Pillar sub-scores
A pillar mixes what is endured and what is chosen; a grade is not the average of the pillars. Energy ●●●●
EnergyD
Missing: PUE (announced energy efficiency), Waste-heat recovery — commitment.
Water ●●●○
WaterD
Missing: Basin withdrawal pressure, Cooling technology + announced water volume.
Land & biodiversity ●●●○
Land & biodiversityB
Missing: Ecological corridors (TVB), Avoid-reduce-offset (ERC) measures, Designated for urbanisation in a supra-municipal plan, Planning-document compatibility procedure under way.
Local impact ●●○○
Local impactE
Missing: Announced jobs, Announced tax revenue, Observed level of opposition, Elected officials' position (voted facts only).
Transparency & governance
Transparency & governance–
“Rated D on site, but E on “Local impact”.”
This site is among the 80% of the fleet connected to an already-saturated substation. Fleet figures →
This site is in France — the country's site index: C (55.9). See the country index →
What the environmental case file states
2021-08-18 · 24 pages · read the opinion (PDF)
Energy and heat
Announced PUE1.6p.20
Actuellement, cet indice « PUE » est estimé à 1,6.
Waste heat recoveryunder_studyp.20
Le maître d’ouvrage réalise une analyse concise et précise de la potentielle valorisation de cette chaleur fatale par le raccordement au réseau de chaleur exploité par la société Dalkia, au cours de la 6ème année de fonctionnement du data-center.
Water and cooling
Refrigerant (designation)9 values
R410Ap.2expliquer les causes des fuites observées en 2017 et 2018, les mesures prises pour prévenir ce type d’incident et les raisons du choix du fluide frigorigène R410A pour les pompes à chaleur compte tenu de sa propriété d’être un gaz à effet de serre puissant ;
R134A · R410 · R32 · R125p.74 Le R134A est un gaz de type HFC (hydrofluorocarbone) constitué de tétrafluoroéthane et le gaz R410 est un fluide frigorifique composé de 50 % de gaz R32 (difluorométhane) et de 50 % de gaz R125 (pentafluoroéthane).
R134a · R410a · R1234zep.15les gaz d’échappement des véhicules / les fuites de gaz R134a, de fluide frigorifique R410a et de fluide R1234ze contenus dans les différents équipements de type groupes froids et des pompes à chaleur.
R1234ap.224 kg de fluide frigorifique R410a et 24 kg de gaz R1234a 38 (p. 136).
Generators and fuel
Backup generators (count)9 groupesp.7
de 9 groupes électrogènes de puissance totale évaluée à 53,1 MW (dont des équipements représentant une puissance de 13 MW fonctionnent en redondance 3) utilisant du fioul domestique.
Backup generator fueldomestic_fuel_oilp.7
de 9 groupes électrogènes de puissance totale évaluée à 53,1 MW (dont des équipements représentant une puissance de 13 MW fonctionnent en redondance 3) utilisant du fioul domestique.
Fuel tanks (count)3 values
5 cuvesp.7de 5 cuves enterrées double enveloppe permettant le stockage de 268 tonnes de fioul domestique.
8 cuvesp.7de 8 cuves aériennes permettant le stockage de 3,4 tonnes de fioul domestique.
3 cuvesp.8de trois cuves enterrées supplémentaires double enveloppe, de volume unitaire égal à 100 m3, permettant le stockage de fioul domestique et de six nourrices journalières 8 (cuves d’un volume de 0,5 m3) permettant d’alimenter les groupes électrogènes.
Neighbourhood
Distance to nearest dwellings500 mp.22
Les risques technologiques D’après l’étude de dangers correspondant à la pièce jointe n°49 du dossier de demande d’autorisation environnementale, les habitations les plus proches sont situées à une distance de 500 m au nord-est du site.
Footprint and buildings
Plot area7.4 hap.5
Le site accueillant le projet d’extension prend place sur les trois parcelles cadastrales n°0544, n°0554 et n°0557, section OB, représentant une surface d’environ 7,4 ha.
Building footprint5,300 m²p.9
le courrier en date du 9 décembre 2020, concernant l’absence de nécessité d’une procédure de dérogation à la protection des espèces pour le projet MAE2, mentionne une emprise au sol du projet évaluée à 5 300 m2.
Gross floor area10,891 m²p.8
Il développe une surface de plancher de 10 891 m2 et une surface au sol de 6 008 m2.
ICPE classificationICPE — the French regime that authorises, frames and inspects an activity liable to create a risk or a nuisance. Each number designates the activity concerned in the national nomenclature. Being classified does not mean being dangerous: it means being regulated, and therefore inspected.
- 2910Combustion — plants below that threshold
- 1185Fluorinated greenhouse gases (cooling refrigerants)
- 2925Battery charging areas (backup batteries)
- 4734Storage of petroleum products (the generators' fuel)
- 3110Combustion — plants with a total thermal input ≥ 50 MW (IED directive)
Tracked indicators
| Indicator | Value | Reading | State | Source |
|---|---|---|---|---|
| Energy | ||||
| Local grid carbon intensity How much CO₂ is emitted to produce the electricity the site will consume, based on the regional grid. The lower the value, the better. | 17.6 gCO2e/kWh | Measured | RTE eCO2mix (données définitives) — France national CO2 intensity, 12-month mean 2025-07-30..2026-04-30 (17.6 gCO2/kWh, n=13196 half-hourly) — accessed 2026-07-30 | |
| Grid connection capacity / proximity How easily the site can be connected to the power grid: available capacity and distance to the nearest substation. | grid saturated at the connection point | Measured | Caparéseau (RTE S3REnR) — poste ORSONVILLE at 1.8 km: 0.0 MW available hosting capacity (updated 13/06/2026) — accessed 2026-07-14 | |
| Grid congestion / connection queue How congested the local grid is: the more saturated, the more the connection competes with other users. | critical local grid congestion | Measured | Caparéseau (RTE S3REnR) — poste ORSONVILLE at 1.8 km: 100.0% reserved-capacity fill rate (updated 13/06/2026) — accessed 2026-07-14 | |
| PUE (announced energy efficiency) The announced energy efficiency: total electricity used versus what actually powers computing. Closer to 1 is better. The lower the value, the better. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Heat-network connectability Whether the site can valorise its waste heat via a district-heating network: distance to the nearest network and presence of a connection obligation (priority development perimeter). | connectable to an existing heat network | Measured | France Chaleur Urbaine (data.gouv, lov2) — réseau de chaleur le plus proche : 8 m (point→segment, Lambert 93) ; dans un PDP : non ; réseau classé : non → raccordable (≤300 m) — accessed 2026-09-30 | |
| Waste-heat recovery — commitment Operator commitment level to valorise the site's waste heat (delivered / signed contract / study / intention / none). | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Water | ||||
| Local water stress Water tension in the area: in an already water-scarce region, withdrawals weigh more heavily. | moderate water stress | Measured | VigiEau — drought-restriction status at point (accessed 2026-07-14) — accessed 2026-07-14 | |
| Water body status The ecological health of the affected river or aquifer, per the EU classification (from 'high' to 'bad'). | water body in bad status | Measured | EEA WISE (WFD 2022) — water body FRHR150-F6586000 'ru de lochy': ecological status class 5/5 — accessed 2026-07-14 | |
| Basin withdrawal pressure How intensively water is already withdrawn from the basin: a heavily-tapped basin ill affords a new user. | Not disclosed | — | Absent from the file We read the public file and the information is not in it. It counts as a zero in the grade. | — |
| Cooling technology + announced water volume The cooling technology chosen and the water volume it will consume, as announced by the operator. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Land & biodiversity | ||||
| Overlap / distance to protected areas How close the project is to protected natural areas (Natura 2000, nature reserves…). | protected natural area 1–5 km away | Measured | INPN / IGN API Carto — Natura 2000 & ZNIEFF overlap by distance ring — accessed 2026-07-14 | |
| Soil status (artificialized / natural / agricultural) What the land was before: already built (brownfield), natural, or farmland — sealing farmland or nature weighs most. | previously developed land | Measured | IGN API Carto GPU — PLU zoning 'UXm' — accessed 2026-07-14 | |
| Ecological corridors (TVB) Whether the project severs a wildlife corridor (green-and-blue network). | Not disclosed | — | Absent from the file We read the public file and the information is not in it. It counts as a zero in the grade. | — |
| Site ground footprint The SITE's ground footprint in hectares — the land the project takes up (buildings, roads, parking, substation, retention basins), not the building print alone: the larger, the greater the land impact. The lower the value, the better. | 7.4 hectares | Announced | Avis AE Île-de-France n°2021-006443 du 18/08/2021 (extension data center, Bailly-Romainvilliers 77) : « Le site accueillant le projet d'extension prend place sur les trois parcelles cadastrales n°0544, n°0554 et n°0557, section OB, représentant une surface d'environ 7,4 ha. » — accessed 2026-10-26 | |
| Avoid-reduce-offset (ERC) measures Measures to avoid, reduce or offset harm to soil artificialisation and biodiversity. (Heat recovery moved to E6/E7, Energy pillar.) | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Designated for urbanisation in a supra-municipal plan not scored · contextual fact Is the site designated for urbanisation in a planning document above the municipality? A contextual fact, published as such: it neither improves nor worsens the grade. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Planning-document compatibility procedure under way not scored · contextual fact Is a procedure under way to make the planning document compatible with the project? A contextual fact: we follow the instrument, not the intention — the land status only changes the day the procedure completes. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Local impact | ||||
| Municipality socio-economic profile The host town's social profile. A safeguard: a project must never improve its grade by locating in a vulnerable town. | municipality's social profile: favourable | Measured | INSEE Filosofi (via data.gouv) — commune 77018: median disposable income 26990 €/consumption unit — accessed 2026-07-14 | |
| Absorption capacity (project size vs municipality) The project's size relative to the town: a very large project in a small town disrupts more. The lower the value, the better. | 12.894 MW per 1000 inhabitants | Announced | INSEE populations légales via geo.api.gouv.fr — Bailly-Romainvilliers (6980 hab.) ; puissance 90.0 MW (DCWatch ODbL, export 7dd5b5e9). Ratio MW/1000 hab, calcul déterministe · vérification primaire tentée 2026-07-19 (opérateur/permis/presse) : aucune valeur mieux sourcée trouvée — accessed 2026-07-14 | |
| Technological hazard / nearby Seveso sites The presence of hazardous industrial sites (Seveso) nearby, adding risk to the surroundings. | an upper-tier Seveso establishment on record within 2 km | Measured | Géorisques — registre des installations classées (statut Seveso) : établissement Seveso le plus proche à 1.6 km. Bandes ≤2km=high / ≤5km=low. — accessed 2026-10-06 | |
| Announced jobs The number of permanent jobs announced, relative to project size. More is better. The higher the value, the better. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Announced tax revenue The tax revenue the project would bring to the town, as announced. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Observed level of opposition The scale of observed opposition: appeals, petitions, mobilizations reported by the press. | Not disclosed | — | Absent from the file We read the public file and the information is not in it. It counts as a zero in the grade. | — |
| Elected officials' position (voted facts only) Elected officials' position as expressed by official votes only (council decisions), with no personal judgment. | Not disclosed | — | Absent from the file We read the public file and the information is not in it. It counts as a zero in the grade. | — |
| Transparency & governance | ||||
| Consultation / consent / governance (procedural proxies) The quality of the democratic process: public inquiry held, environmental authority opinion, appeals, CNDP referral. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
| Documentation transparency / file availability How genuinely accessible the project's file is to the public: published studies, figures and commitments. | — | — | Not looked for yet We have not looked for this yet. It is dropped from the calculation and does not penalise the site. | — |
Operator response
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State of the available data
26 indicators tracked · 10 measured · 2 announced (unverified) · 4 absent from the file · 10 not looked for yet.
Grade history
Methodology 0.3.0 scoremydatacenter.org