Company lists · Data refreshed October 2026

Top 25 Clean energy engineering firms based in the United States

Name: Clean energy engineering firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 9, 2026 3,999 companies tracked

RevenueBase identified 3,999 company matches for clean energy engineering firms associated with the United States as of October 2026 and tracks 92,388 professional contacts across them, including 35,246 with verified work emails. New York is the largest hub.

This list covers company matches for clean energy engineering firms associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 9, 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 RevenueBase SmartSearch · Exact Recorded Oct 9, 2026 How this list was built

3,999Companies

92,388Contacts tracked

35,246Verified emails

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The 25 largest clean energy engineering firms based in the United States

Ranked by team size

Top 25 of 3,999 company matches for clean energy engineering firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 9, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	FTI	Exact match	Menasha, WI, United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,979 contacts →
	Exact match “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
2	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,293 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
3	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 9, 2026	1,001-5,000	2,206 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4	Mitsubishi Power Americas	Exact match	Lake Mary, FL, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,984 contacts →
	Exact match “Mitsubishi Power Americas is creating a future that works for people and the planet through innovative power generation technology and solutions.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,801 contacts →
	Exact match “At Westwood, our purpose is to create a better world for people through our work.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
6	Trinity Solar	Exact match	Wall Township, NJ, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,782 contacts →
	Exact match “Trinity Solar is one of the largest privately held residential solar companies in the nation.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,513 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
8	Ulteig	Exact match	Fargo, ND, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,460 contacts →
	Exact match “Ulteig delivers comprehensive design engineering, program management and technical and field services that strengthen infrastructure vital to everyday life.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
9	Solv Energy	Exact match	San Diego, CA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,437 contacts →
	Exact match “SOLV Energy is a renewable energy solutions provider for utility solar, energy storage, and high voltage projects in North America.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
10	Wanzek Construction, Inc., A Mastec Company	Exact match	Fargo, ND, United StatesHQ recorded Oct 9, 2026	1,001-5,000	946 contacts →
	Exact match “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	872 contacts →
	Exact match “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
12	PAE	Exact match	Portland, OR, United StatesHQ recorded Oct 9, 2026	201-500	835 contacts →
	Exact match “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13	Percheron, LLC	Exact match	Katy, TX, United StatesHQ recorded Oct 9, 2026	501-1,000	831 contacts →
	Exact match “Percheron streamlines energy infrastructure projects through a comprehensive EPCM (Engineering, Procurement, Construction Management) approach.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
14	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Oct 9, 2026	201-500	792 contacts →
	Exact match “Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
15	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Oct 9, 2026	501-1,000	774 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	SEL Construction Corporation	Exact match	Loomis, CA, United StatesHQ recorded Oct 9, 2026	n/a	722 contacts →
	Exact match “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17	Depcom Power, INC	Exact match	Scottsdale, AZ, United StatesHQ recorded Oct 9, 2026	1,001-5,000	631 contacts →
	Exact match “DEPCOM Power, a Koch Engineered Solutions Company, is a leading solar energy solutions partner providing Development Support, Engineering, Procurement & Construction (EPC)…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	Nexamp	Exact match	Boston, MA, United StatesHQ recorded Oct 9, 2026	201-500	610 contacts →
	Exact match “Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	Apex Clean Energy	Exact match	Charlottesville, VA, United StatesHQ recorded Oct 9, 2026	201-500	574 contacts →
	Exact match “Apex Clean Energy was founded with a singular focus: to accelerate the shift to clean energy.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20	Vanderweil Engineers	Exact match	Boston, MA, United StatesHQ recorded Oct 9, 2026	201-500	562 contacts →
	Exact match “Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21	RRC Companies	Exact match	Round Rock, TX, United StatesHQ recorded Oct 9, 2026	201-500	544 contacts →
	Exact match “RRC is a top-tier designer of utility-scale wind, solar, energy storage, data center, and oil & gas projects in the US and select international markets.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22	Arb, INC	Exact match	Irvine, CA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	535 contacts →
	Exact match “ARB Inc.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	Babcock Power	Exact match	Danvers, MA, United StatesHQ recorded Oct 9, 2026	501-1,000	509 contacts →
	Exact match “Finding a single capable partner to support both large- and small-scale power generation needs can be challenging.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
24	Atlas Renewable Energy	Exact match	Miami, FL, United StatesHQ recorded Oct 9, 2026	201-500	493 contacts →
	Exact match “Atlas Renewable Energy delivers clean energy at scale.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
25	Sitelogiq	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 9, 2026	501-1,000	491 contacts →
	Exact match “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “clean energy engineering firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 3,999 clean energy engineering firms based in the United States

See the full list, filter by size, metro and specialty, and access 35,246 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Clean energy engineering firms based in the United States at a glance

As of Oct 9, 2026

38.1%Verified-email coverage

23.1Average contacts per company

11-50Median size (employees)

2.6%Largest-city concentration · New York

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

1,842

11-50

1,476

51-200

465

201-500

120

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 3,999 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with the United States whose business descriptions match “clean energy engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 35,246 professional contacts with verified work emails across the full matched dataset. 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 October 9, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Clean energy engineering firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “clean energy engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 3,999 company matches for clean energy engineering firms associated with the United States as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

FTI tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most clean energy engineering firms?

New York leads with 104 company records, followed by Houston (101) and Austin (67).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 35,246 professional contacts with verified work emails tracked across these 3,999 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 9, 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 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.