Observed Signal · Mar 17, 2026 · Partnership · Source: Trending Topics · Impact: 2/5 · Sentiment: Positive
Vienna's OnZero to Supply AI Heat to Helsinki District Heating
OnZero Finland Oy, a subsidiary of Vienna-based OnZero Alpha Holdings GmbH, has signed an agreement with Helsinki-owned utility Helen Oy to feed up to 525,000 MWh of recovered waste heat per year from its planned 'AI Heat Factory' into Helsinki's district heating network. The liquid-cooled facility is designed to recover up to 99 percent of the heat generated by AI compute workloads and to operate without on-site water consumption. Commissioning is expected next year. The project builds on OnZero's existing Finnish sites in Kemijärvi and Kerava, which have delivered roughly 30,700 MWh of heat. The company generates revenue from AI and blockchain compute, heat sales, and grid stabilization services. Helen, which has used data center waste heat since 2010, aims to end combustion-based energy production by 2040.
The agreement reflects a growing trend of AI data center operators integrating with urban energy infrastructure, relevant to the sustainability and cost structure of AI compute used across AdTech and MarTech.
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Key Takeaways & Evidence Grounding
- OnZero Finland Oy signed a heat supply contract with Helsinki-based energy company Helen Oy.
- The planned 'AI Heat Factory' will supply up to 525,000 MWh of heat per year, covering the needs of about 70,000 Helsinki apartments.
- The facility uses liquid-cooled architecture designed to recover up to 99% of waste heat from AI compute.
- OnZero's existing plants in Kemijärvi and Kerava have delivered around 30,700 MWh of heat so far.
- Helen Oy has contracted data center waste heat since 2010, including agreements with Equinix.
Connected Companies & Entities
1 Entity mapped“The utility has been using waste heat from data centers since 2010 and has signed contracts with Equinix among others....”
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