Top 5 Green Energy startups in Helsinki
Nov 06, 2025
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26
1
Funding: €35.5M
Cactos develops distributed energy storage systems based on recycled EV batteries. The energy storage units are made from re-used Tesla EV batteries, making them one of the market’s most environmentally friendly energy storage units.
Cactos develops distributed energy storage systems based on recycled EV batteries. The energy storage units are made from re-used Tesla EV batteries, making them one of the market’s most environmentally friendly energy storage units.
2
Funding: €5.8M
BroadBit Batteries is developing revolutionary new batteries using novel sodium-based chemistries to power the future green economy.
BroadBit Batteries is developing revolutionary new batteries using novel sodium-based chemistries to power the future green economy.
3
Funding: €2.8M
Synergi is on a mission to make electricity consumption smart and controllable for households, giving Europeans more power over their energy bills and emission output and balancing the electricity grid.
Synergi is on a mission to make electricity consumption smart and controllable for households, giving Europeans more power over their energy bills and emission output and balancing the electricity grid.
4
Funding: $2.4M
Geyser Batteries offers high-power heavy-duty energy storage solutions based on novel proprietary water-based electrolyte and unique engineering and manufacturing know-how.
Geyser Batteries offers high-power heavy-duty energy storage solutions based on novel proprietary water-based electrolyte and unique engineering and manufacturing know-how.
5
Funding: $125K
Kapacity.io service connects remotely to buildings through building management systems to adjust HVAC energy consumption in real time using AI machine learning to optimize and find the best ways to consume electricity.
Kapacity.io service connects remotely to buildings through building management systems to adjust HVAC energy consumption in real time using AI machine learning to optimize and find the best ways to consume electricity.
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