Setting up in Val-d'Oise
Data centres and the digital industry in Val-d'Oise
What a data centre or digital business project looks at when choosing a site — power, fibre, land, cooling, permits, skills — and what official sources publish for Val-d'Oise.
Diese Seite ist auf Englisch verfasst.
Project criteria and what is published
Power: substations and grid connection
Connecting a high-power consumer is handled by RTE (transmission grid) or Enedis (distribution grid), depending on the power requested. The capacity available at a given point for a new consumer is not published: it is obtained by applying to the operator.
40 substations published for Val-d'Oise, of which RTE substations : 40.
Installed generation and storage capacity (register) : 138.5 MW (31/07/2026, calculated value).
Electricity consumption — industry : 485,533 MWh (2024, calculated value).
Electricity consumption — services : 2,341,846 MWh (2024, calculated value).
RTE substations and tapping points : 40 sites (16/06/2026).
- Connecting a building, equipment or development project (Enedis) (Enedis)
- Location of pooling areas and hosting capacities for consumption (RTE) (RTE)
Digital and energy infrastructure
Fibre and interconnection
Fibre coverage is published town by town; internet exchange points or dark fibre networks are only mentioned where an official source publishes them.
Premises (homes and business premises), Arcep best estimate : 648,240 locaux (Q2 2026).
Premises connectable to fibre to the home (FTTH) : 636,404 locaux (Q2 2026).
Share of premises connectable to FTTH : 98.2% (Q2 2026, calculated value).
FTTH-connectable premises, Q1 2025 (Arcep series) : 620,237 locaux (Q1 2025).
Premises eligible for an FTTH offer (Ma connexion internet address base) : 623,335 locaux (30/06/2026).
Premises eligible for a satellite internet offer : 638,261 locaux (30/06/2026).
- Département's public-initiative network : Public-initiative network: Val d'Oise Fibre (OI code VOFI), FTTH infrastructure operator whose project owner is Val d'Oise Numérique; coverage area: département 95; parent listed: Lumière. Debitex Telecom (DETE, Altice France group) is also listed for Val d'Oise Numérique (93, 95). In Q2 2026 Val d'Oise Fibre is the sole FTTH infrastructure operator in 110 municipalities, all classified as public-initiative zone in Arcep's municipality layer. It is present, alone or with other operators, in 116 municipalities (column oi_ftth in communes.csv).
- Satellite internet : Ma connexion internet (Arcep), as of 30/06/2026: 638,261 of 638,261 recorded premises in Val-d'Oise are eligible for a satellite internet offer.
Land
Business land plots of one hectare or more listed on the Val-d'Oise property exchange are sorted by size, with the update date of each listing.
Large sites of one hectare or more Business parks Setting-up costs
Cooling: chillers and water
Data centres are cooled by chillers, water or a district cooling network. The district cooling networks published for Val-d'Oise are listed below; official texts on air conditioning and refrigerants are listed with their links.
- Réseau froid ADP Roissy — Roissy-en-France (Aéroports de Paris)
Heat recovery
Heat produced by a data centre can feed a district heating network. Only projects established by an official source are mentioned here.
Classified installations and permits
A data centre's back-up generators and fuel storage may fall under the French classified installations (ICPE) nomenclature (headings 2910 “combustion” and 4734 “petroleum products”). Authorisations issued can be consulted on Géorisques; the steps of a major project are described on a dedicated page.
Géorisques · Steps of a major project · Administrative procedures
Data centres established by an official source
There is no comprehensive public register of data centres. A data centre is only mentioned here if an official source (classified installation record, prefectoral order or a government or local authority announcement) names and locates it.
OP CORE site DC5
- Status
- En exploitation avec titre (Géorisques, fiche mise à jour le 29/06/2026)
- Operator
- OP CORE (arrêté de 2023 délivré à la société SCALEWAY)
- Town
- Saint-Ouen-l'Aumône
- Address
- 25 avenue de l'Eguillette, 95310 Saint-Ouen-l'Aumône (Géorisques) ; 27 avenue de l'Eguillette, ZI du Vert Galant (arrêté IC-23-117)
- Classified installation
- 2910 A.1 : combustion, 48,6 MW, enregistrement, 1185 2.a : 681,1 kg, déclaration avec contrôle, 2925 2 : charge d'accumulateurs, 658,11 kW, déclaration · Enregistrement · Géorisques
What the source establishes : Exploitant OP CORE, nom du site « DC5 », adresse, coordonnées, régime, rubriques, état « en exploitation avec titre », NAF 63. Le SIRET publié est celui du siège parisien (14 rue du Printemps, 75017), pas celui du site. — Géorisques, 2026-10-03
What the source establishes : L'arrêté IC-23-117 du 20/10/2023 enregistre « l'installation de combustion, attenante à un centre de stockage de données (data-center) » de la société SCALEWAY au 27 avenue de l'Eguillette. Texte lu par reconnaissance de caractères (document scanné). — Préfecture du Val-d'Oise (arrêté publié sur Géorisques), 2026-10-03
Equinix PA12x (Equinix Hyperscale 2)
- Status
- Projet en construction ; « pas encore opérationnel » selon l'avis de la MRAe du 23/04/2025. Absent de la base Géorisques au 03/10/2026.
- Operator
- Equinix Hyperscale 2
- Town
- Argenteuil
- Address
- 1-3 rue Charles Michels, zone industrielle du Val d'Argent, Argenteuil
- Classified installation
- 3110 : combustion, 140,5 MWth, autorisation (avis d'enquête publique) · Autorisation (demande)
What the source establishes : Enquête publique unique (arrêté IC-22-033 du 19/05/2022, du 20/06 au 21/07/2022) sur la construction et l'exploitation d'un centre de données de la société EQUINIX HYPERSCALE 2 (PA12) à Argenteuil, rubrique 3110 (140,5 MWth). — Préfecture du Val-d'Oise, 2026-10-03
What the source establishes : Adresse 1-3 rue Charles Michels, ZI du Val d'Argent ; site de 17 116 m² ; consommation annuelle prévue de 318 886 MWh. — MRAe Île-de-France, 2026-10-03
What the source establishes : En avril 2025, la construction de PA12x n'était pas achevée et le centre n'était « pas encore opérationnel ». — MRAe Île-de-France, 2026-10-03
Equinix PA16
- Status
- Projet : avis de la MRAe du 23/04/2025 ; le dossier prévoit une mise en service fin 2029. Décision préfectorale non vérifiée.
- Operator
- Equinix France SAS
- Town
- Argenteuil
- Address
- 5 rue Charles Michels, zone industrielle du Val d'Argent, Argenteuil
- Classified installation
- combustion 142,2 MWth, régime d'autorisation, 2925-2 : batteries lithium-ion, 32,4 MW, déclaration · Autorisation (demande)
What the source establishes : Projet de datacenter PA16 porté par Equinix France SAS au 5 rue Charles Michels ; emprise de 17 622 m² ; puissance de raccordement d'environ 55 MW ; mise en service prévue fin 2029. — MRAe Île-de-France, 2026-10-03
There is no official exhaustive register of data centres. This list only uses official sources that name and locate a data centre: Géorisques records (1,363 classified installations in Val-d'Oise read on 03/10/2026), prefectural orders and inquiry notices, and environmental authority (MRAe) opinions. The search was stopped on instruction before it was exhaustive.
Digital ecosystem
Digital and energy companies
The Val-d'Oise business directory (INSEE SIRENE register) sorts companies by sector.
Digital sector companies Energy and environment sector companies
Public laboratories in digital technologies and applied mathematics
Active research units located in Val-d'Oise (French national directory of research structures), grouped by CEEVO under “digital, electronics, embedded systems” and “applied mathematics, modelling, data”.
- AGM — Analyse, géométrie et modélisation (AGM) (Pontoise)
- ETIS — Equipes Traitement de l'Information et Systèmes (Cergy)
- IDHN — Institut des Humanités numériques (Cergy)
- INTEGR'IT — Laboratoire Integr'IT (Pontoise)
- LÉA — Laboratoire d'Électronique et d'Automatique (Cergy)
- LT2D — Lexiques, Textes, Discours, Dictionnaires : Centre Jean Pruvost - EA 7518 (Cergy)
Institutions offering digital programmes
Higher education institutions in Val-d'Oise for which Onisep lists programmes in computing or electronics.
- CY Cergy Paris Université
- École supérieure des sciences économiques et commerciales
- École nationale supérieure de l'électronique et de ses applications de Cergy
- ECAM-EPMI
- ESIEE-IT
Employment
9,049 salaried jobs in information and communication (publishing, telecoms, IT, information services), out of 428,504 in Val-d'Oise at 31/12/2024 (INSEE, Flores).
4,592 salaried jobs in mining, energy, water and waste management, out of 428,504 in Val-d'Oise at 31/12/2024 (INSEE, Flores).
What is not published as open data
This information does not exist as open data at the date of update. It must be requested from the relevant operator; CEEVO can help direct the request.
- 4G and 5G coverage by town and operator : Arcep publishes coverage maps, but no coverage rate by town and operator as open data. This page therefore gives the number of 4G and 5G sites per town; the share of the département's land area covered by 4G is INSEE's figure, based on Arcep data.
- Available capacity for a consumer (withdrawal) per substation : Not published as open data for the Val-d'Oise. Caparéseau and the Enedis/RTE map cover GENERATION only (the RTE page says the map does not cover storage or consumption). For consumption, RTE only publishes pooling areas (none in the Val-d'Oise at 31/07/2026).
- Caparéseau hosting capacities (S3REnR) as a file : Viewable on the Caparéseau interactive map (generation); no downloadable dataset found on ODRÉ or data.gouv.fr; not included.
- Coordinates and municipality of RTE substations : Not published: RTE states it changed access to GPS data of transmission infrastructure for public security reasons.
- Enedis primary substations with coordinates : No primary-substation dataset found in the Enedis open data catalogue (03/10/2026); only HTA/LV substations are published. The generation register cites substation codes (same as RTE codes) without name or coordinates.
- Confidential municipal consumption cells : At municipal level some cells are withheld (commercially sensitive / personal data); flagged in conso_secret and excluded from totals.
Have a project?
CEEVO puts project developers in touch with grid operators, local authorities and government services. Enquiries are confidential.