Company lists · Data refreshed October 2026

Top 25 Clean energy engineering companies based in the United States

Name: Clean energy engineering companies 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 4,591 companies tracked

RevenueBase identified 4,591 company matches for clean energy engineering companies associated with the United States as of October 2026 and tracks 145,736 professional contacts across them, including 57,352 with verified work emails. Houston is the largest hub.

This list covers company matches for clean energy engineering companies 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

4,591Companies

145,736Contacts tracked

57,352Verified emails

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

Ranked by team size

Top 25 of 4,591 company matches for clean energy engineering companies 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	Constellation	Exact match	Baltimore, MD, United StatesHQ recorded Oct 9, 2026	10001+	9,888 contacts →
	Exact match “Constellation Energy Corporation (Nasdaq: CEG), a Fortune 200 company headquartered in Baltimore, is the nation’s largest producer of reliable, emissions-free energy and a leading…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
2	Sunrun	Exact match	San Francisco, CA, United StatesHQ recorded Oct 9, 2026	10001+	7,991 contacts →
	Exact match “Life runs on clean energy.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
3	Mortenson	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 9, 2026	5,001-10,000	5,884 contacts →
	Exact match “Mortenson is a U.S-based, top-25 builder, developer and provider of energy and engineering services committed to helping organizations move their strategies forward.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4	Primoris Services Corporation	Exact match	Dallas, TX, United StatesHQ recorded Oct 9, 2026	10001+	4,166 contacts →
	Exact match “Primoris Services Corporation (NYSE: PRIM) is a leading provider of critical infrastructure services to the utility, energy, and renewables markets throughout the United States…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5	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
6	MOSS	Exact match	Fort Lauderdale, FL, United StatesHQ recorded Oct 9, 2026	5,001-10,000	2,323 contacts →
	Exact match “Moss is a national, privately-held construction firm providing innovative solutions resulting in award-winning projects.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	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
8	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
9	Enercon Services, INC	Exact match	Kennesaw, GA, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,980 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
10	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
11	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
12	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
13	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
14	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
15	Affiliated Engineers, INC	Exact match	Madison, WI, United StatesHQ recorded Oct 9, 2026	1,001-5,000	1,059 contacts →
	Exact match “Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	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
17	Suzlon Wind Energy Corporation Sweco	Exact match	Chicago, IL, United StatesHQ recorded Oct 9, 2026	201-500	923 contacts →
	Exact match “Suzlon established its North American operations – Suzlon Wind Energy Corporation - in 2001 with a vision to become the preferred provider of value-added sustainable power plant…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	ION Solar	Exact match	Provo, UT, United StatesHQ recorded Oct 9, 2026	501-1,000	913 contacts →
	Exact match “Ion Solar is a premium, full-service solar provider.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	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
20	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
21	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
22	Pattern Energy	Exact match	San Francisco, CA, United StatesHQ recorded Oct 9, 2026	501-1,000	826 contacts →
	Exact match “Pattern Energy is one of the world’s largest privately-owned developers and operators of wind, solar, transmission, and energy storage projects.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	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
24	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
25	Baker Electric	Exact match	Escondido, CA, United StatesHQ recorded Oct 9, 2026	501-1,000	704 contacts →
	Exact match “Baker Electric is a full-service electrical contractor and energy infrastructure expert headquartered in Escondido, California.” 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 companies”. 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 4,591 clean energy engineering companies based in the United States

See the full list, filter by size, metro and specialty, and access 57,352 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Oct 9, 2026

39.4%Verified-email coverage

31.7Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · Houston

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

1,975

11-50

1,736

51-200

597

201-500

149

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 4,591 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 companies” 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 57,352 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 companies 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 companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 4,591 company matches for clean energy engineering companies 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?

Constellation 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 companies?

Houston leads with 140 company records, followed by New York (113) and Austin (79).

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 57,352 professional contacts with verified work emails tracked across these 4,591 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.