Caverion Finland strengthens its position in the data centre market and will deliver a EUR 15 million substation for AI cloud company Nebius
Press release
2 October 2026 at 6:15 CET
The growth of digital infrastructure is accelerating new substation projects in Finland. Caverion Finland has signed an agreement with AI cloud company Nebius for the design and delivery of a substation serving Nebius's new data centre in Mäntsälä, Finland. The contract is worth approximately EUR 15 million. The substation will serve Nebius's second data centre in Mäntsälä, a new 70-megawatt building alongside its existing 75-megawatt site.
The substation is the data centre’s critical connection to the electricity grid
The substation serves as the data centre’s gateway to the electricity grid. It enables electricity supplied at high voltage to be transferred safely, reliably and without interruption for the data centre’s use. This makes the substation one of the most important infrastructure components of the entire data centre.
“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. We thank Nebius once again for its trust,” says Kari Aalto, Head of Industrial Projects and Infrastructure at Caverion Finland.
"Our capacity expansion in Mäntsälä with the new data center is a key part of developing Nebius's global AI infrastructure footprint. We value Caverion’s experience, delivery reliability, and high-quality and safe implementation approach," sais Andrey Blokhin, SVP of Global Infrastructure at Nebius.
“Above all, the fast lead time is made possible by our own professionals, who have extensive experience in demanding energy and infrastructure projects. Other significant factors include precise phasing of the implementation, a local partner company network, and our company’s proactive procurement and supply chain management. We leverage the lessons learned from our successful substation projects to the fullest, drawing on experience that has been thoroughly documented and analysed in detail,” Aalto continues.
Caverion and its parent company Assemblin Caverion Group have a strong position as trusted partners for demanding industrial and infrastructure projects, including data centre, high-voltage and power-grid projects. In addition to Nebius’ Mäntsälä data centre and the related substation construction in Finland, public data centre references include Hyperco Kouvola project in Finland, the MCF Group Estonia data centre expansion in Estonia, a data centre expansion in Denmark, and the Coromatic Stockholm project in Sweden.
For further information, contact:
Kari Aalto, Head of Industrial Projects and Infrastructure, Caverion Finland, kari.aalto@caverion.com
Åsvor Brynnel, Head of Group Communications and Sustainability, SVP, asvor.brynnel@assemblincaverion.com, tel. +46 10 475 39 48
About Assemblin Caverion Group
Assemblin Caverion Group is a leading northern European provider of technical services and installations, delivering smart and sustainable solutions in multiple technical expertise areas across the full lifecycle of the built environment. With around 20,000 skilled and committed professionals in nine countries, we help customers improve energy efficiency, sustainability and automation in buildings, infrastructure and industrial environments through our main brands, Assemblin and Caverion, alongside several other commercial and product brands. The Group generated SEK 42 billion (EUR 3.8 billion) in revenue over the last twelve months.
www.assemblincaverion.com
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