Keravan Energia Oy and OnZero have signed an agreement to deploy OnZero data center at Keravan Energia’s production facility in Sipoo. OnZero’s liquid-cooled compute infrastructure captures waste heat and feeds it directly into the district heating network serving the Söderkullan area. No additional heat pumps required.
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.
