Company lists · Data refreshed September 2026

Top 25 Cleantech companies based in Belgium

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 164 companies tracked

RevenueBase identified 164 cleantech companies headquartered in Belgium as of September 2026 and tracks 2,802 professional contacts across them, including 1,306 with verified work emails. Brussels is the largest hub.

This list covers cleantech companies headquartered in Belgium, 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

164Companies

2,802Contacts tracked

1,306Verified emails

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The 25 largest cleantech companies based in Belgium

Ranked by team size

Top 25 of 164 cleantech companies based in Belgium, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to cleantech 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	VITO	Strong evidence	Mol, BelgiumHQ checked Sep 19, 2026	1,001-5,000	1,117 contacts →
	Strong evidence “VITO is an independent Flemish research organisation in the area of cleantech and sustainable development.” Source: RevenueBase Database · checked Sep 19, 2026
2	Eneco Belgium	Indirect evidence	Mechelen, BelgiumHQ checked Sep 19, 2026	201-500	250 contacts →
	Indirect evidence “Eneco Belgium is a sustainable energy provider.” Source: RevenueBase Database · checked Sep 19, 2026
3	Smappee	Indirect evidence	Harelbeke, BelgiumHQ checked Sep 19, 2026	51-200	120 contacts →
	Indirect evidence “Smappee is an energy technology company.” Source: RevenueBase Database · checked Sep 19, 2026
4	CEE	Strong evidence	Hamme-mille, BelgiumHQ checked Sep 19, 2026	11-50	78 contacts →
	Strong evidence “CEE is a cleantech company that guides energy-intensive frontrunners to net zero in their industrial production processes.” Source: RevenueBase Database · checked Sep 19, 2026
5	Energyking	Indirect evidence	Herent, BelgiumHQ checked Sep 19, 2026	51-200	53 contacts →
	Indirect evidence “EnergyKing werd in 2013 opgericht door twee ingenieurs: Lucas & Wiet.” Source: RevenueBase Database · checked Sep 19, 2026
6	Broptimize Energy	Indirect evidence	Remicourt, BelgiumHQ checked Sep 19, 2026	51-200	51 contacts →
	Indirect evidence “Fondée en 2016 par deux frères, Sébastien et Michael Menu et issue de l'Université de Liège, Broptimize est aujourd'hui la référence en matière d'accompagnement dans la transition…” Source: RevenueBase Database · checked Sep 19, 2026
7	MR Solar	Indirect evidence	Zwevegem, BelgiumHQ checked Sep 19, 2026	51-200	51 contacts →
	Indirect evidence “Efficiency Thanks to our advice focused on a sustainable ecosystem, we offer our customers a tailor-made energy solution, resulting in optimal efficiency in both the near and…” Source: RevenueBase Database · checked Sep 19, 2026
8	Linea Trovata Group	Indirect evidence	Lokeren, BelgiumHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “Zonnepanelen, batterijen, laadinfrastructuur slimme sturingen en warmte- en koeloplossingen?” Source: RevenueBase Database · checked Sep 19, 2026
9	Insaver	Indirect evidence	Houthalen, BelgiumHQ checked Sep 19, 2026	51-200	45 contacts →
	Indirect evidence “At Insaver, we guide you every step of the way toward a low-carbon future.” Source: RevenueBase Database · checked Sep 19, 2026
10	Energreen	Indirect evidence	BelgiumHQ checked Sep 19, 2026	501-1,000	37 contacts →
	Indirect evidence “We believe in the impact and power of energy within the green and sustainable environment, lived and realised by people and community.” Source: RevenueBase Database · checked Sep 19, 2026
11	Greenwin	Strong evidence	Gosselies, BelgiumHQ checked Sep 19, 2026	11-50	36 contacts →
	Strong evidence “GreenWin : Accélérer l'innovation dans les CleanTech dans les secteurs de la chimie, de la construction et de l’environnement pour une société prospère et durable #GreenWin, pôle…” Source: RevenueBase Database · checked Sep 19, 2026
12	Enerdeal By EDP	Indirect evidence	Zaventem, BelgiumHQ checked Sep 19, 2026	11-50	33 contacts →
	Indirect evidence “Enerdeal by EDP supports industrial and public players in their energy transition, turning solar energy into a strategic lever for performance, sustainability and independence.” Source: RevenueBase Database · checked Sep 19, 2026
13	Coretec Energy	Indirect evidence	Angleur, BelgiumHQ checked Sep 19, 2026	11-50	26 contacts →
	Indirect evidence “ACTIVITÉS ET PRODUITS CORETEC, votre partenaire vers une gestion durable et performante de votre énergie, a comme principal objectif de réduire la facture énergétique et donc…” Source: RevenueBase Database · checked Sep 19, 2026
14	Co2logic, A South Pole Company	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “CO2logic joined the South Pole Group in 2021, forming the world’s largest climate solutions provider and carbon project developer.” Source: RevenueBase Database · checked Sep 19, 2026
15	We Green Belgium	Indirect evidence	Zaventem, BelgiumHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “We Green vise à réduire la dépendance de ses clients aux sources d'énergie non-durables afin de diminuer leurs émissions de carbone via des solutions énergétiques vertes et…” Source: RevenueBase Database · checked Sep 19, 2026
16	Helexia Belgium	Indirect evidence	Antwerpen, BelgiumHQ checked Sep 19, 2026	201-500	23 contacts →
	Indirect evidence “Helexia is your all-in-one partner for accelerating your energy transition.” Source: RevenueBase Database · checked Sep 19, 2026
17	cozie.be	Indirect evidence	België, BelgiumHQ checked Sep 19, 2026	51-200	23 contacts →
	Indirect evidence “Cozie \| Durable Comfort Cozie is a vibrant company that works with ENGIE to combine the energy and dynamism of a start-up with the technical competence & long-term vision of an…” Source: RevenueBase Database · checked Sep 19, 2026
18	ENSYS	Indirect evidence	Kapellen, BelgiumHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “As specialists in the field of renewable energy and energy efficiency, we offer unique proposals to both individuals and businesses.” Source: RevenueBase Database · checked Sep 19, 2026
19	Polarsun	Indirect evidence	Barchon, BelgiumHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Chez Polarsun, nous concevons, installons et assurons le suivi de solutions énergétiques durables pour les particuliers, les entreprises et les collectivités.” Source: RevenueBase Database · checked Sep 19, 2026
20	Go-Solar By D'ieteren	Indirect evidence	Waasmunster, BelgiumHQ checked Sep 19, 2026	51-200	19 contacts →
	Indirect evidence “Bij Go-Solar by D'Ieteren gaan wij verder dan alleen de installatie van zonnepanelen.” Source: RevenueBase Database · checked Sep 19, 2026
21	Verisol	Strong evidence	Lummen, BelgiumHQ checked Sep 19, 2026	11-50	19 contacts →
	Strong evidence “Verisol is an expert in the installation of cleantech products including photovoltaic solar installations, solar thermal systems, heat pumps, airconditioning systems, isolation en…” Source: RevenueBase Database · checked Sep 19, 2026
22	Wattson NV	Indirect evidence	Ghent, BelgiumHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “Wattson maakt van gebouwen de gangmakers van de energietransitie.” Source: RevenueBase Database · checked Sep 19, 2026
23	Eoluz NV	Indirect evidence	Kapellen, BelgiumHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “Eoluz bouwt vandaag aan de energie van morgen.” Source: RevenueBase Database · checked Sep 19, 2026
24	Matriciel	Indirect evidence	Louvain-la-neuve, BelgiumHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence “L'activité de la société MATRIciel vise une MEILLEURE PERFORMANCE ENERGETIQUE ET ENVIRONNEMENTALE DES BATIMENTS dans le cadre du développement durable par une participation active…” Source: RevenueBase Database · checked Sep 19, 2026
25	TOQUA	Indirect evidence	Ghent, BelgiumHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Toqua is a maritime deep-tech startup that accelerates the decarbonization of the shipping industry by harnessing the power of big data & AI.” 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 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 cleantech companies.
Partial evidence: Its own public description names part of cleantech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cleantech 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 164 cleantech companies based in Belgium

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Cleantech companies based in Belgium at a glance

As of Sep 19, 2026

46.6%Verified-email coverage

17.1Average contacts per company

1-10Median size (employees)

7.3%Largest-city concentration · Brussels

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

105

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for Belgium, so it is reported there. Company counts and contact totals on this page are exact for Belgium, over 164 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 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 Belgium whose own description of what they do matches “cleantech 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 cleantech 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 cleantech companies, and records with no verified work email. Companies headquartered outside Belgium 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, 1,306 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.

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 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 cleantech companies are there based in Belgium?

RevenueBase identified 164 cleantech companies headquartered in Belgium 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?

VITO, headquartered in Mol, tops this list with the largest team on record.

Which city has the most cleantech companies?

Brussels leads with 12 headquartered companies, followed by Antwerpen (6) and Ghent (5).

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 1,306 verified decision-maker contacts tracked across these 164 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.