Company lists · Data refreshed September 2026

Top 25 Energy startups based in the United States

Name: 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 15, 2026 2,345 companies tracked

RevenueBase identified 2,345 energy startups headquartered in the United States as of September 2026 and tracks 159,257 professional contacts across them, including 62,880 with verified work emails. Houston is the largest hub.

This list covers 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 15, 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 15, 2026 86% judged on-target in blind review

2,345Companies

159,257Contacts tracked

62,880Verified emails

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The 25 largest energy startups based in the United States

Ranked by team size

Top 25 of 2,345 energy startups based in the United States, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to 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	GE Vernova	Partial evidence	Boston, MA, United StatesHQ checked Sep 15, 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 15, 2026
2	Constellation	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 15, 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 15, 2026
3	DTE Energy	Partial evidence	Detroit, MI, United StatesHQ checked Sep 15, 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 15, 2026
4	Sunrun	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 15, 2026	10001+	7,974 contacts →
	Partial evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 15, 2026
5	Nextera Energy Resources	Partial evidence	Juno Beach, FL, United StatesHQ checked Sep 15, 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 15, 2026
6	The AES Corporation	Partial evidence	Arlington, VA, United StatesHQ checked Sep 15, 2026	5,001-10,000	5,387 contacts →
	Partial evidence “The world no longer thinks of energy as a matter of supply and demand.” Source: RevenueBase Database · checked Sep 15, 2026
7	Hubbell Incorporated	Partial evidence	Shelton, CT, United StatesHQ checked Sep 15, 2026	10001+	4,053 contacts →
	Partial evidence “Hubbell Incorporated is a leading manufacturer of utility and electrical solutions that help build more reliable, resilient, and renewable energy infrastructure.” Source: RevenueBase Database · checked Sep 15, 2026
8	Generac	Partial evidence	Waukesha, WI, United StatesHQ checked Sep 15, 2026	5,001-10,000	3,797 contacts →
	Partial evidence “Generac is the total energy solutions company powering a smarter world.” Source: RevenueBase Database · checked Sep 15, 2026
9	Enphase Energy	Partial evidence	Fremont, CA, United StatesHQ checked Sep 15, 2026	1,001-5,000	3,130 contacts →
	Partial evidence “Enphase Energy is a global energy technology company and the world’s leading supplier of microinverter-based solar and battery systems.” Source: RevenueBase Database · checked Sep 15, 2026
10	Invenergy	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 15, 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 15, 2026
11	Babcock & Wilcox	Partial evidence	Akron, OH, United StatesHQ checked Sep 15, 2026	1,001-5,000	2,340 contacts →
	Partial evidence “Babcock & Wilcox, based in Akron, Ohio, USA is a global leader in energy and environmental technologies and services for power, renewable and industrial markets.” Source: RevenueBase Database · checked Sep 15, 2026
12	Fluence	Partial evidence	Arlington, VA, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,863 contacts →
	Partial evidence “To achieve our mission, we design, deploy, and operate the world’s most advanced modular energy storage products, comprehensive lifecycle services, and AI-enabled asset management…” Source: RevenueBase Database · checked Sep 15, 2026
13	Mitsubishi Power Americas	Indirect evidence	Lake Mary, FL, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,859 contacts →
	Indirect evidence “Mitsubishi Power Americas is creating a future that works for people and the planet through innovative power generation technology and solutions.” Source: RevenueBase Database · checked Sep 15, 2026
14	GE Digital	Partial evidence	San Ramon, CA, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,763 contacts →
	Partial evidence “At GE Digital, our focus is clear: delivering software that accelerates a new era of energy.” Source: RevenueBase Database · checked Sep 15, 2026
15	IGS Energy	Partial evidence	Dublin, OH, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,388 contacts →
	Partial evidence “IGS Energy has been a trusted energy advisor since 1989, growing into one of the nation’s top energy retailers.” Source: RevenueBase Database · checked Sep 15, 2026
16	Solv Energy	Partial evidence	San Diego, CA, United StatesHQ checked Sep 15, 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 15, 2026
17	Ormat Technologies, INC	Indirect evidence	Reno, NV, United StatesHQ checked Sep 15, 2026	1,001-5,000	1,281 contacts →
	Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 15, 2026
18	Qcells North America	Partial evidence	Irvine, CA, United StatesHQ checked Sep 15, 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 15, 2026
19	Recurrent Energy	Partial evidence	Austin, United StatesHQ checked Sep 15, 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 15, 2026
20	Sunnova Energy	Partial evidence	Houston, TX, United StatesHQ checked Sep 15, 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 15, 2026
21	Form Energy	Partial evidence	Somerville, MA, United StatesHQ checked Sep 15, 2026	501-1,000	807 contacts →
	Partial evidence “Form Energy is an American company driving innovation in energy technology and manufacturing.” Source: RevenueBase Database · checked Sep 15, 2026
22	Clearway Energy Group	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 15, 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 15, 2026
23	Pattern Energy	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 15, 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 15, 2026
24	Powersecure, INC	Partial evidence	Durham, NC, United StatesHQ checked Sep 15, 2026	501-1,000	740 contacts →
	Partial evidence “PowerSecure, a Southern Company subsidiary, is a leading provider of innovative energy solutions to electric utilities and their industrial, institutional, and commercial…” Source: RevenueBase Database · checked Sep 15, 2026
25	Resource Innovations	Partial evidence	Half Moon Bay, CA, United StatesHQ checked Sep 15, 2026	501-1,000	733 contacts →
	Partial evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 15, 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: 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 energy startups.
Partial evidence: Its own public description names part of energy startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name 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 2,345 energy startups based in the United States

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Energy startups based in the United States at a glance

As of Sep 15, 2026

39.5%Verified-email coverage

67.9Average contacts per company

11-50Median size (employees)

4.4%Largest-city concentration · Houston

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

1,003

11-50

817

51-200

323

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 2,345 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 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 “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 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 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, 62,880 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 15, 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.

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 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 energy startups are there based in the United States?

RevenueBase identified 2,345 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?

GE Vernova, headquartered in Boston, tops this list with the largest team on record.

Which city has the most energy startups?

Houston leads with 104 headquartered companies, followed by New York (102) and Austin (52).

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 62,880 verified decision-maker contacts tracked across these 2,345 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 15, 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.