Company lists · Data refreshed September 2026

Top 25 Consulting renewable energy companies based in the United States

RevenueBase identified 1,908 consulting renewable energy companies headquartered in the United States as of September 2026 and tracks 19,699 professional contacts across them, including 7,247 with verified work emails. Houston is the largest hub.

This list covers consulting renewable energy 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 21, 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 21, 2026 86% judged on-target in blind review
1,908Companies
19,699Contacts tracked
7,247Verified emails
Explore this list → Free signup · no credit card · 500 free credits

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

Ranked by team size
Top 25 of 1,908 consulting renewable energy companies based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to consulting renewable energy 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Strong evidenceFargo, ND, United StatesHQ checked Sep 21, 20261,001-5,000933 contacts →

Strong evidence

“Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.”

Source: RevenueBase Database · checked Sep 21, 2026
2Partial evidenceAnaheim, CA, United StatesHQ checked Sep 21, 20261,001-5,000851 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 21, 2026
3Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-200434 contacts →

Partial evidence

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

Source: RevenueBase Database · checked Sep 21, 2026
4Strong evidenceHouston, TX, United StatesHQ checked Sep 21, 20261,001-5,000409 contacts →

Strong evidence

“Signal Energy is a leading full service design/build contractor providing Engineering, Procurement, and Construction (EPC) services for renewable energy & infrastructure projects.”

Source: RevenueBase Database · checked Sep 21, 2026
5Partial evidenceIrvine, CA, United StatesHQ checked Sep 21, 2026201-500383 contacts →

Partial evidence

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

Source: RevenueBase Database · checked Sep 21, 2026
6Indirect evidenceDenver, United StatesHQ checked Sep 21, 2026501-1,000379 contacts →

Indirect evidence

“Established in 2019.”

Source: RevenueBase Database · checked Sep 21, 2026
7Partial evidenceEvansville, WY, United StatesHQ checked Sep 21, 20261,001-5,000358 contacts →

Partial evidence

“TAKKION is Moving Energy Forward.”

Source: RevenueBase Database · checked Sep 21, 2026
8Indirect evidencePark Ridge, NJ, United StatesHQ checked Sep 21, 2026201-500336 contacts →

Indirect evidence

“National Utility Service, Inc.”

Source: RevenueBase Database · checked Sep 21, 2026
9Partial evidenceDuluth, MN, United StatesHQ checked Sep 21, 2026201-500281 contacts →

Partial evidence

“We act as an extension of your team, combining deep energy expertise with seamless alignment to your processes to advance projects with confidence.”

Source: RevenueBase Database · checked Sep 21, 2026
10Indirect evidenceAustin, CA, United StatesHQ checked Sep 21, 2026201-500275 contacts →

Indirect evidence

“The world runs on power.”

Source: RevenueBase Database · checked Sep 21, 2026
11Strong evidenceMinneapolis, MN, United StatesHQ checked Sep 21, 2026201-500264 contacts →

Strong evidence

“Merjent is an environmental, restoration, and engineering consulting firm with a long history serving the energy industry.”

Source: RevenueBase Database · checked Sep 21, 2026
12Strong evidenceHouston, AZ, United StatesHQ checked Sep 21, 2026501-1,000264 contacts →

Strong evidence

“RNWBL is a high-growth services and technology company, specializing in renewable energy solutions.”

Source: RevenueBase Database · checked Sep 21, 2026
13Strong evidenceKirkland, WA, United StatesHQ checked Sep 21, 2026201-500254 contacts →

Strong evidence

“We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.”

Source: RevenueBase Database · checked Sep 21, 2026
14Partial evidenceFairfax, VA, United StatesHQ checked Sep 21, 2026201-500214 contacts →

Partial evidence

“PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.”

Source: RevenueBase Database · checked Sep 21, 2026
15Strong evidenceHalf Moon Bay, CA, United StatesHQ checked Sep 21, 2026201-500183 contacts →

Strong evidence

“Resource Innovations now combined with Nexant is a substantially woman-owned, woman-led energy consulting firm dedicated to creating equal access to clean resources through…”

Source: RevenueBase Database · checked Sep 21, 2026
16Strong evidenceBrooklyn, MD, United StatesHQ checked Sep 21, 2026201-500182 contacts →

Strong evidence

“Green World Renewable Energy delivers smart, scalable solar engineering and back-office design solutions for residential, commercial, and utility-scale projects across the U.S.”

Source: RevenueBase Database · checked Sep 21, 2026
17Partial evidenceHouston, TX, United StatesHQ checked Sep 21, 2026201-500171 contacts →

Partial evidence

“TPH & Co, the energy business of Perella Weinberg, provides strategic and financial advice to investors, management teams, boards of directors, government bodies, and other…”

Source: RevenueBase Database · checked Sep 21, 2026
18Strong evidenceOakland, CA, United StatesHQ checked Sep 21, 202651-200162 contacts →

Strong evidence

“Revamp is the premier engineering firm for large-scale renewable energy projects.”

Source: RevenueBase Database · checked Sep 21, 2026
19Strong evidenceMadison, WI, United StatesHQ checked Sep 21, 202651-200157 contacts →

Strong evidence

“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: RevenueBase Database · checked Sep 21, 2026
20Partial evidenceSan Francisco, CA, United StatesHQ checked Sep 21, 202651-200156 contacts →

Partial evidence

Energy.”

Source: RevenueBase Database · checked Sep 21, 2026
21Indirect evidenceVoorhees, NJ, United StatesHQ checked Sep 21, 202651-200135 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 21, 2026
22Partial evidenceCentennial, CO, United StatesHQ checked Sep 21, 202651-200121 contacts →

Partial evidence

“Halker Consulting provides custom engineered and configured services in Project Assessment and Planning, Engineering and Design, & Consulting and Implementation Guidance.”

Source: RevenueBase Database · checked Sep 21, 2026
23Partial evidenceRedwood City, CA, United StatesHQ checked Sep 21, 2026201-500113 contacts →

Partial evidence

Energy Experts International is a leader in providing management consultation to companies, organizations and end-users on energy issues, both domestically and globally.”

Source: RevenueBase Database · checked Sep 21, 2026
24Partial evidenceSeattle, WA, United StatesHQ checked Sep 21, 202651-200110 contacts →

Partial evidence

“Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.”

Source: RevenueBase Database · checked Sep 21, 2026
25Partial evidenceChantilly, VA, United StatesHQ checked Sep 21, 2026201-500104 contacts →

Partial evidence

“Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.”

Source: RevenueBase Database · checked Sep 21, 2026

Showing 25 of 1,908 consulting renewable energy companies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,247 reachable decision-makers.

Free signup · no credit card

View the full list →

Consulting renewable energy companies based in the United States at a glance

As of Sep 21, 2026
36.8%Verified-email coverage
10.3Average contacts per company
1-10Median size (employees)
4.2%Largest-city concentration · Houston
Sep 21, 2026Page data refreshed

Companies by employee count

1-10
1,145
11-50
558
51-200
154
201-500
26
501-1,000
6
1,001-5,000
11
10001+
2

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 1,908 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 consulting renewable energy 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 “consulting renewable energy 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 consulting renewable energy 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 consulting renewable energy 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, 7,247 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 21, 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 consulting renewable energy 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 consulting renewable energy companies are there based in the United States?

RevenueBase identified 1,908 consulting renewable energy 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?

Wanzek Construction, Inc., A Mastec Company, headquartered in Fargo, tops this list with the largest team on record.

Which city has the most consulting renewable energy companies?

Houston leads with 80 headquartered companies, followed by New York (50) and Denver (39).

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 7,247 verified decision-maker contacts tracked across these 1,908 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 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,908 consulting renewable energy companies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

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.