Company lists · Data refreshed October 2026

Top 25 Energy efficiency nonprofits based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 1,089 companies tracked

RevenueBase identified 1,089 company matches for energy efficiency nonprofits associated with the United States as of October 2026 and tracks 19,543 professional contacts across them, including 7,026 with verified work emails. New York is the largest hub.

This list covers company matches for energy efficiency nonprofits 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 12, 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 12, 2026 How this list was built

1,089Companies

19,543Contacts tracked

7,026Verified emails

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The 25 largest energy efficiency nonprofits based in the United States

Ranked by team size

Top 25 of 1,089 company matches for energy efficiency nonprofits based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 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	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,206 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 12, 2026 · View company records in RevenueBase
2	Powur, PBC	Exact match	San Diego, United StatesHQ recorded Oct 12, 2026	n/a	1,097 contacts →
	Exact match “The Powur Mission: Accelerate the adoption of clean energy worldwide We're empowering our community of homeowners and advisors to thrive in the global shift to sustainable energy.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
3	Consortium For Energy Efficiency	Exact match	Middleton, MA, United StatesHQ recorded Oct 12, 2026	n/a	485 contacts →
	Exact match “Please visit our careers page, for positions at CEE and CEE member organizations.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
4	Posigen	Exact match	St. Rose, LA, United StatesHQ recorded Oct 12, 2026	501-1,000	433 contacts →
	Exact match “PosiGen is the nation's leading residential solar and energy efficiency provider.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
5	Homeworks Energy, INC	Exact match	Medford, MA, United StatesHQ recorded Oct 12, 2026	201-500	369 contacts →
	Exact match “At HomeWorks Energy, our mission is simple, literally: Energy Efficiency, Simplified.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
6	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Oct 12, 2026	201-500	301 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
7	Energy Trust Of Oregon	Exact match	Portland, OR, United StatesHQ recorded Oct 12, 2026	51-200	265 contacts →
	Exact match “Energy Trust of Oregon is an independent nonprofit organization dedicated to helping utility customers benefit from saving energy and generating renewable power.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	CMC Energy Services	Exact match	Fort Washington, PA, United StatesHQ recorded Oct 12, 2026	201-500	261 contacts →
	Exact match “CMC Energy Services is a woman-owned full-service energy efficiency company with nearly 50 years of experience delivering value-based energy conservation services.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
9	Lime Energy	Exact match	Newark, NJ, United StatesHQ recorded Oct 12, 2026	201-500	248 contacts →
	Exact match “Lime Energy is building a new energy future.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Walker-Miller Energy Services	Exact match	Detroit, MI, United StatesHQ recorded Oct 12, 2026	51-200	222 contacts →
	Exact match “Walker-Miller Energy Services (Walker-Miller), one of the largest African American and woman owned energy efficiency companies in the United States, changes lives through energy.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	Center For Energy And Environment	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 12, 2026	51-200	220 contacts →
	Exact match “CEE is a community-based clean energy nonprofit with special expertise in energy efficiency that stretches back 40 years.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	Richard Heath & Associates, Inc. RHA	Exact match	Fresno, CA, United StatesHQ recorded Oct 12, 2026	501-1,000	217 contacts →
	Exact match “Now part of Resource Innovations, RHA will expand its team to over 1,100 professionals, broadening expertise and offering clients additional solutions in energy storage and…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	Dalkia Energy Solutions	Exact match	Beverly, MA, United StatesHQ recorded Oct 12, 2026	201-500	213 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 12, 2026 · View company records in RevenueBase
14	Bright Power	Exact match	New York, NY, United StatesHQ recorded Oct 12, 2026	51-200	201 contacts →
	Exact match “Bright Power is a leading provider of energy efficiency and decarbonization solutions for the real estate industry.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Ever-Green Energy	Exact match	St. Paul, MN, United StatesHQ recorded Oct 12, 2026	201-500	193 contacts →
	Exact match “Ever-Green Energy is a recognized leader in energy conservation and the use of renewable energy.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
16	Gridpoint	Exact match	Reston, VA, United StatesHQ recorded Oct 12, 2026	201-500	187 contacts →
	Exact match “GridPoint redefines energy optimization by connecting businesses, buildings, and the grid to make companies more efficient, energy grids more reliable, and create a more…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
17	Infinity Solar USA	Exact match	Vancouver, WA, United StatesHQ recorded Oct 12, 2026	51-200	184 contacts →
	Exact match “Preserve, protect, and improve the environment in the US with Solar.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
18	U.S. Energy Foundation	Exact match	San Francisco, CA, United StatesHQ recorded Oct 12, 2026	51-200	150 contacts →
	Exact match “U.S.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
19	Slipstream	Exact match	Madison, WI, United StatesHQ recorded Oct 12, 2026	51-200	146 contacts →
	Exact match “We're a nonprofit headquartered in Madison, WI with an office in Chicago and remote staff across the U.S.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
20	Ecology Action	Exact match	Santa Cruz, CA, United StatesHQ recorded Oct 12, 2026	51-200	146 contacts →
	Exact match “Ecology Action is an award-winning California 501(c)(3) non-profit that’s been inspiring sustainable community actions since 1970.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	NEW Energy Nexus	Exact match	Berkeley, CA, United StatesHQ recorded Oct 12, 2026	51-200	140 contacts →
	Exact match “New Energy Nexus (NEX) is the world's leading ecosystem of funds and accelerators supporting diverse clean energy entrepreneurs to thrive, from emerging tech through to clean…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
22	The Energy Coalition	Exact match	Los Angeles, CA, United StatesHQ recorded Oct 12, 2026	51-200	134 contacts →
	Exact match “The Energy Coalition (TEC) is a California-based nonprofit 501(c)3 organization.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
23	Melink Corporation	Exact match	Milford, OH, United StatesHQ recorded Oct 12, 2026	51-200	131 contacts →
	Exact match “We are a global provider of energy efficiency solutions for commercial buildings with five business offerings: HVAC Testing, Adjusting & Balancing, Intelli-Hood® Kitchen…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
24	Synergy Companies	Exact match	Fresno, CA, United StatesHQ recorded Oct 12, 2026	501-1,000	129 contacts →
	Exact match “Synergy Companies is the largest energy services companies in California and provides a comprehensive approach to energy efficiency and environmental solutions in both the…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
25	Evergreen Energy Partners	Exact match	Portland, OR, United StatesHQ recorded Oct 12, 2026	51-200	125 contacts →
	Exact match “As a team at Evergreen Energy Partners, we specialize in connecting utility customers with expert knowledge and innovative solutions for commercial, industrial, and residential…” Recorded in the RevenueBase company graph · Oct 12, 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 “energy efficiency nonprofits”. 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 1,089 energy efficiency nonprofits based in the United States

See the full list, filter by size, metro and specialty, and access 7,026 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Energy efficiency nonprofits based in the United States at a glance

As of Oct 12, 2026

36.0%Verified-email coverage

17.9Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · New York

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

575

11-50

373

51-200

108

201-500

501-1,000

1,001-5,000

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 1,089 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 “energy efficiency nonprofits” 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 7,026 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 12, 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.

Energy efficiency nonprofits by metro

Energy efficiency nonprofits in New York30

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

How many energy efficiency nonprofits are there based in the United States?

RevenueBase identified 1,089 company matches for energy efficiency nonprofits 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 energy efficiency nonprofits?

New York leads with 30 company records, followed by Washington (23) and Portland (19).

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 7,026 professional contacts with verified work emails tracked across these 1,089 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 12, 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.