committed to helping organizations move their strategies forward.” Source: RevenueBase Database · checked Sep 16, 2026
3	Sargent & Lundy	Partial evidence	Chicago, WY, United StatesHQ checked Sep 16, 2026	1,001-5,000	4,156 contacts →
	Partial evidence “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: RevenueBase Database · checked Sep 16, 2026
4	Entrust Solutions Group	Strong evidence	Lisle, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,966 contacts →
	Strong evidence “ENTRUST Solutions Group, an ENR Top 100 company, provides comprehensive and dependable engineering, consulting, and automation services to pipeline companies, gas and electric…” Source: RevenueBase Database · checked Sep 16, 2026
5	FTI	Strong evidence	Menasha, WI, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,741 contacts →
	Strong evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 16, 2026
6	The Haskell Company	Strong evidence	Jacksonville, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,213 contacts →
	Strong evidence “Haskell delivers over $3 billion annually in Architecture, Engineering, Construction (AEC) and Consulting solutions to assure certainty of outcome for complex capital projects…” Source: RevenueBase Database · checked Sep 16, 2026
7	Langan Engineering & Environmental Services	Indirect evidence	Parsippany, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,177 contacts →
	Indirect evidence “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Source: RevenueBase Database · checked Sep 16, 2026
8	Clearesult	Partial evidence	Austin, TX, United StatesHQ checked Sep 16, 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 16, 2026
9	IMEG	Partial evidence	Rock Island, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,985 contacts →
	Partial evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 16, 2026
10	Enercon Services, INC	Strong evidence	Kennesaw, GA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,865 contacts →
	Strong 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 16, 2026
11	Bowman Consulting	Partial evidence	Reston, VA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,666 contacts →
	Partial 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 16, 2026
12	Westwood Professional Services	Indirect evidence	Plano, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,661 contacts →
	Indirect evidence “At Westwood, our purpose is to create a better world for people through our work.” Source: RevenueBase Database · checked Sep 16, 2026
13	Audubon Companies	Strong evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,488 contacts →
	Strong evidence “Founded in 1997, Audubon Companies LLC provides EPC, consulting, fabrication, and field services to energy and industrial operators across the globe.” Source: RevenueBase Database · checked Sep 16, 2026
14	Ameresco	Partial evidence	Framingham, MA, United StatesHQ checked Sep 16, 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 16, 2026
15	Ulteig	Partial evidence	Fargo, ND, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,362 contacts →
	Partial evidence “Ulteig delivers comprehensive design engineering, program management and technical and field services that strengthen infrastructure vital to everyday life.” Source: RevenueBase Database · checked Sep 16, 2026
16	Partner Engineering & Science, INC	Indirect evidence	Torrance, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,358 contacts →
	Indirect evidence “Partner Assessment Corp.” Source: RevenueBase Database · checked Sep 16, 2026
17	Atwell, LLC	Strong evidence	Southfield, MI, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,290 contacts →
	Strong evidence “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Source: RevenueBase Database · checked Sep 16, 2026
18	Barr Engineering CO	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,088 contacts →
	Strong evidence “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: RevenueBase Database · checked Sep 16, 2026
19	Gulf Companies	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,046 contacts →
	Partial evidence “At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Source: RevenueBase Database · checked Sep 16, 2026
20	GAI Consultants, INC	Strong evidence	Homestead, PA, United StatesHQ checked Sep 16, 2026	501-1,000	964 contacts →
	Strong evidence “Transforming ideas into reality® since 1958, GAI Consultants is an engineering, planning, and environmental consulting firm that provides customized solutions and local expertise…” Source: RevenueBase Database · checked Sep 16, 2026
21	Mesa Associates, INC	Partial evidence	Madison, AL, United StatesHQ checked Sep 16, 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 16, 2026
22	Willdan	Partial evidence	Anaheim, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	851 contacts →
	Partial evidence “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Source: RevenueBase Database · checked Sep 16, 2026
23	Syska Hennessy Group	Indirect evidence	New York, United StatesHQ checked Sep 16, 2026	501-1,000	803 contacts →
	Indirect evidence “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Source: RevenueBase Database · checked Sep 16, 2026
24	Percheron, LLC	Strong evidence	Katy, TX, United StatesHQ checked Sep 16, 2026	501-1,000	776 contacts →
	Strong evidence “Percheron streamlines energy infrastructure projects through a comprehensive EPCM (Engineering, Procurement, Construction Management) approach.” Source: RevenueBase Database · checked Sep 16, 2026
25	PAE	Strong evidence	Portland, OR, United StatesHQ checked Sep 16, 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 16, 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 engineering consulting 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 engineering consulting companies.
Partial evidence: Its own public description names part of energy engineering consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy engineering consulting 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 4,552 energy engineering consulting companies based in the United States

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Energy engineering consulting companies based in the United States at a glance

As of Sep 16, 2026

42.1%Verified-email coverage

32.8Average contacts per company

1-10Median size (employees)

5.0%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

2,367

11-50

1,485

51-200

492

201-500

113

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 4,552 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 energy engineering consulting 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 “energy engineering consulting 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 engineering consulting 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 engineering consulting 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, 62,864 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 16, 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 engineering consulting 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 energy engineering consulting 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 engineering consulting companies are there based in the United States?

RevenueBase identified 4,552 energy engineering consulting 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?

Mcdermott International, LTD, headquartered in Houston, tops this list with the largest team on record.

Which city has the most energy engineering consulting companies?

Houston leads with 227 headquartered companies, followed by New York (125) and Austin (69).

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 62,864 verified decision-maker contacts tracked across these 4,552 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 16, 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.