Observed Signal · Apr 9, 2025 · Partnership · Source: Trending Topics · Impact: 2/5 · Sentiment: Positive
OnZero to Supply AI Waste Heat to Helsinki District Heating
OnZero Finland Oy, a subsidiary of Vienna-based OnZero Alpha Holdings GmbH, has signed an agreement with Helsinki utility Helen Oy to feed waste heat from AI computing into Helsinki's district heating network. The so-called AI Heat Factory is designed to deliver up to 525,000 MWh of heat annually, equivalent to the needs of around 70,000 apartments and a continuous thermal output of about 60 MW. OnZero uses liquid-cooled systems that recover up to 99 percent of heat generated by AI workloads, avoiding evaporative cooling and local water consumption. Commissioning is planned for 2026. Helen, which has used data center waste heat since 2010, aims to end combustion-based energy generation by 2040. OnZero currently operates two smaller sites in Finland, Kemijärvi and Kerava, and has a project in development in Fagersta, Sweden.
The deal illustrates a credible commercial model for reducing the environmental footprint of AI data centers and integrating them with municipal energy infrastructure, relevant to the AI infrastructure powering AdTech, but it is not a direct AdTech market event.
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Key Takeaways & Evidence Grounding
- OnZero Finland Oy signed an agreement with Helsinki energy company Helen Oy to supply recovered AI compute heat to the city's district heating network.
- The AI Heat Factory will provide up to 525,000 MWh of heat per year, enough for about 70,000 apartments.
- OnZero's liquid-cooled architecture recovers up to 99 percent of waste heat from AI computing with zero on-site water consumption for cooling.
- Helen has used data center waste heat since 2010 and aims to phase out combustion-based energy generation by 2040.
- OnZero currently operates two plants in Finland (Kemijärvi and Kerava) that have delivered about 30,700 MWh of heat.
Connected Companies & Entities
1 Entity mapped“Der Versorger nutzt Abwärme aus Rechenzentren seit 2010 und hat unter anderem Verträge mit Equinix geschlossen....”
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