Company lists · Data refreshed September 2026

Top 25 Clean tech companies based in the United States

Name: Clean tech companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 3,164 companies tracked

RevenueBase identified 3,164 clean tech companies headquartered in the United States as of September 2026 and tracks 121,084 professional contacts across them, including 46,817 with verified work emails. New York is the largest hub.

This list covers clean tech 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 19, 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 19, 2026 86% judged on-target in blind review

3,164Companies

121,084Contacts tracked

46,817Verified emails

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The 25 largest clean tech companies based in the United States

Ranked by team size

Top 25 of 3,164 clean tech companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to clean tech 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	GE Vernova	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	10001+	29,528 contacts →
	Indirect evidence “GE Vernova is a purpose-built energy technology company on a mission to electrify to thrive and decarbonize the world.” Source: RevenueBase Database · checked Sep 19, 2026
2	TRANE	Indirect evidence	Davidson, NC, United StatesHQ checked Sep 19, 2026	10001+	10,272 contacts →
	Indirect evidence “Trane is the building technology and energy solutions leader who deploys a depth and breadth of expertise, backgrounds, and perspectives to innovate new technologies and…” Source: RevenueBase Database · checked Sep 19, 2026
3	Carrier	Indirect evidence	Palm Beach Gardens, FL, United StatesHQ checked Sep 19, 2026	10001+	7,665 contacts →
	Indirect evidence “Carrier is a global leader in intelligent climate and energy solutions, pioneering sustainable innovations in climate technologies.” Source: RevenueBase Database · checked Sep 19, 2026
4	The AES Corporation	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,387 contacts →
	Indirect evidence “The world no longer thinks of energy as a matter of supply and demand.” Source: RevenueBase Database · checked Sep 19, 2026
5	Generac	Indirect evidence	Waukesha, WI, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,797 contacts →
	Indirect evidence “Generac is the total energy solutions company powering a smarter world.” Source: RevenueBase Database · checked Sep 19, 2026
6	FTI	Indirect evidence	Menasha, WI, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,741 contacts →
	Indirect evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 19, 2026
7	Mckinstry	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,213 contacts →
	Indirect 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 19, 2026
8	Clearesult	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,121 contacts →
	Indirect evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Sep 19, 2026
9	GE Digital	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,763 contacts →
	Indirect evidence “At GE Digital, our focus is clear: delivering software that accelerates a new era of energy.” Source: RevenueBase Database · checked Sep 19, 2026
10	Ameresco	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,383 contacts →
	Indirect 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 19, 2026
11	Community Dreams Foundation	Partial evidence	Orlando, FL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,009 contacts →
	Partial evidence “We are a purpose-driven organization focused on empowering communities through clean energy, technology innovation, and collaborative partnerships.” Source: RevenueBase Database · checked Sep 19, 2026
12	Sunnova Energy	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	906 contacts →
	Partial evidence “Sunnova Energy International Inc.(NYSE: NOVA) is an industry-leading energy services company focused on making clean energy more accessible, reliable, and affordable for…” Source: RevenueBase Database · checked Sep 19, 2026
13	Franklin Energy	Indirect evidence	Port Washington, WI, United StatesHQ checked Sep 19, 2026	1,001-5,000	838 contacts →
	Indirect evidence “Franklin Energy delivers end-to-end sustainability solutions through a portfolio of intelligent products and services that lower energy costs, reduce carbon and waste, and grow…” Source: RevenueBase Database · checked Sep 19, 2026
14	Energy Solutions	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	201-500	772 contacts →
	Indirect evidence “Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.” Source: RevenueBase Database · checked Sep 19, 2026
15	Resource Innovations	Indirect evidence	Half Moon Bay, CA, United StatesHQ checked Sep 19, 2026	501-1,000	733 contacts →
	Indirect evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 19, 2026
16	LUMIO	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 19, 2026	5,001-10,000	719 contacts →
	Indirect evidence “We’re on a mission to make power personal.” Source: RevenueBase Database · checked Sep 19, 2026
17	Depcom Power, INC	Indirect evidence	Scottsdale, AZ, United StatesHQ checked Sep 19, 2026	1,001-5,000	624 contacts →
	Indirect 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 19, 2026
18	Nexamp	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	607 contacts →
	Indirect 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 19, 2026
19	Apex Clean Energy	Partial evidence	Charlottesville, VA, United StatesHQ checked Sep 19, 2026	201-500	594 contacts →
	Partial evidence “Apex Clean Energy was founded with a singular focus: to accelerate the shift to clean energy.” Source: RevenueBase Database · checked Sep 19, 2026
20	Corvias	Indirect evidence	Warwick, RI, United StatesHQ checked Sep 19, 2026	501-1,000	573 contacts →
	Indirect evidence “Our people are the heart and soul of our company.” Source: RevenueBase Database · checked Sep 19, 2026
21	Schneider Electric Sustainability Business	Indirect evidence	Louisville, KY, United StatesHQ checked Sep 19, 2026	1,001-5,000	571 contacts →
	Indirect evidence “We are your digital partner for sustainability and efficiency, ensuring Life Is On, for homes, buildings, data centers, infrastructure and industries.” Source: RevenueBase Database · checked Sep 19, 2026
22	Palmetto	Strong evidence	Charlotte, NC, United StatesHQ checked Sep 19, 2026	201-500	539 contacts →
	Strong evidence “Palmetto is a leading clean tech company on a mission to accelerate the transition to a clean energy future.” Source: RevenueBase Database · checked Sep 19, 2026
23	Watershed	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	201-500	529 contacts →
	Indirect evidence “Watershed is the enterprise sustainability platform.” Source: RevenueBase Database · checked Sep 19, 2026
24	GTI Energy	Indirect evidence	Des Plaines, IL, United StatesHQ checked Sep 19, 2026	201-500	513 contacts →
	Indirect evidence “For more than eight decades, GTI Energy has contributed to the strengthening of energy systems and the communities they serve.” Source: RevenueBase Database · checked Sep 19, 2026
25	Posigen	Indirect evidence	St. Rose, LA, United StatesHQ checked Sep 19, 2026	501-1,000	507 contacts →
	Indirect evidence “PosiGen is the nation's leading residential solar and energy efficiency provider.” Source: RevenueBase Database · checked Sep 19, 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: clean tech companies. 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 clean tech companies.
Partial evidence: Its own public description names part of clean tech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean tech companies. 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 3,164 clean tech companies based in the United States

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Clean tech companies based in the United States at a glance

As of Sep 19, 2026

38.7%Verified-email coverage

38.3Average contacts per company

1-10Median size (employees)

3.9%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,629

11-50

1,022

51-200

351

201-500

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 3,164 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 clean tech 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 “clean tech 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 clean tech 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 clean tech 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, 46,817 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 19, 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.

Clean tech companies 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 clean tech 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 clean tech companies are there based in the United States?

RevenueBase identified 3,164 clean tech 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?

GE Vernova, headquartered in Boston, tops this list with the largest team on record.

Which city has the most clean tech companies?

New York leads with 122 headquartered companies, followed by Houston (107) and Chicago (61).

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 46,817 verified decision-maker contacts tracked across these 3,164 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 19, 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.