DayOne announces flagship hyperscale data center project in Lahti, Finland ↗
Published 2025-08-14 · Retrieved 2026-10-07
Operator announcement identifies Finland campus, potential 128 MW IT load, first 50 MW building and design objectives.
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Finland / Site
DayOne Lahti campus
128 MWIT loadTotal potential Lahti campus · 2025-08-14
DayOne Lahti Data Center · Lahden datakeskus
Under ConstructionPlanned
Hyperscale campus under construction in Kiveriö, with further campus development planned. Service is targeted for 2027; TikTok is the announced anchor tenant.
Last researched 2026-10-07Last verified Not independently verifiedPublished revision 1
No approved site photo yet. Photos and their source dates are published after evidence review.
Site profile
- Operator
- DayOne
- Ownership
- Unknown / not established
- Business model / scale
- Colocation / Hyperscale
- Region / metro
- Päijät-Häme / Unknown
- City / locality
- Lahti
- Address
- Ilmarisentie 3, Lahti, Finland
- Location
- Property identified by contractor address Ilmarisentie 3 and municipal description between Ilmarisentie and Väinämöisentie; no corroborated coordinate obtained.
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 |
|---|---|---|---|
| 128 MW IT load | Total potential Lahti campus Planned · cumulative | 2025-08-14 | Reported claim ↗ Excluded from capacity totals. Announcement date; potential build-out, not commissioned capacity. Includes first building. |
| 50 MW IT load | First Lahti building Planned · incremental | 2025-08-14 | Reported claim ↗ Excluded from capacity totals. Announcement date; component of 128 MW campus claim. Later construction evidence does not independently allocate all construction capacity to this building. |
Development timeline
- 2025-08-14 · announcement
Campus announced
DayOne announced its Lahti project.
Supporting source ↗ - 2025-Q3 · planned
Demolition target
Original announcement scheduled site demolition for Q3 2025; actual completion unconfirmed.
Supporting source ↗ - 2026-05 · actual_reported
Preparatory construction
Contractor subsequently reported preparatory work began in May.
Supporting source ↗ - 2026-06 · actual_reported
Main contractor commencement
SRV reported main-contract commencement in June.
Supporting source ↗ - 2026-10-06 · actual_reported
Construction continuing
Contractor update reported exterior wall installation ongoing.
Supporting source ↗ - 2027 · planned
Operations target
Contractor states operations are targeted during 2027.
Supporting source ↗
Disclosed specifications
Heat reuse
District heating integration being exploredNo operational heat delivery established.
Source ↗Grid infrastructure
110 kV substation and cabling to Lahti EnergiaEltel contract; voltage is not MW capacity.
Source ↗Proposed building area
Approximately 40,000 m²Permit application total for data centre and ancillary buildings; not ultimate campus floor area.
Source ↗Permit applicant
Kiinteistö Oy Lahden Ilmarisentie 3Applicant identity does not establish legal ownership.
Source ↗Local DayOne entity
Digitalland Services (FI) OyNamed by municipality; ownership chain unresolved.
Source ↗Public anchor tenant
TikTokFuture principal tenant announced April 2026; supersedes August 2025 statement that no tenant agreements were finalized.
Source ↗Sources and references
Source attribution does not imply independent verification or permission to reuse images.
A €1.2 billion data centre to be built in Kiveriö, Lahti ↗
Published 2025-08-14 · Retrieved 2026-10-07
Municipality locates approximately ten-hectare plot between Ilmarisentie and Väinämöisentie in Kiveriö.
Lahden datakeskus — työmaan tiedotteet ↗
Published Date unavailable · Retrieved 2026-10-07
Dated contractor updates identify Ilmarisentie 3, describe May preparatory work and June main-contract commencement, and confirm wall installation on 6 October 2026.
TikTok investoi miljardin Lahden datakeskukseen ↗
Published 2026-04-10 · Retrieved 2026-10-07
City announces TikTok as future principal tenant of DayOne’s Kiveriö development.
Eltel rakentaa sähkönsiirtoyhteydet DayOnen datakeskukselle Lahteen ↗
Published 2025-09-12 · Retrieved 2026-10-07
Contract includes a 110 kV substation and cabling to Lahti Energia, with completion targeted for early 2027.
Datakeskuksen rakentamislupa rakennus- ja ympäristölupalautakuntaan ↗
Published 2025-10-02 · Retrieved 2026-10-07
City-issued release names permit applicant Kiinteistö Oy Lahden Ilmarisentie 3, construction location Väinämöisentie 2 a, and approximately 40,000 m² of buildings.
Lahti – Päijät-Häme Region: building the future of sustainable Finland and Europe ↗
Published Date unavailable · Retrieved 2026-10-07
Regional council document explicitly lists Lahti among Päijät-Häme municipalities.
Kasvusopimus ja mikroliikennelupa kaupunginhallituksessa ↗
Published 2025-08-21 · Retrieved 2026-10-07
Municipality identifies Digitalland Services (FI) Oy as DayOne in the growth partnership context.
DayOne Data Centers Limited — Form F-1 registration statement ↗
Published Date unavailable · Retrieved 2026-10-07
Issuer describes contracted space, power and cooling services, acquisition of a Lahti site, and 281 MW committed across Lahti and Kouvola; regional bookings were under construction as of 20 September 2026.
Profile field evidence
Name: DayOne announces flagship hyperscale data center project in Lahti, Finland
Aliases: DayOne announces flagship hyperscale data center project in Lahti, Finland; Lahden datakeskus — työmaan tiedotteet
Kind: DayOne announces flagship hyperscale data center project in Lahti, Finland
Country: DayOne announces flagship hyperscale data center project in Lahti, Finland
Region: Lahti – Päijät-Häme Region: building the future of sustainable Finland and Europe
City: DayOne announces flagship hyperscale data center project in Lahti, Finland; A €1.2 billion data centre to be built in Kiveriö, Lahti
Address: Lahden datakeskus — työmaan tiedotteet
Operator: DayOne announces flagship hyperscale data center project in Lahti, Finland; Kasvusopimus ja mikroliikennelupa kaupunginhallituksessa
Business Model: TikTok investoi miljardin Lahden datakeskukseen; DayOne Data Centers Limited — Form F-1 registration statement
Scale: DayOne announces flagship hyperscale data center project in Lahti, Finland
Statuses: DayOne announces flagship hyperscale data center project in Lahti, Finland; Lahden datakeskus — työmaan tiedotteet
Summary: Lahden datakeskus — työmaan tiedotteet; TikTok investoi miljardin Lahden datakeskukseen
Location: A €1.2 billion data centre to be built in Kiveriö, Lahti; Lahden datakeskus — työmaan tiedotteet
Stable identifier: 3a97054e-856b-4fea-9002-cf983dbf693f