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CyrusOne MIL1 Milan Data Center Campus

Segrate, Lombardy, ItalyUnder construction
Evidence
Planned critical IT
27 MW
Updated
Oct 28, 2026

CyrusOne announced groundbreaking at MIL1 on March 25, 2026. Its current project page targets the first phase for the third quarter of 2027; planned campus capacity is not operating capacity. CyrusOne MIL1 Milan Data Center Campus, also known as CyrusOne MIL1, is a data center project in Segrate, Lombardy, IT associated with CyrusOne. 18.5-acre site; one three-story building; three 9 MW data halls; 9,000 square metres; 27 MW initial IT capacity. East Milan development with free-cooling, renewable-energy design, heat recovery and phased delivery. The earlier 27 MW figure describes the initial three-hall building scope, not the full campus plan.

Capacity

Reported capacity

Design

27 MW

Source

Reported capacity

Planned / design or future potential

27 MW

Source

Operating IT capacity: Not established in published records

A missing figure does not mean zero. Planned, utility and generation figures are not operating IT capacity.

Development

Development, permitting and phased deliveryUnder construction

27 MW is the operator-published future facility or full-build design boundary. It is not operating IT load.

Participants

CyrusOne

Developer

Sources by role
Developer (1)

Site & development

Location context

Actual

CyrusOne MIL1 | Segrate | Lombardy | IT

Source

Location context

Actual

CyrusOne MIL1 | Segrate | Lombardy | IT

Source

Location context

Actual

Segrate, Lombardy, IT

Source

Development detail

Actual

18.5-Acre site; one three story building; three 9 MW data halls; 9,000 square metres; 27 MW initial IT capacity.

Source

Additional project facts

Lifecycle status

Actual

Construction

Source

Capacity basis

Actual

CyrusOne publishes 27 MW of critical IT capacity for this record boundary.

Source

Lifecycle status

Actual

Construction

Source

Capacity basis

Actual

27 MW is the operator published future facility or full build design boundary.

Source

Project boundary

Actual

CyrusOne MIL1

Source

Lifecycle status

Actual

Construction

Source

Capacity basis

Actual

27 MW is the operator published future facility or full build design boundary.

Source

Infrastructure & permits

Technical details (2)
Electric grid

Planned or represented

East Milan development with free-cooling, renewable-energy design, heat recovery and phased delivery.

Cooling system

Planned or represented

Operator describes resilient cooling; Public sources do not establish water use or delivered capacity beyond the cited project specification.

Other · Issued

CyrusOne Segrate data center

Comune di Segrate

Aug 29, 2026

Sources (1)

Public-source research. Plans may change. See Evidence for sources and qualifications.

Related projects (1)
CyrusOne MIL2 Milan Data Center Campus

Under construction · Milan, Lombardy, Italy

Shared participant: CyrusOne · Same market: Lombardy, Italy

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