Company lists · Data refreshed September 2026

Top 25 Renewable energy consultancy companies based in the United States

Name: Renewable energy consultancy 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 5, 2026 2,669 companies tracked

RevenueBase identified 2,669 company matches for renewable energy consultancy companies associated with the United States as of September 2026 and tracks 39,672 professional contacts across them, including 17,714 with verified work emails and 16,928 with mobile numbers. Houston is the largest hub.

This list covers company matches for renewable energy consultancy companies 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 5, 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 5, 2026 How this list was built

2,669Companies

39,672Contacts tracked

17,714Verified emails

16,928Mobile numbers

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The 25 largest renewable energy consultancy companies based in the United States

Ranked by team size

Top 25 of 2,669 company matches for renewable energy consultancy companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 5, 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	FTI	Exact match	Menasha, WI, United StatesHQ recorded Sep 5, 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 5, 2026 · View company records in RevenueBase
2	Westwood Professional Services	Exact match	Plano, TX, United StatesHQ recorded Sep 5, 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 5, 2026 · View company records in RevenueBase
3	Partner Engineering & Science, INC	Exact match	Torrance, CA, United StatesHQ recorded Sep 5, 2026	1,001-5,000	1,358 contacts →
	Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
4	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 5, 2026	1,001-5,000	1,088 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
5	Wanzek Construction, Inc., A Mastec Company	Exact match	Fargo, ND, United StatesHQ recorded Sep 5, 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 5, 2026 · View company records in RevenueBase
6	Willdan	Exact match	Anaheim, CA, United StatesHQ recorded Sep 5, 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 5, 2026 · View company records in RevenueBase
7	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 5, 2026	501-1,000	733 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
8	Synergy Consulting, INC	Exact match	Washington, DC, United StatesHQ recorded Sep 5, 2026	51-200	434 contacts →
	Exact match “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
9	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 5, 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 5, 2026 · View company records in RevenueBase
10	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 5, 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 5, 2026 · View company records in RevenueBase
11	Takkion	Exact match	Evansville, WY, United StatesHQ recorded Sep 5, 2026	1,001-5,000	358 contacts →
	Exact match “TAKKION is Moving Energy Forward.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
12	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Sep 5, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
13	NEI Electric Power Engineering, INC	Exact match	Lakewood, CO, United StatesHQ recorded Sep 5, 2026	201-500	318 contacts →
	Exact match “NEI provides professional expertise and design engineering services for all aspects of power systems engineering.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
14	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 5, 2026	201-500	305 contacts →
	Exact match “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
15	Commonwealth Associates, INC	Exact match	Jackson, MI, United StatesHQ recorded Sep 5, 2026	201-500	305 contacts →
	Exact match “We provide expert engineering and consulting services that enable a more reliable and resilient power system.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
16	Csrs, A Westwood Company	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 5, 2026	51-200	305 contacts →
	Exact match “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
17	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Sep 5, 2026	201-500	288 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
18	Lake Superior Consulting	Exact match	Duluth, MN, United StatesHQ recorded Sep 5, 2026	201-500	281 contacts →
	Exact match “We act as an extension of your team, combining deep energy expertise with seamless alignment to your processes to advance projects with confidence.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
19	Illumine-I	Exact match	Austin, CA, United StatesHQ recorded Sep 5, 2026	201-500	275 contacts →
	Exact match “The world runs on power.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
20	CON Edison Clean Energy Businesses	Exact match	Valhalla, NY, United StatesHQ recorded Sep 5, 2026	201-500	268 contacts →
	Exact match “Con Edison Clean Energy Businesses, Inc.(Con Edison CEB) is a leader in the renewable energy industry.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
21	Merjent	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 5, 2026	201-500	264 contacts →
	Exact match “Merjent is an environmental, restoration, and engineering consulting firm with a long history serving the energy industry.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
22	Nova Group, GBC	Exact match	St. Louis Park, MN, United StatesHQ recorded Sep 5, 2026	201-500	264 contacts →
	Exact match “Nova Group, GBC is an international, multidisciplinary advising firm providing environmental, engineering and energy services throughout North America and around the globe.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
23	PSC Consulting	Exact match	Kirkland, WA, United StatesHQ recorded Sep 5, 2026	201-500	254 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 · Sep 5, 2026 · View company records in RevenueBase
24	Baywa R.E. Americas	Exact match	Carlsbad, CA, United StatesHQ recorded Sep 5, 2026	201-500	244 contacts →
	Exact match “rethinkenergy BayWa r.e is a leading global renewable energy company committed to delivering best-in-class projects, services and solutions.” Recorded in the RevenueBase company graph · Sep 5, 2026 · View company records in RevenueBase
25	Kleinschmidt Associates	Exact match	Pittsfield, ME, United StatesHQ recorded Sep 5, 2026	201-500	218 contacts →
	Exact match “At Kleinschmidt, we work primarily with energy companies and government agencies in North America to protect and enhance the environment without compromising performance.” Recorded in the RevenueBase company graph · Sep 5, 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 “renewable energy consultancy companies”. 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 2,669 renewable energy consultancy companies based in the United States

See the full list, filter by size, metro and specialty, and access 17,714 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Renewable energy consultancy companies based in the United States at a glance

As of Sep 5, 2026

44.7%Verified-email coverage

42.7%Mobile-number coverage

14.9Average contacts per company

1-10Median size (employees)

4.3%Largest-city concentration · Houston

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

1,563

11-50

779

51-200

233

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

16,5840–30

1,05531–60

461–90

990–180

62180+

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 “renewable energy consultancy companies” 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 17,714 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 5, 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.

Renewable energy consultancy companies 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 “renewable energy consultancy companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many renewable energy consultancy companies are there based in the United States?

RevenueBase identified 2,669 company matches for renewable energy consultancy companies 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?

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

Which city has the most renewable energy consultancy companies?

Houston leads with 115 company records, followed by New York (90) and Denver (53).

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 17,714 professional contacts with verified work emails tracked across these 2,669 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 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 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.