Nebius Mäntsälä
Mäntsälä, Finland · operating · operated for Nebius
Nebius's European flagship, expanded from 25 MW to 75 MW, cooled with outside air and feeding recovered server heat into the town's district heating network — a working example of the heat-reuse chain in the catalog.
Compute Atlas, the sister dataset on supercomputer and AI-cluster supply chains, has the component-by-component record for this campus: Nebius Mäntsälä cluster (system) · Nebius Mäntsälä data center (site).
What's documented
- Expanded from 25 MW to 75 MW (announced October 8, 2024), enough for up to 60,000 GPUs, with Nvidia H100s installed and H200s from November 2024. [source]
- Free outside-air cooling through an airplane-wing-shaped building profile; PUE of 1.1 under high IT load, with servers running at up to 40°C. [source]
- Heat recovery feeds local district heating — about 20,000 MWh a year, enough for roughly 2,500 Finnish homes. [source]
- The completed expansion hosts Europe's first operational Nvidia GB300 NVL72 deployment; a second 310 MW Finnish site in Lappeenranta (announced March 2026) targets first customer capacity in 2027. [source]
Suppliers reported inside
Placements come from the cited reporting, not operator disclosures, unless a source says otherwise.
The generic bill of materials
Whatever the vendor list, a facility like this contains the same part categories:rack-scale systems, direct-to-chip cold plates, coolant distribution units, large power transformers (345–765 kV) & substations, UPS (static, modular, rotary/DRUPS) & UPS power semis, backup generation: gensets, fuel systems, HVO, chillers & compressors — the full set is in the scales matrix.