OnZero will be at Exhibition Booth 49, where the company will present its AI Heat Factory: a modular, liquid-cooled compute infrastructure that captures waste heat and delivers it as 95°C recovered thermal energy, directly into district heating networks, in place of fossil-fuel combustion.

The timing is significant. The Finnish district heating sector is under growing pressure to decarbonise, and the conversation at Kaukolämpöpäivät has increasingly turned to the question of how new heat sources can replace fossil fuel boilers at scale. OnZero’s model offers a direct answer: high-performance AI compute co-located with district heating infrastructure, turning the energy that would otherwise be vented into the atmosphere into a controllable, continuous heat supply.

It is a model that is already operational. OnZero’s sites in Kemijärvi and Kerava have been delivering heat to Finnish district heating networks since 2025, giving the company a concrete operational reference point to bring to the conversations in Tampere.

For district heating operators, energy utilities, and procurement decision-makers attending the event, OnZero’s booth will be an opportunity to see how the integration of compute infrastructure and heat networks works in practice, and what it could mean for their own decarbonisation roadmap.

Further information about Kaukolämpöpäivät 2026, including the programme and registration, is available at kaukolampopaivat.fi.

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At full operation, the facility produces approximately 20 GWh of thermal energy annually, meeting around 75 percent of Söderkullan’s district heating demand. For a single facility, that is a substantial share of an area’s entire heating supply, delivered from heat that conventional data centers would discharge into the atmosphere. For Keravan Energia, it means a controllable, continuous heat source running year-round, reducing the utility’s reliance on combustion-based production in line with its clean transition strategy.

Zero waste is not a slogan at OnZero. It is the engineering principle the company was founded on. Every megawatt of compute capacity deployed has a destination for its heat. In a region where utilities are under growing pressure to replace combustion-based heat with clean alternatives, and where the demand for AI compute infrastructure is accelerating in parallel, that principle puts OnZero in an unusual position: a company whose core product becomes more valuable precisely when both pressures peak at the same time. The Helsinki metropolitan region is that moment, and Sipoo is where it becomes concrete.

To see how much CO2 this project saves in real time, visit our Footprint section.

The Sipoo project is the first deployment of this kind within Keravan Energia’s service area. The utility has indicated that a successful outcome opens the door to replication across multiple sites in the region.

Keravan Energia’s full announcement is available on their website.

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