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Microsoft Kirkkonummi Kolabacken data center

≈144 MWIT loadCombined three-building Kirkkonummi campus in assessed VE1 alternative · 2026-10-07

Kirkkonummen datakeskus · Microsoft Kirkkonummi datacenter

Under ConstructionPlanned
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Microsoft cloud data-center campus in Kolabacken, Sundsberg, comprising HEL04 and planned HEL05/HEL06 buildings. Construction remained underway in September 2026. The 2024 EIA assessed approximately 144 MW combined IT capacity; this is a planned campus claim, not commissioned capacity. Fortum's neighboring heat-production plant is a separate asset.

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
Microsoft
Ownership
Unknown / not established
Business model / scale
Owner Operated / Unknown
Region / metro
Uusimaa / Helsinki region
City / locality
Kirkkonummi
Address
Sundsbergin yritystie 19, 02450 Sundsberg, Kirkkonummi, Finland
Location
Municipal permit establishes parcel 257-483-0002-0126 and street address; no independently corroborated geographic point obtained.
Precision: unknown
Parent
Not assigned

Capacity evidence

Statements retain their dates, definitions and development scope. Do not add these rows together.

Claim / measurementScope and statusAs ofEvidence and accounting
≈144 MW
IT load		Combined three-building Kirkkonummi campus in assessed VE1 alternative
Planned · cumulative		2026-10-07Reported claim ↗

Excluded from capacity totals. As-of date is retrieval, not the original claim date. Claim belongs to the 2024 EIA; exact publication day was not established. Search-indexed report evidence only because PDF opening failed. Exceeds 5 MW for planned-project eligibility; no operational load established.

Development timeline

  1. 2025-04-22 · actual_permit

    Second-phase building permit granted

    Municipal board granted the HEL05/HEL06 permit with commencement rights.

    Supporting source ↗
  2. 2025-06 · actual_contractor_change

    Winthrop became main contractor

    Microsoft reports Winthrop began work as principal contractor in June 2025.

    Supporting source ↗
  3. 2026-04-28 · announcement

    Second-phase investment confirmed

    Microsoft confirmed investment and permits for second phases across the Finnish three-campus program.

    Supporting source ↗
  4. 2026-09-24 · actual_construction_update

    Two buildings undergoing construction

    Contractor reports first-building installations and interior work, and second-building structural and envelope work; no opening announced.

    Supporting source ↗
  5. 2026–2027 · planned_construction_completion

    First-phase construction completion window

    Microsoft estimated first-phase construction completion around the year boundary for the regional program, followed by commissioning preparation; this is not a confirmed opening date.

    Supporting source ↗
  6. 2027 · planned_heat_recovery

    Phased data-center waste heat integration

    Fortum expects waste heat integration from the Kolabacken and Hepokorpi data centers to start in phases in 2027.

    Supporting source ↗

Disclosed specifications

Permit parcel area

516530 m²

Building-site area stated in second-phase permit; not building floor area or the broader planning zone.

Source ↗

Campus buildings

HEL04, HEL05, HEL06

HEL04 is first phase; HEL05 and HEL06 are second phase. Retained as one campus.

Source ↗

Second-phase built form

Two two-story data-center and office buildings

Permitted scope, not completed buildings.

Source ↗

Power supply redundancy

Two electricity supply connections

Connection capacities not disclosed in the opened municipal discussion.

Source ↗

HEL04 backup generators

21 generators; approximately 160 MW combined fuel-input power

Fuel-input thermal rating, excluded from IT/facility/grid capacity claims; municipal discussion describes renewable fuel as primary and light fuel oil as backup.

Source ↗

Heat recovery

Planned integration with Fortum district heating

Separate heat plant already produces heat independently; data-center waste heat integration expected from 2027. Regional percentages and heat-plant MW are not this campus's IT load.

Source ↗

Roof features

Partial green roofs and office-roof solar panels

Second-phase permitted design; installed status unconfirmed.

Source ↗

Public project contact

dcsuomi@microsoft.com

Microsoft publishes this address for project inquiries; no contact made.

Source ↗

Sources and references

Source attribution does not imply independent verification or permission to reuse images.

Kirkkonummi datacenter project updates — Microsoft Local ↗

Published Date unavailable · Retrieved 2026-10-07

April 2026 update describes first-building facade/interior work and second-building foundations. June event address is Sundsbergin yritystie 19, 02450 Masala. Winthrop became main contractor in June 2025.

Kirkkonummi — Ympäristövaikutusten arviointi ↗

Published Date unavailable · Retrieved 2026-10-07

Search-indexed original report passages identify the assessed three-building, approximately 50 ha project and approximately 144 MW IT capacity under VE1. Report is identified as 2024; exact publication day unavailable. Direct PDF opening failed, so evidence is limited to indexed passages.

Kirkkonummen datakeskus — Sweco ↗

Published Date unavailable · Retrieved 2026-10-07

Planning consultant identifies Kolabacken in Sundsberg and EKE-Rakennus Oy as historical landowner commissioning planning. Illustrative image is explicitly labeled a rendering.

Profile field evidence

Name: Kirkkonummi datacenter project updates — Microsoft Local; Kirkkonummen datakeskus — Sweco

Aliases: Kirkkonummi datacenter project updates — Microsoft Local; Kirkkonummen datakeskus — Sweco

Kind: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Rakennuslupa LP-257-2024-02386 / Sundsbergin yritystie 19 — second phase; Microsoftin datakeskushankkeen toisen vaiheen rakentamislupa on vireillä

Country: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Kirkkonummi, Finland — Project Updates — Winthrop Technologies; Fortum has started heat production at two large data centre sites in Finland

Region: Kirkkonummen asuinalueet — Municipality of Kirkkonummi

City: Rakennuslupa LP-257-2024-02386 / Sundsbergin yritystie 19 — second phase; Kirkkonummen datakeskus — Sweco

Metro: Fortum has started heat production at two large data centre sites in Finland; Kirkkonummen asuinalueet — Municipality of Kirkkonummi

Address: Rakennuslupa LP-257-2024-02386 / Sundsbergin yritystie 19 — second phase

Operator: Kirkkonummi datacenter project updates — Microsoft Local; Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen

Business Model: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen

Statuses: Rakennuslupa LP-257-2024-02386 / Sundsbergin yritystie 19 — second phase; Kirkkonummi, Finland — Project Updates — Winthrop Technologies; Microsoftin datakeskushankkeen toisen vaiheen rakentamislupa on vireillä

Summary: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Rakennuslupa LP-257-2024-02386 / Sundsbergin yritystie 19 — second phase; Kirkkonummi, Finland — Project Updates — Winthrop Technologies; Kirkkonummi — Ympäristövaikutusten arviointi; Fortum has started heat production at two large data centre sites in Finland

Location: Rakennuslupa LP-257-2024-02386 / Sundsbergin yritystie 19 — second phase; Kirkkonummi municipal executive board minutes — Microsoft environmental permit consultation

Stable identifier: 5e5ddc93-8655-42dc-b44f-0ec197203b76