CyrusOne PAR1 Paris Data Center Campus
- Planned critical IT
- 27 MW
- Updated
- Oct 28, 2026
On April 2, 2026, the Versailles administrative appeal court rejected the challenge to CyrusOne’s November 2021 environmental registration at Wissous. This regulatory decision does not establish commissioning of PAR1’s expansion or approval of every future phase. CyrusOne PAR1 Paris Data Center Campus, also known as CyrusOne PAR1, is a partially operational data center campus in Wissous, IDF, FR associated with CyrusOne. Six planned data halls across three phases; 27 MW total design; 4.5 MW identified as operating on the current profile. Phased Paris-region campus with dual redundant power, closed-loop cooling and renewable-energy sourcing. 4.5 MW is the current operating-phase design. The separate 27 MW figure is the six-hall, three-phase full-build plan.
Capacity
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
3 buildings
4.5 MW operating + 6.9 MW non-operational + 15.6 MW authorization-stage = 27 MW full design.
4.5 MW is the current operating-phase design. The separate 27 MW figure is the six-hall, three-phase full-build plan.
Milestones (3)
Aug 29, 2026 · Recorded actual event
Completed · Commercial operation
Source not linkedAug 29, 2026 · Recorded actual event
Completed · Permit filed
Source not linkedAug 30, 2026 · Recorded actual event
Completed · Capacity revised
Source not linkedParticipants
Developer
Sources by role
Developer (1)
- CyrusOne CyrusOne PAR1 profile · Aug 28, 2026 · Primary
Site & development
Additional project facts
Capacity basis
ActualCyrusOne publishes 27 MW of critical IT capacity for this record boundary.
SourceCapacity basis
Actual4.5 MW is the current operating Phase 1 IT boundary. The remaining 22.5 MW belongs to non operational or authorization stage phases within the 27 MW full design.
SourceCapacity basis
Actual4.5 MW is the current operating phase design. The separate 27 MW figure is the six hall, three phase full build plan.
SourceInfrastructure & permits
Technical details (5)
Energized
Resilient utility supply, efficient closed-loop cooling, carrier-neutral connectivity and heat-reuse readiness.
Operational
CyrusOne describes closed-loop or air-cooled systems; the profile does not infer facility water use beyond the cited site specification.
Energized
Phased Paris-region campus with dual redundant power, closed-loop cooling and renewable-energy sourcing.
Operational
Cooling and efficiency claims remain limited to source-defined designs; no delivered load or water use is inferred.
Planned or represented
4.5 MW current design
Current phase is distinct from the 27 MW full-build plan.
Project map
Public-source research. Plans may change. See Evidence for sources and qualifications.