Company lists · Data refreshed September 2026

Top 25 Decarbonization companies based in the United States

Name: Decarbonization 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 15, 2026 1,967 companies tracked

RevenueBase identified 1,967 decarbonization companies headquartered in the United States as of September 2026 and tracks 82,820 professional contacts across them, including 35,086 with verified work emails. New York is the largest hub.

This list covers decarbonization 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 15, 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 15, 2026 86% judged on-target in blind review

1,967Companies

82,820Contacts tracked

35,086Verified emails

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The 25 largest decarbonization companies based in the United States

Ranked by team size

Top 25 of 1,967 decarbonization companies based in the United States, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to decarbonization 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 15, 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 15, 2026
2	Carrier	Indirect evidence	Palm Beach Gardens, FL, United StatesHQ checked Sep 15, 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 15, 2026
3	Sargent & Lundy	Indirect evidence	Chicago, WY, United StatesHQ checked Sep 15, 2026	1,001-5,000	4,156 contacts →
	Indirect evidence “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: RevenueBase Database · checked Sep 15, 2026
4	Fieldcore	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 15, 2026	10001+	3,700 contacts →
	Indirect evidence “GE Vernova is a planned, purpose-built global energy company that includes Power, Wind, and Electrification businesses and is supported by its accelerator businesses of Advanced…” Source: RevenueBase Database · checked Sep 15, 2026
5	Mckinstry	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 15, 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 15, 2026
6	Clearesult	Indirect evidence	Austin, TX, United StatesHQ checked Sep 15, 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 15, 2026
7	GE Digital	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 15, 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 15, 2026
8	Ameresco	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 15, 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 15, 2026
9	California Resources Corporation	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,095 contacts →
	Indirect evidence “California Resources Corporation (CRC) is an independent energy and carbon management company committed to energy transition.” Source: RevenueBase Database · checked Sep 15, 2026
10	Franklin Energy	Indirect evidence	Port Washington, WI, United StatesHQ checked Sep 15, 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 15, 2026
11	Energy Solutions	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 15, 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 15, 2026
12	Resource Innovations	Indirect evidence	Half Moon Bay, CA, United StatesHQ checked Sep 15, 2026	501-1,000	733 contacts →
	Indirect evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 15, 2026
13	Watershed	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 15, 2026	201-500	529 contacts →
	Indirect evidence “Watershed is the enterprise sustainability platform.” Source: RevenueBase Database · checked Sep 15, 2026
14	Veregy	Strong evidence	Phoenix, MO, United StatesHQ checked Sep 15, 2026	501-1,000	383 contacts →
	Strong evidence “Veregy is an award-winning NAESCO-Accredited decarbonization company focusing on accelerating and simplifying the Energy Transition.” Source: RevenueBase Database · checked Sep 15, 2026
15	TRIO	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 15, 2026	201-500	383 contacts →
	Indirect evidence “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Source: RevenueBase Database · checked Sep 15, 2026
16	Lanzatech	Indirect evidence	Skokie, IL, United StatesHQ checked Sep 15, 2026	201-500	338 contacts →
	Indirect evidence “Our way of life is built on carbon, from our fuel sources to the materials in our consumer products, but we need a more sustainable way to source it to protect the future of our…” Source: RevenueBase Database · checked Sep 15, 2026
17	NUS Consulting Group	Indirect evidence	Park Ridge, NJ, United StatesHQ checked Sep 15, 2026	201-500	336 contacts →
	Indirect evidence “National Utility Service, Inc.” Source: RevenueBase Database · checked Sep 15, 2026
18	VEIC	Indirect evidence	Winooski, VT, United StatesHQ checked Sep 15, 2026	201-500	326 contacts →
	Indirect evidence “For 40 years, VEIC has helped energy leaders nationwide meet their clean energy goals.” Source: RevenueBase Database · checked Sep 15, 2026
19	3degrees Group, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 15, 2026	201-500	324 contacts →
	Indirect evidence “3Degrees is a leading global climate solutions provider, pioneer of environmental markets, and Certified B Corporation.” Source: RevenueBase Database · checked Sep 15, 2026
20	Cimarron	Indirect evidence	Houston, TX, United StatesHQ checked Sep 15, 2026	501-1,000	306 contacts →
	Indirect evidence “With decades of operating history and innovation across our trusted brands, Cimarron provides technology-driven emissions management solutions for the global energy system.” Source: RevenueBase Database · checked Sep 15, 2026
21	Cascade Energy	Indirect evidence	Portland, OR, United StatesHQ checked Sep 15, 2026	201-500	288 contacts →
	Indirect evidence “At Cascade Energy, we believe in better.” Source: RevenueBase Database · checked Sep 15, 2026
22	Vicinity Energy	Indirect evidence	Boston, MA, United StatesHQ checked Sep 15, 2026	501-1,000	286 contacts →
	Indirect evidence “Vicinity Energy is a leading district energy company that owns and operates the largest portfolio of district energy systems nationwide, providing steam, hot water, and chilled…” Source: RevenueBase Database · checked Sep 15, 2026
23	Baywa R.E. Americas	Indirect evidence	Carlsbad, CA, United StatesHQ checked Sep 15, 2026	201-500	244 contacts →
	Indirect evidence “rethinkenergy BayWa r.e is a leading global renewable energy company committed to delivering best-in-class projects, services and solutions.” Source: RevenueBase Database · checked Sep 15, 2026
24	WREN	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 15, 2026	n/a	240 contacts →
	Indirect evidence “Wren Climate, PBC helps you live carbon neutral by accounting for and offsetting your carbon emissions through transparent climate projects.” Source: RevenueBase Database · checked Sep 15, 2026
25	Twelve	Indirect evidence	Berkeley, CA, United StatesHQ checked Sep 15, 2026	201-500	224 contacts →
	Indirect evidence “Twelve™ produces fuels and feedstock for thousands of everyday products from CO2 and electricity.” Source: RevenueBase Database · checked Sep 15, 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: decarbonization 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 decarbonization companies.
Partial evidence: Its own public description names part of decarbonization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name decarbonization 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 1,967 decarbonization companies based in the United States

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Decarbonization companies based in the United States at a glance

As of Sep 15, 2026

42.4%Verified-email coverage

42.1Average contacts per company

1-10Median size (employees)

6.3%Largest-city concentration · New York

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

1,138

11-50

580

51-200

175

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 1,967 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 decarbonization 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 “decarbonization 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 decarbonization 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 decarbonization 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, 35,086 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 15, 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.

Decarbonization 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 decarbonization 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 decarbonization companies are there based in the United States?

RevenueBase identified 1,967 decarbonization 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 decarbonization companies?

New York leads with 124 headquartered companies, followed by Houston (114) and San Francisco (54).

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 35,086 verified decision-maker contacts tracked across these 1,967 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 15, 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.