Company lists · Data refreshed September 2026
Top 25 Carbon-free energy providers based in the United States
RevenueBase identified 1,237 carbon-free energy providers headquartered in the United States as of September 2026 and tracks 98,049 professional contacts across them, including 25,418 with verified work emails. Houston is the largest hub.
This list covers carbon-free energy providers 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.
The 25 largest carbon-free energy providers based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 9,458 contacts → | ||||
Strong 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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 7,974 contacts → | ||||
Partial evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 5,036 contacts → | ||||
Indirect evidence “High reliability, low prices and high customer satisfaction are cornerstones of our customer commitment, but it doesn't end there.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,645 contacts → | ||||
Partial evidence “Established in 1997, Just Energy has been a leading retail energy provider serving markets across the United States and Canada.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,499 contacts → | ||||
Partial evidence “Austin Energy is one of the largest publicly owned electric utilities in the nation, providing low-cost reliable power to more than customers and more than 1 million residents.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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, 2026Thanks. The Data Team will review it. | |||||
| 12 | 889 contacts → | ||||
Partial evidence “TXU Energy has a long-standing history of doing the right things for our customers.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 795 contacts → | ||||
Partial evidence “Clearway Energy Group’s vision is a world powered by clean energy.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 719 contacts → | ||||
Indirect evidence “We’re on a mission to make power personal.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 705 contacts → | ||||
Indirect evidence “At Dynegy, we deliver more than just power to residential, municipal, commercial, and industrial customers across several states.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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, 2026Thanks. The Data Team will review it. | |||||
| 18 | 507 contacts → | ||||
Partial evidence “PosiGen is the nation's leading residential solar and energy efficiency provider.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 500 contacts → | ||||
Partial evidence “Atlas Renewable Energy delivers clean energy at scale.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 428 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 390 contacts → | ||||
Indirect evidence “At Rocky Mountain Power we believe in our promise of public service: an obligation to deliver safe, reliable electricity at an affordable price in an environmentally sustainable…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 386 contacts → | ||||
Partial evidence “LRE (Leeward Renewable Energy) is forging an American energy future with integrity, innovation, and positive impact.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 370 contacts → | ||||
Partial evidence “Supernova embodies the spirit of innovation and dedication to a sustainable future, making it a shining example of what it means to be a leader in the renewable energy industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 368 contacts → | ||||
Partial evidence “V3 was founded as a response to the stagnation within the energy industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 320 contacts → | ||||
Partial evidence “We are well-positioned as a provider of resilient, reliable and competitively-priced energy with operations across the nation.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
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: carbon-free energy providers. 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 carbon-free energy providers.
- Partial evidence
- Its own public description names part of carbon-free energy providers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name carbon-free energy providers. 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 1,237 carbon-free energy providers based in the United States
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Carbon-free energy providers based in the United States at a glance
As of Sep 16, 2026Companies by employee count
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 1,237 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 carbon-free energy providers, 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 “carbon-free energy providers”. 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 carbon-free energy providers), 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 carbon-free energy providers, 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, 25,418 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.
Carbon-free energy providers by metro
- Carbon-free energy providers in Houston43
- Carbon-free energy providers in New York27
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 carbon-free energy providers, 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 carbon-free energy providers are there based in the United States?
RevenueBase identified 1,237 carbon-free energy providers 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 carbon-free energy providers?
Houston leads with 43 headquartered companies, followed by New York (27) and Austin (24).
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 25,418 verified decision-maker contacts tracked across these 1,237 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.
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