Company lists · Data refreshed September 2026

Top 25 Renewable energy engineering firms based in the United States

Name: Renewable 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 Sep 17, 2026 4,063 companies tracked

RevenueBase identified 4,063 renewable energy engineering firms headquartered in the United States as of September 2026 and tracks 90,882 professional contacts across them, including 35,832 with verified work emails. Houston is the largest hub.

This list covers renewable energy engineering 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 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 17, 2026 86% judged on-target in blind review

4,063Companies

90,882Contacts tracked

35,832Verified emails

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

Ranked by team size

Top 25 of 4,063 renewable energy engineering firms based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to renewable energy engineering firms: 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Sunrun	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 17, 2026	10001+	7,974 contacts →
	Partial evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 17, 2026
2	Sargent & Lundy	Partial evidence	Chicago, WY, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,156 contacts →
	Partial evidence “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: RevenueBase Database · checked Sep 17, 2026
3	FTI	Strong evidence	Menasha, WI, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,741 contacts →
	Strong evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 17, 2026
4	MOSS	Indirect evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 17, 2026	5,001-10,000	2,214 contacts →
	Indirect evidence “Moss is a national, privately-held construction firm providing innovative solutions resulting in award-winning projects.” Source: RevenueBase Database · checked Sep 17, 2026
5	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 17, 2026
6	Trinity Solar	Indirect evidence	Wall Township, NJ, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,794 contacts →
	Indirect evidence “Trinity Solar is one of the largest privately held residential solar companies in the nation.” Source: RevenueBase Database · checked Sep 17, 2026
7	Westwood Professional Services	Indirect evidence	Plano, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,661 contacts →
	Indirect evidence “At Westwood, our purpose is to create a better world for people through our work.” Source: RevenueBase Database · checked Sep 17, 2026
8	Ameresco	Partial evidence	Framingham, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,383 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
9	Solv Energy	Strong evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,286 contacts →
	Strong evidence “SOLV Energy is a renewable energy solutions provider for utility solar, energy storage, and high voltage projects in North America.” Source: RevenueBase Database · checked Sep 17, 2026
10	Wanzek Construction, Inc., A Mastec Company	Strong evidence	Fargo, ND, United StatesHQ checked Sep 17, 2026	1,001-5,000	933 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 17, 2026
11	ION Solar	Indirect evidence	Provo, UT, United StatesHQ checked Sep 17, 2026	501-1,000	912 contacts →
	Indirect evidence “Ion Solar is a premium, full-service solar provider.” Source: RevenueBase Database · checked Sep 17, 2026
12	PAE	Strong evidence	Portland, OR, United StatesHQ checked Sep 17, 2026	201-500	744 contacts →
	Strong evidence “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Source: RevenueBase Database · checked Sep 17, 2026
13	Resource Innovations	Partial evidence	Half Moon Bay, CA, United StatesHQ checked Sep 17, 2026	501-1,000	733 contacts →
	Partial evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 17, 2026
14	SEL Construction Corporation	Strong evidence	Loomis, CA, United StatesHQ checked Sep 17, 2026	n/a	722 contacts →
	Strong evidence “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Source: RevenueBase Database · checked Sep 17, 2026
15	Depcom Power, INC	Strong evidence	Scottsdale, AZ, United StatesHQ checked Sep 17, 2026	1,001-5,000	624 contacts →
	Strong evidence “DEPCOM Power, a Koch Engineered Solutions Company, is a leading solar energy solutions partner providing Development Support, Engineering, Procurement & Construction (EPC)…” Source: RevenueBase Database · checked Sep 17, 2026
16	Nexamp	Partial evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	201-500	607 contacts →
	Partial evidence “Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.” Source: RevenueBase Database · checked Sep 17, 2026
17	Brahma Group, INC	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 17, 2026	1,001-5,000	581 contacts →
	Indirect evidence “Brahma Group, Inc.(Brahma) is a full service project management and industrial construction company, with active projects nationwide.” Source: RevenueBase Database · checked Sep 17, 2026
18	Vanderweil Engineers	Partial evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	201-500	545 contacts →
	Partial evidence “Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and…” Source: RevenueBase Database · checked Sep 17, 2026
19	RRC Companies	Partial evidence	Round Rock, TX, United StatesHQ checked Sep 17, 2026	201-500	494 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
20	Freedom Solar Pros LLC	Indirect evidence	Chandler, AZ, United StatesHQ checked Sep 17, 2026	51-200	484 contacts →
	Indirect evidence “The future of Solar Sales” Source: RevenueBase Database · checked Sep 17, 2026
21	Noresco	Partial evidence	Westborough, MA, United StatesHQ checked Sep 17, 2026	201-500	481 contacts →
	Partial evidence “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Source: RevenueBase Database · checked Sep 17, 2026
22	Babcock Power	Indirect evidence	Danvers, MA, United StatesHQ checked Sep 17, 2026	501-1,000	476 contacts →
	Indirect evidence “Finding a single capable partner to support both large- and small-scale power generation needs can be challenging.” Source: RevenueBase Database · checked Sep 17, 2026
23	REC Solar	Indirect evidence	San Luis Obispo, CA, United StatesHQ checked Sep 17, 2026	n/a	471 contacts →
	Indirect evidence “Founded in 1997, REC Solar has emerged as a leader in the solar industry, installing 800+ solar and storage solutions for commercial and public sector customers nationwide.” Source: RevenueBase Database · checked Sep 17, 2026
24	Enfinity Global	Indirect evidence	Miami, FL, United StatesHQ checked Sep 17, 2026	201-500	428 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
25	Signal Energy	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	409 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 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: renewable energy engineering firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names renewable energy engineering firms.
Partial evidence: Its own public description names part of renewable energy engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name renewable energy engineering firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 4,063 renewable energy engineering firms based in the United States

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

As of Sep 17, 2026

39.4%Verified-email coverage

22.4Average contacts per company

11-50Median size (employees)

2.6%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,810

11-50

1,574

51-200

492

201-500

102

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 4,063 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 renewable energy engineering firms, 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 “renewable energy engineering firms”. 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 renewable energy engineering firms), 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 renewable energy engineering 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 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, 35,832 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 17, 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.

Renewable energy engineering firms by metro

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 renewable energy engineering firms, 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 renewable energy engineering firms are there based in the United States?

RevenueBase identified 4,063 renewable energy engineering 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?

Sunrun, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most renewable energy engineering firms?

Houston leads with 107 headquartered companies, followed by New York (88) and San Diego (66).

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 35,832 verified decision-maker contacts tracked across these 4,063 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 17, 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.