Company lists · Data refreshed September 2026
Top 25 Clean energy venture capital firms based in the United States
RevenueBase identified 722 clean energy venture capital firms headquartered in the United States as of September 2026 and tracks 9,671 professional contacts across them, including 4,440 with verified work emails. New York is the largest hub.
This list covers clean energy venture capital firms 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 27, 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 clean energy venture capital firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 428 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 316 contacts → | ||||
Indirect evidence “Arevon is a U.S.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 304 contacts → | ||||
Partial evidence “Who We Are Con Edison Development develops, owns and operates renewable and energy infrastructure projects.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 210 contacts → | ||||
Partial evidence “Founded in 2016, Longroad Energy is a U.S-based energy company focused on developing and operating wind, solar, storage, and data center projects throughout North America.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 196 contacts → | ||||
Partial evidence “HASI invests in sustainable infrastructure assets advancing the energy transition.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 193 contacts → | ||||
Partial evidence “Khosla Ventures invests in companies that are bold, early and impactful.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 173 contacts → | ||||
Strong evidence “Founded in 1998, Quantum Capital Group is a leading provider of private equity, credit, and venture capital to the global energy and energy transition industry, having managed…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 159 contacts → | ||||
Strong evidence “Breakthrough Energy backs companies developing the next generation of clean energy solutions.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 153 contacts → | ||||
Partial evidence “REV Renewables, an LS Power company, is an industry leader in the development, acquisition and operation of renewables and energy storage.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 141 contacts → | ||||
Partial evidence “As a multi-strategy investment manager and independent power producer, Greenbacker Renewable Energy Company (Greenbacker) is empowering a sustainable world by connecting…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 136 contacts → | ||||
Strong evidence “New Energy Nexus (NEX) is the world's leading ecosystem of funds and accelerators supporting diverse clean energy entrepreneurs to thrive, from emerging tech through to clean…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 125 contacts → | ||||
Strong evidence “BlueWave is a mission-driven clean energy developer, owner, and operator building solar and energy storage solutions that strengthen the electric grid and deliver long-term grid…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 106 contacts → | ||||
Indirect evidence “Speed and efficiency are the cornerstones of climate finance.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 100 contacts → | ||||
Strong evidence “WI Harper Group is a pioneering venture capital firm with over three decades of experience investing in transformative companies that shape the future.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 86 contacts → | ||||
Partial evidence “We lead the charge in providing renewable energy solutions that invigorate progress, enhance lives, and leave a legacy of environmental stewardship.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 82 contacts → | ||||
Strong evidence “Founded in 2013, New Energy Equity is an ALLETE company specializing in financing and developing solar power generation assets, providing clean electricity to commercial…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 76 contacts → | ||||
Strong evidence “Greycroft is a seed-to-growth venture capital firm that partners with entrepreneurs who are striving to build category-defining companies across intelligent consumer and…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 68 contacts → | ||||
Partial evidence “Renewable Properties specializes in developing and investing in small-scale utility and commercial solar energy projects throughout the United States.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 62 contacts → | ||||
Indirect evidence “Elemental Impact is a nonprofit investing platform with 15 years of experience advancing innovative technology that creates lasting economic and climate benefits across…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 59 contacts → | ||||
Strong evidence “True Green Capital Management LLC (“TGC”) is a specialized renewable energy infrastructure fund manager with a focus in distributed power generation in the US and Europe.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 57 contacts → | ||||
Partial evidence “Securing our energy abundant future requires a complete transformation of our global systems.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 55 contacts → | ||||
Strong evidence “We want to facilitate the transition from fossil fuels to clean, renewable energy.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 54 contacts → | ||||
Strong evidence “Clean Energy Ventures is a venture capital firm focused on investing in companies commercializing disruptive advanced energy technologies and business model innovations that can…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 52 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 27, 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: clean energy venture capital firms. 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 venture capital firms.
- Partial evidence
- Its own public description names part of clean energy venture capital firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name clean energy venture capital firms. 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 722 clean energy venture capital firms based in the United States
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Clean energy venture capital firms based in the United States at a glance
As of Sep 27, 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 722 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 venture capital firms, 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 venture capital firms”. 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 venture capital firms), 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 venture capital firms, 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, 4,440 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 27, 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 venture capital firms 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 venture capital firms, 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 venture capital firms are there based in the United States?
RevenueBase identified 722 clean energy venture capital firms 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?
Apex Clean Energy, headquartered in Charlottesville, tops this list with the largest team on record.
Which city has the most clean energy venture capital firms?
New York leads with 74 headquartered companies, followed by San Francisco (49) and Houston (42).
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 4,440 verified decision-maker contacts tracked across these 722 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 27, 2026.
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Clean energy venture capital firms by geography
- Clean energy venture capital firms based in Houston, United States
- Clean energy venture capital firms based in New York, United States
- Clean energy venture capital firms based in San Francisco, United States
- Clean energy venture capital firms based in Australia
- Clean energy venture capital firms based in Brazil
- Clean energy venture capital firms based in Canada
- Clean energy venture capital firms based in China
- Clean energy venture capital firms based in Denmark
- Clean energy venture capital firms based in France
- Clean energy venture capital firms based in Germany
- Clean energy venture capital firms based in India
- Clean energy venture capital firms based in Italy
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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