OnZero: Sipoo Söderkulla
OnZero operates a modular, liquid-cooled data center built from shipping containers at Keravan Energia's heating plant in Söderkulla, Sipoo. Its waste heat feeds the Söderkulla district heating network.
OnZero
OnZero is headquartered in Vienna, Austria, and develops what it calls AI Heat Factories: liquid-cooled data centers that recover up to 99% of compute heat into district heating networks. Its Finnish subsidiary, OnZero Finland Oy, was formerly Blockbase Finland Oy, and the founders previously ran the mining-as-a-service firm Blockbase. OnZero operates in Finland at Söderkulla in Sipoo and in Kemijärvi.
OnZero History:
- In August 2026, OnZero agreed with Helen to supply recovered AI compute heat to Helsinki's district heating network.
- In November 2025, OnZero's container data center at Söderkulla, Sipoo, entered service.
- In August 2024, Blockbase Finland Oy was renamed OnZero Finland Oy.
OnZero Data Center Map
OnZero Power Growth Over Time
+0%
since 2022
Operational
Construction
Planned
Prospective
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Planned / Prospective
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sites announced, but haven't started construction
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