Data Center Campus
Data4: Nozay PAR03 Campus
Data4's PAR03 campus in Nozay, about 18 km south of Paris, is rising on the former Nokia (ex-Alcatel-Lucent) site 2 km from Data4's Marcoussis campus, with a direct 225 kV connection to the RTE grid. Building work began in 2026, with phases planned through 2030.
Campus at a Glance
Data4's PAR03 campus is at 7 Route de Villejust in Nozay (Essonne), in the Paris-Saclay agglomeration about 18 km south of Paris and 2 km northeast of Data4's PAR01 campus in Marcoussis. The project company is DATA 4 NOZAY SAS. Data4 is owned by Brookfield Infrastructure.
- Land: Data4 bought about 23 ha of Nokia's Paris-Saclay site (cadastral parcels Nozay AA 10, 18, 19 and 20), announced in April 2023. The fenced PAR03 site takes about 12.5 ha on the western part, with about 4.8 ha of building footprint. Nokia buildings remain to the east.
- History: The land was an Alcatel-Lucent, then Nokia, office and research site. Data4 first planned eight data centers here. In May 2025 it relaunched PAR03 as an AI campus and doubled the planned investment to €2 billion. About fifteen Nokia buildings, including a nine-storey tower, came down between August 2024 and May 2025.
- Permits: The environmental authorization, RTE's public-utility declaration for the grid link and three building permits went through one public inquiry from December 2025 to January 2026. The inquiry commissioner gave favorable opinions in February 2026, and the prefecture's decision is dated May 2026.
- Power: RTE is building a double underground 225 kV line of about 3.6 km from its new Escargot substation beside PAR01, and is reinforcing the Les Loges - Escargot 225 kV link. An on-site building holds two 225 kV substations with four 85 MVA transformers. Backup comes from 85 generators of 3.2 MW each running on HVO 100, plus two small units for the administration building.
- Cooling and heat reuse: The data halls use direct liquid cooling. A heat-recovery building will send waste heat to Nozay's planned eco-district.
- Positioning: Data4 markets PAR03 as an AI-focused twin of its Marcoussis campus.
Buildings
Sites on this Campus
| Site | Operator | Status | Operational | Building Size | Built |
|---|---|---|---|---|---|
| Data4: PAR03 DC1 | DATA4 Group |
Under ConstructionPlanned
|
— | — | 2027 |
| Data4: PAR03 DC2 | DATA4 Group |
Planned
|
— | — | 2029 |
| Data4: PAR03 DC3 | DATA4 Group |
Planned
|
— | — | 2030 |
Map and Nearby Locations
Data4: Nozay PAR03 Campus Power Growth Over Time
Campus Photos
Developer
Created in 2006 by Colony Capital, DATA4 is the European specialist in the construction and operation of ultra-secure data centers for French and international companies in the digital, manufacturing, service and banking and insurance sectors, who are seeking to outsource their data.
DATA4 manages flexible, high-performance and carrier- and cloud-neutral data centers, offering solutions from one colocation rack all the way through to purpose-built, dedicated facilities.
DATA4 Group operates data centers in France, Italy and Luxembourg, with a total net technical area of 22,000m² of IT rooms and more than 32 MW of IT power.
Company History:
2006: Creation of DATA4, joint venture between Alcatel, French telecommunications giant, and Colony Capital, international investment fund.
2007: The first client is hosted on the Paris campus
2009: The third building comes on line
2010: The fourth building comes on line
2011: The fifth building comes on line
2012: The sixth building comes on line and incorporates a high-density room.
2012: Acquisition of 3 data centers in Luxembourg, from Secure IT
2013: Creation of the Milan campus
2014: The first client from Milan is hosted
2015: A new executive committee is appointed to support the Group's growth targets.
2015: Second and third buildings in Milan comes on line