Data centre construction site in Finland in winter — steel frame hall, tower crane and construction workers in high-visibility clothing

Site tracking · updated daily · every fact with its date

Where data centres are being built in Finland — and where you would live

We follow municipal decisions, environmental assessments, permits and announcements for every data-centre project in Finland, every day. This page is the public part: which sites exist, who owns them, what stage they are at and where our housing is. Contractors are not named until we work with them.

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The big picture, dated

On 9 September 2026 Google announced a 13 billion € investment in Finland over two years (Google Cloud press release). In Muhos the environmental impact assessment programme (16 September 2025) covers a data-centre area of 571 ha with 9 buildings. On 21 September 2026 the municipality of Muhos invited businesses to an event on 8 October 2026, 17:00–19:00, on expanding worker accommodation (muhos.fi).

For a worker this means two things: the mechanical and electrical phase — electricians, pipefitters, welders, HVAC, sprinkler and insulation trades — runs for years on several sites at once, and housing near the northern sites is scarce. Our own housing for up to 400 people is near Kajaani and Kuhmo, with our own transport to site.

Sites we track

Sites we track
City	Site	Owner	Stage	Peak	Trades	Housing	Travel
Hamina	Google data-centre campus, Summa (registry: Palvelinkeskus Hamina)	Google (registry project company: Tuike Finland Oy)	Operating — expansion announced (Google, 9 September 2026)	Google plans at least 13 billion € in Finland in 2027–2028 across Hamina, Kajaani, Muhos and Vaala (Google, 9 September 2026). Timing and size of the Hamina works: not published as of 25 September 2026.	Expansion on a live campus: shell trades at the start of each new building, then the long mechanical and electrical phase (electricians, busbar and MV/HV fitters, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS) and commissioning. Dates not published.	No Gene-Works housing in Kymenlaakso; accommodation is arranged per assignment.	Summa area, Hamina (registry location). Own transport to site is arranged by Gene-Works.
Kajaani	Google data-centre area, Otanmäki–Alussuo (registry: Palvelinkeskus Kajaani-Otanmäki)	Google (registry project company: Tuike Finland Oy)	Preparatory works — permits pending (registry, 23 September 2026; Lupa- ja valvontavirasto, 18 September 2026: the detailed plan is appealed, a building ban applies, the EIA is still in progress)	Main construction 2027–2028 under Google's two-year programme (Google, 9 September 2026). Site headcount and peak year: not published.	Greenfield site: shell trades first (steel fixers, precast and steel erectors, roofers/fall protection, crane and lifting) — start depends on permits; then the long mechanical and electrical phase (electricians, busbar, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS); commissioning towards the end.	Accommodation available nearby through Gene-Works (Kajaani area).	Otanmäki, Kajaani (registry location). Own transport to site is arranged by Gene-Works.
Muhos	Google data-centre area, Pyhänselkä / Leppiniemi — 571 ha, 9 buildings in the EIA programme (ymparisto.fi, 16 September 2025; registry: Palvelinkeskus Muhos)	Google (registry project company: Tuike Finland Oy)	EIA in progress — preparatory works (registry, 23 September 2026)	Main construction 2027–2028 under Google's two-year programme (Google, 9 September 2026). "Over 2,000 construction workers" is an estimate quoted by Yle on 10 September 2026 — not a confirmed figure. The municipality is working towards 1,000 new beds for construction workers and holds a business event on 8 October 2026, 17:00–19:00 (muhos.fi, 21 September 2026).	Greenfield, nine buildings: shell trades (steel fixers, precast and steel erectors, roofers/fall protection, scaffolders, crane and lifting) from the permit date; then the long mechanical and electrical phase (electricians, busbar, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS, standby power); commissioning building by building.	Accommodation available nearby through Gene-Works; the municipality is expanding worker accommodation (muhos.fi, 21 September 2026).	Leppiniemi / Pyhänselkä, Muhos, Oulu region (registry location). Own transport to site is arranged by Gene-Works.
Vaala	Data-centre area, Nuojua–Järvikylä (registry: Vaalan datakeskus)	Google named Vaala in its 9 September 2026 announcement and the municipality reported Google's land purchase (vaala.fi); the registry lists the Nuojua–Järvikylä EIA under a different applicant (Erikoissijoitusrahasto UB Uusiutuva Energia) — the relationship between the two is not confirmed.	EIA in progress (registry, 23 September 2026)	Main construction 2027–2028 under Google's two-year programme (Google, 9 September 2026); the Vaala schedule and size are not published.	Not before permits: shell trades first, then the mechanical and electrical phase (electricians, pipefitters, pipe welders, HVAC, sprinkler, BMS) and commissioning.	Accommodation available nearby through Gene-Works (Kajaani area).	Nuojua–Järvikylä, Vaala (registry location). Own transport to site is arranged by Gene-Works.
Kirkkonummi	Microsoft data centre, Kolabacken / Sundsberg (registry: Kirkkonummen datakeskus); site works under way since 2025 (kirkkonummi.fi, 27 June 2025)	Microsoft (registry project company: Microsoft 3465 Finland Oy)	Under construction (registry, 23 September 2026)	Phase 1 finishing around the turn of 2026–2027; phase 2 starting in 2026 (Microsoft, April 2026) — phases overlap, which keeps demand for trades continuous. Headcount on site: not published.	Phase 1 building: mechanical and electrical works now and into 2027 (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS, standby power), commissioning expected from 2027. Phase 2 building: shell trades (steel fixers, precast, roofers/fall protection, crane) from 2026.	Helsinki region; no Gene-Works housing here — accommodation is arranged per assignment.	Sundsberg, eastern Kirkkonummi, in the Helsinki commuter area (kirkkonummi.fi). Own transport to site is arranged by Gene-Works.
Espoo	Microsoft data-centre area, Hepokorpi (registry: Espoon datakeskusalue)	Microsoft (registry project company: Microsoft 3465 Finland Oy)	Under construction — second building since May 2026 (Microsoft construction update, May 2026)	About 3,500 people working on the project, peak about 7,500 (Microsoft project page, September 2026). Phase 1 finishing around the turn of 2026–2027, phase 2 starting in 2026 (Microsoft, April 2026).	Two buildings at different stages: shell trades (steel fixers, precast, steel erectors, roofers/fall protection, crane) on the second building; mechanical and electrical works (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS) on the first; commissioning of the first expected from 2027.	Helsinki region; no Gene-Works housing here — accommodation is arranged per assignment.	Hepokuja 2, 02940 Espoo (Microsoft, May 2026); Helsinki region. Own transport to site is arranged by Gene-Works.
Vihti	Microsoft data centre, Huhmari (registry: Vihdin datakeskus)	Microsoft (registry project company: Microsoft 3465 Finland Oy)	Under construction (registry, 23 September 2026)	Phase 1 to finish December 2026; phase 2 from 2026 (Microsoft, April 2026). Headcount on site: not published by the owner.	Phase 1 building: mechanical and electrical works through 2026 (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS), commissioning from late 2026 / 2027. Phase 2 building: shell trades from 2026 (steel fixers, precast, roofers/fall protection, crane).	Helsinki region (Nummela side); no Gene-Works housing here — accommodation is arranged per assignment.	Hankasalontie 12, 03150 Huhmari, Vihti (vihti.fi, 26 June 2024). Own transport to site is arranged by Gene-Works.
Kajaani	LUMI-AI data centre, Renforsin Ranta (conversion of a former paper-machine hall)	CSC – IT Center for Science Ltd	Under construction (registry, 23 September 2026)	A small site by data-centre standards; about half of the building-services workforce comes from Kainuu (press release, 3 September 2026). Commissioning planned for 2027.	Conversion, so mostly building services — electricians, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS — through 2026–2027; commissioning in 2027.	Accommodation available nearby through Gene-Works (Kajaani area).	Renforsin Ranta business park, Kajaani (registry location). Own transport to site is arranged by Gene-Works.
Kajaani	XTX Markets data centre, Tihisenniemi	XTX Markets Oy	Under construction (registry, 23 September 2026)	Schedule and headcount: not published as of 25 September 2026.	Greenfield: shell trades first (steel fixers, precast, steel erectors, roofers/fall protection, crane); mechanical and electrical phase to follow (electricians, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, BMS); then commissioning.	Accommodation available nearby through Gene-Works (Kajaani area).	Tihisenniemi, Kajaani (registry location). Own transport to site is arranged by Gene-Works.
Mäntsälä	Verne data-centre campus, Kapuli business area (second site: Nebius Mäntsälä 2, permitting)	Verne (under construction); Nebius (Mäntsälä 2, permitting)	Under construction (registry, 23 September 2026)	Schedule and headcount: not published as of 25 September 2026.	Verne: shell trades first, then the mechanical and electrical phase (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, standby power, BMS) and commissioning. Nebius 2: after permits.	North of the Helsinki region; no Gene-Works housing here — accommodation is arranged per assignment.	Kapuli business area, Mäntsälä (registry location). Own transport to site is arranged by Gene-Works.
Kouvola	atNorth FIN04, Myllykoski (further Hyperco and Nova Complex sites in Kouvola)	atNorth (FIN04); Hyperco Data Systems Oy and Nova Complex (other Kouvola sites)	Under construction (registry, 23 September 2026)	Schedule and headcount: not published as of 25 September 2026.	Shell trades first (steel fixers, precast, steel erectors, roofers/fall protection, crane); mechanical and electrical phase (electricians, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, standby power, BMS); then commissioning.	No Gene-Works housing in Kymenlaakso; accommodation is arranged per assignment.	Myllykoski industrial area, Kouvola (registry location). Own transport to site is arranged by Gene-Works.
Lappeenranta	Nebius AI data centre, Pajarila (registry: Pajarilan datakeskus)	Nebius	Under construction (registry, 23 September 2026)	Schedule and headcount: not published as of 25 September 2026.	Shell trades first; mechanical and electrical phase (electricians, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, standby power, BMS); then commissioning.	No Gene-Works housing in Etelä-Karjala; accommodation is arranged per assignment.	Pajarila, Lappeenranta (registry location). Own transport to site is arranged by Gene-Works.

HaminaGoogle

Site: Google data-centre campus, Summa (registry: Palvelinkeskus Hamina)
Owner: Google (registry project company: Tuike Finland Oy)
Stage: Operating — expansion announced (Google, 9 September 2026)
Peak: Google plans at least 13 billion € in Finland in 2027–2028 across Hamina, Kajaani, Muhos and Vaala (Google, 9 September 2026). Timing and size of the Hamina works: not published as of 25 September 2026.
Trades: Expansion on a live campus: shell trades at the start of each new building, then the long mechanical and electrical phase (electricians, busbar and MV/HV fitters, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS) and commissioning. Dates not published.
Housing: No Gene-Works housing in Kymenlaakso; accommodation is arranged per assignment.
Travel: Summa area, Hamina (registry location). Own transport to site is arranged by Gene-Works.

KajaaniGoogle

Site: Google data-centre area, Otanmäki–Alussuo (registry: Palvelinkeskus Kajaani-Otanmäki)
Owner: Google (registry project company: Tuike Finland Oy)
Stage: Preparatory works — permits pending (registry, 23 September 2026; Lupa- ja valvontavirasto, 18 September 2026: the detailed plan is appealed, a building ban applies, the EIA is still in progress)
Peak: Main construction 2027–2028 under Google's two-year programme (Google, 9 September 2026). Site headcount and peak year: not published.
Trades: Greenfield site: shell trades first (steel fixers, precast and steel erectors, roofers/fall protection, crane and lifting) — start depends on permits; then the long mechanical and electrical phase (electricians, busbar, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS); commissioning towards the end.
Housing: Accommodation available nearby through Gene-Works (Kajaani area).
Travel: Otanmäki, Kajaani (registry location). Own transport to site is arranged by Gene-Works.

MuhosGoogle

Site: Google data-centre area, Pyhänselkä / Leppiniemi — 571 ha, 9 buildings in the EIA programme (ymparisto.fi, 16 September 2025; registry: Palvelinkeskus Muhos)
Owner: Google (registry project company: Tuike Finland Oy)
Stage: EIA in progress — preparatory works (registry, 23 September 2026)
Peak: Main construction 2027–2028 under Google's two-year programme (Google, 9 September 2026). "Over 2,000 construction workers" is an estimate quoted by Yle on 10 September 2026 — not a confirmed figure. The municipality is working towards 1,000 new beds for construction workers and holds a business event on 8 October 2026, 17:00–19:00 (muhos.fi, 21 September 2026).
Trades: Greenfield, nine buildings: shell trades (steel fixers, precast and steel erectors, roofers/fall protection, scaffolders, crane and lifting) from the permit date; then the long mechanical and electrical phase (electricians, busbar, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS, standby power); commissioning building by building.
Housing: Accommodation available nearby through Gene-Works; the municipality is expanding worker accommodation (muhos.fi, 21 September 2026).
Travel: Leppiniemi / Pyhänselkä, Muhos, Oulu region (registry location). Own transport to site is arranged by Gene-Works.

VaalaGoogle named Vaala in its 9 September 2026 announcement and…

Site: Data-centre area, Nuojua–Järvikylä (registry: Vaalan datakeskus)
Owner: Google named Vaala in its 9 September 2026 announcement and the municipality reported Google's land purchase (vaala.fi); the registry lists the Nuojua–Järvikylä EIA under a different applicant (Erikoissijoitusrahasto UB Uusiutuva Energia) — the relationship between the two is not confirmed.
Stage: EIA in progress (registry, 23 September 2026)
Peak: Main construction 2027–2028 under Google's two-year programme (Google, 9 September 2026); the Vaala schedule and size are not published.
Trades: Not before permits: shell trades first, then the mechanical and electrical phase (electricians, pipefitters, pipe welders, HVAC, sprinkler, BMS) and commissioning.
Housing: Accommodation available nearby through Gene-Works (Kajaani area).
Travel: Nuojua–Järvikylä, Vaala (registry location). Own transport to site is arranged by Gene-Works.

KirkkonummiMicrosoft

Site: Microsoft data centre, Kolabacken / Sundsberg (registry: Kirkkonummen datakeskus); site works under way since 2025 (kirkkonummi.fi, 27 June 2025)
Owner: Microsoft (registry project company: Microsoft 3465 Finland Oy)
Stage: Under construction (registry, 23 September 2026)
Peak: Phase 1 finishing around the turn of 2026–2027; phase 2 starting in 2026 (Microsoft, April 2026) — phases overlap, which keeps demand for trades continuous. Headcount on site: not published.
Trades: Phase 1 building: mechanical and electrical works now and into 2027 (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS, standby power), commissioning expected from 2027. Phase 2 building: shell trades (steel fixers, precast, roofers/fall protection, crane) from 2026.
Housing: Helsinki region; no Gene-Works housing here — accommodation is arranged per assignment.
Travel: Sundsberg, eastern Kirkkonummi, in the Helsinki commuter area (kirkkonummi.fi). Own transport to site is arranged by Gene-Works.

EspooMicrosoft

Site: Microsoft data-centre area, Hepokorpi (registry: Espoon datakeskusalue)
Owner: Microsoft (registry project company: Microsoft 3465 Finland Oy)
Stage: Under construction — second building since May 2026 (Microsoft construction update, May 2026)
Peak: About 3,500 people working on the project, peak about 7,500 (Microsoft project page, September 2026). Phase 1 finishing around the turn of 2026–2027, phase 2 starting in 2026 (Microsoft, April 2026).
Trades: Two buildings at different stages: shell trades (steel fixers, precast, steel erectors, roofers/fall protection, crane) on the second building; mechanical and electrical works (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS) on the first; commissioning of the first expected from 2027.
Housing: Helsinki region; no Gene-Works housing here — accommodation is arranged per assignment.
Travel: Hepokuja 2, 02940 Espoo (Microsoft, May 2026); Helsinki region. Own transport to site is arranged by Gene-Works.

VihtiMicrosoft

Site: Microsoft data centre, Huhmari (registry: Vihdin datakeskus)
Owner: Microsoft (registry project company: Microsoft 3465 Finland Oy)
Stage: Under construction (registry, 23 September 2026)
Peak: Phase 1 to finish December 2026; phase 2 from 2026 (Microsoft, April 2026). Headcount on site: not published by the owner.
Trades: Phase 1 building: mechanical and electrical works through 2026 (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS), commissioning from late 2026 / 2027. Phase 2 building: shell trades from 2026 (steel fixers, precast, roofers/fall protection, crane).
Housing: Helsinki region (Nummela side); no Gene-Works housing here — accommodation is arranged per assignment.
Travel: Hankasalontie 12, 03150 Huhmari, Vihti (vihti.fi, 26 June 2024). Own transport to site is arranged by Gene-Works.

KajaaniCSC – IT Center for Science Ltd

Site: LUMI-AI data centre, Renforsin Ranta (conversion of a former paper-machine hall)
Owner: CSC – IT Center for Science Ltd
Stage: Under construction (registry, 23 September 2026)
Peak: A small site by data-centre standards; about half of the building-services workforce comes from Kainuu (press release, 3 September 2026). Commissioning planned for 2027.
Trades: Conversion, so mostly building services — electricians, pipefitters, pipe welders, HVAC, sprinkler, insulation, BMS — through 2026–2027; commissioning in 2027.
Housing: Accommodation available nearby through Gene-Works (Kajaani area).
Travel: Renforsin Ranta business park, Kajaani (registry location). Own transport to site is arranged by Gene-Works.

KajaaniXTX Markets Oy

Site: XTX Markets data centre, Tihisenniemi
Owner: XTX Markets Oy
Stage: Under construction (registry, 23 September 2026)
Peak: Schedule and headcount: not published as of 25 September 2026.
Trades: Greenfield: shell trades first (steel fixers, precast, steel erectors, roofers/fall protection, crane); mechanical and electrical phase to follow (electricians, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, BMS); then commissioning.
Housing: Accommodation available nearby through Gene-Works (Kajaani area).
Travel: Tihisenniemi, Kajaani (registry location). Own transport to site is arranged by Gene-Works.

MäntsäläVerne

Site: Verne data-centre campus, Kapuli business area (second site: Nebius Mäntsälä 2, permitting)
Owner: Verne (under construction); Nebius (Mäntsälä 2, permitting)
Stage: Under construction (registry, 23 September 2026)
Peak: Schedule and headcount: not published as of 25 September 2026.
Trades: Verne: shell trades first, then the mechanical and electrical phase (electricians, busbar, pipefitters, pipe welders, HVAC, sprinkler, standby power, BMS) and commissioning. Nebius 2: after permits.
Housing: North of the Helsinki region; no Gene-Works housing here — accommodation is arranged per assignment.
Travel: Kapuli business area, Mäntsälä (registry location). Own transport to site is arranged by Gene-Works.

KouvolaatNorth

Site: atNorth FIN04, Myllykoski (further Hyperco and Nova Complex sites in Kouvola)
Owner: atNorth (FIN04); Hyperco Data Systems Oy and Nova Complex (other Kouvola sites)
Stage: Under construction (registry, 23 September 2026)
Peak: Schedule and headcount: not published as of 25 September 2026.
Trades: Shell trades first (steel fixers, precast, steel erectors, roofers/fall protection, crane); mechanical and electrical phase (electricians, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, standby power, BMS); then commissioning.
Housing: No Gene-Works housing in Kymenlaakso; accommodation is arranged per assignment.
Travel: Myllykoski industrial area, Kouvola (registry location). Own transport to site is arranged by Gene-Works.

LappeenrantaNebius

Site: Nebius AI data centre, Pajarila (registry: Pajarilan datakeskus)
Owner: Nebius
Stage: Under construction (registry, 23 September 2026)
Peak: Schedule and headcount: not published as of 25 September 2026.
Trades: Shell trades first; mechanical and electrical phase (electricians, MV/HV, pipefitters, pipe welders, HVAC, sprinkler, standby power, BMS); then commissioning.
Housing: No Gene-Works housing in Etelä-Karjala; accommodation is arranged per assignment.
Travel: Pajarila, Lappeenranta (registry location). Own transport to site is arranged by Gene-Works.

Swipe the table sideways on a phone.

Stages follow the national data-centre registry (Lupa- ja valvontavirasto) and public announcements as of the date shown in each row. Peak periods are estimates unless a source is given; where a schedule or headcount has not been published, the cell says so. We do not name contractors. This page is not a list of vacancies. Site data: registry snapshot 23 September 2026, source pages checked 25–26 September 2026.

Towns from the site overview and Gene-Works housing areas. Dots mark settlements, not site addresses or boundaries. The map does not confirm contracts or vacancies. Map data: Natural Earth (public domain), GeoNames (CC BY 4.0).

How to read this table

Stage tells you how far a site is from needing your trade: assessment and permitting come first, then shell works, then the long mechanical and electrical phase, then commissioning. Peak is the period when the most people are on site — the best time to be in the pool with documents ready. Housing shows where you would live; Travel shows where the site is and how you get there daily.

Every row carries the date of the fact it is based on. When a site moves, the row changes. We send a short monthly update on sites and vacancies to everyone in the pool who asked for it.

Be in the pool before the peak — five fields, no files.

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