Top 9 Green Energy startups in Tallinn
Feb 28, 2026
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15
1
Funding: €63.7M
Stargate Hydrogen Solutions offers turn-key electrolysis solutions for the production of green hydrogen with renewable energy.
Stargate Hydrogen Solutions offers turn-key electrolysis solutions for the production of green hydrogen with renewable energy.
2
Funding: €313.3M
Skeleton Technologies is a manufacturer and developer of high energy and power density ultracapacitors.
Skeleton Technologies is a manufacturer and developer of high energy and power density ultracapacitors.
3
Funding: $145M
Elcogen manufactures solid oxide (SOC) fuel cells and complete solid oxide stack modules called elcoStack. These modules consist of a compression system, gas manifolds and air distribution structure. Solid oxide fuel cells produce electricity and heat (a byproduct) through an electrochemical process from hydrogen or hydrogen-containing fuel. Modules for one and four stacks are available. The company provides a full range of services, from design to on-site project support. Elcogen also creates solid oxide electrolytic cells that produce hydrogen through an electrochemical process from water and electricity. Their electrolysis system includes various components for steam and hydrogen distribution, thermal management, energy conversion, control and more.
Elcogen manufactures solid oxide (SOC) fuel cells and complete solid oxide stack modules called elcoStack. These modules consist of a compression system, gas manifolds and air distribution structure. Solid oxide fuel cells produce electricity and heat (a byproduct) through an electrochemical process from hydrogen or hydrogen-containing fuel. Modules for one and four stacks are available. The company provides a full range of services, from design to on-site project support. Elcogen also creates solid oxide electrolytic cells that produce hydrogen through an electrochemical process from water and electricity. Their electrolysis system includes various components for steam and hydrogen distribution, thermal management, energy conversion, control and more.
4
Funding: €16.8M
Roofit.solar makes integrated solar roofs that combine the traditional Nordic metal roof design with cutting-edge solar technology.
Roofit.solar makes integrated solar roofs that combine the traditional Nordic metal roof design with cutting-edge solar technology.
6
Funding: €6.3M
Gridraven specializes in optimizing grid capacity using AI-powered Dynamic Line Rating technology, eliminating the need for additional hardware.
Gridraven specializes in optimizing grid capacity using AI-powered Dynamic Line Rating technology, eliminating the need for additional hardware.
7
Funding: €4.2M
Gridio is aiming to help people adjust electricity consumption so they can save money and energy
Gridio is aiming to help people adjust electricity consumption so they can save money and energy
8
Funding: €2.4M
R8 Digital Operator develops artificially intelligent add-on software for your existing Building Automation System (BAS, BMS).
R8 Digital Operator develops artificially intelligent add-on software for your existing Building Automation System (BAS, BMS).
9
Spiral Hydrogen is developing a groundbreaking hydrogen production unit that combines the entire hydrogen generation process—from converting mechanical energy into electrical energy to driving the electrochemical reactions for hydrogen production—into a single, efficient system.
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