Kajaani
Finnish city ranking first globally for new data-centre siting: fast grid connections, sub-0.10 water stress, 8,000+ free-cooling hours per year.
Last refreshed: 6 May 2026 · Appears in 1 active topic
If Kajaani is the ideal data-centre location, why aren't more hyperscalers there?
Timeline for Kajaani
Ranked first on fast Fingrid connection, free cooling, and low water stress
Data Centres: Boom and Backlash: Where the next data centres should go- Why is Kajaani Finland a top location for data centres?
- Kajaani offers fast Fingrid grid connections without queue delays, WRI water stress under 0.10, 8,000+ free-cooling hours per year from the arctic climate, and brownfield industrial land from former pulp and paper sites. Microsoft has operated an Azure campus there since 2011.Source: Fortum / briefing analysis
- Where is Kajaani Finland?
- Kajaani is a city of about 35,000 people in north-central Finland, approximately 550 km north of Helsinki, in the Kainuu region.
- Does Microsoft have a data centre in Kajaani Finland?
- Yes. Microsoft has operated an Azure campus in Kajaani since 2011, making it one of the earliest hyperscaler investments in Nordic cold-climate cooling. Kajaani ranks first among global data-centre siting locations in the May 2026 briefing analysis.Source: Microsoft / Fortum
- What is free cooling in a data centre and why is Finland ideal for it?
- Free cooling uses outdoor air or water at ambient temperatures to cool IT equipment without mechanical refrigeration, dramatically reducing energy use. Finland's climate provides over 8,000 hours per year below the threshold needed for free cooling — nearly the entire year — making facilities like Kajaani and Tampere extremely energy-efficient.Source: Fortum
Background
Kajaani leads the global data-centre siting shortlist for 2026, according to briefing analysis combining grid, water, and consent metrics. Fingrid, Finland's National Grid operator, offers fast connections without a queue comparable to NESO (UK) or ERCOT (Texas); WRI Aqueduct rates Finnish baseline water stress at under 0.10 — effectively negligible; and the arctic climate provides more than 8,000 free-cooling hours per year, dramatically reducing the energy needed for cooling relative to equatorial or desert sites.
Kajaani is a city of approximately 35,000 people in the North Ostrobothnia and Kainuu region of central-northern Finland. It hosts a significant data-centre presence including a Microsoft Azure campus that has operated since 2011, one of the company's oldest and largest European DC sites. The city's former pulp and paper industry base left brownfield industrial land with existing heavy-power infrastructure — a combination that makes greenfield DC development faster and cheaper than in land-constrained coastal markets.
The binding constraints for Kajaani are not consent or supply but rural transmission capacity (the existing 400 kV backbone does not pass directly through the city) and a small operations-talent pool. Operators running GPU clusters at hyperscale typically need highly specialised electrical and cooling engineering staff; attracting and retaining that talent in a small city 550 km north of Helsinki is a genuine operational challenge.