European AI data center developer Nebius has announced it will triple the capacity of its data center in Mäntsälä, Finland.

The expansion will see Nebius place upwards of 60,000 GPUs at the facility, growing its capacity from 25MW to 75MW.

Mäntsälä data center
Nebius Data Center – Nebius Data Center

The expansion is part of a broader program that will see the company invest upwards of $1 billion in AI infrastructure in Europe by mid-2025, including build-to-suit data centers at greenfield sites and colocations, in addition to its recently announced GPU cluster in Paris.

However, speaking to press at the Mäntsälä facility last week, the company also teased a forthcoming data center in an as-yet undisclosed location in North America. The US facility will be in addition to the two new European data centers Nebius has already signed letters of intent for.

The Mäntsälä expansion will include the deployment of Nvidia H200 Tensor Core GPUs, which will be available to customers starting in November, making Nebius one of the first European providers to bring the platform to market.

The data center utilizes free cooling, reducing reliance on chillers and refrigerants, and incorporates a heat recovery system to repurpose server heat for local residential heating. This system currently recovers approximately 20,000MWh of energy annually. The expansion will further increase the efficiency of the heat recovery system.

The design allows the facility to run operations at higher server temperatures, up to 40°C (104°F), contributing additional energy savings of approximately 15 percent.

Andrey Korolenko, Nebius head of product and infrastructure, said: “Tripling capacity at our flagship site in Finland is an important step in our build-out of best-in-class AI infrastructure in Europe. Our data center at Mäntsälä is our ‘home base’ and showcases our ambition and the technical capabilities of the Nebius team, as well as our approach to adopting sustainability principles in our infrastructure.”

The expansion comes after Yandex's rebranding of its European operations to Nebius Group following its split from the Russian unit.

Earlier this year, the company agreed to sell its Russian operations to local management and investment firms. The Amsterdam-based firm retained the company’s Finnish data center and Nebius AI unit, as well as data firm Toloka AI, edtech provider TripleTen, and autonomous driving firm Avride.