{"id":"95a9acc3-5f71-45e3-b502-01cad2589989","slug":"scaleway-dc4","name":"DC4","aliases":["Scaleway DC4"],"locationId":"d76af03b-968b-433e-a038-7797665a6d6b","lat":null,"lng":null,"locationPrecision":null,"landStatus":null,"lifecycleState":"energized","powerSourceMix":"grid","interconnectionQueueStatus":null,"interconnectionQueueId":null,"expectedEnergizationDate":null,"dedicatedSubstation":null,"gridOperator":null,"waterSourceNotes":null,"servingUtility":null,"acreage":null,"totalBuildingSqft":null,"streetAddress":null,"notes":"8,000 m2 across six floors in a former Cold-War-era fallout shelter in the 15th arrondissement. Acquired by Iliad in 2011.","keyFacts":[{"label":"Former nuclear fallout shelter / fr-par-3 (primary Scaleway)","value":"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](https://www.scaleway.com/en/blog/meet-fr-par-3/))","sourceUrl":"https://www.scaleway.com/en/blog/meet-fr-par-3/"},{"label":"26 m depth / limestone overburden (primary Scaleway)","value":"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](https://www.scaleway.com/en/blog/meet-fr-par-3/))","sourceUrl":"https://www.scaleway.com/en/blog/meet-fr-par-3/"},{"label":"PUE 1.44 / WUE 0.00002 (primary Scaleway)","value":"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](https://www.scaleway.com/en/environmental-leadership/))","sourceUrl":"https://www.scaleway.com/en/environmental-leadership/"}],"reviewStatus":"reviewed","sources":[{"url":"https://en.wikipedia.org/wiki/Scaleway","title":"DC4 — scaleway facility"},{"url":"https://www.scaleway.com/en/blog/meet-fr-par-3/","date":"2022-07-30","title":"Transforming a nuclear fallout shelter into a data center in Paris","publisher":"Scaleway"},{"url":"https://www.scaleway.com/en/environmental-leadership/","title":"Environmental leadership","publisher":"Scaleway"}],"reviewNote":null,"createdAt":"2026-08-28T02:10:58.542Z","updatedAt":"2026-09-29T10:44:54.450Z","location":{"id":"d76af03b-968b-433e-a038-7797665a6d6b","name":"Paris","slug":"paris-france","kind":"city","parentLocationId":"6445435c-a698-41e6-83be-1d944b475451","region":"Western Europe","lat":48.8566,"lng":2.3522,"reviewStatus":"reverified","aliases":["paris-ile-de-france-france","Paris, Île-de-France, France"],"collisionRisk":"high","reviewNote":null,"createdAt":"2026-06-07T22:50:05.483Z","updatedAt":"2026-08-11T00:19:34.705Z"},"parties":[{"id":"095f9830-4b20-41ad-8165-ba4c32ee56e4","dataCenterId":"95a9acc3-5f71-45e3-b502-01cad2589989","companyId":"a546f041-124c-4435-8d1c-c9ba8935861c","externalName":null,"role":"developer","structureNotes":null,"createdAt":"2026-08-28T02:10:59.434Z","company":{"id":"a546f041-124c-4435-8d1c-c9ba8935861c","name":"Scaleway","slug":"scaleway"}}],"capacityClaims":[],"financialClaims":[],"metricClaims":[],"powerProjects":[],"facilities":[],"incidents":[],"events":[],"capacity_picture":{"announced_gw":null,"contracted_gw":null,"under_construction_gw":null,"energized_gw":null,"announced_minus_energized_gw":null,"by_series":{"announced":null,"contracted":null,"under_construction":null,"energized":null}},"jsonLd":{"@context":"https://schema.org","@type":"Place","name":"DC4","url":"https://registry.deploy.report/datacenters/scaleway-dc4","address":{"@type":"PostalAddress","addressLocality":"Paris"}}}