Company lists · Data refreshed October 2026

Top 25 Clean energy nonprofits based in Washington, United States

Name: Clean energy nonprofits based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 9, 2026 61 companies tracked

RevenueBase identified 61 company matches for clean energy nonprofits associated with Washington, United States as of October 2026 and tracks 2,228 professional contacts across them, including 780 with verified work emails. Across the United States, New York is the largest hub for this category (61 companies); Washington follows with 61.

This list covers company matches for clean energy nonprofits associated with Washington, 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

61Companies

2,228Contacts tracked

780Verified emails

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The 25 largest clean energy nonprofits based in Washington, United States

Ranked by team size

Top 25 of 61 company matches for clean energy nonprofits based in Washington, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	American Clean Power Association ACP	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	221 contacts →
	Exact match “The American Clean Power Association (ACP) is the leading voice of today’s multi-tech clean energy industry, representing energy storage, wind, utility-scale solar, clean…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
2	SOL Systems	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	192 contacts →
	Exact match “Sol Systems is a national clean energy firm focused on building domestic energy that benefits local communities.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
3	Cleanchoice Energy	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	147 contacts →
	Exact match “CleanChoice Energy is a cleantech company that empowers people and businesses to easily access climate solutions.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4	Solar United Neighbors	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	123 contacts →
	Exact match “Solar United Neighbors (SUN) is a national nonprofit organization helping people go solar, join together, and fight for their energy rights.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5	Smart Electric Power Alliance	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	103 contacts →
	Exact match “The Smart Electric Power Alliance (SEPA) is a 501(c)(3) nonprofit accelerating the transition to a clean, affordable, and resilient energy system for all.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
6	The American Council For An Energy-Efficient Economy Aceee	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	91 contacts →
	Exact match “The American Council for an Energy-Efficient Economy a nonprofit research organization, develops policies to reduce energy waste and combat climate change.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	Center For Climate And Energy Solutions C2es	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	68 contacts →
	Exact match “The Center for Climate and Energy Solutions (C2ES) is an independent, nonpartisan, nonprofit organization working to forge practical solutions to climate change.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
8	Clearpath	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	66 contacts →
	Exact match “ClearPath’s mission is to accelerate American innovation to reduce global energy emissions.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
9	Groundswell, INC	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	44 contacts →
	Exact match “Groundswell builds community power to strengthen local resilience for everyone and cut electricity bills in half for our neighbors who need savings the most.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
10	Alliance To Save Energy	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	44 contacts →
	Exact match “The Alliance to Save Energy provides access to the most influential coalition of bipartisan government, agency, and business leaders in energy efficiency.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11	Evergreen Action	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	35 contacts →
	Exact match “We're advancing an all-out national mobilization to defeat the climate crisis and create millions of jobs in a just, thriving, and inclusive clean energy economy.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
12	Environmental And Energy Study Institute Eesi	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	32 contacts →
	Exact match “The Environmental and Energy Study Institute (EESI) is a nonprofit organization established in 1984 by a bipartisan Congressional caucus to provide timely, credible information…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13	EFI Foundation	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	22 contacts →
	Exact match “The EFI Foundation is an independent, nonpartisan leader tackling the toughest energy challenges of our time.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
14	Zoetic Global	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	18 contacts →
	Exact match “At Zoetic Global, our mission is to revolutionize the energy sector through innovative solutions that unleash the power of renewable resources.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
15	Pioneer Public Affairs	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	1-10	18 contacts →
	Exact match “We seek to support emerging, game-changing clean energy technologies and advocacy movements to combat the climate crisis, protect our natural wonders, and empower marginalized…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	Invest In OUR Future	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	1-10	16 contacts →
	Exact match “Invest in Our Future supports philanthropic organizations to mobilize funds to ensure that unprecedented federal clean energy investments strengthen communities across the…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17	Ipsun Solar	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	16 contacts →
	Exact match “Ipsun Solar, a Civic Renewables Company, is a leader in clean energy services based in Virginia, Washington D.C.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	Renewable Energy Wildlife Institute Rewi	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	15 contacts →
	Exact match “The Renewable Energy Wildlife Institute (REWI) is an independent 501(c)3 organization that develops and leverages scientific research around renewable energy interactions with…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	American Council On Renewable Energy Acore	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	11-50	15 contacts →
	Exact match “The American Council on Renewable Energy (ACORE) is a 501(c)(3) national nonprofit organization that unites finance, policy and technology to accelerate the transition to a…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20	Clean Energy Works	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	1-10	14 contacts →
	Exact match “The climate, health, and economic benefits of clean energy are clear, but not everyone has the resources to make the upgrades.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21	Sharing The Power Foundation	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	1-10	12 contacts →
	Exact match “Sharing The Power Foundation supports organizations and initiatives that advance environmental justice and contribute to an equitable distribution of benefits produced by the…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22	Sustain OUR Future Foundation	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	1-10	11 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	Third WAY Climate And Energy	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	9 contacts →
	Exact match “Our team designs and advocates for policies that will drive innovation and deployment of clean energy technologies, and deliver the emissions cuts we need to win the fight against…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
24	Solar Electric Light Fund Self	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	51-200	9 contacts →
	Exact match “The Solar Electric Light Fund (SELF) uses the power of the sun to fight poverty and climate change.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
25	Pareto Energy	Exact match	Washington, DC, United StatesHQ recorded Oct 9, 2026	1-10	8 contacts →
	Exact match “Pareto Energy’s brain trust of investors, lawyers and engineers funds communities of energy consumers seeking to insource their electric power supply as an alternative to…” Recorded in the RevenueBase company graph · Oct 9, 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 “clean energy 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 61 clean energy nonprofits based in Washington, United States

See the full list, filter by size, metro and specialty, and access 780 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Clean energy nonprofits based in Washington, United States at a glance

As of Oct 9, 2026

35.0%Verified-email coverage

36.5Average contacts per company

11-50Median size (employees)

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 61 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 Washington, United States whose business descriptions match “clean energy 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 780 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.

Clean energy nonprofits by metro in the United States

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

How many clean energy nonprofits are there based in Washington, United States?

RevenueBase identified 61 company matches for clean energy nonprofits associated with Washington, 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?

American Clean Power Association ACP tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most clean energy nonprofits?

New York leads the United States with 61 company records, followed by Washington (61) and San Francisco (38).

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 780 professional contacts with verified work emails tracked across these 61 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.