Company lists · Data refreshed September 2026

Top 25 Smart city decarbonization companies based in the United States

Name: Smart city 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 16, 2026 281 companies tracked

RevenueBase identified 281 smart city decarbonization companies headquartered in the United States as of September 2026 and tracks 20,063 professional contacts across them, including 9,371 with verified work emails. New York is the largest hub.

This list covers smart city 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 16, 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 16, 2026 86% judged on-target in blind review

281Companies

20,063Contacts tracked

9,371Verified emails

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The 25 largest smart city decarbonization companies based in the United States

Ranked by team size

Top 25 of 281 smart city decarbonization companies based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to smart city 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	Carrier	Indirect evidence	Palm Beach Gardens, FL, United StatesHQ checked Sep 16, 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 16, 2026
2	Mckinstry	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 16, 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 16, 2026
3	Ameresco	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 16, 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 16, 2026
4	Franklin Energy	Indirect evidence	Port Washington, WI, United StatesHQ checked Sep 16, 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 16, 2026
5	Energy Solutions	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 16, 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 16, 2026
6	Resource Innovations	Indirect evidence	Half Moon Bay, CA, United StatesHQ checked Sep 16, 2026	501-1,000	733 contacts →
	Indirect evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 16, 2026
7	Veregy	Partial evidence	Phoenix, MO, United StatesHQ checked Sep 16, 2026	501-1,000	383 contacts →
	Partial evidence “Veregy is an award-winning NAESCO-Accredited decarbonization company focusing on accelerating and simplifying the Energy Transition.” Source: RevenueBase Database · checked Sep 16, 2026
8	TRIO	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 16, 2026	201-500	383 contacts →
	Indirect evidence “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Source: RevenueBase Database · checked Sep 16, 2026
9	3degrees Group, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 16, 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 16, 2026
10	Origis Energy	Indirect evidence	Miami, FL, United StatesHQ checked Sep 16, 2026	201-500	220 contacts →
	Indirect evidence “Origis Energy is accelerating the transition to a carbon-free future by Reimagining ZeroSM.” Source: RevenueBase Database · checked Sep 16, 2026
11	Dalkia Energy Solutions	Indirect evidence	Beverly, MA, United StatesHQ checked Sep 16, 2026	201-500	210 contacts →
	Indirect evidence “Dalkia Energy Solutions, a subsidiary of the EDF (Électricité de France) Group, is a national leader in energy efficiency and sustainability for commercial, industrial, and…” Source: RevenueBase Database · checked Sep 16, 2026
12	Bright Power	Partial evidence	New York, NY, United StatesHQ checked Sep 16, 2026	51-200	205 contacts →
	Partial evidence “Bright Power is a leading provider of energy efficiency and decarbonization solutions for the real estate industry.” Source: RevenueBase Database · checked Sep 16, 2026
13	Carbon Direct	Indirect evidence	New York, United StatesHQ checked Sep 16, 2026	51-200	172 contacts →
	Indirect evidence “Carbon Direct is a trusted energy and climate solutions company that combines world-class scientific expertise, technical rigor, and market insights to help clients achieve their…” Source: RevenueBase Database · checked Sep 16, 2026
14	Cleanchoice Energy	Indirect evidence	Washington, DC, United StatesHQ checked Sep 16, 2026	51-200	155 contacts →
	Indirect evidence “CleanChoice Energy is a cleantech company that empowers people and businesses to easily access climate solutions.” Source: RevenueBase Database · checked Sep 16, 2026
15	Energy Network	Indirect evidence	Elkhorn, NE, United StatesHQ checked Sep 16, 2026	201-500	151 contacts →
	Indirect evidence “Energy Network has four areas of expertise, each of which is focused on reducing operational expenses and at the same time augment our clients’ sustainability objectives.” Source: RevenueBase Database · checked Sep 16, 2026
16	Connectm Technology Solutions	Indirect evidence	Marlborough, MA, United StatesHQ checked Sep 16, 2026	51-200	131 contacts →
	Indirect evidence “ConnectM is a clean energy technology and solutions provider for residential and light commercial buildings and all-electric original equipment manufacturers with a proprietary…” Source: RevenueBase Database · checked Sep 16, 2026
17	Luminace	Partial evidence	New York, NY, United StatesHQ checked Sep 16, 2026	51-200	126 contacts →
	Partial evidence “Luminace is one of the largest fully integrated decarbonization-as-a-service solution providers in North America, sponsoring accessible, reliable and renewable energy…” Source: RevenueBase Database · checked Sep 16, 2026
18	Centrio	Indirect evidence	Houston, CO, United StatesHQ checked Sep 16, 2026	201-500	112 contacts →
	Indirect evidence “CenTrio Energy is the leader in providing innovative energy solutions for our clients.” Source: RevenueBase Database · checked Sep 16, 2026
19	Climeco	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	51-200	96 contacts →
	Partial evidence “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: RevenueBase Database · checked Sep 16, 2026
20	Dextall	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 16, 2026	51-200	78 contacts →
	Partial evidence “Our Mission: To accelerate decarbonization of the environment TODAY by bringing affordable and efficient solutions to build sustainably.” Source: RevenueBase Database · checked Sep 16, 2026
21	Heliogen	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 16, 2026	51-200	77 contacts →
	Indirect evidence “Heliogen is a renewable energy technology company focused on decarbonizing industry and empowering a sustainable civilization.” Source: RevenueBase Database · checked Sep 16, 2026
22	Beam Global	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 16, 2026	201-500	75 contacts →
	Indirect evidence “Beam Global is a clean technology innovator which develops and manufactures sustainable infrastructure products and technologies.” Source: RevenueBase Database · checked Sep 16, 2026
23	Utilityinnovation Group	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 16, 2026	51-200	69 contacts →
	Indirect evidence “Using our unique experience in building state-of-the-art, decentralized energy and microgrid systems, we’re shaping the future of the connected electric grid infrastructure.” Source: RevenueBase Database · checked Sep 16, 2026
24	Gridmatic	Indirect evidence	Cupertino, CA, United StatesHQ checked Sep 16, 2026	51-200	65 contacts →
	Indirect evidence “Gridmatic is an AI-powered energy company focused on decarbonizing the grid by helping with the transition to clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
25	Greengen	Indirect evidence	Bethesda, MD, United StatesHQ checked Sep 16, 2026	11-50	60 contacts →
	Indirect evidence “GreenGen is a global leader in energy and sustainability solutions, empowering organizations to Operate in the Green®.” Source: RevenueBase Database · checked Sep 16, 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: smart city 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 smart city decarbonization companies.
Partial evidence: Its own public description names part of smart city decarbonization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name smart city 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 281 smart city decarbonization companies based in the United States

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Smart city decarbonization companies based in the United States at a glance

As of Sep 16, 2026

46.7%Verified-email coverage

71.4Average contacts per company

1-10Median size (employees)

8.5%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

142

11-50

51-200

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 281 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 smart city 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 “smart city 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 smart city 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 smart city 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, 9,371 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 16, 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.

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 smart city 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 smart city decarbonization companies are there based in the United States?

RevenueBase identified 281 smart city 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?

Carrier, headquartered in Palm Beach Gardens, tops this list with the largest team on record.

Which city has the most smart city decarbonization companies?

New York leads with 24 headquartered companies, followed by Houston (17) and San Francisco (11).

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 9,371 verified decision-maker contacts tracked across these 281 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 16, 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.