Estonia is recognised as one of the world’s most advanced digital societies, but it is also one of the greenest countries in Europe, with forests covering nearly half of its landmass. This dualitywhere there is deep reverence for nature combined with extreme technical capability, gave rise to a unique Climate Tech ecosystem.
Estonian founders are engineering the materials, financing models, and energy grids of the future. From turning sheep wool into packaging to converting CO2 into battery graphite, the “Green Tiger” economy is defined by pragmatic, scalable deep tech.
Here are the 10 Climate and ESG startups in Estonia you need to watch in 2026.
Skeleton Technologies
Taavi Madiberk and Oliver Ahlberg founded Skeleton Technologies to boost power density in energy storage. They manufacture ultracapacitors using proprietary curved graphene to enable rapid charging in seconds. The company has raised over €300 million and partnered with automotive giants to lead the European energy storage market. Their technology captures wasted energy from braking systems and redeploys it instantly to increase efficiency across heavy industry.
Single.Earth
Merit Valdsalu and Andrus Aaslaid founded Single.Earth to financialise nature without logging. They tokenise the ecological value of forests and create a digital twin of planetary health. The platform compensates landowners for preserving forests to absorb carbon and maintain biodiversity, rather than selling timber. This hybrid of deep tech and crypto utilises satellite imagery to verify carbon sequestration in real-time.
Woola
Anna-Liisa Palatu founded Woola to replace plastic bubble wrap with sheep wool. The company utilises coarse wool, often discarded as waste, to create shockproof, compostable packaging envelopes. They scale rapidly by supplying major e-commerce retailers and luxury brands needing sustainable shipping solutions. This business model converts a waste stream into a valuable resource, thereby eliminating plastic pollution.
eAgronom
Robin Saluoks built eAgronom to digitise agriculture and incentivise decarbonization. The platform helps farmers adopt sustainable practices and verifies carbon sequestered in the soil. It generates high-quality carbon credits that farmers can sell to finance their transition to regenerative farming. Backers like Swedbank support their mission to provide the financial bridge for traditional agriculture.
Reverse Resources
Ann Runnel founded Reverse Resources to track textile waste from factories to recyclers. The SaaS platform creates a transparent supply chain for the circular economy by digitising the flow of leftover fabric. This enables major brands like H&M to effectively reintegrate recycled materials into their production lines. Their work helps global fashion brands comply with new EU regulations on textile waste.
Sunly
Priit Lepasepp founded Sunly to operate as an independent power producer for the Baltics and Poland. The agile developer focuses on solar and onshore wind parks, with a strong emphasis on deep community engagement. They recently raised capital to accelerate a pipeline that includes battery storage integration for grid stabilisation. Sunly demonstrates that renewable energy development can be achieved more efficiently through decentralised models than through state monopolies.
Roofit.solar
Andri Jagomägi founded Roofit.solar to merge Nordic design with energy generation. They manufacture durable steel roofing modules with photovoltaic cells integrated directly inside. The result is a sleek black metal roof that generates electricity while maintaining aesthetic integrity. This approach appeals to homeowners in Scandinavia and Germany who want net-zero living without compromising on curb appeal.
UP Catalyst
Gary Urb founded UP Catalyst to secure local battery raw materials for Europe. The company uses electrolysis to capture CO2 emissions from heavy industry and transform them into sustainable carbon nanomaterials. These graphite materials serve as critical components for electric vehicle batteries. The process decarbonizes industry while reducing reliance on mining in geopolitically unstable regions.
Grünfin
Triin Hertmann and Karin Nemec created Grünfin to make sustainable investing accessible. The platform curates ETF portfolios that strictly adhere to EU sustainable finance regulations to filter out greenwashing. It allows retail investors to align savings with values like climate change or gender equality without needing financial expertise. They democratize impact investing and prove retail capital is a powerful force for corporate change.
R8 Technologies
Siim Täkker founded R8 Technologies to manage commercial real estate energy. Their AI connects to existing HVAC systems in large office buildings to tweak settings autonomously based on energy prices and occupancy. The system reduces energy consumption by up to 20 percent without human intervention. They manage over 3 million square meters of commercial space and help real estate funds meet strict ESG targets.
