Company lists · Data refreshed September 2026

Top 25 Sustainable energy consultants based in the United States

Name: Sustainable energy consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 4,153 companies tracked

RevenueBase identified 4,153 company matches for sustainable energy consultants associated with the United States as of September 2026 and tracks 75,231 professional contacts across them, including 30,916 with verified work emails. Houston is the largest hub.

This list covers company matches for sustainable energy consultants 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 18, 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 18, 2026 How this list was built

4,153Companies

75,231Contacts tracked

30,916Verified emails

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The 25 largest sustainable energy consultants based in the United States

Ranked by team size

Top 25 of 4,153 company matches for sustainable energy consultants based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 18, 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	Sargent & Lundy	Exact match	Chicago, WY, United StatesHQ recorded Sep 18, 2026	1,001-5,000	4,156 contacts →
	Exact match “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
2	Generac	Exact match	Waukesha, WI, United StatesHQ recorded Sep 18, 2026	5,001-10,000	3,797 contacts →
	Exact match “Generac is the total energy solutions company powering a smarter world.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
3	FTI	Exact match	Menasha, WI, United StatesHQ recorded Sep 18, 2026	1,001-5,000	2,741 contacts →
	Exact match “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
4	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Sep 18, 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 18, 2026 · View company records in RevenueBase
5	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Sep 18, 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 18, 2026 · View company records in RevenueBase
6	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Sep 18, 2026	1,001-5,000	1,661 contacts →
	Exact match “At Westwood, our purpose is to create a better world for people through our work.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
7	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Sep 18, 2026	1,001-5,000	1,383 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
8	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 18, 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 18, 2026 · View company records in RevenueBase
9	Wanzek Construction, Inc., A Mastec Company	Exact match	Fargo, ND, United StatesHQ recorded Sep 18, 2026	1,001-5,000	933 contacts →
	Exact match “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
10	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Sep 18, 2026	1,001-5,000	851 contacts →
	Exact match “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
11	Energy Solutions	Exact match	Oakland, CA, United StatesHQ recorded Sep 18, 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 18, 2026 · View company records in RevenueBase
12	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 18, 2026	501-1,000	733 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
13	SEL Construction Corporation	Exact match	Loomis, CA, United StatesHQ recorded Sep 18, 2026	n/a	722 contacts →
	Exact match “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
14	Depcom Power, INC	Exact match	Scottsdale, AZ, United StatesHQ recorded Sep 18, 2026	1,001-5,000	624 contacts →
	Exact match “DEPCOM Power, a Koch Engineered Solutions Company, is a leading solar energy solutions partner providing Development Support, Engineering, Procurement & Construction (EPC)…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
15	Noresco	Exact match	Westborough, MA, United StatesHQ recorded Sep 18, 2026	201-500	481 contacts →
	Exact match “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
16	Babcock Power	Exact match	Danvers, MA, United StatesHQ recorded Sep 18, 2026	501-1,000	476 contacts →
	Exact match “Finding a single capable partner to support both large- and small-scale power generation needs can be challenging.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
17	Dupont Water Solutions	Exact match	Wilmington, DE, United StatesHQ recorded Sep 18, 2026	10001+	470 contacts →
	Exact match “We’re helping companies in every industry, in every corner of the globe make real progress.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
18	Synergy Consulting, INC	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	51-200	434 contacts →
	Exact match “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
19	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 18, 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 18, 2026 · View company records in RevenueBase
20	Energyscape Renewables	Exact match	Denver, United StatesHQ recorded Sep 18, 2026	501-1,000	379 contacts →
	Exact match “Established in 2019.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
21	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 18, 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 18, 2026 · View company records in RevenueBase
22	Takkion	Exact match	Evansville, WY, United StatesHQ recorded Sep 18, 2026	1,001-5,000	358 contacts →
	Exact match “TAKKION is Moving Energy Forward.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
23	Wendel Companies	Exact match	Williamsville, NY, United StatesHQ recorded Sep 18, 2026	201-500	355 contacts →
	Exact match “Wendel is an Architecture, Engineering, Energy Efficiency, and Construction Management Firm that delivers customized solutions and turnkey projects in innovative ways.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
24	PCI Energy Solutions	Exact match	Norman, OK, United StatesHQ recorded Sep 18, 2026	201-500	346 contacts →
	Exact match “PCIEnergySolutions is a tight-knit team of 300 diligent product experts, engineers, business analysts, and more.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
25	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Sep 18, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Sep 18, 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 “sustainable energy consultants”. 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 4,153 sustainable energy consultants based in the United States

See the full list, filter by size, metro and specialty, and access 30,916 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainable energy consultants based in the United States at a glance

As of Sep 18, 2026

41.1%Verified-email coverage

18.1Average contacts per company

1-10Median size (employees)

4.2%Largest-city concentration · Houston

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

2,239

11-50

1,336

51-200

412

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 4,153 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 “sustainable energy consultants” 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 30,916 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 18, 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.

Sustainable energy consultants 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 “sustainable energy consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable energy consultants are there based in the United States?

RevenueBase identified 4,153 company matches for sustainable energy consultants 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?

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

Which city has the most sustainable energy consultants?

Houston leads with 174 company records, followed by New York (144) and Chicago (73).

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 30,916 professional contacts with verified work emails tracked across these 4,153 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 18, 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.