Nebius's AI cloud data-center site in Mäntsälä, Finland. The operator reported completion of expansion up to 75 MW earlier in 2026 without specifying the power basis. A new adjacent 70 MW building is announced, with its substation scheduled for autumn 2027. This site is distinct from Verne's Gneissitie development and Nebius's Lappeenranta project.
Last researched 2026-10-07Last verified Not independently verifiedPublished revision 1
Site / building photo
Exterior side view of a Mäntsälä data-center building, published under its former Yandex identity; capture date unknown.
Published date unknown · Captured date unknown · Checked 2026-10-07
Research-selected property image; reviewer must confirm site identity, suitability and rights before publication.
Hosted by Baxtel; photographer and original provenance not established. No reuse license found. Rights require review before import; displayed page date is not a verified capture date. Publication and capture dates were not independently established.
Site profile
Operator
Nebius
Ownership
Unknown / not established
Business model / scale
Owner Operated / Unknown
Region / metro
Uusimaa / Unknown
City / locality
Mäntsälä
Address
Moreenikatu 6, 04600 Mäntsälä, Finland
Location
Address associated with the facility by an industry directory and corroborated by Nebius DC Oy's registered visiting address; no independently sourced property point or accessible Google Maps marker established. Precision: unknown
Parent
Not assigned
Capacity evidence
Statements retain their dates, definitions and development scope. Do not add these rows together.
Claim / measurement
Scope and status
As of
Evidence and accounting
75 MW Unspecified power
Total site capacity after announced expansion Planned · cumulative
Excluded from capacity totals. Announcement date; operator says expansion up to this capacity completed earlier in 2026. Capacity ceiling, not measured consumption; overlaps c1.
70 MW Unspecified power
New adjacent second data-center building Planned · incremental
Excluded from capacity totals. Contract announcement date; completion expected autumn 2027. Supports the same expansion as c3 and must not be added to it.
≈75 MW IT load
Current campus IT-power estimate Operational · cumulative
Excluded from capacity totals. Displayed directory update date. Third-party estimate labels power as IT; primary operator announcement does not establish that basis.
≈145 MW IT load
Projected campus IT power in Q4 2027 Planned · cumulative
Excluded from capacity totals. Displayed directory update date, not commissioning date. Third-party projection includes adjacent expansion and overlaps existing-capacity claims; no independently confirmed operator campus IT total.
Development timeline
2024-10-08 · announcement
Expansion to 75 MW announced
Operator announced tripling site capacity with potential deployment of up to 60,000 GPUs.
Identifies its first Finnish data center in Mäntsälä and reports expansion up to 75 MW completed earlier in 2026; the 310 MW project is in Lappeenranta.
Nebius DC Oy is a Finnish Nebius subsidiary. Expansion extends existing building and adds two buildings, reaching total 75 MW; contract includes liquid cooling and heat recovery. Approximately 20,000 MWh recovered annually.
Associates Nebius facility with Moreenikatu 6 and former Yandex name. Its 25 MW operating-capacity description is outdated relative to the 2026 operator announcement.
Displays update October 5, 2026; estimates 75 MW IT power currently and 145 MW IT power in Q4 2027. Microsoft use is explicitly speculative; heat figure uses kWh rather than contractor's MWh.
Exterior side view of a Mäntsälä data-center building, published under its former Yandex identity; capture date unknown. Original image: https://cdn.baxtel.com/data-center/yandex-mantsala-finland/photos/gallery_display_Yandex-Mantsala-Finland-Side-of-one-of-the-Yandex-data-center-buildings.jpeg
