Data4: Marcoussis PAR01 Campus

Data4's PAR01 campus is on Route de Nozay in Marcoussis (Essonne), in the Paris-Saclay technology cluster about 25 km southwest of Paris. Data4 markets it at 3 Route de Marcoussis, 91620 Nozay.

• Land: two cadastral parcels (Marcoussis B 66 and B 83, about 104 ha). The data center zone covers about 26 ha. Data4 keeps about 70 ha of classified woodland, the "Grand Parc".
• History: The Compagnie Générale d'Électricité opened a research center here in the late 1950s. The site passed to Alcatel and Alcatel-Lucent. Data4, created in 2006 by Colony Capital with Alcatel, bought the site at the end of 2006 and redeveloped it from 2007. AXA IM Alts acquired Data4 in 2018 and Brookfield Infrastructure in 2023.
• Growth: first-generation rounded halls around a central pond, the Alcatel-era D3 building, standardized single-storey halls from 2017, and larger halls in the western Zone 2 and Zone 2 Nord extensions. The prefecture authorized Zone 2 Nord in May 2024.
• Power: two underground 90 kV lines from RTE's Villejust substation (400/225/90 kV) feed an on-site customer substation. RTE is building a new 225 kV substation ("Escargot") beside the campus next to Data4's E&F substation. The same node will feed Data4's PAR03 campus in Nozay through a 3.6 km double underground 225 kV line. At full build the site holds 151 backup generators (612 MW thermal input) and 87 buried fuel tanks; the fleet now runs on HVO.
• Tenants: a major French bank (main customer in DC1), Amazon Web Services (on-site media destruction registered with the prefecture), and Cyllene. Data4 serves CAC 40 companies, IT service firms and large public and sovereign cloud platforms.
• Sister campuses: PAR02 (the DUAL building, Rue Marin Angiboust, Marcoussis) and PAR03 (former Nokia site, Nozay).