Caverion to Build €15M Substation for Nebius (this site on nebius) (find out more) Data Centre in Finland
Caverion Finland has agreed to design and build a substation for Nebius's new data centre in Mäntsälä, southern Finland, in a deal valued at about €15 million. The company announced the contract on Friday and expects to finish the work by autumn 2027.
The Substation
The 70-megawatt substation will connect Nebius’s second Mäntsälä data centre to the grid. According to Kari Aalto, Head of Industrial Projects and Infrastructure at Caverion Finland, the substation will have a capacity of 70 megawatts.
Project Details
"We will deliver the substation in Mäntsälä on an exceptionally fast schedule, as is typical for data centre construction: the substation will be completed in autumn 2027," said Aalto.
The substation will support Nebius’s second building in Mäntsälä, a 70-megawatt facility next to its current 75-megawatt data centre.
Nebius's Expansion
Nebius, based in Amsterdam, provides AI computing power to companies that train and run AI models. The company announced the second Mäntsälä site in August. When the new site opens in 2027, Nebius will have a total of 455 megawatts across three Finnish locations.
Previous Collaborations
This is Caverion’s third deal with Nebius in Finland. In 2025, the company signed an €80 million contract to provide cooling, heat recovery, ventilation, and fire safety systems at the first Mäntsälä site. Earlier this year, Caverion also agreed to build a €15 million substation for Nebius’s data centre in Lappeenranta, scheduled for completion in 2027.
Caverion, part of the Assemblin Caverion Group, has built about 30 new substations in Finland in recent years and upgraded around 50 others.