Callio Data Center Campus

The Callio Data Center Campus in Pyhäjärvi, Finland, is a planned hyperscale-ready site repurposing the former Pyhäsalmi mine and surrounding brownfield land into a next-generation digital infrastructure hub. The campus spans 60 hectares, expandable to 100 hectares, with 25% building rights and access to underground facilities for secure or thermally optimized deployments.

Key features include:
* Up to 100 MW of surplus renewable electricity from Fingrid’s Haapajärvi substation with 99.9998% reliability
* 100% free cooling potential, with ambient temperatures rarely exceeding 25°C
* Lake water cooling infrastructure just 200 meters away
* 1G–100G open data connections, MPLS, L3 VPN, and Ethernet services
* Proximity to FICIX Oulu internet hub (165 km) and multiple backbone providers (Elisa, Telia, Cinia)

The site is designed to support AI, HPC, and cloud workloads, with waste heat recovery options for mine ventilation, district heating, and greenhouses. It benefits from strong local expertise in mining, energy, and industrial construction, and is positioned as a sustainable, secure, and cost-effective location for large-scale data center investment.