Company lists · Data refreshed October 2026

Top 25 Clean energy transition advisors based in the United States

RevenueBase identified 1,023 company matches for clean energy transition advisors associated with the United States as of October 2026 and tracks 13,498 professional contacts across them, including 5,862 with verified work emails. New York is the largest hub.

This list covers company matches for clean energy transition advisors 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 October 9, 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 Oct 9, 2026 How this list was built
1,023Companies
13,498Contacts tracked
5,862Verified emails
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The 25 largest clean energy transition advisors based in the United States

Ranked by team size
Top 25 of 1,023 company matches for clean energy transition advisors based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 9, 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchAustin, TX, United StatesHQ recorded Oct 9, 20261,001-5,0002,206 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 · Oct 9, 2026 · View company records in RevenueBase
2Exact matchAustin, TX, United StatesHQ recorded Oct 9, 2026n/a1,150 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 · Oct 9, 2026 · View company records in RevenueBase
3Exact matchHalf Moon Bay, CA, United StatesHQ recorded Oct 9, 2026501-1,000774 contacts →

Exact match

“Resource Innovations (RI) is an energy transformation firm.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4Exact matchIrvine, CA, United StatesHQ recorded Oct 9, 2026201-500387 contacts →

Exact match

“We are Trio – global energy and sustainability advisors.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5Exact matchPark Ridge, NJ, United StatesHQ recorded Oct 9, 2026201-500360 contacts →

Exact match

“National Utility Service, Inc.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
6Exact matchSan Francisco, CA, United StatesHQ recorded Oct 9, 2026201-500309 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 · Oct 9, 2026 · View company records in RevenueBase
7Exact matchPortland, OR, United StatesHQ recorded Oct 9, 2026201-500301 contacts →

Exact match

“At Cascade Energy, we believe in better.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
8Exact matchKirkland, WA, United StatesHQ recorded Oct 9, 2026201-500281 contacts →

Exact match

“We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
9Exact matchFairfax, VA, United StatesHQ recorded Oct 9, 2026201-500216 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 · Oct 9, 2026 · View company records in RevenueBase
10Exact matchPleasanton, CA, United StatesHQ recorded Oct 9, 202651-200213 contacts →

Exact match

“Frontier Energy is a professional services firm that excels in market transformation.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11Exact matchBeverly, MA, United StatesHQ recorded Oct 9, 2026201-500213 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 · Oct 9, 2026 · View company records in RevenueBase
12Exact matchBend, OR, United StatesHQ recorded Oct 9, 2026201-500196 contacts →

Exact match

“Lindahl Reed empowers tomorrow by inspiring change and shaping a better future.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13Exact matchBoston, MA, United StatesHQ recorded Oct 9, 202651-200178 contacts →

Exact match

“CATF advocates for the change in technologies and policies needed to get to a zero-emissions, high-energy planet at an affordable cost.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
14Exact matchSan Francisco, CA, United StatesHQ recorded Oct 9, 202651-200163 contacts →

Exact match

“Energy.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
15Exact matchChicago, IL, United StatesHQ recorded Oct 9, 202651-200161 contacts →

Exact match

“Marathon Capital is the largest independent investment bank dedicated to servicing the clean economy.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16Exact matchSan Francisco, CA, United StatesHQ recorded Oct 9, 202651-200153 contacts →

Exact match

“Stok leads organizations to decarbonize now.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17Exact matchNew York, NY, United StatesHQ recorded Oct 9, 202651-200118 contacts →

Exact match

“Environ Energy is a leader in accelerating global sustainable energy transformation for more than 30 years.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18Exact matchSeattle, WA, United StatesHQ recorded Oct 9, 202651-200108 contacts →

Exact match

“Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19Exact matchDes Moines, IA, United StatesHQ recorded Oct 9, 202651-20098 contacts →

Exact match

“EcoEngineers, an LRQA company, is a consulting, auditing, and advisory firm with an exclusive focus on the energy transition and decarbonization.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20Exact matchNew York, NY, United StatesHQ recorded Oct 9, 202611-5097 contacts →

Exact match

“At OnePointFive we solve your sustainability focused business challenges by empowering your organization with expert-led solutions, embedded training, and cutting edge tools to…”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21Exact matchHouston, TX, United StatesHQ recorded Oct 9, 202651-20092 contacts →

Exact match

“ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22Exact matchValley City, OH, United StatesHQ recorded Oct 9, 202651-20081 contacts →

Exact match

“The Institute for Energy Economics and Financial Analysis (IEEFA) is a global think tank examining issues related to energy markets, trends, and policies.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23Exact matchDenver, CO, United StatesHQ recorded Oct 9, 202611-5077 contacts →

Exact match

“Group14 Engineering is a Denver-based consulting firm committed to inspiring better buildings where people thrive.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
24Exact matchNew York, NY, United StatesHQ recorded Oct 9, 202611-5066 contacts →

Exact match

“CRC-IB is a full-service investment bank providing industry-leading financial services across the energy transition.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
25Exact matchBethesda, MD, United StatesHQ recorded Oct 9, 202611-5061 contacts →

Exact match

“GreenGen is a global leader in energy and sustainability solutions, empowering organizations to Operate in the Green®.”

Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase

Showing 25 of 1,023 clean energy transition advisors based in the United States

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Clean energy transition advisors based in the United States at a glance

As of Oct 9, 2026
43.4%Verified-email coverage
13.2Average contacts per company
1-10Median size (employees)
6.8%Largest-city concentration · New York
Oct 9, 2026Page data refreshed

Companies by employee count

1-10
730
11-50
230
51-200
40
201-500
13
501-1,000
3
1,001-5,000
5
10001+
1

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 1,023 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 “clean energy transition advisors” 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 5,862 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 October 9, 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.

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 “clean energy transition advisors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many clean energy transition advisors are there based in the United States?

RevenueBase identified 1,023 company matches for clean energy transition advisors associated with the United States as of October 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?

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

Which city has the most clean energy transition advisors?

New York leads with 70 company records, followed by Washington (51) and Houston (46).

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 5,862 professional contacts with verified work emails tracked across these 1,023 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 October 9, 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.