Caverion strengthens its position as key partner in major infrastructure investments in Europe – secures a large contract related to the expansion of a state-of-the-art data centre in Finland

Caverion has signed a comprehensive agreement with Nebius DC Oy, a Finnish subsidiary of leading AI infrastructure provider Nebius, covering total technical solutions, such as cooling, heat recovery, ventilation, and fire safety at Nebius’s data centre located in Mäntsälä, Finland. The estimated total value of the agreement is approximately 80 million euros.    

The Mäntsälä data centre is a flagship site for Nebius, an Amsterdam-headquartered technology company that builds infrastructure for the global AI industry. The expansion project includes the extension of the existing building and the construction of two new data centre buildings. Once complete, the Mäntsälä data centre will have total capacity of 75 MW.   

The contract with Caverion includes delivery of liquid cooling (to complement existing air cooling systems), heat recovery, ventilation, fire alarm, fire extinguishing and smoke extraction systems as well as electrical and HVAC installations in the existing data centre building and in the two new ones. The project started in April 2025 and is planned to be completed early 2026.  

The data centre at Mäntsälä deploys a variety of technological solutions aimed at reducing environmental impact. The data centre utilises free cooling and incorporates a heat recovery system to direct waste heat to the district heating network. This system currently recovers approximately 20,000 MWh of energy annually, heating the equivalent of 2,500 Finnish homes. As the data centre expands, the volumes of recovered heating are expected to increase, helping reduce the district’s heating-associated emissions.  

“At Caverion, we are committed to similar high sustainability principles as those adopted by Nebius. This assignment is very important to us and speaks for Caverion's expertise in managing large-scale contracts and delivering high-quality technical solutions. We are proud to support Nebius in building highly performant, energy-efficient AI infrastructure in Finland”, says Ville Tamminen, CEO of Caverion Finland, EVP.   

“Data centres and critical infrastructure are an important part of Assemblin Caverion Group’s strategy. Our position in the market is strong and we are pleased to support global infrastructure customers such as Nebius with our specialised capabilities and broad service delivery”, adds Jacob Götzsche, Executive Chairman of the Board, Assemblin Caverion Group.   

“The expansion of the Mäntsälä site is a strategically important part of our global AI infrastructure build-out, and will enable us to better serve growing demand from AI builders globally. We are pleased to count on Caverion’s expertise and multi-technical competence in ensuring timely, high-quality delivery”, says Andrey Korolenko, Chief Product and Infrastructure Officer at Nebius.  

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Photo: Nebius 

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