Company lists · Data refreshed September 2026

Top 25 Cleantech accelerators worldwide

Name: Cleantech accelerators worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 3,670 companies tracked

RevenueBase identified 3,670 cleantech accelerators worldwide as of September 2026 and tracks 54,069 professional contacts across them, including 9,833 with verified work emails. The United States is the largest market and London the largest hub.

This list covers cleantech accelerators worldwide, 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 19, 2026. Country and city lists for cleantech accelerators follow the table.

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 19, 2026 86% judged on-target in blind review

3,670Companies

54,069Contacts tracked

9,833Verified emails

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The 25 largest cleantech accelerators worldwide

Ranked by team size

Top 25 of 3,670 cleantech accelerators worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to cleantech accelerators: 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	Team For The Planet	Indirect evidence	Lyon, FranceHQ checked Sep 19, 2026	n/a	16,533 contacts →
	Indirect evidence “Entrepreneurship in the service of the climate emergency!” Source: RevenueBase Database · checked Sep 19, 2026
2	Techstars	Indirect evidence	New York City, NY, United StatesHQ checked Sep 19, 2026	n/a	1,803 contacts →
	Indirect evidence “Techstars helps founders scale their startups into world-changing businesses.” Source: RevenueBase Database · checked Sep 19, 2026
3	Powur, PBC	Indirect evidence	San Diego, United StatesHQ checked Sep 19, 2026	n/a	1,199 contacts →
	Indirect evidence “The Powur Mission: Accelerate the adoption of clean energy worldwide We're empowering our community of homeowners and advisors to thrive in the global shift to sustainable energy.” Source: RevenueBase Database · checked Sep 19, 2026
4	VITO	Partial evidence	Mol, BelgiumHQ checked Sep 19, 2026	1,001-5,000	1,117 contacts →
	Partial evidence “VITO is an independent Flemish research organisation in the area of cleantech and sustainable development.” Source: RevenueBase Database · checked Sep 19, 2026
5	AIRA	Indirect evidence	Stockholm, SwedenHQ checked Sep 19, 2026	201-500	600 contacts →
	Indirect evidence “Aira is the next generation home energy champion.” Source: RevenueBase Database · checked Sep 19, 2026
6	Palmetto	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 19, 2026	201-500	539 contacts →
	Indirect 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 19, 2026
7	Startupbootcamp	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	201-500	522 contacts →
	Indirect evidence “At Startupbootcamp, we supercharge startup growth – providing capital, world-class mentorship, and direct access to investors, corporate partners, and industry experts.” Source: RevenueBase Database · checked Sep 19, 2026
8	Sonnen Gmbh	Indirect evidence	Wildpoldsried, GermanyHQ checked Sep 19, 2026	501-1,000	514 contacts →
	Indirect evidence “Clean, affordable energy for all is one of the greatest challenges of our time.” Source: RevenueBase Database · checked Sep 19, 2026
9	Westport Fuel Systems	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 19, 2026	51-200	480 contacts →
	Indirect evidence “Westport is a clean-tech innovation company, providing simplified solutions to decarbonize.” Source: RevenueBase Database · checked Sep 19, 2026
10	Chakr Innovation	Partial evidence	Gurugram, IndiaHQ checked Sep 19, 2026	501-1,000	476 contacts →
	Partial evidence “Chakr Innovation is a pioneering Indian cleantech startup, founded by IIT Delhi graduates, dedicated to revolutionizing air quality with cutting-edge material science technology.” Source: RevenueBase Database · checked Sep 19, 2026
11	NRGI	Partial evidence	Aarhus, DenmarkHQ checked Sep 19, 2026	1,001-5,000	451 contacts →
	Partial evidence “NRGi is an accelerator for the green transition in Denmark - and a better future.” Source: RevenueBase Database · checked Sep 19, 2026
12	Ecozen	Indirect evidence	Pune, IndiaHQ checked Sep 19, 2026	201-500	429 contacts →
	Indirect evidence “Ecozen develops climate-smart deeptech solutions and core technology stacks to deliver a sustainable future, including motor controls, IoT, and energy storage.” Source: RevenueBase Database · checked Sep 19, 2026
13	Alchemist Accelerator	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	n/a	321 contacts →
	Partial evidence “The Alchemist Accelerator is a venture-backed initiative focused on accelerating the development of seed-stage ventures that monetize from enterprises (not consumers).” Source: RevenueBase Database · checked Sep 19, 2026
14	Lanzadera	Indirect evidence	Valencia, SpainHQ checked Sep 19, 2026	n/a	311 contacts →
	Indirect evidence “LANZADERA es la aceleradora de Marina de Empresas, se trata de un proyecto de capital totalmente privado impulsado por Juan Roig (Presidente de Mercadona).” Source: RevenueBase Database · checked Sep 19, 2026
15	Fuse Energy	Indirect evidence	London, TX, United KingdomHQ checked Sep 19, 2026	501-1,000	285 contacts →
	Indirect evidence “We are building a full stack energy company to lower cost of energy & accelerate energy abundance.” Source: RevenueBase Database · checked Sep 19, 2026
16	Vecmocon Technologies	Indirect evidence	New Delhi, IndiaHQ checked Sep 19, 2026	51-200	214 contacts →
	Indirect evidence “Vecmocon Technologies is a Deep-Tech startup focused on sustainable and clean mobility.” Source: RevenueBase Database · checked Sep 19, 2026
17	Energy & Environmental Research Center	Indirect evidence	Grand Forks, ND, United StatesHQ checked Sep 19, 2026	201-500	213 contacts →
	Indirect evidence “The Energy & Environmental Research Center (EERC) is recognized as one of the world's leading developers of cleaner, more efficient energy to power the world and environmental…” Source: RevenueBase Database · checked Sep 19, 2026
18	Rockstart	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	n/a	175 contacts →
	Indirect evidence “Rockstart is an early stage investor that empowers purpose-driven founders across three domains: Energy, AgriFood, and Emerging Technologies.” Source: RevenueBase Database · checked Sep 19, 2026
19	Brennand Energia S A	Indirect evidence	BrazilHQ checked Sep 19, 2026	201-500	167 contacts →
	Indirect evidence “Especializada em geração de energia limpa.” Source: RevenueBase Database · checked Sep 19, 2026
20	LOS Angeles Cleantech Incubator Laci	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 19, 2026	51-200	163 contacts →
	Partial evidence “Los Angeles Cleantech Incubator (LACI) is creating an inclusive green economy for the people of Los Angeles by unlocking innovation by working with startups to accelerate the…” Source: RevenueBase Database · checked Sep 19, 2026
21	Breakthrough Energy	Indirect evidence	Kirkland, United StatesHQ checked Sep 19, 2026	51-200	159 contacts →
	Indirect evidence “Breakthrough Energy backs companies developing the next generation of clean energy solutions.” Source: RevenueBase Database · checked Sep 19, 2026
22	Cleanchoice Energy	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	155 contacts →
	Partial evidence “CleanChoice Energy is a cleantech company that empowers people and businesses to easily access climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026
23	Massachusetts Clean Energy Center	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	149 contacts →
	Indirect evidence “The Massachusetts Clean Energy Center is a state economic development agency dedicated to accelerating the growth of the clean energy and climatetech sector across the…” Source: RevenueBase Database · checked Sep 19, 2026
24	BRINC	Partial evidence	Abu Dhabi, Hong KongHQ checked Sep 19, 2026	51-200	146 contacts →
	Partial evidence “We give investors access to private opportunities, help corporates and governments innovate with accelerator programs and support founders to build lasting businesses.” Source: RevenueBase Database · checked Sep 19, 2026
25	Foresight Canada	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 19, 2026	11-50	143 contacts →
	Indirect evidence “In the world we’re building, sustainability isn't a buzzword.” Source: RevenueBase Database · checked Sep 19, 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: cleantech accelerators. 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 cleantech accelerators.
Partial evidence: Its own public description names part of cleantech accelerators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cleantech accelerators. 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 3,670 cleantech accelerators worldwide

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Cleantech accelerators worldwide at a glance

As of Sep 19, 2026

18.2%Verified-email coverage

14.7Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

2,437

11-50

971

51-200

169

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 cleantech accelerators, 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.
Coverage: Every country. Country and city lists for cleantech accelerators are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “cleantech accelerators”. 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 cleantech accelerators), 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 cleantech accelerators, and records with no verified work email.
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, 9,833 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 19, 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.

Cleantech accelerators by location

21 lists · largest first

Every Cleantech accelerators list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 cleantech accelerators, 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 cleantech accelerators are there worldwide?

RevenueBase identified 3,670 cleantech accelerators worldwide 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?

Team For The Planet, headquartered in Lyon, tops this list with the largest team on record.

Which country has the most cleantech accelerators?

The United States leads with 818 companies, followed by India (258) and the United Kingdom (247). Every cleantech accelerators list by country and city is linked on this page.

Which city has the most cleantech accelerators?

London leads with 130 headquartered companies, followed by New York (58) and San Francisco (54).

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 9,833 verified decision-maker contacts tracked across these 3,670 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 19, 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.