Company lists · Data refreshed September 2026

Top 23 Renewable energy nonprofits based in Washington, United States

Name: Renewable 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 Sep 17, 2026 41 companies tracked

RevenueBase identified 41 renewable energy nonprofits headquartered in Washington, United States as of September 2026 and tracks 1,827 professional contacts across them, including 530 with verified work emails. Washington is the largest hub.

This list covers renewable energy nonprofits headquartered in Washington, 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 17, 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 17, 2026 86% judged on-target in blind review

41Companies

1,827Contacts tracked

530Verified emails

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The 23 largest renewable energy nonprofits based in Washington, United States

Ranked by team size

Top 23 of 41 renewable energy nonprofits based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to renewable energy nonprofits: 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	SOL Systems	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	189 contacts →
	Partial evidence “Sol Systems is a national clean energy firm focused on building domestic energy that benefits local communities.” Source: RevenueBase Database · checked Sep 17, 2026
2	Solar United Neighbors	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	126 contacts →
	Strong evidence “Solar United Neighbors (SUN) is a national nonprofit organization helping people go solar, join together, and fight for their energy rights.” Source: RevenueBase Database · checked Sep 17, 2026
3	Smart Electric Power Alliance	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	95 contacts →
	Strong evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
4	The American Council For An Energy-Efficient Economy Aceee	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	91 contacts →
	Strong evidence “The American Council for an Energy-Efficient Economy a nonprofit research organization, develops policies to reduce energy waste and combat climate change.” Source: RevenueBase Database · checked Sep 17, 2026
5	Clearpath	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	65 contacts →
	Partial evidence “ClearPath’s mission is to accelerate American innovation to reduce global energy emissions.” Source: RevenueBase Database · checked Sep 17, 2026
6	Solar Solution	Indirect evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	43 contacts →
	Indirect evidence “Solar Solution, based in Washington D.C, was founded in 2008 and has grown to become one of the largest solar PV installers and developers in the region.” Source: RevenueBase Database · checked Sep 17, 2026
7	Groundswell, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	42 contacts →
	Indirect evidence “Groundswell builds community power to strengthen local resilience for everyone and cut electricity bills in half for our neighbors who need savings the most.” Source: RevenueBase Database · checked Sep 17, 2026
8	Alliance For Tribal Clean Energy	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	36 contacts →
	Strong evidence “The Alliance for Tribal Energy 501(c)(3) is an Indigenous-led nonprofit that supports the self-determined efforts of Native American tribes to transition away from extractive and…” Source: RevenueBase Database · checked Sep 17, 2026
9	American Council On Renewable Energy Acore	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	34 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
10	Evergreen Action	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	33 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
11	Zoetic Global	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	18 contacts →
	Strong evidence “At Zoetic Global, our mission is to revolutionize the energy sector through innovative solutions that unleash the power of renewable resources.” Source: RevenueBase Database · checked Sep 17, 2026
12	Invest In OUR Future	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	16 contacts →
	Partial evidence “Invest in Our Future supports philanthropic organizations to mobilize funds to ensure that unprecedented federal clean energy investments strengthen communities across the…” Source: RevenueBase Database · checked Sep 17, 2026
13	Pioneer Public Affairs	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	16 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
14	Renewable Energy Wildlife Institute Rewi	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	11-50	15 contacts →
	Strong evidence “The Renewable Energy Wildlife Institute (REWI) is an independent 501(c)3 organization that develops and leverages scientific research around renewable energy interactions with…” Source: RevenueBase Database · checked Sep 17, 2026
15	Clean Energy Works	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	15 contacts →
	Partial evidence “The climate, health, and economic benefits of clean energy are clear, but not everyone has the resources to make the upgrades.” Source: RevenueBase Database · checked Sep 17, 2026
16	Sustain OUR Future Foundation	Indirect evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	11 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
17	Solar Electric Light Fund Self	Indirect evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	9 contacts →
	Indirect evidence “The Solar Electric Light Fund (SELF) uses the power of the sun to fight poverty and climate change.” Source: RevenueBase Database · checked Sep 17, 2026
18	Clean Energy Business Network Cebn	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	5 contacts →
	Partial evidence “The Clean Energy Business Network (CEBN) works to grow the clean energy economy through policy, public education, and business support for energy companies.” Source: RevenueBase Database · checked Sep 17, 2026
19	Technology Transition Corporation	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	5 contacts →
	Partial evidence “TTC grows clean energy industries.” Source: RevenueBase Database · checked Sep 17, 2026
20	Emeraldplanet & The Emeraldplanet Television Productions	Indirect evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	4 contacts →
	Indirect evidence “The EmeraldPlanet is a not-for-profit 501(c)(3) organization with its headquarters and television production studios in Washington, D.C.” Source: RevenueBase Database · checked Sep 17, 2026
21	NEW Partners Community Solar	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	3 contacts →
	Partial evidence “New Partners Community Solar is a 501(c)(3) non-profit organization, dedicated to clean energy and environmental justice.” Source: RevenueBase Database · checked Sep 17, 2026
22	Vittoria Energy Expedition	Strong evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	1-10	2 contacts →
	Strong evidence “Vittoria Energy Expedition is a 501(c)(3) nonprofit founded in 2015 to connect everyday people to clean power innovations.” Source: RevenueBase Database · checked Sep 17, 2026
23	Renewables Forward	Partial evidence	Washington, DC, United StatesHQ checked Sep 17, 2026	51-200	1 contacts →
	Partial evidence “The transition to an economy powered by clean energy is under way.” Source: RevenueBase Database · checked Sep 17, 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: renewable energy nonprofits. 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 renewable energy nonprofits.
Partial evidence: Its own public description names part of renewable energy nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name renewable energy nonprofits. 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 23 of 41 renewable energy nonprofits based in Washington, United States

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

As of Sep 17, 2026

29.0%Verified-email coverage

44.6Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Washington

Sep 17, 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 41 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 renewable energy nonprofits, 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 Washington, United States whose own description of what they do matches “renewable energy nonprofits”. 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 renewable energy nonprofits), 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 renewable energy nonprofits, and records with no verified work email. Companies headquartered outside Washington 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, 530 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 17, 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.

Renewable energy nonprofits by metro in the United States

Renewable energy nonprofits in Washington41
Renewable energy nonprofits in New York39
Renewable energy nonprofits in Austin26

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 renewable energy nonprofits, 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 renewable energy nonprofits are there based in Washington, United States?

RevenueBase identified 41 renewable energy nonprofits headquartered in Washington, 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?

SOL Systems, headquartered in Washington, tops this list with the largest team on record.

Which city has the most renewable energy nonprofits?

Washington leads with 41 headquartered companies, followed by New York (39) and Austin (26).

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 530 verified decision-maker contacts tracked across these 41 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 17, 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.