STACK Infrastructure MIL02A Milan Data Center: 5.6MW Colocation Hub
Status: Fully Operational Hub | Location: Via Marche 9, 27010 Siziano (PV), Lombardy, Italy
Project Overview
STACK Infrastructure’s MIL02A is a flagship hyperscale-ready data center located in Siziano, approximately 15 km south of downtown Milan, Italy, within one of the country’s most important digital infrastructure corridors. The facility delivers 5.6 MW of critical IT capacity across approximately 9,000 m² (97,000 sq ft) of purpose-built space and is designed to support hyperscale cloud providers, enterprise IT environments, content delivery platforms, and next-generation artificial intelligence (AI) and high-performance computing (HPC) workloads. Engineered for high-density deployments, MIL02A accommodates rack power densities ranging from 25 kW to 40 kW per cabinet, providing the flexibility required for modern compute-intensive applications. Powered entirely by 100% renewable electricity, the facility reflects STACK Infrastructure’s commitment to sustainable and energy-efficient digital infrastructure. As a carrier-neutral data center, MIL02A offers direct fiber cross-connects to the Milan Caldera Campus, home to Italy’s primary internet exchange and one of the country’s most significant connectivity hubs, enabling low-latency access to major carriers, cloud platforms, and enterprise networks. The facility incorporates N+1 redundant electrical and cooling systems, resilient backup power infrastructure, advanced physical security, and continuous operational monitoring to support a 100% service level agreement (SLA) for uptime. With scalable infrastructure, high-performance connectivity, and strategic proximity to Milan’s digital ecosystem, MIL02A provides a future-ready platform for missi
Quick Facts
| Field | Value |
|---|
| Project Name | STACK Infrastructure MIL02A Milan Data Center: 5.6MW Colocation Hub |
| Location | Via Marche 9, 27010 Siziano (PV), Lombardy, Italy |
| Status | Fully Operational Hub |
| Commissioning | Operational / Strategic Regional Expansion Hub |
| Total IT Load | 5.6 MW Critical IT Power Capacity Allocation |
| Total Capacity | 5.6 MW Critical IT Load across a 4.8-acre (~19,400 m²) campus footprint with 9,000 m² (~97,000 sq ft) total facility area |
| Tier Level | Tier III Certified Architecture / ISO 9001, ISO 14001, ISO 27001, ISO 45001, ISO 50001, SA 8000, PCI-DSS Compliant |
| Project Type | Purpose-Built High-Density Colocation, Enterprise Cloud & Interconnection Hub |
City Profile
| Header | Details |
|---|
| City Name | Milan |
| Population | ~1.4 million |
| Urban Agglomeration | ~3.2 million |
| City GDP | ~USD 220–240 billion |
| Per Capita Income | ~USD 60,000–65,000 |
| City Tier | Alpha Global City |
| Key Strengths | Global financial and fashion capital |
Companies Involved
| Header | Details |
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| Developer / Operator | STACK Infrastructure |
| Strategic Infrastructure Partner | Terna / Enel Utility Infrastructure & Siziano Municipal Authorities |
| Construction Contractor | Specialized European Mission-Critical General Contractors |
| MEP Engineering | STACK Infrastructure Global Critical Facilities Engineering Teams |
| Network Connectivity | Carrier-neutral platform with dual Meet-Me-Rooms (MMRs) and diverse subterranean fiber entrance vaults; 200+ dedicated fiber couples providing direct low-latency connectivity to the Milan Caldera IXP and regional fiber backbones. |
| Power Infrastructure | Dual high-voltage grid utility connections, static distributed N+1 uninterruptible power supply (UPS) modules, 2N PDU power distribution, automated switchgear, and backup diesel generator plants with up to 80 hours of on-site fuel autonomy. |
Technical Specifications
| Header | Details |
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| Power Capacity | 5.6 MW Secured Critical IT Utility Allocation |
| UPS Redundancy | N+1 Distributed Redundant UPS Architecture (with 2N PDU Distribution) |
| Cooling System | High-efficiency N+2 Air Handling Units (AHUs), closed-loop chilled-water systems, high-density airflow management, Direct-to-Chip Liquid Cooling (DLC) readiness, and automated BMS environmental controls. |
| Connectivity | Carrier-neutral host offering direct low-latency cloud express on-ramps, metro wave links, and cross-connect options across Southern European fiber corridors. |
| PUE Target | < 1.30 Annualized Operational Design PUE |
| Energy Mix | 100% Certified Carbon-Free Renewable Energy integration via regional power purchase agreements (PPAs). |
Milestones
| Header | Details |
|---|
| Announcement | 2020–2021 |
| Construction Start | 2021 |
| Phase 1 Go-Live | Operational |
| Full Buildout | Operational Active Building |
Investment Details
| Header | Details |
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| Total Investment | Estimated €40,000,000 EUR to €60,000,000 EUR Campus Capital Expenditure |
| Funding | Corporate Capital Expenditure & Infrastructure Financing by STACK Infrastructure / Apollo Global Management |