Company lists · Data refreshed September 2026

Top 25 Cleantech accelerators based in Germany

Name: Cleantech accelerators based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 124 companies tracked

RevenueBase identified 124 cleantech accelerators headquartered in Germany as of September 2026 and tracks 1,568 professional contacts across them, including 576 with verified work emails. Berlin is the largest hub.

This list covers cleantech accelerators headquartered in Germany, 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.

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

124Companies

1,568Contacts tracked

576Verified emails

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The 25 largest cleantech accelerators based in Germany

Ranked by team size

Top 25 of 124 cleantech accelerators based in Germany, 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	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
2	Pure Energy	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 19, 2026	51-200	81 contacts →
	Indirect evidence “Pure Energy is a private clean-tech organization focusing on commercial optimization of renewable & BESS assets, energy trading, origination, and "hands-on" advisory services.” Source: RevenueBase Database · checked Sep 19, 2026
3	Taprogge Gesellschaft MBH	Partial evidence	Wetter, GermanyHQ checked Sep 19, 2026	201-500	72 contacts →
	Partial evidence “TAPROGGE is a global cleantech specialist.” Source: RevenueBase Database · checked Sep 19, 2026
4	Zendure	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 19, 2026	201-500	64 contacts →
	Indirect evidence “Zendure is a global leader in providing reliable, affordable and accessible clean energy solutions for households worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
5	World Fund	Indirect evidence	Berlin, GermanyHQ checked Sep 19, 2026	11-50	53 contacts →
	Indirect evidence “We help to decarbonise the global economy.” Source: RevenueBase Database · checked Sep 19, 2026
6	Carbonfreed	Indirect evidence	Meldorf, GermanyHQ checked Sep 19, 2026	11-50	29 contacts →
	Indirect evidence “We are CarbonFreed.” Source: RevenueBase Database · checked Sep 19, 2026
7	Future Energy Ventures	Indirect evidence	Berlin, GermanyHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Future Energy Ventures is a unique venture capital and collaboration platform that brings together world-class start-ups and corporate partners to shape the future energy…” Source: RevenueBase Database · checked Sep 19, 2026
8	Respond	Indirect evidence	München, GermanyHQ checked Sep 19, 2026	1-10	18 contacts →
	Indirect evidence “RESPOND is the BMW Foundation’s global platform for entrepreneurs developing solutions that create environmental, economic, and societal impact.” Source: RevenueBase Database · checked Sep 19, 2026
9	Rootcamp	Indirect evidence	Hannover, GermanyHQ checked Sep 19, 2026	1-10	17 contacts →
	Indirect evidence “The RootCamp is an innovation hub for technology-oriented startups from the AgTech, Bioeconomy and Circular Economy sector.” Source: RevenueBase Database · checked Sep 19, 2026
10	Enerkii	Indirect evidence	Munich, GermanyHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “enerkii installs, finances and operates smart energy solutions for commercial and industrial customers.” Source: RevenueBase Database · checked Sep 19, 2026
11	Innowerft	Partial evidence	Walldorf, GermanyHQ checked Sep 19, 2026	11-50	14 contacts →
	Partial evidence “DER EARLY-STAGE INVESTOR UND STARTUP ACCELERATOR AUS WALLDORF Wir unterstützen frühphasige, innovative B2B Hightech Startups auf dem Weg zum erfolgreichen Unternehmen.” Source: RevenueBase Database · checked Sep 19, 2026
12	AHT Cleantec	Partial evidence	Bonn, GermanyHQ checked Sep 19, 2026	11-50	14 contacts →
	Partial evidence “AHT is a publicly traded, highly innovative CleanTec enterprise with three decades of engineering expertise and strong technology partners.” Source: RevenueBase Database · checked Sep 19, 2026
13	Sustainable Aero LAB	Indirect evidence	Hamburg, GermanyHQ checked Sep 19, 2026	1-10	14 contacts →
	Indirect evidence “A fast track program for ideas that aim to transition the aviation industry towards a sustainable future.” Source: RevenueBase Database · checked Sep 19, 2026
14	Protarget AG	Indirect evidence	Köln, GermanyHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “Protarget represents science and engineering excellence.” Source: RevenueBase Database · checked Sep 19, 2026
15	Startups For Tomorrow	Indirect evidence	Everywhere, GermanyHQ checked Sep 19, 2026	501-1,000	11 contacts →
	Indirect evidence “We unite startups that are committed to a better tomorrow with innovative products or more sustainable alternatives.” Source: RevenueBase Database · checked Sep 19, 2026
16	Impact HUB Stuttgart	Partial evidence	Stuttgart, GermanyHQ checked Sep 19, 2026	11-50	11 contacts →
	Partial evidence “The Impact Hub Stuttgart is a sustainability ecosystem, accelerator & co-working space for innovators driving sustainable change.#BetterBusiness # BetterFuture #Sustainability…” Source: RevenueBase Database · checked Sep 19, 2026
17	Algorismic Gmbh	Indirect evidence	Dresden, GermanyHQ checked Sep 19, 2026	11-50	10 contacts →
	Indirect evidence “algorismic is an innovative software startup that is committed to an environmentally friendly, low-emission industry.” Source: RevenueBase Database · checked Sep 19, 2026
18	Excitelab	Partial evidence	Dresden, GermanyHQ checked Sep 19, 2026	11-50	9 contacts →
	Partial evidence “ExciteLab is a deeptech accelerator in Dresden, established in collaboration with the Technische Universität Dresden (TUD), the TU Dresden Aktiengesellschaft (TUDAG), and SpinLab…” Source: RevenueBase Database · checked Sep 19, 2026
19	Blue Activity	Partial evidence	Heidelberg, GermanyHQ checked Sep 19, 2026	1-10	5 contacts →
	Partial evidence “Blue Activity GmbH is a CleanTech company redefining industrial water treatment, replacing environmentally harmful biocides and petroleum-based chemicals with the power of nature.” Source: RevenueBase Database · checked Sep 19, 2026
20	Seedhouse	Partial evidence	Osnabrück, GermanyHQ checked Sep 19, 2026	11-50	5 contacts →
	Partial evidence “Das Accelerator-Programm hilft Gründerteams in wenigen Monaten von der Idee zur Marktreife.” Source: RevenueBase Database · checked Sep 19, 2026
21	Statkraft Ventures	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 19, 2026	11-50	5 contacts →
	Indirect evidence “SK Ventures is a leading venture capital investor focused on the energy transition and climate tech.” Source: RevenueBase Database · checked Sep 19, 2026
22	Fokus.Energie E.V	Indirect evidence	Karlsruhe, GermanyHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “fokus.energie is an initiative of committed companies and entrepreneurs.” Source: RevenueBase Database · checked Sep 19, 2026
23	Wissenschaftspark Gelsenkirchen Science Park	Indirect evidence	Gelsenkirchen, GermanyHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “Clean technologies" take the place of coal and steel.” Source: RevenueBase Database · checked Sep 19, 2026
24	Path To Zero Gmbh	Indirect evidence	Karlsruhe, GermanyHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “Path to Zero is a high-tech startup supporting the decarbonization of industrial and commercial companies by providing the necessary decision-making basis to enable future-proof…” Source: RevenueBase Database · checked Sep 19, 2026
25	AEN	Partial evidence	Karlsruhe, GermanyHQ checked Sep 19, 2026	1-10	4 contacts →
	Partial evidence “AEN is an accelerator of innovations.” 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 124 cleantech accelerators based in Germany

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Cleantech accelerators based in Germany at a glance

As of Sep 19, 2026

36.7%Verified-email coverage

12.6Average contacts per company

1-10Median size (employees)

24.2%Largest-city concentration · Berlin

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 124 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 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.
What qualifies: Companies headquartered in Germany 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. Companies headquartered outside Germany 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, 576 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 metro

Cleantech accelerators in Berlin30

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 based in Germany?

RevenueBase identified 124 cleantech accelerators headquartered in Germany 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?

Sonnen Gmbh, headquartered in Wildpoldsried, tops this list with the largest team on record.

Which city has the most cleantech accelerators?

Berlin leads with 30 headquartered companies, followed by Munich (7) and Dusseldorf (6).

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 576 verified decision-maker contacts tracked across these 124 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.