Company lists · Data refreshed September 2026

Top 25 Energy development consultants based in the United States

RevenueBase identified 2,914 energy development consultants headquartered in the United States as of September 2026 and tracks 58,836 professional contacts across them, including 26,741 with verified work emails. Houston is the largest hub.

This list covers energy development consultants 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
2,914Companies
58,836Contacts tracked
26,741Verified emails
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The 25 largest energy development consultants based in the United States

Ranked by team size
Top 25 of 2,914 energy development consultants 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 development consultants: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceChicago, WY, United StatesHQ checked Sep 16, 20261,001-5,0004,156 contacts →

Indirect evidence

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

Source: RevenueBase Database · checked Sep 16, 2026
2Indirect evidenceParsippany, NJ, United StatesHQ checked Sep 16, 20261,001-5,0002,177 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
3Indirect evidenceHouston, TX, United StatesHQ checked Sep 16, 20261,001-5,0001,932 contacts →

Indirect evidence

“Employee-Owned.”

Source: RevenueBase Database · checked Sep 16, 2026
4Indirect evidencePlano, TX, United StatesHQ checked Sep 16, 20261,001-5,0001,661 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
5Indirect evidenceKent, OH, United StatesHQ checked Sep 16, 20261,001-5,0001,395 contacts →

Indirect evidence

“Davey Resource Group, Inc.(DRG) provides innovative consulting and field services that support utility infrastructure and environmental stewardship.”

Source: RevenueBase Database · checked Sep 16, 2026
6Indirect evidenceTorrance, CA, United StatesHQ checked Sep 16, 20261,001-5,0001,358 contacts →

Indirect evidence

“Partner Assessment Corp.”

Source: RevenueBase Database · checked Sep 16, 2026
7Indirect evidenceSouthfield, MI, United StatesHQ checked Sep 16, 20261,001-5,0001,290 contacts →

Indirect 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
8Indirect evidenceMinneapolis, MN, United StatesHQ checked Sep 16, 20261,001-5,0001,088 contacts →

Indirect 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
9Partial evidenceHomestead, PA, United StatesHQ checked Sep 16, 2026501-1,000964 contacts →

Partial 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
10Indirect evidenceAnaheim, CA, United StatesHQ checked Sep 16, 20261,001-5,000851 contacts →

Indirect 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
11Indirect evidenceEncinitas, CA, United StatesHQ checked Sep 16, 2026501-1,000795 contacts →

Indirect evidence

“Dudek is an environmental, planning, and engineering consulting firm.”

Source: RevenueBase Database · checked Sep 16, 2026
12Partial evidenceCleveland, OK, United StatesHQ checked Sep 16, 20261,001-5,000761 contacts →

Partial evidence

“Cleveland Integrity Services offers support services to companies in the Energy, Telecommunications, and Power industries.”

Source: RevenueBase Database · checked Sep 16, 2026
13Partial evidenceHalf Moon Bay, CA, United StatesHQ checked Sep 16, 2026501-1,000733 contacts →

Partial evidence

“Resource Innovations (RI) is an energy transformation firm.”

Source: RevenueBase Database · checked Sep 16, 2026
14Partial evidenceLongview, TX, United StatesHQ checked Sep 16, 2026501-1,000578 contacts →

Partial evidence

“Since 1991, Applied Consultants Inc.”

Source: RevenueBase Database · checked Sep 16, 2026
15Indirect evidenceWall Township, NJ, United StatesHQ checked Sep 16, 2026201-500447 contacts →

Indirect evidence

“We are Groundwater & Environmental Services, Inc, better known as GES.”

Source: RevenueBase Database · checked Sep 16, 2026
16Indirect evidenceWashington, DC, United StatesHQ checked Sep 16, 202651-200434 contacts →

Indirect evidence

“Synergy Consulting is Global Leader in Financial and Corporate Advisory.”

Source: RevenueBase Database · checked Sep 16, 2026
17Partial evidenceIrvine, CA, United StatesHQ checked Sep 16, 2026201-500383 contacts →

Partial evidence

“We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.”

Source: RevenueBase Database · checked Sep 16, 2026
18Indirect evidenceLong Beach, CA, United StatesHQ checked Sep 16, 2026201-500375 contacts →

Indirect evidence

“P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.”

Source: RevenueBase Database · checked Sep 16, 2026
19Indirect evidenceLincolnshire, IL, United StatesHQ checked Sep 16, 2026201-500365 contacts →

Indirect evidence

“Manhard Consulting has joined Atwell, a national consulting, engineering, and construction services firm with 2,100 technical professionals across the country.”

Source: RevenueBase Database · checked Sep 16, 2026
20Partial evidenceWilliamsville, NY, United StatesHQ checked Sep 16, 2026201-500355 contacts →

Partial evidence

“Wendel is an Architecture, Engineering, Energy Efficiency, and Construction Management Firm that delivers customized solutions and turnkey projects in innovative ways.”

Source: RevenueBase Database · checked Sep 16, 2026
21Indirect evidencePark Ridge, NJ, United StatesHQ checked Sep 16, 2026201-500336 contacts →

Indirect evidence

“National Utility Service, Inc.”

Source: RevenueBase Database · checked Sep 16, 2026
22Indirect evidenceIrvine, CA, United StatesHQ checked Sep 16, 2026201-500332 contacts →

Indirect evidence

“LSA is a diversified environmental, transportation, and community planning firm that evolved from a small consulting firm.”

Source: RevenueBase Database · checked Sep 16, 2026
23Indirect evidenceAppleton, WI, United StatesHQ checked Sep 16, 20261,001-5,000324 contacts →

Indirect evidence

“U.S.”

Source: RevenueBase Database · checked Sep 16, 2026
24Indirect evidenceGainesville, FL, United StatesHQ checked Sep 16, 2026201-500305 contacts →

Indirect evidence

“Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…”

Source: RevenueBase Database · checked Sep 16, 2026
25Partial evidencePortland, OR, United StatesHQ checked Sep 16, 2026201-500288 contacts →

Partial evidence

“At Cascade Energy, we believe in better.”

Source: RevenueBase Database · checked Sep 16, 2026

Showing 25 of 2,914 energy development consultants based in the United States

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Energy development consultants based in the United States at a glance

As of Sep 16, 2026
45.5%Verified-email coverage
20.2Average contacts per company
1-10Median size (employees)
8.1%Largest-city concentration · Houston
Sep 16, 2026Page data refreshed

Companies by employee count

1-10
1,772
11-50
820
51-200
227
201-500
57
501-1,000
13
1,001-5,000
21
10001+
1

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 2,914 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 development consultants, 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 development consultants”. 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 development consultants), 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 development consultants, 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, 26,741 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.

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 development consultants, 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 development consultants are there based in the United States?

RevenueBase identified 2,914 energy development consultants 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 energy development consultants?

Houston leads with 235 headquartered companies, followed by New York (75) and Denver (62).

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 26,741 verified decision-maker contacts tracked across these 2,914 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.