Company lists · Data refreshed September 2026

Top 25 Renewable energy startups based in the United States

Name: Renewable energy startups 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 2,146 companies tracked

RevenueBase identified 2,146 renewable energy startups headquartered in the United States as of September 2026 and tracks 158,740 professional contacts across them, including 53,657 with verified work emails. New York is the largest hub.

This list covers renewable energy startups 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

2,146Companies

158,740Contacts tracked

53,657Verified emails

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The 25 largest renewable energy startups based in the United States

Ranked by team size

Top 25 of 2,146 renewable energy startups 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 renewable energy startups: 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	Dominion Energy	Partial evidence	Richmond, VA, United StatesHQ checked Sep 16, 2026	10001+	31,976 contacts →
	Partial evidence “Dominion Energy (NYSE: D), headquartered in Richmond, Va, provides regulated electricity service to 3.6 million homes and businesses in Virginia, North Carolina, and South…” Source: RevenueBase Database · checked Sep 16, 2026
2	GE Vernova	Partial evidence	Boston, MA, United StatesHQ checked Sep 16, 2026	10001+	29,528 contacts →
	Partial evidence “GE Vernova is a purpose-built energy technology company on a mission to electrify to thrive and decarbonize the world.” Source: RevenueBase Database · checked Sep 16, 2026
3	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
4	Sunrun	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	10001+	7,974 contacts →
	Partial evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
5	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
6	Vistra Corp	Indirect evidence	Irving, TX, United StatesHQ checked Sep 16, 2026	5,001-10,000	2,466 contacts →
	Indirect evidence “Vistra (NYSE: VST) is a leading Fortune 500 integrated retail electricity and power generation company, based in Irving, Texas, that provides essential resources to customers…” Source: RevenueBase Database · checked Sep 16, 2026
7	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
8	Calpine	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,112 contacts →
	Indirect evidence “A business unit of Constellation (NASDAQ: CEG), Calpine Corporation is America’s largest generator of electricity from natural gas and geothermal resources with operations in…” Source: RevenueBase Database · checked Sep 16, 2026
9	Trinity Solar	Indirect evidence	Wall Township, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,794 contacts →
	Indirect evidence “Trinity Solar is one of the largest privately held residential solar companies in the nation.” Source: RevenueBase Database · checked Sep 16, 2026
10	Solv Energy	Strong evidence	San Diego, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,286 contacts →
	Strong 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
11	Qcells North America	Partial evidence	Irvine, CA, United StatesHQ checked Sep 16, 2026	501-1,000	954 contacts →
	Partial evidence “Qcells is a renowned complete energy solutions provider in solar cell and module, energy storage, downstream project business and energy retail.” Source: RevenueBase Database · checked Sep 16, 2026
12	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
13	Recurrent Energy	Partial evidence	Austin, United StatesHQ checked Sep 16, 2026	501-1,000	931 contacts →
	Partial 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
14	Sunnova Energy	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	906 contacts →
	Partial 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
15	CLECO	Partial evidence	Pineville, LA, United StatesHQ checked Sep 16, 2026	1,001-5,000	867 contacts →
	Partial 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
16	Clearway Energy Group	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	501-1,000	795 contacts →
	Partial evidence “Clearway Energy Group’s vision is a world powered by clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
17	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
18	Grid Alternatives	Partial evidence	Oakland, CA, United StatesHQ checked Sep 16, 2026	201-500	731 contacts →
	Partial evidence “GRID Alternatives is a national leader in bringing affordable solar power, clean mobility, and energy storage to underserved communities while creating pathways to life-changing…” Source: RevenueBase Database · checked Sep 16, 2026
19	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
20	Strata Clean Energy	Partial evidence	Durham, NC, United StatesHQ checked Sep 16, 2026	501-1,000	631 contacts →
	Partial 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
21	Depcom Power, INC	Partial evidence	Scottsdale, AZ, United StatesHQ checked Sep 16, 2026	1,001-5,000	624 contacts →
	Partial 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
22	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
23	Apex Clean Energy	Partial evidence	Charlottesville, VA, United StatesHQ checked Sep 16, 2026	201-500	594 contacts →
	Partial evidence “Apex Clean Energy was founded with a singular focus: to accelerate the shift to clean energy.” Source: RevenueBase Database · checked Sep 16, 2026
24	Palmetto	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 16, 2026	201-500	539 contacts →
	Partial 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
25	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

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 startups. 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 startups.
Partial evidence: Its own public description names part of renewable energy startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name renewable energy startups. 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 2,146 renewable energy startups based in the United States

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Renewable energy startups based in the United States at a glance

As of Sep 16, 2026

33.8%Verified-email coverage

74.0Average contacts per company

11-50Median size (employees)

4.7%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

896

11-50

796

51-200

306

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 2,146 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 startups, 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 “renewable energy startups”. 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 startups), 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 startups, 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, 53,657 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.

Renewable energy startups 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 renewable energy startups, 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 startups are there based in the United States?

RevenueBase identified 2,146 renewable energy startups 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?

Dominion Energy, headquartered in Richmond, tops this list with the largest team on record.

Which city has the most renewable energy startups?

New York leads with 100 headquartered companies, followed by Houston (79) and Austin (48).

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 53,657 verified decision-maker contacts tracked across these 2,146 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.