Best Sustainability Tech Companies in Tallinn, Estonia
The 65 best Sustainability Tech companies in Tallinn, Estonia in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Arbonics.
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 Tallinn
| # | Company | Revenue | Disclosed funding | Employees | Founded | Founder | Tech stack | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | Dussmann Service Cloud-based energy management solution for facility management | $16M FY2022 | — | 557 | 1986 | — | — | — |
| 2 | DeltaE Provider of energy and resource efficiency solutions for businesses. | $3M FY2022 | — | 32 32 → 23 (-28%) | 2013 | — | WordPressMySQLPHP+31 | — |
| 3 | Airexa Provider of ventilation, cooling, and HVAC systems | $1M FY2023 | — | 1 | 2018 | Ingrid Salk Founder / CEO at Airexa OÜ | — | — |
| 4 | Zerofy Online platform to measure and offset the carbon footprint | $689K FY2023 | $1M | 2 | 2022 | Till Quack Co-Founder | FirebaseYouTubeBootstrap+29 | 1 launch |
| 5 | Kwota Provider of CO2 emission savings services | $559K FY2022 | $2M | 8 | 2021 | Argo Rannamets Founder | — | — |
| 6 | Brightlux Group Provider of LED lighting solution | $552K FY2023 | — | 2 | 2014 | Jost Sisask CEO | — | — |
| 7 | LogFoot Developer of affordable houses | $425K FY2023 | — | 2 | — | — | WordPressMySQLPHP+14 | — |
| 8 | Hepta Insights Provider of smart power line inspection solutions | $372K FY2022 | $3M | 7 | 2013 | Siim Heering Co-Founder | — | — |
| 9 | AirPatrol Developer of smart connected devices for homes | $360K FY2023 | — | 2 | 2011 | Daniel Dordett Founder & CEO | — | — |
| 10 | Selfdiagnostics Provider of point-of-care tests for infectious diseases | $319K FY2023 | $407K | 17 | 2008 | Indrek Tulp Founder & CTO | — | — |
Top 12 Sustainability Tech companies in Tallinn
#1
Seed · Tallinn, Harju County · founded 2023$4.6Mraised▾
Soldera unifies the world's fragmented renewable energy certificate registries into a single platform. Companies and producers access Guarantees of Origin, I-RECs, and other Energy Attribute Certificates across all jurisdictions through one virtual account, eliminating the need to navigate dozens of separate national registries. The platform automates compliance workflows for GHG Protocol, RE100, and CSRD, provides transparent pricing from 4,000+ aggregated producers, and delivers audit-ready retirement documentation. For producers, Soldera automates registry interactions and maximizes certificate revenues through aggregated tenders and forward trading strategies.
- Jan 2026Seed$1.9M
- Mar 2025Seed$2.7M
#2
Seed · Tallinn, Harju County · founded 2023$626Kraised▾
Developer of a wearable biosensor for precise ovulation tracking. This device measures sex hormones to provide detailed cycle information via a phone app, aiding women experiencing fertility challenges. The self-applied sensor is designed for ease of use and comfort. The aim is to improve the accuracy and convenience of ovulation tracking for women seeking to conceive.
- Nov 2025Seed$626K
#3
Seed · Tallinn, Harju County · founded 2023$4.2Mraised▾
Provider of software-based dynamic line ratings for power grid optimization. It provides users with solutions that rethinks how existing power grids are utilized, making them smarter and more adaptable. It enhances the capacity of overhead lines without requiring new infrastructure, which assists in alleviating bottlenecks, reducing costs, and expediting grid expansion for operators, producers, and consumers. The solution leverages precision weather forecasting and hyper-local weather artificial intelligence, ensuring high accuracy, resolution, and availability, while identifying critical spans and implementing ratings across all lines.
- Feb 2025Seed$4.2M
#4
Seed · Tallinn, Harju County · founded 2014 · 20 employees$3.6Mraised▾
Provider of solutions for virtual power plant management. It integrates consumers and energy systems to enable better integration of renewables and reduce CO2. It also provides solutions for virtual power plants, demand response, and revenue management.
- Jan 2025Seed$2.7M
- Dec 2022Seed$3.6M
- 2021Seed—
#5
Seed · Tallinn, Harju County · founded 2019 · 4 employees$348.1Kraised▾
AI-powered energy optimizer for solar panels and batteries. It automatically selects the best energy source hourly—buying low, selling high, storing smart, or activating grid flexibility services—factoring in market prices, home use, and solar production.
- Oct 2025Seed$348.1K
#6
Seed · Tallinn, Harju County · founded 2018 · 9 employees$978.4Kraised▾
Developer of application that automates electric vehicle charging based on tariffs. The application connects to car manufacturer cloud services, enabling smart charging based on energy prices and solar power availability. It integrates with various car brands and solar inverters, offering users control over charging schedules. The application aims to save users money and reduce carbon footprint.
- Jan 2025Seed$2.5M
- Oct 2022Seed$978.4K
- Dec 2019Seed—
#7
Seed · Tallinn, Harju County · founded 2022$7.7Mraised▾
Provider of forest carbon project planning and carbon credit marketplace. It offers tools for landowners to manage forests for carbon removal. The company develops data models to monitor forest growth. It facilitates the generation of forest carbon income.
- Dec 2023Seed$5.9M
- Sep 2022Seed$1.8M
#8
Seed · Tallinn, Harju County · founded 2013 · 7 employees$2.6Mraised▾
Provider of smart power line inspection solutions. It provides end-to-end inspection solution for large networks from smart software and rich analytics to hands-on support from specialists and hardware facilitation. It offers features such as AI-driven defect detection, overview of the state of your grid, and more.
- Feb 2024Seed—
- Feb 2021Seed$2.4M
- Jul 2020Seed$159.4K
- Jun 2019Grant (prize money)$470.3K
#9
Seed · Tallinn, Harju County · founded 2015 · 1 employees$1.4Mraised▾
Provider of smart thermostats. It offers Themo - digital thermostat which takes into account real-time electricity spot price, outside weather, preset temperature levels, and the unique consumption profile.
- Mar 2024Seed$1.4M
- 2016Grant (prize money)$4.7K
#10
Seed · Tallinn, Harju County · founded 2018 · 8 employees$2.9Mraised▾
Provider of solutions for automated plastic waste collection. It provides smart waste kiosks to collect plastic bottles.
#11
Seed · Tallinn, Harju County · founded 2015 · 12 employees$1.4Mraised▾
Provider of solution to minimize CO2 emissions and carbon footprint. It specializes in developing patented clean energy conversion technologies. It focus on increasing the combustion efficiency of natural gas and hydrogen.
- Nov 2023Angel$1.4M
- Nov 2023Grant (prize money)$3.5M
- May 2019Grant (prize money)$56K
#12
Seed · Tallinn, Harju County · founded 2017 · 43 employees$1.1Mraised▾
Provider of IoT-based platform for building automation. It provides a software-based control system (R8 system) for building automation to decrease the energy consumption of commercial properties. The big data and machine learning-based control logic rely on real-time building behavior, weather, and energy market fluctuations to provide optimal insights for reducing energy consumption. The system also includes an interactive customer-focused dashboard for valuable performance analysis with fault detection. It caters to shopping centers, office buildings, and hotels.
- Oct 2023Seed—
- Jan 2021Seed$1.1M
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 Estonia
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 27 Estonia-affiliated papers.
- Stockholm Environment Institute19
- Ministry of Agriculture2
- Ministry of Culture2
- Tallinn University2
- Ministry of the Environment1
- Climate change4
- Resilience (materials science)3
- Flood myth3
- Sustainability3
- Climate resilience3
- Climate change3→5
Where climate adaptation is researched across Estonia
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.