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STACK STO01 Upplands Väsby Data Center Campus

Upplands Väsby, Stockholm County, SwedenPartially operational
Capacity
18 MW
Planned critical IT
Lead participant
STACK Infrastructure
Developer · Operator
Last updated
Aug 28, 2026
Most recent public record update

About STACK STO01 Upplands Väsby Data Center Campus

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

Planned critical IT
Operating capacityAn operating IT-capacity figure has not been publicly disclosed.
It Load18 MWDesign · STACK STO01 Upplands Väsby Data Center Campus
It Load12 MWDesign · STACK STO01 Upplands Väsby Data Center Campus

Development

1 phases · 1 milestones
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.

Aug 29, 2026
Project-specific evidence refreshed and reconciled
Completed

Infrastructure

Electric GridOperational

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 Cartis uses the current operator figure and preserves the historical 18 MW as superseded context.

FiberOperational

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

Cooling SystemOperational

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

Project map

0 of 1 project point mapped
Infrastructure facts
3
Mapped records
1
Capacity figures
1

No map point available

Power & interconnection: 1Cooling & water: 1Fiber & connectivity: 1

Facts & sources

Published claims and their source links.

16 facts
Location Context
STACK STO01 | Upplands Väsby | Stockholm County | SE
Actual
Lifecycle Status
Partially operational
Actual
Reported Capacity
18 MW
Design
Capacity Basis
STACK Infrastructure publishes 18 MW of critical IT capacity for this record boundary.
Actual
Location Context
STACK STO01 | Upplands Väsby | Stockholm County | SE
Actual
Lifecycle Status
Partially operational
Actual
Reported Capacity
12 MW
Design
Capacity Basis
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.
Actual
Operator Or Developer
STACK Infrastructure
Actual
Project Location
Upplands Väsby, Stockholm County, SE
Actual
Current Lifecycle
Operating or in phased operation
Actual
Capacity Classification
It load
Actual
Capacity Basis
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.
Actual
Customer Utilization
Not publicly disclosed
Actual
Source Refresh Date
2026-08-29
Actual
White Space
5,600 square metres
Actual