Company lists · Data refreshed September 2026

Top 25 Nuclear engineering consulting firms based in the United States

RevenueBase identified 724 nuclear engineering consulting firms headquartered in the United States as of September 2026 and tracks 54,152 professional contacts across them, including 13,716 with verified work emails and 18,795 with mobile numbers. Houston is the largest hub.

This list covers nuclear engineering 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. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
724Companies
54,152Contacts tracked
13,716Verified emails
18,795Mobile numbers
Unlock all 724 companies Free signup · no credit card · 500 free credits

The 25 largest nuclear engineering consulting firms based in the United States

Ranked by team size
Top 25 of 724 nuclear engineering consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names nuclear engineering consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
Bechtel CorporationPartial evidence
Reston, VA, United StatesHQ checked Sep 5, 202610001+25,068

“Bechtel is a trusted engineering, construction and project management partner to industry and government.”

Source: company website · checked Sep 5, 2026
2
Sargent & LundyPartial evidence
Chicago, WY, United StatesHQ checked Sep 5, 20261,001-5,0004,156

“Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.”

Source: company website · checked Sep 5, 2026
3
NAESIndirect evidence
Issaquah, WA, United StatesHQ checked Sep 5, 20261,001-5,0001,956

“NAES is the power generation industry’s largest independent services provider, with more than 40 years of experience managing risk and turning it into profits.”

Source: company website · checked Sep 5, 2026
4
Enercon Services, INCPartial evidence
Kennesaw, GA, United StatesHQ checked Sep 5, 20261,001-5,0001,865

“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: company website · checked Sep 5, 2026
5
ExponentStrong evidence
Menlo Park, CA, United StatesHQ checked Sep 5, 20261,001-5,0001,560

“In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…”

Source: company website · checked Sep 5, 2026
6
EnergysolutionsPartial evidence
Salt Lake City, UT, United StatesHQ checked Sep 5, 20261,001-5,0001,254

“EnergySolutions is an international nuclear services company headquartered in Salt Lake City, Utah, and Charlotte, North Carolina, with operations across the United States and…”

Source: company website · checked Sep 5, 2026
7Emeryville, CA, United StatesHQ checked Sep 5, 2026501-1,000526

“Dedicated to “Excellence in Engineering,” E2 Consulting Engineers, Inc.(E2) is a professional services firm established in 1988 specializing in a full spectrum of engineering…”

Source: company website · checked Sep 5, 2026
8Sulphur, LA, United StatesHQ checked Sep 5, 2026501-1,000420

“ReCon was established in 1995 and has matured as a high quality and competitive engineering consulting firm providing engineering design and project management services to the…”

Source: company website · checked Sep 5, 2026
9
GSE SolutionsStrong evidence
Columbia, MD, United StatesHQ checked Sep 5, 2026201-500404

“GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.”

Source: company website · checked Sep 5, 2026
10
MPR Associates, INCPartial evidence
Alexandria, VA, United StatesHQ checked Sep 5, 2026201-500353

“In 1964, a trio of visionary engineers, from Admiral Rickover's Naval nuclear propulsion program, set out to form a company built around technical excellence.”

Source: company website · checked Sep 5, 2026
11
C&i EngineeringPartial evidence
Louisville, KY, United StatesHQ checked Sep 5, 2026201-500313

“Chemical & Industrial Engineering, Inc.(C&I) is a full-service Engineering, Design & Procurement firm, providing hands-on design expertise for increasing capacity, improving…”

Source: company website · checked Sep 5, 2026
12
ARIONIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 2026201-500310

“We are A-Team of engineers specializing in the energy industry.”

Source: company website · checked Sep 5, 2026
13Oak Ridge, TN, United StatesHQ checked Sep 5, 2026201-500279

“Founded in 2003, Edgewater Technical Associates, LLC (Edgewater) is a New Mexico-based small business headquartered in Los Alamos, NM, with a national footprint supporting complex…”

Source: company website · checked Sep 5, 2026
14
Sonic SystemsStrong evidence
Wilmington, NC, United StatesHQ checked Sep 5, 2026501-1,000245

“Founded in 1977 Sonic Systems International (SSI) is a full-service quality-consulting firm serving the nuclear power generation utility industry.”

Source: company website · checked Sep 5, 2026
15
Paragon Energy SolutionsPartial evidence
Fort Worth, TX, United StatesHQ checked Sep 5, 2026201-500234

“Paragon tackles the most difficult challenges of the nuclear industry-those faced by the current operating fleet as well as the next generation of advanced reactors.”

Source: company website · checked Sep 5, 2026
16Oak Ridge, TN, United StatesHQ checked Sep 5, 2026201-500224

“Boston Government Services, LLC (BGS) is an engineering, technology, and security firm providing mission-focused solutions for the clean energy, nuclear, and federal programs…”

Source: company website · checked Sep 5, 2026
17
BoswellPartial evidence
South Hackensack, NJ, United StatesHQ checked Sep 5, 2026201-500190

“Boswell is a leading, fully integrated, multi-disciplinary firm providing a comprehensive range of engineering and power & energy services to federal, state, county, and local…”

Source: company website · checked Sep 5, 2026
18Albuquerque, NM, United StatesHQ checked Sep 5, 2026201-500188

“SMSI is a small business providing management and technical/engineering services to the DOE/NNSA, national laboratories, and industrial clients.”

Source: company website · checked Sep 5, 2026
19Mount Laurel, NJ, United StatesHQ checked Sep 5, 2026201-500187

“United Engineers & Constructors is an industry-leading infrastructure engineering, procurement, construction, and consulting company dedicated to improving lives by delivering the…”

Source: company website · checked Sep 5, 2026
20
Thielsch EngineeringIndirect evidence
Cranston, RI, United StatesHQ checked Sep 5, 2026501-1,000175

“Thielsch, Inc.”

Source: company website · checked Sep 5, 2026
21
Spectra Tech, INCStrong evidence
Oak Ridge, TN, United StatesHQ checked Sep 5, 2026201-500162

“Spectra Tech is an engineering, environmental, and nuclear services company that focuses on providing high quality and cost-effective technical solutions for our Federal…”

Source: company website · checked Sep 5, 2026
22Madison, WI, United StatesHQ checked Sep 5, 202651-200157

“PSE is an electrical energy expert that provides relationship-driven engineering and consulting services for forward-thinking partners who pursue long-term energy solutions.”

Source: company website · checked Sep 5, 2026
23Evanston, IL, United StatesHQ checked Sep 5, 202651-200153

“Grumman|Butkus Associates (GBA) is a nationally recognized consulting engineering firm that specializes in mechanical, electrical and plumbing design services and energy and…”

Source: company website · checked Sep 5, 2026
24
Dunham Associates, INCPartial evidence
Minneapolis, MN, United StatesHQ checked Sep 5, 202651-200149

“Dunham is a full service mechanical and electrical consulting firm.”

Source: company website · checked Sep 5, 2026
25
Premier Technology INCIndirect evidence
Blackfoot, ID, United StatesHQ checked Sep 5, 2026201-500138

“Premier Technology, Inc.”

Source: company website · checked Sep 5, 2026

Showing 25 of 724 nuclear engineering consulting firms based in the United States

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Nuclear engineering consulting firms based in the United States at a glance

As of Sep 5, 2026
11-50Median size (employees)
HoustonLargest hub · 23 HQs
18,795Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
341
11-50
234
51-200
101
201-500
22
501-1,000
9
1,001-5,000
10
5,001-10,000
3
10001+
2

Verified emails by last verification

0–30
12,576
31–60
892
61–90
8
90–180
6
180+
234

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 nuclear engineering consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “nuclear engineering consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among nuclear engineering consulting firms, 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 an evidence 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, 13,716 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 5, 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.

Frequently asked

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

RevenueBase identified 724 nuclear engineering consulting firms 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?

Bechtel Corporation, headquartered in Reston, tops this list with the largest team on record.

Which city has the most nuclear engineering consulting firms?

Houston leads with 23 headquartered companies, followed by Austin (9) and Charlotte (9).

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 13,716 verified decision-maker contacts tracked across these 724 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 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 724 nuclear engineering consulting firms based in the United States. Start with a free account, no credit card.

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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 SmartSearch, 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.