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CARTIS

STACK STO01 Upplands Väsby Data Center Campus

Upplands Väsby, Stockholm County, SwedenPartially operational
Evidence
Planned critical IT
18 MW
Updated
Oct 28, 2026

STO01 in Upplands Väsby is now operated by Vaultica after the Apollo-backed STACK colocation carve-out. Vaultica currently reports 12 MW and 5,600 square metres; the legacy STACK record reported 18 MW. Customer utilization, private contract terms and unreported project financing remain outside the verified public record.

Capacity

Reported capacity

Design

18 MW

Source

Reported capacity

Design

12 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

Operating facility and documented expansionOperational

STO01 in Upplands Väsby is now operated by Vaultica after the Apollo-backed STACK colocation carve-out. Vaultica currently reports 12 MW and 5,600 square metres; the legacy STACK record reported 18 MW. Customer utilization, private contract terms and unreported project financing remain outside the verified public record.

Milestones (1)
Project-specific evidence refreshed and reconciled

Aug 29, 2026 · Recorded actual event

Completed · Status changed

Source not linked

Participants

STACK Infrastructure

Developer · Operator

Sources by role
Developer (1)
Operator (1)

Site & development

Location context

Actual

STACK STO01 | Upplands Väsby | Stockholm County | SE

Source

Location context

Actual

STACK STO01 | Upplands Väsby | Stockholm County | SE

Source

Project location

Actual

Upplands Väsby, Stockholm County, SE

Source

Additional project facts

Lifecycle status

Actual

Partially operational

Source

Capacity basis

Actual

STACK Infrastructure publishes 18 MW of critical IT capacity for this record boundary.

Source

Lifecycle status

Actual

Partially operational

Source

Capacity basis

Actual

Vaultica currently reports 12 MW for STO01; the legacy STACK profile reported an 18 MW building boundary. Cartis uses the current operator figure and preserves the historical 18 MW as superseded context.

Source

Operator or developer

Actual

STACK Infrastructure

Source

Current lifecycle

Actual

Operating or in phased operation

Source

Capacity classification

Actual

It load

Source

Capacity basis

Actual

Vaultica currently reports 12 MW for STO01; the legacy STACK profile reported an 18 MW building boundary. Cartis uses the current operator figure and preserves the historical 18 MW as superseded context.

Source

Customer utilization

Actual

Not publicly disclosed

Source

Source refresh date

Actual

2026-08-29

Source

White space

Actual

5,600 square metres

Source

Infrastructure & permits

Technical details (3)
Electric grid

Operational

12 MW

Vaultica currently reports 12 MW for STO01; the legacy STACK profile reported an 18 MW building boundary. Cartis uses the current operator figure and preserves the historical 18 MW as superseded context.

Fiber

Operational

Renewable-power communications campus with expansion-ready connectivity north of Stockholm.

Cooling system

Operational

Cooling and resilience architecture is described at facility or campus level; instantaneous draw and tenant utilization remain undisclosed.

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