Company lists · Data refreshed September 2026

Top 25 Energy efficiency auditors based in the United States

Name: Energy efficiency auditors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 438 companies tracked

RevenueBase identified 438 energy efficiency auditors headquartered in the United States as of September 2026 and tracks 4,047 professional contacts across them, including 1,493 with verified work emails. New York is the largest hub.

This list covers energy efficiency auditors 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 16, 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 16, 2026 86% judged on-target in blind review

438Companies

4,047Contacts tracked

1,493Verified emails

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The 25 largest energy efficiency auditors based in the United States

Ranked by team size

Top 25 of 438 energy efficiency auditors based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to energy efficiency auditors: 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	Cascade Energy	Partial evidence	Portland, OR, United StatesHQ checked Sep 16, 2026	201-500	288 contacts →
	Partial evidence “At Cascade Energy, we believe in better.” Source: RevenueBase Database · checked Sep 16, 2026
2	PEG	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 16, 2026	201-500	214 contacts →
	Partial evidence “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Source: RevenueBase Database · checked Sep 16, 2026
3	Dalkia Energy Solutions	Strong evidence	Beverly, MA, United StatesHQ checked Sep 16, 2026	201-500	210 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026
4	Willdan Performance Engineering	Partial evidence	Denver, KS, United StatesHQ checked Sep 16, 2026	51-200	129 contacts →
	Partial evidence “Willdan Performance Engineering specializes in energy and infrastructure improvement projects through design-build and performance contracting.” Source: RevenueBase Database · checked Sep 16, 2026
5	Michaels Energy- An Inc. 5000 Company	Partial evidence	La Crosse, WI, United StatesHQ checked Sep 16, 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 16, 2026
6	PSD	Strong evidence	Ithaca, NY, United StatesHQ checked Sep 16, 2026	51-200	112 contacts →
	Strong evidence “PSD is an energy efficiency services and technology company.” Source: RevenueBase Database · checked Sep 16, 2026
7	Magrann Associates	Strong evidence	Mount Laurel, NJ, United StatesHQ checked Sep 16, 2026	51-200	81 contacts →
	Strong evidence “MaGrann Associates is an innovative energy efficiency and green building consulting and engineering firm headquartered in Mount Laurel, New Jersey with additional offices in…” Source: RevenueBase Database · checked Sep 16, 2026
8	Energy 350, INC	Strong evidence	Portland, OR, United StatesHQ checked Sep 16, 2026	51-200	60 contacts →
	Strong evidence “Energy 350 takes pride in performing high quality energy studies and energy efficiency related services for end users as well as program administrators.” Source: RevenueBase Database · checked Sep 16, 2026
9	Sustainable Investment Group SIG	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 16, 2026	11-50	52 contacts →
	Indirect evidence “Sustainable Investment Group, LLC (SIG) is a full-service sustainable building consulting firm that provides environmentally focused solutions to design, construction, and real…” Source: RevenueBase Database · checked Sep 16, 2026
10	Altura	Partial evidence	Newport Beach, CA, United StatesHQ checked Sep 16, 2026	51-200	47 contacts →
	Partial evidence “Altura is a new breed of engineering consulting firm, delivering everything it takes to guide owners to realizing climate and carbon goals by improving energy, environmental, and…” Source: RevenueBase Database · checked Sep 16, 2026
11	Brower Mechanical	Partial evidence	Rocklin, CA, United StatesHQ checked Sep 16, 2026	51-200	44 contacts →
	Partial evidence “We provide energy solutions for homes and businesses.” Source: RevenueBase Database · checked Sep 16, 2026
12	Commercial Green Solutions	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 16, 2026	51-200	43 contacts →
	Partial evidence “Commercial Green Solutions** is a long-established and respected Energy Consultant dedicated to helping clients: Dramatically reduce energy usage Lower energy spend Improve…” Source: RevenueBase Database · checked Sep 16, 2026
13	BEE	Strong evidence	Austin, TX, United StatesHQ checked Sep 16, 2026	11-50	41 contacts →
	Strong evidence “Bee® (Building energy efficiency) is a building and facility energy engineering firm.” Source: RevenueBase Database · checked Sep 16, 2026
14	Us-Eco Logic Texenergy Solutions	Strong evidence	Irving, TX, United StatesHQ checked Sep 16, 2026	51-200	40 contacts →
	Strong evidence “US-Eco Logic / TexEnergy Solutions is a consulting firm offering services that assist developments looking to become certified as “green” and/or “energy efficient”.” Source: RevenueBase Database · checked Sep 16, 2026
15	Energy Solutions Direct	Strong evidence	Clearwater, FL, United StatesHQ checked Sep 16, 2026	11-50	38 contacts →
	Strong evidence “Evaluating immediate and long-term solutions needed to make your home more energy efficient will save you significant money over time.” Source: RevenueBase Database · checked Sep 16, 2026
16	Power Of Clean Energy	Partial evidence	Nashville, TN, United StatesHQ checked Sep 16, 2026	11-50	37 contacts →
	Partial evidence “Power of Clean Energy (PCE), A Fidelity Company, helps commercial & industrial facilities meet their ESG sustainability goals while reducing energy consumption, expenses, and…” Source: RevenueBase Database · checked Sep 16, 2026
17	Zero Energy Contracting	Partial evidence	Cerritos, CA, United StatesHQ checked Sep 16, 2026	51-200	37 contacts →
	Partial evidence “Saving energy not only saves you money, but it also helps protect our planet's resources for generations to come.” Source: RevenueBase Database · checked Sep 16, 2026
18	Nv5 NET Zero	Strong evidence	Hollywood, FL, United StatesHQ checked Sep 16, 2026	11-50	34 contacts →
	Strong evidence “NV5 Net Zero is a leading global energy efficiency consultancy.” Source: RevenueBase Database · checked Sep 16, 2026
19	Tacoma Energy	Strong evidence	Westerville, IN, United StatesHQ checked Sep 16, 2026	51-200	32 contacts →
	Strong evidence “Tacoma Energy® is a nationally recognized leader in residential energy efficiency.” Source: RevenueBase Database · checked Sep 16, 2026
20	Dr. Energy Saver	Indirect evidence	Seymour, CT, United StatesHQ checked Sep 16, 2026	11-50	32 contacts →
	Indirect evidence “Dr.” Source: RevenueBase Database · checked Sep 16, 2026
21	Tri-State Energy	Strong evidence	New Brunswick, NJ, United StatesHQ checked Sep 16, 2026	11-50	31 contacts →
	Strong evidence “Tri-State Energy (formerly Tri-State Light & Energy) is an engineering firm with over 40 years of experience specializing in energy efficiency consulting and implementation…” Source: RevenueBase Database · checked Sep 16, 2026
22	Vert Energy Group	Strong evidence	Orange, CA, United StatesHQ checked Sep 16, 2026	11-50	30 contacts →
	Strong evidence “Vert Energy Group is a full-service energy efficiency and engineering company that helps building owners and property managers complete Energy Benchmark Compliance, Energy Audits…” Source: RevenueBase Database · checked Sep 16, 2026
23	National Retrofitting Group, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 16, 2026	11-50	30 contacts →
	Partial evidence “National Retrofitting Group provides sustainability consulting along with a variety of energy retrofitting services to help our customers save money on their energy bills while…” Source: RevenueBase Database · checked Sep 16, 2026
24	Abraxas Energy Consulting	Partial evidence	Atascadero, CA, United StatesHQ checked Sep 16, 2026	201-500	29 contacts →
	Partial evidence “In 2024, Abraxas Energy Consulting became a member of the Hillmann Family of Companies.” Source: RevenueBase Database · checked Sep 16, 2026
25	Contemporary Energy Solutions LLC	Partial evidence	Manitowoc, WI, United StatesHQ checked Sep 16, 2026	11-50	27 contacts →
	Partial evidence “Contemporary Energy Solutions is known for helping clients eliminate waste from their operations and improve their bottom line.” Source: RevenueBase Database · checked Sep 16, 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: energy efficiency auditors. 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 energy efficiency auditors.
Partial evidence: Its own public description names part of energy efficiency auditors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy efficiency auditors. 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 438 energy efficiency auditors based in the United States

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Energy efficiency auditors based in the United States at a glance

As of Sep 16, 2026

36.9%Verified-email coverage

9.2Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

263

11-50

136

51-200

201-500

501-1,000

1,001-5,000

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 438 companies.

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 energy efficiency auditors, 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 “energy efficiency auditors”. 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 energy efficiency auditors), 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 energy efficiency auditors, 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, 1,493 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 16, 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.

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 energy efficiency auditors, 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 energy efficiency auditors are there based in the United States?

RevenueBase identified 438 energy efficiency auditors 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?

Cascade Energy, headquartered in Portland, tops this list with the largest team on record.

Which city has the most energy efficiency auditors?

New York leads with 10 headquartered companies, followed by Chicago (8) and Austin (7).

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 1,493 verified decision-maker contacts tracked across these 438 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 16, 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.