Data center campus
DC4
DC4 is a tracked AI data center campus in Paris. 8,000 m2 across six floors in a former Cold-War-era fallout shelter in the 15th arrondissement. Acquired by Iliad in 2011.
Capacity: announced vs energized
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Key facts
Reported facts
Structured facts sourced from citations already on this record. Each fact traces to a source in the References section below.
- Former nuclear fallout shelter / fr-par-3 (primary Scaleway)
- Scaleway's Jul 30 2022 blog describes fr-par-3 (project codename DC4) as a former nuclear fallout bunker originally called Abri Lefebvre, built 1937-1939 under the Ponts et Chaussees laboratory in Paris, later converted for Civil Aviation nuclear fallout use in the 1960s, acquired by Online SAS (now Scaleway SAS) via public tender in September 2012, and upgraded in 2021 from a Data Bunker (C14 cold storage since 2016) to a full-fledged availability zone for Paris multi-AZ (Scaleway, Jul 30 2022)
- 26 m depth / limestone overburden (primary Scaleway)
- The same Scaleway post says the laboratory sits atop an empty 17th-century quarry 26 meters deep protected by a 10 meters thick limestone deposit, and that insurance and certifications required Scaleway to preserve fallout-shelter characteristics including sustaining a total demolition of the building at ground level. Frame depth and structural claims as operator historical description (Scaleway, Jul 30 2022)
- PUE 1.44 / WUE 0.00002 (primary Scaleway)
- Scaleway's environmental leadership page lists DC4 Paris with PUE 1.44, WUE 0.00002, power sourced as 100% wind or hydro via Guarantee of Origin, and cooling described as EC (direct) with variable compressor (VRV). Treat PUE/WUE as operator-published 2024 key indicators (Scaleway Environmental Leadership)
On the data center map
Every tracked data center is on this map, centered on DC4. Pan or zoom out to see how close rivals are building.
The deal
- developer
- Scaleway
Power
- Power source
- grid
- Interconnection
Why here
DC4 is in Paris. It draws on grid power. This siting summary is composed from the record's held fields, not speculation; see methodology.
Regulatory paper trail
The filings and rules on record for this site and its jurisdiction, most recent first. Each is a sourced, dated artifact you can follow to the primary document.
Sources
- DC4 — scaleway facility
- Transforming a nuclear fallout shelter into a data center in Paris
- Environmental leadership
95a9acc3-5f71-45e3-b502-01cad2589989 · Tracked with DEPLOY's verified-vs-claimed methodology. Every term is defined in the glossary. Announced numbers are claims, not built capacity.
Head-to-head
Common questions
What is DC4?
Who is building DC4?
Is DC4 operating yet?
How verified is the data on DC4?
Deploy Watch
Track DC4 on Deploy.
We notify you when energized capacity, lifecycle state, or a new dated capacity claim changes against primary-source evidence, not when the developer issues a press release.
Cite this page
DEPLOY. (2026). DC4: AI data center campus record. Retrieved October 11, 2026, from https://registry.deploy.report/datacenters/scaleway-dc4
More citation formats (MLA, Chicago, BibTeX) →The verified data on this page is available under a Creative Commons Attribution 4.0 license: reuse the facts freely, with attribution to DEPLOY (deploy.report). The prose, design, and any imagery are not included and keep their own rights.
Machine-readable surfaces
- Markdown mirror: /datacenters/scaleway-dc4.md
- JSON-LD: embedded in this page’s head
- REST API: /v1/datacenters/scaleway-dc4
- Data documentation: /data
- Query this programmatically: Deploy MCP