Company lists · Data refreshed September 2026

Top 25 Net zero consulting firms based in the United States

Name: Net zero consulting 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 5, 2026 747 companies tracked

RevenueBase identified 747 net zero consulting firms headquartered in the United States as of September 2026 and tracks 11,622 professional contacts across them, including 5,661 with verified work emails and 4,798 with mobile numbers. New York is the largest hub.

This list covers net zero consulting 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 5, 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 5, 2026 86% judged on-target in blind review

747Companies

11,622Contacts tracked

5,661Verified emails

4,798Mobile numbers

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The 25 largest net zero consulting firms based in the United States

Ranked by team size

Top 25 of 747 net zero consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to net zero consulting 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	Mckinstry	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 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 5, 2026
2	OLA	Partial evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	n/a	1,145 contacts →
	Partial evidence “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Source: RevenueBase Database · checked Sep 5, 2026
3	Franklin Energy	Indirect evidence	Port Washington, WI, United StatesHQ checked Sep 5, 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 5, 2026
4	Energy Solutions	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 5, 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 5, 2026
5	TRIO	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 5, 2026	201-500	383 contacts →
	Indirect evidence “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Source: RevenueBase Database · checked Sep 5, 2026
6	NUS Consulting Group	Indirect evidence	Park Ridge, NJ, United StatesHQ checked Sep 5, 2026	201-500	336 contacts →
	Indirect evidence “National Utility Service, Inc.” Source: RevenueBase Database · checked Sep 5, 2026
7	3degrees Group, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 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 5, 2026
8	Cascade Energy	Indirect evidence	Portland, OR, United StatesHQ checked Sep 5, 2026	201-500	288 contacts →
	Indirect evidence “At Cascade Energy, we believe in better.” Source: RevenueBase Database · checked Sep 5, 2026
9	Energy And Environmental Economics, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	51-200	156 contacts →
	Indirect evidence “Energy.” Source: RevenueBase Database · checked Sep 5, 2026
10	STOK	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	51-200	141 contacts →
	Indirect evidence “Stok leads organizations to decarbonize now.” Source: RevenueBase Database · checked Sep 5, 2026
11	Michaels Energy- An Inc. 5000 Company	Partial evidence	La Crosse, WI, United StatesHQ checked Sep 5, 2026	51-200	121 contacts →
	Partial evidence “Michaels Energy is a veteran-owned energy consulting firm that exists to help businesses minimize waste and maximize value.” Source: RevenueBase Database · checked Sep 5, 2026
12	Cascadia Consulting Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	51-200	110 contacts →
	Partial evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 5, 2026
13	Ecoengineers	Partial evidence	Des Moines, IA, United StatesHQ checked Sep 5, 2026	51-200	109 contacts →
	Partial evidence “EcoEngineers, an LRQA company, is a consulting, auditing, and advisory firm with an exclusive focus on the energy transition and decarbonization.” Source: RevenueBase Database · checked Sep 5, 2026
14	KW Engineering	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 5, 2026	51-200	97 contacts →
	Indirect evidence “In 1998, I started kW Engineering as a two-person firm with a singular vision: to become the leading technical experts at saving money in buildings by saving energy and water.” Source: RevenueBase Database · checked Sep 5, 2026
15	Climeco	Indirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	51-200	96 contacts →
	Indirect evidence “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: RevenueBase Database · checked Sep 5, 2026
16	Verdani Partners	Partial evidence	Carlsbad, CA, United StatesHQ checked Sep 5, 2026	51-200	89 contacts →
	Partial evidence “Verdani Partners is a full service sustainability consulting firm specialized in corporate sustainability, LEED certification and greening and retrofitting existing buildings.” Source: RevenueBase Database · checked Sep 5, 2026
17	Group14 Engineering, PBC	Partial evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	11-50	75 contacts →
	Partial evidence “Group14 Engineering is a Denver-based consulting firm committed to inspiring better buildings where people thrive.” Source: RevenueBase Database · checked Sep 5, 2026
18	Baumann Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	51-200	63 contacts →
	Partial evidence “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Source: RevenueBase Database · checked Sep 5, 2026
19	Cognitud	Partial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	62 contacts →
	Partial evidence “Welcome to Cognitud, where purpose-driven consulting meets global impact.” Source: RevenueBase Database · checked Sep 5, 2026
20	Brightworks Sustainability	Indirect evidence	Portland, OR, United StatesHQ checked Sep 5, 2026	51-200	61 contacts →
	Indirect evidence “Recognized for advanced subject matter expertise, wide-ranging technical resources, creative problem-solving, and excellence in professional practice, Brightworks Sustainability…” Source: RevenueBase Database · checked Sep 5, 2026
21	Greengen	Indirect evidence	Bethesda, MD, United StatesHQ checked Sep 5, 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 5, 2026
22	Coho, An ERM Group Company	Indirect evidence	Bethesda, MD, United StatesHQ checked Sep 5, 2026	51-200	59 contacts →
	Indirect evidence “Coho, an ERM Group company, is a global climate adviser dedicated to helping clients navigate complexity and take ambitious steps on their climate journey.” Source: RevenueBase Database · checked Sep 5, 2026
23	Carbonbetter	Indirect evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	11-50	58 contacts →
	Indirect evidence “We believe that what’s good for our planet is good for business.” Source: RevenueBase Database · checked Sep 5, 2026
24	Partner Energy	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 5, 2026	51-200	57 contacts →
	Indirect evidence “Partner Energy, Inc.” Source: RevenueBase Database · checked Sep 5, 2026
25	Sinai Carbon Management	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	51-200	56 contacts →
	Indirect evidence “SINAI Technologies Inc.” Source: RevenueBase Database · checked Sep 5, 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: net zero consulting 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 net zero consulting firms.
Partial evidence: Its own public description names part of net zero consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name net zero consulting 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 747 net zero consulting firms based in the United States

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Net zero consulting firms based in the United States at a glance

As of Sep 5, 2026

48.7%Verified-email coverage

41.3%Mobile-number coverage

15.6Average contacts per company

1-10Median size (employees)

6.3%Largest-city concentration · New York

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

532

11-50

166

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

5,3050–30

32631–60

461–90

290–180

24180+

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 net zero consulting 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 “net zero consulting 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 net zero consulting 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 net zero consulting 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, 5,661 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 5, 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.

Net zero consulting 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 net zero consulting 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 net zero consulting firms are there based in the United States?

RevenueBase identified 747 net zero consulting 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?

Mckinstry, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most net zero consulting firms?

New York leads with 47 headquartered companies, followed by Chicago (29) and Los Angeles (24).

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 5,661 verified decision-maker contacts tracked across these 747 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 5, 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.