Best Sustainability Tech Companies in Brussels, Belgium
The 31 best Sustainability Tech companies in Brussels, Belgium in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Sirona Technologies.
Our analysis of 293 Sustainability Tech companies
$38.4b in tracked funding; 83% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Sustainability Tech companies in Brussels
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Sirona Technologies Provider of carbon removal services | $6M | 28 mo ago | Seed | Thoralf Gutierrez Co-Founder & CEO | 2022 | WebflowGSAPLeadfeeder+14 | — | — |
| 2 | European Microfinance Network connecting microfinance institutions and social finance organizations. | $6M | 34 mo ago | Funding Raised | — | 2003 | WordPressTypeScriptPHP+29 | — | — |
| 3 | Shayp Provider of water leakage detection solution | $2M | 71 mo ago | Seed | Gregoire De Hemptinne Co-founder and Managing director | 2017 | — | 3 patents Water leak detection systems for pipelines and building plumbing | — |
| 4 | Companion.energy Energy management software | $2M | 29 mo ago | Seed | Thomas Vyncke Co-Founder | 2022 | WebflowGSAPAzure+29 | — | — |
| 5 | Ethernetics Provider of solutions to automate data center operations | $2M | 40 mo ago | Seed | Jan Dezutter Co-Founder | 2019 | — | 8 patents Optimized power distribution units for multi-PSU data center rack equipment | — |
| 6 | Enersee AI-driven platform designed for energy managers to optimize energy utilization | $1M | 14 mo ago | Seed | Maarten Van De Vijver Founder & CTO | 2021 | WebflowApple iCloud MailMicrosoft 365+21 | — | — |
| 7 | 24SEA Offshore monitoring and engineering service provider | $543K | 37 mo ago | Funding Raised | Freek Couttenier Co-Founder | 2011 | — | — | — |
| 8 | Zensor IoT-based monitoring for industrial assets | $280K | 44 mo ago | Seed | Yves Van Ingelgem Founder | 2013 | Cart FunctionalityStrikinglyNginx+23 | 6 patents Smart sensor-based structural health monitoring and strain detection for fastened mechanical joints | — |
| 9 | 3E Software solutions provider in the renewable energy sector | — | 43 mo ago | Funding Raised | Usha Poornima Founder | 1999 | Webflowcore-jsjQuery+15 | — | — |
| 10 | ImmoPass Provider of technical auditing services of properties | — | 76 mo ago | Seed | Guilmot Marc Co-Founder & CEO | 2018 | PHPYouTubeBootstrap+16 | — | — |
| 11 | haulogy SaaS-based meter data management & customer information systems | — | 104 mo ago | Series B | — | 2005 | WordPressApple iCloud MailGoogle Workspace+22 | — | — |
Top 12 Sustainability Tech companies in Brussels
#1
Seed · Brussels, Brussels · founded 2021 · 5 employees$1.3Mraised▾
AI-driven platform designed for energy managers to optimize energy utilization. It helps detect issues, identify improvement areas, and make informed decisions.
- Sep 2025Seed$4.7M
- Jun 2023Seed$1.3M
#2
Seed · Brussels, Brussels · founded 2022$6.4Mraised▾
Provider of carbon removal services. It provides services to fight climate change by removing carbon from the air with a low capex design and scalable DAC technology.
- Jun 2024Seed$6.4M
#3
Funding Raised · Brussels · founded 2003$5.8Mraised▾
Network connecting microfinance institutions and social finance organizations. It cultivates collaboration, encourages innovation, and facilitates knowledge sharing across the microfinance ecosystem. The network partners with institutions and corporations to implement projects. It also developed a code of conduct to ensure standards in microfinance operations and protect clients’ interests. The network strengthens involvement through working groups, workshops, research papers, publications, and tools for microfinance management.
- Jan 2024Grant (prize money)$594.5K
- Jan 2023Grant (prize money)$499K
- Feb 2022Grant (prize money)$188K
- Jan 2022Grant (prize money)$523.3K
#4
Seed · Brussels, Brussels · founded 2022 · 2 employees$2.3Mraised▾
Energy management software. The software combines financial and operational data to forecast energy costs and optimize energy usage.
- May 2024Seed$2.3M
- 2023Seed—
#5
Seed · Brussels, Brussels · founded 2019 · 9 employees$1.6Mraised▾
Ethernetics provides solutions to automate data centre operations. It also provides dashboards based on measurement data. It uses machine learning and artificial intelligence technology to implement predictive maintenance of server power supplies, UPS and backup batteries. It also provides solutions for lower power cost, reduction of the total cost of ownership, and for certifications.
- Jun 2023Seed$1.6M
#6
Funding Raised · Brussels, Brussels · founded 2011$542.7Kraised▾
Offshore monitoring and engineering service provider. Offers testing, inspection services and develops short & long-term energy and health monitoring systems for offshore turbine structures. With core expertise in data analysis, offers solutions for structural dynamics, signal processing, system identification, and health monitoring using data mining techniques. Also, involved in the commissioning and decommissioning of the offshore turbine structures.
- Oct 2023Grant (prize money)$542.7K
#7
Seed · Brussels, Brussels · founded 2017 · 18 employees$2.4Mraised▾
Provider of water leakage detection solution. It enables users to control the water bill and detect leakage in real time. It provides patented technology with the help of machine learning water consumption is measured, and water leaks are detected and reported through the Shayp router via an instant alert.
- Dec 2020Seed$2.3M
- Sep 2018Seed$58K
- Conventional Debt$220.5K
#8
Seed · Brussels, Brussels · founded 2013 · 12 employees$280.1Kraised▾
Zensor offers an innovative technology to accurately detect anomalies and keep an eye on the functioning of assets. They serve enterprises in verticals like renewables, civil infrastructure, oil gas, and pipelines.
- Mar 2023Grant (prize money)$280.1K
- Mar 2017Angel—
#9
Funding Raised · Brussels, Brussels · founded 1999—raised▾
Software solutions provider in the renewable energy sector. It provides software and consultancy services to the renewable energy sector. Developed a proprietary monitoring software called SynaptiQ, that monitors, reports and claims to improve the performance of solar and wind projects.
#10
Seed · Brussels, Brussels · founded 2018—raised▾
Immopass provides technical auditing services for properties for property owners and managers. Property buyers and managers can use its services to assess the condition of the property to avoid unexpected renovation costs.
- Jun 2020Seed—
#11
Series B · Brussels, Brussels · founded 2005 · 82 employees—raised▾
haulogy provides SaaS-based meter data management & customer information systems to grid operators and utility service providers in gas and power market. Has features like customer interaction, invoice generation, customer information databased, grid management, and others. Claims to send around 100M messages yearly to customers by users and issue 3.5M invoices to end-customers in 2016. Has more than 35 customers in its portfolio including belpower, Elexys, Total, Brussels AIrport, and others, as of Mar'18.
- Mar 2018Series B—
#12
Deadpooled · Brussels, Brussels · founded 2013 · 3 employees—raised▾
You Know Watt offers energy data analytics and non-intrusive load monitoring tools to engage commercial and residential consumers for utilities. Appliance signatures are recognised without the need to add intelligence or measuring hardware to the appliance. Consumption data is sent to the YKW-servers where algorithms distinguish the different appliances and their respective consumption.
- Jun 2015Series B—
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Sustainability Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Climate Adaptation is moving in Belgium
A read on the academic research around Climate Adaptation — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 112 Belgium-affiliated papers.
- University of Antwerp19
- KU Leuven14
- Vrije Universiteit Brussel10
- Flemish Institute for Technological Research7
- European Commission6
- Climate change3
- Green infrastructure2
- Bond2
- Project finance2
- Investment (military)2
- Flood myth3→14
- Resilience (materials science)1→4
- Climate change2→30
- Psychological resilience1→10
- Resilience (materials science)1→7
- Flood myth1→5
Where climate adaptation is researched across Belgium
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.