Company lists · Data refreshed August 2026

Top 25 Clean energy venture capital companies based in the United States

Name: Clean energy venture capital companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 524 companies tracked

RevenueBase identified 524 clean energy venture capital companies headquartered in the United States as of August 2026 and tracks 7,933 professional contacts across them, including 2,531 with verified work emails and 2,727 with mobile numbers. New York is the largest hub.

This list covers clean energy venture capital 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

524Companies

7,933Contacts tracked

2,531Verified emails

2,727Mobile numbers

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The 25 largest clean energy venture capital companies based in the United States

Ranked by team size

Top 25 of 524 clean energy venture capital companies based in the United States, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to clean energy venture capital 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	Envision Energy	Partial evidence	Houston, TX, United States	1,001-5,000	1,945 contacts →
	Partial evidence “Envision Energy is a world-leading green technology company that provides renewable energy solutions for global enterprises, governments, and institutions.” Source: RevenueBase Database · checked Aug 31, 2026
2	Palmetto	Strong evidence	Charlotte, NC, United States	201-500	533 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 Aug 31, 2026
3	HASI	Partial evidence	New York, NY, United States	51-200	194 contacts →
	Partial evidence “HASI invests in sustainable infrastructure assets advancing the energy transition.” Source: RevenueBase Database · checked Aug 31, 2026
4	Khosla Ventures	Partial evidence	Menlo Park, CA, United States	51-200	190 contacts →
	Partial evidence “Khosla Ventures invests in companies that are bold, early and impactful.” Source: RevenueBase Database · checked Aug 31, 2026
5	Quantum Capital Group	Strong evidence	Houston, TX, United States	51-200	178 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 Aug 31, 2026
6	Breakthrough Energy	Strong evidence	Kirkland, United States	51-200	158 contacts →
	Strong evidence “Breakthrough Energy backs companies developing the next generation of clean energy solutions.” Source: RevenueBase Database · checked Aug 31, 2026
7	NEW Energy Nexus	Strong evidence	Berkeley, CA, United States	51-200	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 Aug 31, 2026
8	Energy Impact Partners	Partial evidence	San Francisco, CA, United States	51-200	135 contacts →
	Partial evidence “Energy Impact Partners LP (EIP) is a global energy technology investor with a proprietary model designed to drive innovation.” Source: RevenueBase Database · checked Aug 31, 2026
9	Greengo Energy Group	Partial evidence	The Woodlands, TX, United States	51-200	91 contacts →
	Partial evidence “Renewable energy solutions that accelerate the energy transformation GreenGo Energy has worked since 2011 to accelerate the green transformation through a distinguished…” Source: RevenueBase Database · checked Aug 31, 2026
10	Greycroft	Strong evidence	Los Angeles, CA, United States	51-200	83 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 Aug 31, 2026
11	Ampyr Energy	Partial evidence	New York, United States	51-200	72 contacts →
	Partial evidence “AMPYR Energy is a global developer and operator of renewable energy assets, developing, investing and operating solar, wind and battery assets across the globe.” Source: RevenueBase Database · checked Aug 31, 2026
12	Thomaslloyd Group	Partial evidence	New York, NY, United States	1,001-5,000	65 contacts →
	Partial evidence “Founded in 2003, ThomasLloyd is a vertically integrated sustainable energy and technology solutions provider, integrating development, investment, operations, and technology on a…” Source: RevenueBase Database · checked Aug 31, 2026
13	Elemental Impact	Indirect evidence	Honolulu, HI, United States	51-200	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 Aug 31, 2026
14	Climate Investment CI	Partial evidence	Houston, TX, United States	51-200	61 contacts →
	Partial evidence “Climate Investment is a US and UK-based independently managed specialist investor focused on accelerating capital-efficient decarbonization of heavy emitting sectors.” Source: RevenueBase Database · checked Aug 31, 2026
15	IOWN	Strong evidence	La Jolla, CA, United States	51-200	55 contacts →
	Strong evidence “We want to facilitate the transition from fossil fuels to clean, renewable energy.” Source: RevenueBase Database · checked Aug 31, 2026
16	Tokyo GAS America LTD	Indirect evidence	Houston, TX, United States	11-50	50 contacts →
	Indirect evidence Source: RevenueBase Database · checked Aug 31, 2026
17	Sunwealth	Partial evidence	Cambridge, MA, United States	11-50	46 contacts →
	Partial evidence “Sunwealth’s mission is to invest in the future of energy, generating financial, social and environmental returns for investors and communities.” Source: RevenueBase Database · checked Aug 31, 2026
18	Toyota Ventures	Strong evidence	Los Altos, CA, United States	11-50	40 contacts →
	Strong evidence “Based in the San Francisco Bay Area, Toyota Ventures is Toyota’s early-stage venture capital firm with over $800 million in assets under management and a portfolio of 100+…” Source: RevenueBase Database · checked Aug 31, 2026
19	Sandbrook Capital	Partial evidence	Stamford, CT, United States	11-50	36 contacts →
	Partial evidence “We are a private investment firm dedicated exclusively to building businesses that help transform the world’s energy infrastructure.” Source: RevenueBase Database · checked Aug 31, 2026
20	SJF Ventures	Partial evidence	Durham, NC, United States	11-50	34 contacts →
	Partial evidence “SJF Ventures invests in high-growth companies creating a healthier, smarter and cleaner future.” Source: RevenueBase Database · checked Aug 31, 2026
21	The Westly Group	Strong evidence	Menlo Park, CA, United States	11-50	33 contacts →
	Strong evidence “The Westly Group is one of the largest venture funds in North America focused on the digitization and sustainability of the energy, mobility, building, and industrial sectors…” Source: RevenueBase Database · checked Aug 31, 2026
22	Spower	Indirect evidence	Spotsylvania, VA, United States	201-500	32 contacts →
	Indirect evidence “The AES Corporation finalized an agreement with Alberta Investment Management Corporation (AIMCo) that merged the sPower development platform, a leading independent solar…” Source: RevenueBase Database · checked Aug 31, 2026
23	National Renewable Solutions	Partial evidence	Minnetonka, MN, United States	11-50	28 contacts →
	Partial evidence “Our core business focuses on originating, acquiring and developing renewable energy projects throughout the US.” Source: RevenueBase Database · checked Aug 31, 2026
24	Fortistar	Indirect evidence	White Plains, NY, United States	201-500	25 contacts →
	Indirect evidence “Founded in 1993, Fortistar is a privately owned investment firm focused on accelerating the transition to a lower carbon future.” Source: RevenueBase Database · checked Aug 31, 2026
25	SE Ventures	Strong evidence	Menlo Park, CA, United States	51-200	24 contacts →
	Strong evidence “SE Ventures is a $1B+ venture capital firm based in Menlo Park.” Source: RevenueBase Database · checked Aug 31, 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 venture capital 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 venture capital companies.
Partial evidence: Its own public description names part of clean energy venture capital 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 venture capital 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 524 clean energy venture capital companies based in the United States

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Clean energy venture capital companies based in the United States at a glance

As of Aug 31, 2026

31.9%Verified-email coverage

34.4%Mobile-number coverage

15.1Average contacts per company

1-10Median size (employees)

10.9%Largest-city concentration · New York

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

342

11-50

144

51-200

201-500

501-1,000

1,001-5,000

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 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 venture capital 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 venture capital 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 venture capital 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, 2,531 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 August 31, 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 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 venture capital 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 venture capital companies are there based in the United States?

RevenueBase identified 524 clean energy venture capital companies headquartered in the United States as of August 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?

Envision Energy, headquartered in Houston, tops this list with the largest team on record.

Which city has the most clean energy venture capital companies?

New York leads with 57 headquartered companies, followed by San Francisco (39) and Houston (38).

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 2,531 verified decision-maker contacts tracked across these 524 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.