Company lists · Data refreshed September 2026

Top 25 Clean energy development companies based in the United States

Name: Clean energy development 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 16, 2026 2,806 companies tracked

RevenueBase identified 2,806 clean energy development companies headquartered in the United States as of September 2026 and tracks 100,503 professional contacts across them, including 40,926 with verified work emails. New York is the largest hub.

This list covers clean energy development companies 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

2,806Companies

100,503Contacts tracked

40,926Verified emails

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The 25 largest clean energy development companies based in the United States

Ranked by team size

Top 25 of 2,806 clean energy development companies 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 clean energy development companies: 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	Constellation	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 16, 2026	10001+	9,458 contacts →
	Partial evidence “Constellation Energy Corporation (Nasdaq: CEG), a Fortune 200 company headquartered in Baltimore, is the nation’s largest producer of reliable, emissions-free energy and a leading…” Source: RevenueBase Database · checked Sep 16, 2026
2	DTE Energy	Partial evidence	Detroit, MI, United StatesHQ checked Sep 16, 2026	10001+	9,087 contacts →
	Partial evidence “DTE is one of the largest Fortune 500 diversified energy companies, proudly serving Michigan for over a century.” Source: RevenueBase Database · checked Sep 16, 2026
3	Sunrun	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	10001+	7,974 contacts →
	Strong evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
4	Nextera Energy Resources	Partial evidence	Juno Beach, FL, United StatesHQ checked Sep 16, 2026	10001+	6,221 contacts →
	Partial evidence “NextEra Energy Resources, LLC, together with its affiliated entities,("NextEra Energy Resources") is one of the largest energy infrastructure companies in North America.” Source: RevenueBase Database · checked Sep 16, 2026
5	Invenergy	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,408 contacts →
	Indirect evidence “Invenergy is North America’s largest privately held developer, owner, and operator of innovative, reliable power infrastructure.” Source: RevenueBase Database · checked Sep 16, 2026
6	Solv Energy	Partial evidence	San Diego, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,286 contacts →
	Partial evidence “SOLV Energy is a renewable energy solutions provider for utility solar, energy storage, and high voltage projects in North America.” Source: RevenueBase Database · checked Sep 16, 2026
7	Ormat Technologies, INC	Indirect evidence	Reno, NV, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,281 contacts →
	Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
8	Powur, PBC	Strong evidence	San Diego, United StatesHQ checked Sep 16, 2026	n/a	1,199 contacts →
	Strong evidence “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.” Source: RevenueBase Database · checked Sep 16, 2026
9	California Resources Corporation	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,095 contacts →
	Partial evidence “California Resources Corporation (CRC) is an independent energy and carbon management company committed to energy transition.” Source: RevenueBase Database · checked Sep 16, 2026
10	Wanzek Construction, Inc., A Mastec Company	Strong evidence	Fargo, ND, United StatesHQ checked Sep 16, 2026	1,001-5,000	933 contacts →
	Strong evidence “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Source: RevenueBase Database · checked Sep 16, 2026
11	Recurrent Energy	Strong evidence	Austin, United StatesHQ checked Sep 16, 2026	501-1,000	931 contacts →
	Strong evidence “Recurrent Energy, a subsidiary of Canadian Solar Inc, is one of the world's largest and most geographically diversified utility-scale solar and energy storage project development…” Source: RevenueBase Database · checked Sep 16, 2026
12	Sunnova Energy	Strong evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	906 contacts →
	Strong evidence “Sunnova Energy International Inc.(NYSE: NOVA) is an industry-leading energy services company focused on making clean energy more accessible, reliable, and affordable for…” Source: RevenueBase Database · checked Sep 16, 2026
13	CLECO	Strong evidence	Pineville, LA, United StatesHQ checked Sep 16, 2026	1,001-5,000	867 contacts →
	Strong evidence “At Cleco, we consider it an honor to provide the next generation with the resources they need for personal and professional success through sustainable, clean and safe energy…” Source: RevenueBase Database · checked Sep 16, 2026
14	Clearway Energy Group	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	501-1,000	795 contacts →
	Strong evidence “Clearway Energy Group’s vision is a world powered by clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
15	Pattern Energy	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	501-1,000	755 contacts →
	Partial evidence “Pattern Energy is one of the world’s largest privately-owned developers and operators of wind, solar, transmission, and energy storage projects.” Source: RevenueBase Database · checked Sep 16, 2026
16	Resource Innovations	Partial evidence	Half Moon Bay, CA, United StatesHQ checked Sep 16, 2026	501-1,000	733 contacts →
	Partial evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 16, 2026
17	LUMIO	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 16, 2026	5,001-10,000	719 contacts →
	Indirect evidence “We’re on a mission to make power personal.” Source: RevenueBase Database · checked Sep 16, 2026
18	Strata Clean Energy	Strong evidence	Durham, NC, United StatesHQ checked Sep 16, 2026	501-1,000	631 contacts →
	Strong evidence “Strata Clean Energy is a fully integrated energy infrastructure company serving utilities, independent power producers, and hyperscalers navigating the rapid transformation of the…” Source: RevenueBase Database · checked Sep 16, 2026
19	Depcom Power, INC	Strong evidence	Scottsdale, AZ, United StatesHQ checked Sep 16, 2026	1,001-5,000	624 contacts →
	Strong evidence “DEPCOM Power, a Koch Engineered Solutions Company, is a leading solar energy solutions partner providing Development Support, Engineering, Procurement & Construction (EPC)…” Source: RevenueBase Database · checked Sep 16, 2026
20	Nexamp	Partial evidence	Boston, MA, United StatesHQ checked Sep 16, 2026	201-500	607 contacts →
	Partial evidence “Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.” Source: RevenueBase Database · checked Sep 16, 2026
21	Apex Clean Energy	Strong evidence	Charlottesville, VA, United StatesHQ checked Sep 16, 2026	201-500	594 contacts →
	Strong evidence “Apex Clean Energy was founded with a singular focus: to accelerate the shift to clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
22	Palmetto	Strong evidence	Charlotte, NC, United StatesHQ checked Sep 16, 2026	201-500	539 contacts →
	Strong evidence “Palmetto is a leading clean tech company on a mission to accelerate the transition to a clean energy future.” Source: RevenueBase Database · checked Sep 16, 2026
23	Atlas Renewable Energy	Strong evidence	Miami, FL, United StatesHQ checked Sep 16, 2026	201-500	500 contacts →
	Strong evidence “Atlas Renewable Energy delivers clean energy at scale.” Source: RevenueBase Database · checked Sep 16, 2026
24	LS Power	Strong evidence	New York, NY, United StatesHQ checked Sep 16, 2026	201-500	478 contacts →
	Strong evidence “Founded in 1990, LS Power is a premier development, investment, and operating company focused on the North American power and energy infrastructure sector, with leading platforms…” Source: RevenueBase Database · checked Sep 16, 2026
25	REC Solar	Indirect evidence	San Luis Obispo, CA, United StatesHQ checked Sep 16, 2026	n/a	471 contacts →
	Indirect evidence “Founded in 1997, REC Solar has emerged as a leader in the solar industry, installing 800+ solar and storage solutions for commercial and public sector customers nationwide.” 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: clean energy development companies. 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 clean energy development companies.
Partial evidence: Its own public description names part of clean energy development companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean energy development companies. 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 2,806 clean energy development companies based in the United States

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Clean energy development companies based in the United States at a glance

As of Sep 16, 2026

40.7%Verified-email coverage

35.8Average contacts per company

11-50Median size (employees)

4.9%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

1,353

11-50

970

51-200

333

201-500

501-1,000

1,001-5,000

5,001-10,000

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 2,806 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 clean energy development companies, 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 “clean energy development companies”. 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 clean energy development companies), 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 clean energy development companies, 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, 40,926 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.

Clean energy development companies by metro

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 clean energy development companies, 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 clean energy development companies are there based in the United States?

RevenueBase identified 2,806 clean energy development companies 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?

Constellation, headquartered in Baltimore, tops this list with the largest team on record.

Which city has the most clean energy development companies?

New York leads with 137 headquartered companies, followed by Houston (109) and San Francisco (65).

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 40,926 verified decision-maker contacts tracked across these 2,806 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.