Company lists · Data verified August 2026

Top 25 Energy consulting firms based in the United States

Name: Energy consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 3,927 companies tracked

There are 3,927 energy consulting firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 74,853 professional contacts across them, including 33,265 with verified work emails and 33,416 with mobile numbers. Houston is the largest hub.

This list covers energy consulting firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

3,927Companies

74,853Contacts tracked

33,265Verified emails

33,416Mobile numbers

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The 25 largest energy consulting firms based in the United States

Ranked by team size

Top 25 of 3,927 energy consulting firms based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Sargent & Lundy	Midland, TX	1,001-5,000	4,145	1,118
2	FTI	Menasha, WI	1,001-5,000	2,712	1,126
3	Mckinstry	Scottsdale, AZ	1,001-5,000	2,198	1,583
4	Langan Engineering & Environmental Services	El Segundo, CA	1,001-5,000	2,136	1,662
5	Westwood Professional Services	Lake Charles, LA	1,001-5,000	1,631	1,058
6	Swca Environmental Consultants	Phoenix, AZ	1,001-5,000	1,618	1,159
7	Ameresco	Framingham, MA	1,001-5,000	1,475	1,125
8	Partner Engineering & Science, INC	Pasadena, CA	1,001-5,000	1,348	984
9	Barr Engineering CO	Washington	1,001-5,000	1,098	828
10	Willdan	Anaheim, CA	1,001-5,000	838	636
11	Resource Innovations	Chandler, AZ	501-1,000	724	558
12	Capco Energy	Houston, TX	1,001-5,000	711	152
13	Inerco	Delaware	1,001-5,000	682	90
14	Applied Consultants	Longview, TX	501-1,000	580	39
15	Natural Power	Seattle, WA	501-1,000	505	349
16	Hunt Guillot & Associates HGA	Ruston, LA	501-1,000	499	369
17	Sitelogiq	Minneapolis, MN	501-1,000	451	283
18	Takkion	Evansville, WY	1,001-5,000	360	128
19	Meraki Solar	Dallas, TX	1,001-5,000	274	8
20	Direct Energy Business	Pittsburgh, PA	1,001-5,000	252	75
21	Nuverra Environmental Solutions	Scottsdale, AZ	501-1,000	201	29
22	Power Grid Engineering, LLC	Lake Mary, FL	1,001-5,000	160	50
23	Morrison Energy	Houma, LA	501-1,000	139	71
24	Seam Group	Beachwood, OH	10001+	130	86
25	Synergy Companies	Fresno, CA	501-1,000	124	31

Showing 25 of 3,927 energy consulting firms based in the United States

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Energy consulting firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

HoustonLargest hub · 221 HQs

33,416Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

2,238

11-50

1,197

51-200

336

201-500

501-1,000

1,001-5,000

10001+

Energy consulting firms by metro

Metro	Companies
Energy consulting firms in Houston	221
Energy consulting firms in New York	127
Energy consulting firms in Denver	65
Energy consulting firms in Chicago	65
Energy consulting firms in Dallas	64
Energy consulting firms in Austin	60
Energy consulting firms in Washington	46

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “energy consulting firms”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many energy consulting firms are there based in the United States?

There are 3,927 energy consulting firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most energy consulting firms?

Houston leads with 221 headquartered companies, followed by New York (127) and Denver (65).

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 33,265 verified decision-maker contacts tracked across these 3,927 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.