Company lists · Data refreshed September 2026

Top 25 Emissions reduction consulting firms based in the United States

Name: Emissions reduction 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 28, 2026 1,726 companies tracked

RevenueBase identified 1,726 company matches for emissions reduction consulting firms associated with the United States as of September 2026 and tracks 25,255 professional contacts across them, including 12,055 with verified work emails. New York is the largest hub.

This list covers company matches for emissions reduction consulting firms associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

1,726Companies

25,255Contacts tracked

12,055Verified emails

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The 25 largest emissions reduction consulting firms based in the United States

Ranked by team size

Top 25 of 1,726 company matches for emissions reduction consulting firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,213 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,121 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 28, 2026	n/a	1,145 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Sep 28, 2026	201-500	772 contacts →
	Exact match “Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Groundwater & Environmental Services, INC	Exact match	Wall Township, NJ, United StatesHQ recorded Sep 28, 2026	201-500	447 contacts →
	Exact match “We are Groundwater & Environmental Services, Inc, better known as GES.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	ROUX	Exact match	Islandia, NY, United StatesHQ recorded Sep 28, 2026	201-500	433 contacts →
	Exact match “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 28, 2026	201-500	383 contacts →
	Exact match “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 28, 2026	201-500	375 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Sep 28, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	3degrees Group, INC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 28, 2026	201-500	324 contacts →
	Exact match “3Degrees is a leading global climate solutions provider, pioneer of environmental markets, and Certified B Corporation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Sep 28, 2026	201-500	288 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Ecology And Environment, INC	Exact match	Lancaster, NY, United StatesHQ recorded Sep 28, 2026	5,001-10,000	278 contacts →
	Exact match “E&E is now WSP USA.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Sep 28, 2026	201-500	214 contacts →
	Exact match “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Dalkia Energy Solutions	Exact match	Beverly, MA, United StatesHQ recorded Sep 28, 2026	201-500	210 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Anew Climate	Exact match	Houston, TX, United StatesHQ recorded Sep 28, 2026	201-500	200 contacts →
	Exact match “Anew Climate is a global leader of diverse climate solutions, bringing innovative products and services to the public and private sectors to help reduce or offset their carbon…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Frontier Energy, INC	Exact match	Pleasanton, CA, United StatesHQ recorded Sep 28, 2026	51-200	192 contacts →
	Exact match “Frontier Energy is a professional services firm that excels in market transformation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Normandeau Associates, INC	Exact match	Bedford, NH, United StatesHQ recorded Sep 28, 2026	201-500	189 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Nexant	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 28, 2026	201-500	183 contacts →
	Exact match “Resource Innovations now combined with Nexant is a substantially woman-owned, woman-led energy consulting firm dedicated to creating equal access to clean resources through…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Terraphase Engineering INC	Exact match	Oakland, CA, United StatesHQ recorded Sep 28, 2026	201-500	166 contacts →
	Exact match “Terraphase offers cost-effective solutions to complex environmental and engineering challenges.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Bridger Photonics	Exact match	Bozeman, MT, United StatesHQ recorded Sep 28, 2026	51-200	164 contacts →
	Exact match “Bridger delivers trusted emissions intelligence that helps energy operators make faster, more confident decisions.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Industrial Economics, Incorporated IEC	Exact match	Cambridge, MA, United StatesHQ recorded Sep 28, 2026	51-200	163 contacts →
	Exact match “IEc is an environmental consulting firm with four decades of experience providing consulting services to a diverse client base.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Energy And Environmental Economics, INC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 28, 2026	51-200	156 contacts →
	Exact match “Energy.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Keramida INC	Exact match	Indianapolis, IN, United StatesHQ recorded Sep 28, 2026	51-200	152 contacts →
	Exact match “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Cleanair Engineering	Exact match	Palatine, IL, United StatesHQ recorded Sep 28, 2026	51-200	152 contacts →
	Exact match “Since its founding in 1972, CleanAir has an established reputation for excellence on projects of all sizes, ranging from boiler, APC equipment and cooling tower efficiency testing…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	STOK	Exact match	San Francisco, CA, United StatesHQ recorded Sep 28, 2026	51-200	141 contacts →
	Exact match “Stok leads organizations to decarbonize now.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “emissions reduction consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 1,726 emissions reduction consulting firms based in the United States

See the full list, filter by size, metro and specialty, and access 12,055 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Emissions reduction consulting firms based in the United States at a glance

As of Sep 28, 2026

47.7%Verified-email coverage

14.6Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,160

11-50

429

51-200

103

201-500

501-1,000

1,001-5,000

5,001-10,000

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 1,726 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “emissions reduction consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 12,055 professional contacts with verified work emails across the full matched dataset. 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 28, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Emissions reduction consulting firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “emissions reduction consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many emissions reduction consulting firms are there based in the United States?

RevenueBase identified 1,726 company matches for emissions reduction consulting firms associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Mckinstry tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most emissions reduction consulting firms?

New York leads with 83 company records, followed by Houston (64) and Chicago (42).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 12,055 professional contacts with verified work emails tracked across these 1,726 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 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 SmartSearch, 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.