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Data4 PAR01 — Marcoussis

Marcoussis / Nozay, France

Reviewed 27 Sept 202610 sources
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Project brief

Operating Marcoussis campus with separately evidenced expansion and occupied-building retrofit packages. Official environmental authorisation and phase-specific contractor/carrier evidence now supplement…

Read overview
Next check

Reconcile the historic connection description with the executed current agreement, energised phases and reinforcement commissioning.

Open the full check

Overview

Operating Marcoussis campus with separately evidenced expansion and occupied-building retrofit packages. Official environmental authorisation and phase-specific contractor/carrier evidence now supplement operator specifications; current import rights and phase completion still require reconciliation.

Developer / applicant
Data4
Owner
Not verified
Operator
Data4

Planning and delivery status

Existing campus described as serving customers in the May 2025 operator announcement.

Stage source: 16 May 2025

Project intelligence. This record does not establish that the land or facility is available to acquire.

POWER STUDY

Power

What the power evidence establishes

The site-specific connection scope has not been established for this record.

Power classDNo qualifying rung

No same-scope, dated import-MVA rung has document-seen or better verification. Nearby infrastructure, IT MW and marketing claims cannot upgrade the class.

The class describes published documentary evidence at its stated date. It does not prove current contractual rights, transferability or an energisation date.

Class describes evidence maturity. Public records do not prove current contractual rights, transferable capacity or an energisation date. This record has not received a complete power study review.

Read the rules and verification levels
01

Capacity ladder and evidence

Each rung is a separate MVA claim for its stated site or phase. A missing rung is unknown.

01

Applied

Unknown

Not established from the public records reviewed.

What applied mva is evidenced for the assessed site scope?
Event date
Unknown

Not established from the public records reviewed.

What is the effective date of the applied connection evidence?
Capacity boundary
Unknown

Not established from the public records reviewed.

Which buildings or phases does the applied connection evidence cover?
Verification
Unknown
02

Offered

Unknown

Not established from the public records reviewed.

What offered mva is evidenced for the assessed site scope?
Event date
Unknown

Not established from the public records reviewed.

What is the effective date of the offered connection evidence?
Capacity boundary
Unknown

Not established from the public records reviewed.

Which buildings or phases does the offered connection evidence cover?
Verification
Unknown
03

Accepted / contracted

Unknown

Not established from the public records reviewed.

What accepted or contracted mva is evidenced for the assessed site scope?
Event date
Unknown

Not established from the public records reviewed.

What is the effective date of the accepted connection evidence?
Capacity boundary
Unknown

Not established from the public records reviewed.

Which buildings or phases does the accepted connection evidence cover?
Verification
Unknown
04

Energised

Unknown

Not established from the public records reviewed.

What energised mva is evidenced for the assessed site scope?
Event date
Unknown

Not established from the public records reviewed.

What is the effective date of the energised connection evidence?
Capacity boundary
Unknown

Not established from the public records reviewed.

Which buildings or phases does the energised connection evidence cover?
Verification
Unknown
Connection point and load boundaries
Network operator
Unknown

Not established from the public records reviewed.

Which TSO or DSO is responsible for this demand connection?
Connection point
Unknown

Not established from the public records reviewed.

What is the operator-confirmed connection substation or circuit?
Voltage
Unknown

Not established from the public records reviewed.

What voltage level is specified for the demand connection?
Straight-line distance
Unknown

Not established from the public records reviewed.

What are the evidenced site and connection-point coordinates, and their calculated straight-line distance?
Published route length
Unknown

Not established from the public records reviewed.

What grid route length is published, and for which circuit?

IT load

Unknown

Not established from the public records reviewed.

What is the published IT load in MW?
Basis
Unknown

Not established from the public records reviewed.

On what electrical basis is the IT load in MW stated?
Site / phase boundary
Unknown

Not established from the public records reviewed.

Which phase or campus does the IT load in MW cover?

Facility load

Unknown

Not established from the public records reviewed.

What is the published facility load in MW?
Basis
Unknown

Not established from the public records reviewed.

On what electrical basis is the facility load in MW stated?
Site / phase boundary
Unknown

Not established from the public records reviewed.

Which phase or campus does the facility load in MW cover?

Import capacity

Unknown

Not established from the public records reviewed.

What is the published import capacity in MVA?
Basis
Unknown

Not established from the public records reviewed.

On what electrical basis is the import capacity in MVA stated?
Site / phase boundary
Unknown

Not established from the public records reviewed.

Which phase or campus does the import capacity in MVA cover?

These are different electrical quantities. No power factor, PUE or available import is assumed from an IT-load statement.

Connection agreement and conditions
Agreement type
Unknown

Not established from the public records reviewed.

What connection agreement type and current status are documented?
Phased capacity
Unknown

Not established from the public records reviewed.

Does the agreement impose phased import-capacity limits?
Flexibility obligations
Unknown

Not established from the public records reviewed.

What flexibility or curtailment obligations apply?
On-site generation obligations
Unknown

Not established from the public records reviewed.

What on-site generation obligations apply?
Securities posted
Unknown

Not established from the public records reviewed.

What securities are required, posted and still valid?
Longstop dates
Unknown

Not established from the public records reviewed.

What connection longstop or milestone dates apply?
02

Conflicts and scope comparisons

No conflicting pair is recorded. This does not establish that all public statements have been reconciled.

03

France grid context

Network publications frame the claim. They do not allocate capacity to this site.

No country context entries have been linked to this site. Applicable policy, capacity information and reinforcement dependencies need review.

04

Derived energisation window

Earliest plausible yearUnknown
Latest plausible yearUnknown

The observed inputs do not establish a bounded delivery range. Open bounds stay unknown.

Rule

Use only a same-scope, dated, document-verified capacity rung and an applicable duration to energisation published by the observed site operator. The named process operator and a named source publisher must match that operator. Earliest year is the maximum of stage date plus minimum duration and each evidenced readiness constraint. Latest year is the maximum of stage date plus maximum duration and each published upper constraint only when every required input is bounded. An offer-processing duration is excluded. A missing required input leaves the affected bound unknown; no padding or contractual delivery promise is inferred.

No observed inputs establish this result.

Dependencies driving the range

  • Connection-dependent reinforcement scope and completion dates: unknown.
  • Grid-works planning status and programme: unknown.
  • Applicable connection-policy conditions and programme: unknown.

What the earliest case requires

  • Connection-dependent reinforcement scope and completion dates introduces no later constraint than the earliest case; this remains unverified.
  • Grid-works planning status and programme introduces no later constraint than the earliest case; this remains unverified.
  • Applicable connection-policy conditions and programme introduces no later constraint than the earliest case; this remains unverified.

Missing inputs leave the range open

  • A dated, document-verified import-MVA rung for the assessed scope.
  • An applicable duration from the evidenced stage to energisation, published by and matched to the observed site operator, rather than an offer-processing target.
  • Connection-dependent reinforcement scope and completion dates
  • Grid-works planning status and programme
  • Applicable connection-policy conditions and programme
05

Indicative HV and connection capex

Unknown

Rule and scope

Sum each published complete scope quantity multiplied by the matching published benchmark minimum and maximum. Configuration, voltage, route type, unit, country applicability, currency and explicit price base year must match. No assumed route length, transformer count, exchange rate, inflation, fee uplift or partial index is inserted. The result is an indicative benchmark band, not an operator quotation or contractual connection charge.

No observed inputs establish this result.

Published connection works scope
Unknown

Not established from the public records reviewed.

What complete connection scope is published: bays, stations, voltage, circuits, route lengths and underground or overhead configuration?
Scope completeness
Unknown

Not established from the public records reviewed.

Is the published connection scope complete enough to match every component to a sourced benchmark?

Scope questions

  • Obtain a published complete connection scope with voltage, configuration and measured quantities.
  • Establish that every necessary connection-work component is included in the published scope.
  • Identify network and customer works, upstream reinforcement, land and wayleaves, taxes, fees, securities, contingency and the price base.
06

Alternatives and policy exposure

Behind-the-meter generation

Unknown

Not established from the public records reviewed.

What behind-the-meter generation is evidenced, and at what scope?
Planning / policy requirement
Unknown

Not established from the public records reviewed.

Does the applicable planning or connection policy require behind-the-meter generation?

Battery storage

Unknown

Not established from the public records reviewed.

What battery storage is evidenced, and at what scope?
Planning / policy requirement
Unknown

Not established from the public records reviewed.

Does the applicable planning or connection policy require battery storage?

Private wire

Unknown

Not established from the public records reviewed.

What a private wire is evidenced, and at what scope?
Planning / policy requirement
Unknown

Not established from the public records reviewed.

Does the applicable planning or connection policy require a private wire?

Gas

Unknown

Not established from the public records reviewed.

What gas supply or generation is evidenced, and at what scope?
Planning / policy requirement
Unknown

Not established from the public records reviewed.

Does the applicable planning or connection policy require gas supply or generation?

Connection claim against current policy

Unknown

Not established from the public records reviewed.

Does the published connection claim meet the policy applicable to its application date, location and agreement status?
07

Open questions for a Reality Check

Generated from unknown fields, missing derivation inputs and unresolved evidence. The questions identify the documents or specialist checks needed next.

60 questions to resolve
  1. Which TSO or DSO is responsible for this demand connection?

    Not established from the public records reviewed.

  2. What is the operator-confirmed connection substation or circuit?

    Not established from the public records reviewed.

  3. What voltage level is specified for the demand connection?

    Not established from the public records reviewed.

  4. What are the evidenced site and connection-point coordinates, and their calculated straight-line distance?

    Not established from the public records reviewed.

  5. What grid route length is published, and for which circuit?

    Not established from the public records reviewed.

  6. What applied mva is evidenced for the assessed site scope?

    Not established from the public records reviewed.

  7. What is the effective date of the applied connection evidence?

    Not established from the public records reviewed.

  8. Which buildings or phases does the applied connection evidence cover?

    Not established from the public records reviewed.

  9. What evidence level can be supported for capacityLadder.applied?

    Verification has not been established.

  10. What offered mva is evidenced for the assessed site scope?

    Not established from the public records reviewed.

  11. What is the effective date of the offered connection evidence?

    Not established from the public records reviewed.

  12. Which buildings or phases does the offered connection evidence cover?

    Not established from the public records reviewed.

  13. What evidence level can be supported for capacityLadder.offered?

    Verification has not been established.

  14. What accepted or contracted mva is evidenced for the assessed site scope?

    Not established from the public records reviewed.

  15. What is the effective date of the accepted connection evidence?

    Not established from the public records reviewed.

  16. Which buildings or phases does the accepted connection evidence cover?

    Not established from the public records reviewed.

  17. What evidence level can be supported for capacityLadder.accepted?

    Verification has not been established.

  18. What energised mva is evidenced for the assessed site scope?

    Not established from the public records reviewed.

  19. What is the effective date of the energised connection evidence?

    Not established from the public records reviewed.

  20. Which buildings or phases does the energised connection evidence cover?

    Not established from the public records reviewed.

  21. What evidence level can be supported for capacityLadder.energised?

    Verification has not been established.

  22. What connection agreement type and current status are documented?

    Not established from the public records reviewed.

  23. Does the agreement impose phased import-capacity limits?

    Not established from the public records reviewed.

  24. What flexibility or curtailment obligations apply?

    Not established from the public records reviewed.

  25. What on-site generation obligations apply?

    Not established from the public records reviewed.

  26. What securities are required, posted and still valid?

    Not established from the public records reviewed.

  27. What connection longstop or milestone dates apply?

    Not established from the public records reviewed.

  28. What is the published IT load in MW?

    Not established from the public records reviewed.

  29. On what electrical basis is the IT load in MW stated?

    Not established from the public records reviewed.

  30. Which phase or campus does the IT load in MW cover?

    Not established from the public records reviewed.

  31. What is the published facility load in MW?

    Not established from the public records reviewed.

  32. On what electrical basis is the facility load in MW stated?

    Not established from the public records reviewed.

  33. Which phase or campus does the facility load in MW cover?

    Not established from the public records reviewed.

  34. What is the published import capacity in MVA?

    Not established from the public records reviewed.

  35. On what electrical basis is the import capacity in MVA stated?

    Not established from the public records reviewed.

  36. Which phase or campus does the import capacity in MVA cover?

    Not established from the public records reviewed.

  37. What operator-published connection-to-energisation duration applies to this site and connection stage?

    An application-to-offer processing target is not an energisation duration.

  38. Which reinforcements does the connection depend on, and what dates are published?

    Not established from the public records reviewed.

  39. Which grid works require planning, and what is their current consent status and dated programme?

    Not established from the public records reviewed.

  40. Which connection-policy conditions apply, and when could they be satisfied?

    Not established from the public records reviewed.

  41. What complete connection scope is published: bays, stations, voltage, circuits, route lengths and underground or overhead configuration?

    Not established from the public records reviewed.

  42. Is the published connection scope complete enough to match every component to a sourced benchmark?

    Not established from the public records reviewed.

  43. What behind-the-meter generation is evidenced, and at what scope?

    Not established from the public records reviewed.

  44. Does the applicable planning or connection policy require behind-the-meter generation?

    Not established from the public records reviewed.

  45. What battery storage is evidenced, and at what scope?

    Not established from the public records reviewed.

  46. Does the applicable planning or connection policy require battery storage?

    Not established from the public records reviewed.

  47. What a private wire is evidenced, and at what scope?

    Not established from the public records reviewed.

  48. Does the applicable planning or connection policy require a private wire?

    Not established from the public records reviewed.

  49. What gas supply or generation is evidenced, and at what scope?

    Not established from the public records reviewed.

  50. Does the applicable planning or connection policy require gas supply or generation?

    Not established from the public records reviewed.

  51. Does the published connection claim meet the policy applicable to its application date, location and agreement status?

    Not established from the public records reviewed.

  52. Which checked country-grid sources and location-specific constraints apply to this connection?

    No country-context relationship has been established for this record.

  53. Identify network and customer works, upstream reinforcement, land and wayleaves, taxes, fees, securities, contingency and the price base.

    Connection-cost scope question.

  54. Resolve the energisation input: A dated, document-verified import-MVA rung for the assessed scope.

    This missing input leaves an energisation bound unknown.

  55. Resolve the energisation input: An applicable duration from the evidenced stage to energisation, published by and matched to the observed site operator, rather than an offer-processing target.

    This missing input leaves an energisation bound unknown.

  56. Resolve the energisation input: Connection-dependent reinforcement scope and completion dates

    This missing input leaves an energisation bound unknown.

  57. Resolve the energisation input: Grid-works planning status and programme

    This missing input leaves an energisation bound unknown.

  58. Resolve the energisation input: Applicable connection-policy conditions and programme

    This missing input leaves an energisation bound unknown.

  59. Obtain a published complete connection scope with voltage, configuration and measured quantities.

    This scope or reference gap prevents a complete indicative connection capex band.

  60. Establish that every necessary connection-work component is included in the published scope.

    This scope or reference gap prevents a complete indicative connection capex band.

Use these questions to scope a Power Reality Check.

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Earlier capacity notes and source context
250 MW unspecifiedProject capacity

Campus-specific electrical/power capacity on operator page; not confirmed commissioned IT load.

Published claimProject source record
Import rights and connection evidence

The 2023 MRAe opinion describes two 90 kV underground feeds from Villejust and a historical 100 MW supply claim, while requiring the proposed 225 kV reinforcement to enter the project assessment. The current operator publishes 250 MW at campus scope. These dated statements do not prove present import rights or spare capacity.

IT load, facility demand, import capacity and equipment ratings retain their stated scope. A published figure does not establish spare or transferable supply.

Planning & utilities

8 of 10 categories contain evidence. Each status applies to its specific claim.

Planning & decisions

Partial evidence

Géorisques identifies authorised operating establishment 0006522360 and lists an environmental authorisation dated 31 May 2024, following January 2024 advance-construction prescriptions. This verifies a regulatory record, not completion of every campus phase.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Read the full 2024 order, amendment history and 17 December 2025 inspection report; reconcile DC21/DC22/DC23 compliance and any appeals.

Grid & import rights

Partial evidence

The 2023 MRAe opinion describes two 90 kV underground feeds from Villejust and a historical 100 MW supply claim, while requiring the proposed 225 kV reinforcement to enter the project assessment. The current operator publishes 250 MW at campus scope. These dated statements do not prove present import rights or spare capacity.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Reconcile the historic connection description with the executed current agreement, energised phases and reinforcement commissioning.

Fibre & dark fibre

Partial evidence

Sipartech’s 10 September 2026 list identifies PAR1 buildings DC1–DC12, DC14 and DC17–DC24 as on-net. This is named building-level carrier evidence; no dark-fibre pairs, customer handoff or physically diverse ducts are verified. The broader operator claim of more than 70 carriers across its Paris campus does not allocate all carriers to this building.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Obtain exact delivery point, available products and independent route/duct evidence for the selected building.

Land, footprint & access

Partial evidence

DATA4 publishes a 110 hectares campus-specific area and a street address. This supports the operating footprint but is not title or cadastral evidence.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Confirm title entity, cadastral boundary and building-by-building occupied footprint.

Flood, ground & environment

Partial evidence

The 2023 MRAe review identified uncompleted ecological compensation from earlier clearance and requested a wetland diagnostic and stronger whole-campus impact assessment. Later authorisation is listed, but closure of those historic findings was not verified.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Read 2024 consent conditions and the 2025 inspection before treating the earlier compensation findings as resolved.

Water, cooling & heat

Partial evidence

Data4’s June 2025 release identifies a DC01 direct-liquid-cooling pilot with named CDU, equipment, load-bank and assessment partners. It describes a commissioning programme, not verified performance across every campus building.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Confirm commissioned DC01 configuration, test acceptance and metered cooling/water performance; retain pilot scope.

Demand & location fit

Partial evidence

The operator cites proximity to the Paris-Saclay technology cluster and offers dedicated-building capacity. No named customer or contracted demand is disclosed for this campus record.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Check current take-up and named expansion demand without treating the operator marketing statement as a commitment.

Programme & delivery

Partial evidence

The historic Zone 2 Nord dossier targeted completion by 2027. Cellpack’s DC23 reference instead describes a 2024–2026 package and planned 2026 completion. Neither forecast independently establishes handover.

Sources & next check
Evidence reviewed 27 Sept 2026

Next check

Seek phase-specific completion and energisation records; do not turn different package dates into a campus opening date.

Not assessed

Land-use zoningOwnership & development control
Evidence still needed
  • Land-use zoning

    The site boundary has not been matched to the current adopted zoning map and data-centre use policy.

  • Ownership & development control

    Legal title, land-owning entity, development-control route and restrictions need verification. A named developer does not establish availability.

Project team

Appointments are limited to the project, phase and scope supported by each source.

Architect

Engineering consultant

Gesys IngénierieOther projects

DC19 technical assistance, commissioning and execution management for technical trades; consultant records completion in January/March 2023.

Appointment source

Specialists & vendors

Generale PrefabbricatiOther projects

Design and construction of precast structures for DC21/DC23. The partner French construction group is unnamed; no campus-wide GC role inferred.

Appointment source
BBC CellpackOther projects

DC23 medium- and low-voltage connection products, certification and installer training through Equans, with 2024–2026 project period.

Appointment source
Schneider ElectricOther projects

DC01 retrofit direct-liquid-cooling design collaboration; source does not establish a campus-wide electrical contract.

Appointment source

Unlisted roles have no project-specific appointment recorded.

Sources

Publication dates are shown where known. Review dates do not establish approval or commissioning.

  1. Data4 Paris campus specificationsdata4group.com · Publication date unstated
  2. Data4 unveils PAR03 campus plansdata4group.com · 16 May 2025
  3. Géorisques: DATA 4 SERVICE establishment 0006522360 and authorisation registergeorisques.gouv.fr · Publication date unstated
  4. MRAe APJIF-2023-041: Marcoussis Zone 2 Nord environmental opinionmrae.developpement-durable.gouv.fr · 9 Aug 2023
  5. Sipartech: on-net locations, update 10 September 2026sipartech.com · 10 Sept 2026
  6. Generale Prefabbricati: Data4 DC21/DC23 precast structuresgeneraleprefabbricatispa.com · Publication date unstated
  7. Gesys: DC19 technical assistance, commissioning and architectgesys-ing.com · Publication date unstated
  8. BBC Cellpack: DC23 medium/low-voltage products through Equanscellpack.com · Publication date unstated
  9. Data4: DC01 direct-liquid-cooling implementation and named partnersdata4group.com · 2 Jun 2025
  10. Data4: occupied DC01 retrofit and further PAR02 intentiondata4group.com · 3 Feb 2025

Original documents and maps retain their rights. Public access does not grant commercial redistribution rights.