Finland / Site
Espoon datakeskus · Hepokorvenkallio data centre
Microsoft cloud campus in Hepokorpi, Högnäs, Espoo, forming part of its Finland data-center region alongside Kirkkonummi and Vihti. Construction is underway, with further phases permitted. The 2024 EIA assessed approximately 173 MW of IT capacity across four buildings; subsequent permitting describes HEL16, HEL17 and HEL18 and approximately 60 MW of electrical capacity for HEL16. Initial operation is expected around 2027, subject to commissioning.
Statements retain their dates, definitions and development scope. Do not add these rows together.
| Claim / measurement | Scope and status | As of | Evidence and accounting |
|---|---|---|---|
| ≈173 MW Unspecified power | Ultimate Hepokorvenkallio project described in 2023 EIA requirement decision Planned · cumulative | 2023-01-11 | Reported claim ↗ Excluded from capacity totals. As-of is the government decision date. Document states a maximum 173 MW project; electrical basis is unspecified. Overlaps the later EIA IT claim and must not be added to it. |
| ≈60 MW Unspecified power | HEL16 operation described in environmental permit application Planned · unclear | 2025-03-20 | Reported claim ↗ Excluded from capacity totals. As-of is municipal consultation date. Source calls this electrical capacity of the functions; it does not establish IT load versus total facility input. Do not add to the campus claim. |
City reports approximately 21.6 hectares sold to Microsoft 3465 Finland Oy.
Supporting source ↗Permit recorded in the municipal meeting of 30 October 2025; permission is not evidence of commissioning.
Supporting source ↗Microsoft confirms second-phase construction decision for all three Finland campuses.
Supporting source ↗Operator reports construction progressing and second-building work beginning.
Supporting source ↗City grants permission for the third phase and early commencement of construction.
Supporting source ↗City anticipates operation around 2027; operator has not announced an actual commissioning date.
Supporting source ↗Municipal sale area; not necessarily the complete campus footprint.
Source ↗2024 EIA indexed text only; direct PDF access failed. Later permits describe three buildings, so this is historical assessed scope.
Source ↗Two-part project area in January 2023 decision; scope differs from purchased land and later EIA area.
Source ↗Three buildings described by 2025 permit records; retained within one campus candidate.
Source ↗Operating Fortum heat plants initially use ambient air and electric boilers; this does not establish data-center operation. Regional heat percentages and heat-plant MW are not data-center electrical capacities.
Source ↗Published operator project mailbox; no contact made.
Source ↗Source attribution does not imply independent verification or permission to reuse images.
Published Date unavailable · Retrieved 2026-10-07
Rolling operator updates: May 2026 reports construction progressing and the second building beginning; identifies Hepokuja 2 as an event location and Hepokorventie as site access. September 2024 notice schedules earthworks.
Published 2026-04-28 · Retrieved 2026-10-07
Microsoft confirms second-phase investment across Espoo, Kirkkonummi and Vihti; first-phase construction expected to finish around the 2026–2027 year boundary, followed by commissioning preparations. Cloud and AI services are the intended use.
Published 2023-12-13 · Retrieved 2026-10-07
City reports sale of approximately 21.6 hectares in Hepokorvenkallio, Högnäs, to Microsoft 3465 Finland Oy; site lies along Ring III.
Published 2025-03-20 · Retrieved 2026-10-07
Municipal permit consultation identifies applicant-owned property at Hepokorvenkaari 1, buildings HEL16–HEL18, and approximately 60 MW electrical capacity for the HEL16 application.
Published 2025-10-30 · Retrieved 2026-10-07
Records environmental permit issued 7 October 2025 for HEL16; describes three buildings and phased construction and commissioning during 2026–2028.
Published 2026-06-12 · Retrieved 2026-10-07
City reports third-phase building permission granted 11 June 2026; earlier two phases on the northern plot are permitted and construction is underway.
Published 2026-06-05 · Retrieved 2026-10-07
City identifies Microsoft as developer and operator, Fortum as heat-recovery partner, and initial operation expected around 2027 within the wider three-campus region.
Published 2026-05-06 · Retrieved 2026-10-07
Hepokorpi and Kolabacken heat plants are operating using ambient-air heat pumps and electric boilers; Microsoft waste-heat integration is expected to begin in phases in 2027.
Published Date unavailable · Retrieved 2026-10-07
Public indexed original-source text reports approximately 173 MW IT capacity, approximately 28 hectares and four buildings in the assessed alternative. Direct PDF opening failed; document date supplied by lead was not independently confirmed.
Published 2023-01-11 · Retrieved 2026-10-07
Opened government PDF describes a planned maximum 173 MW project and an approximately 40-hectare two-part project area north of Ring III between Hepokorpi and Tollinmäki; capacity basis is unspecified.
Published 2026-09-30 · Retrieved 2026-10-07
Recent city update confirms Microsoft construction traffic uses Hepokorventie and Hepokorvenkaari and discusses continuing temporary arrangements.
Name: Espoo datacenter project updates; Espoo sold land in Hepokorpi to Microsoft for data centre project
Aliases: Espoon datakeskus – Ympäristövaikutusten arviointi; Espoo sold land in Hepokorpi to Microsoft for data centre project
Kind: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Hepokorven datakeskuksen kolmannelle vaiheelle rakennuslupa
Country: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Fortum has started heat production at two large data centre sites in Finland
City: Espoo sold land in Hepokorpi to Microsoft for data centre project; Ympäristö- ja rakennuslautakunta 20.03.2025 §49
Metro: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Fortum has started heat production at two large data centre sites in Finland
Address: Ympäristö- ja rakennuslautakunta 20.03.2025 §49; Ympäristö- ja rakennuslautakunta 30.10.2025 §141
Operator: The Hepokorpi Project: Data center supporting Espoo’s Carbon-Neutral Future
Owner: Espoo sold land in Hepokorpi to Microsoft for data centre project; Ympäristö- ja rakennuslautakunta 20.03.2025 §49
Business Model: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; The Hepokorpi Project: Data center supporting Espoo’s Carbon-Neutral Future
Statuses: Espoo datacenter project updates; Hepokorven datakeskuksen kolmannelle vaiheelle rakennuslupa; Changes to traffic arrangements in Hepokorpi
Summary: Microsoft käynnistää pääkaupunkiseudun datakeskusalueen toisen vaiheen rakentamisen; Ympäristö- ja rakennuslautakunta 20.03.2025 §49; The Hepokorpi Project: Data center supporting Espoo’s Carbon-Neutral Future; Espoon datakeskus – Ympäristövaikutusten arviointi
Location: Espoo datacenter project updates; Ympäristö- ja rakennuslautakunta 20.03.2025 §49; EIA requirement decision UUDELY/6968/2022
Stable identifier: 9678aa7d-5133-41a7-9e4d-67e341028fb0