DEPLOYDatabase

Data center campus

Nebius Mäntsälä Data Center

Nebius Mäntsälä Data Center is an AI data center campus developed by Nebius in Uusimaa, Mäntsälä. 0.07 GW of capacity has been announced; 0.03 GW is energized. The gap is what this page tracks: what is claimed versus what is actually built, each figure dated and sourced.

Partially energized · Nebius · other · Mäntsälä, Uusimaa, Finland (Eurosatory 2026 showcase), Europe

Track Nebius Mäntsälä Data Center

Capacity: announced vs energized

Contracted
not recorded
Under construction
not recorded

Announced-to-energized gap: 0.05 GW. Every figure below is a single dated, sourced claim. Current best per series resolves by evidence tier, then date. See the methodology.

99th-largest announced of 102 tracked campuses27th by energized capacity4th percentile announced-to-energized gap≈ 61,000 homes of power at full announced capacity (basis)

Promised online: 2025. Energized capacity is now on record. Claimed by Nebius (source).

Nebius Mäntsälä Data Center capacity claims
Source
Announced0.07 GW2024-10-01claimedpress release
Energized0.03 GW2024-06-01reportedpress release

Key facts

partially energized

Lifecycle

0.07 GW

Announced

0.03 GW

Energized

Nebius

Developer

Europe

Location

other

Grid

0.05 GW

Announced-to-energized gap

Reported facts

Structured facts sourced from citations already on this record. Each fact traces to a source in the References section below.

Expansion target (company)
Oct 8 2024 Nebius announced it would triple capacity at its Mäntsälä, Finland data center to 75 MW, enabling up to 60,000 GPUs at that location alone, with stated annual revenue potential over USD 1 billion at full utilization (Nebius, Oct 8 2024)
GPU roadmap (company)
Expansion includes NVIDIA H200 (customer availability from Nov 2024 per the release) alongside installed H100s, with Nebius saying it would be among the first in Europe to bring NVIDIA Blackwell to customers in 2025 (Nebius, Oct 8 2024)
Efficiency / heat recovery (company)
Company cites PUE as low as 1.1 under high IT loads, free cooling, and heat recovery of about 20,000 MWh annually (heating equivalent of about 2,500 Finnish homes), with operations at server temperatures up to 40C (Nebius, Oct 8 2024)
ISEG supercomputer (company)
Mäntsälä hosts ISEG, cited at 35.26 GFlops per watt-second and ranked in the top 25 supercomputers globally by energy efficiency in the company release (Nebius, Oct 8 2024)
Europe investment program (company)
Expansion framed as part of Nebius investing more than USD 1 billion in AI infrastructure in Europe by mid-2025, including build-to-suit greenfield sites and colocations (Nebius, Oct 8 2024)

On the data center map

No mappable coordinate is recorded for Nebius Mäntsälä Data Center yet. Location: Mäntsälä.

The story of Nebius Mäntsälä Data Center
Announced capex
$1B
Cooling
liquid cooling with heat recovery (~20,000 MWh/yr); PUE ~1.1
GPUs
60K up to 60,000 GPUs (H100/H200/Blackwell)
Derived
Cost per MW
$13M/MW

Every figure is one row in the ledger below with its source. Derived rows are pure arithmetic on the rows above (not new claims). Absent lines mean the fact isn't on record yet.

The deal

chip supplier
NVIDIA · H100/H200 and Blackwell GPUs
developer
Nebius · AI cloud company (Nasdaq: NBIS); developer and operator

Power

Power source
grid
Grid operator
other
Interconnection
Water
Free cooling; heat-recovery system recovers ~20,000 MWh/yr, heating equivalent of ~2,500 Finnish homes

Why here

Nebius Mäntsälä Data Center is in Uusimaa, Mäntsälä. It connects to the other grid, draws on grid power. This siting summary is composed from the record's held fields, not speculation; see methodology.

Financial structure

European AI infrastructure program (not Mäntsälä-specific)
$1B. More than USD 1B across Europe by mid-2025; not site-specific company filing

Investment, workforce and specs

Cooling
liquid cooling with heat recovery (~20,000 MWh/yr); PUE ~1.1 source
GPUs
Up to 60,000 GPUs (NVIDIA H100/H200, Blackwell) source

Estimated compute: the claimed Up to 60,000 GPUs (NVIDIA H100/H200, Blackwell) chips are on the order of 6.9x the compute used to train a GPT-4-class model. Derived from the chip-count claim, not measured (basis).

Timeline

  2. Aug 2026
    party linked
    developer: linked externalName "Nebius" to company nebius
  3. Oct 2026
    Current: Partially energized

Sources

dee2544a-dedc-4d29-9109-1e969a496373 · Tracked with DEPLOY's verified-vs-claimed methodology. Every term is defined in the glossary. Announced numbers are claims, not built capacity.

Head-to-head

Nebius Mäntsälä Data Center vs Nebius Lappeenranta AI Factory →Nebius Mäntsälä Data Center vs Mäntsälä campus →Nebius Mäntsälä Data Center vs Vineland campus →Nebius Mäntsälä Data Center vs Kansas City →Nebius Mäntsälä Data Center vs Israel cluster →

Common questions

What is Nebius Mäntsälä Data Center?
Nebius Mäntsälä Data Center is an AI data center campus tracked on the DEPLOY registry, located in Mäntsälä. DEPLOY records its capacity as a dated, sourced ledger: announced gigawatts versus actually energized gigawatts, never a press-release total.
How much power will Nebius Mäntsälä Data Center use?
Nebius Mäntsälä Data Center has 0.07 GW of announced capacity on the DEPLOY registry, of which 0.03 GW is recorded as energized, an announced-to-energized gap of 0.05 GW. Each figure is individually dated and sourced.
Who is building Nebius Mäntsälä Data Center?
Nebius is recorded as a party to Nebius Mäntsälä Data Center on the DEPLOY registry. The full party list, with each role, is on the record.
Is Nebius Mäntsälä Data Center operating yet?
As of the most recent verification on the DEPLOY registry, Nebius Mäntsälä Data Center is partially energized. DEPLOY tracks the lifecycle from announced through energized, so the current state reflects sourced evidence, not the original announcement.
How verified is the data on Nebius Mäntsälä Data Center?
A human editor has reviewed this record for the indexed registry. Every capacity figure is an append-only, dated claim resolved to the highest-evidence tier; superseded claims are kept but excluded from the current view.

Deploy Watch

Track Nebius Mäntsälä Data Center on Deploy.

We notify you when energized capacity, lifecycle state, or a new dated capacity claim changes against primary-source evidence, not when the developer issues a press release.

Cite this page

DEPLOY. (2026). Nebius Mäntsälä Data Center: AI data center campus record. Retrieved October 4, 2026, from https://registry.deploy.report/datacenters/nebius-mantsala

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The verified data on this page is available under a Creative Commons Attribution 4.0 license: reuse the facts freely, with attribution to DEPLOY (deploy.report). The prose, design, and any imagery are not included and keep their own rights.

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