Campus with an effective data-centre zoning plan and substation/cable works underway. Published 200 MW contracted-connection claim and 200 MVA substation rating are retained separately; IT design range remains…
Read overviewmaincubes BER02 / mainHub — Nauen campus
Nauen, Berlin region, Germany
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7 cited sources · 9 utility and planning categories reviewed.
Review evidence and gapsConfirm contract rating, phases, reinforcement milestones and actual energisation with network evidence.
Open the full checkOverview
Campus with an effective data-centre zoning plan and substation/cable works underway. Published 200 MW contracted-connection claim and 200 MVA substation rating are retained separately; IT design range remains 144–186 MW.
- Developer / applicant
- maincubes
- Owner
- maincubes (announced land acquirer; legal title-holding entity unverified)
- Operator
- maincubes
Planning and delivery status
The 24 March 2026 announcement confirms permitted substation/cable works commencing, providing a dated basis for the campus construction label. The operator targets BER02 service in Q3 2028; completion of data halls is not established.
Stage source: 24 Mar 2026Project 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 levels01
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?02
Offered
Unknown
Not established from the public records reviewed.
What offered mva is evidenced for the assessed site scope?03
Accepted / contracted
Unknown
Not established from the public records reviewed.
What accepted or contracted mva is evidenced for the assessed site scope?04
Energised
Unknown
Not established from the public records reviewed.
What energised mva is evidenced for the assessed site scope?02
Conflicts and scope comparisons
No conflicting pair is recorded. This does not establish that all public statements have been reconciled.
03
Germany 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.
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
- Which TSO or DSO is responsible for this demand connection?
Not established from the public records reviewed.
- What is the operator-confirmed connection substation or circuit?
Not established from the public records reviewed.
- What voltage level is specified for the demand connection?
Not established from the public records reviewed.
- What are the evidenced site and connection-point coordinates, and their calculated straight-line distance?
Not established from the public records reviewed.
- What grid route length is published, and for which circuit?
Not established from the public records reviewed.
- What applied mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the applied connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the applied connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.applied?
Verification has not been established.
- What offered mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the offered connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the offered connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.offered?
Verification has not been established.
- What accepted or contracted mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the accepted connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the accepted connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.accepted?
Verification has not been established.
- What energised mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the energised connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the energised connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.energised?
Verification has not been established.
- What connection agreement type and current status are documented?
Not established from the public records reviewed.
- Does the agreement impose phased import-capacity limits?
Not established from the public records reviewed.
- What flexibility or curtailment obligations apply?
Not established from the public records reviewed.
- What on-site generation obligations apply?
Not established from the public records reviewed.
- What securities are required, posted and still valid?
Not established from the public records reviewed.
- What connection longstop or milestone dates apply?
Not established from the public records reviewed.
- What is the published IT load in MW?
Not established from the public records reviewed.
- On what electrical basis is the IT load in MW stated?
Not established from the public records reviewed.
- Which phase or campus does the IT load in MW cover?
Not established from the public records reviewed.
- What is the published facility load in MW?
Not established from the public records reviewed.
- On what electrical basis is the facility load in MW stated?
Not established from the public records reviewed.
- Which phase or campus does the facility load in MW cover?
Not established from the public records reviewed.
- What is the published import capacity in MVA?
Not established from the public records reviewed.
- On what electrical basis is the import capacity in MVA stated?
Not established from the public records reviewed.
- Which phase or campus does the import capacity in MVA cover?
Not established from the public records reviewed.
- 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.
- Which reinforcements does the connection depend on, and what dates are published?
Not established from the public records reviewed.
- Which grid works require planning, and what is their current consent status and dated programme?
Not established from the public records reviewed.
- Which connection-policy conditions apply, and when could they be satisfied?
Not established from the public records reviewed.
- What complete connection scope is published: bays, stations, voltage, circuits, route lengths and underground or overhead configuration?
Not established from the public records reviewed.
- Is the published connection scope complete enough to match every component to a sourced benchmark?
Not established from the public records reviewed.
- What behind-the-meter generation is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require behind-the-meter generation?
Not established from the public records reviewed.
- What battery storage is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require battery storage?
Not established from the public records reviewed.
- What a private wire is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require a private wire?
Not established from the public records reviewed.
- What gas supply or generation is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require gas supply or generation?
Not established from the public records reviewed.
- Does the published connection claim meet the policy applicable to its application date, location and agreement status?
Not established from the public records reviewed.
- Which checked country-grid sources and location-specific constraints apply to this connection?
No country-context relationship has been established for this record.
- Identify network and customer works, upstream reinforcement, land and wayleaves, taxes, fees, securities, contingency and the price base.
Connection-cost scope question.
- Resolve the energisation input: A dated, document-verified import-MVA rung for the assessed scope.
This missing input leaves an energisation bound unknown.
- 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.
- Resolve the energisation input: Connection-dependent reinforcement scope and completion dates
This missing input leaves an energisation bound unknown.
- Resolve the energisation input: Grid-works planning status and programme
This missing input leaves an energisation bound unknown.
- Resolve the energisation input: Applicable connection-policy conditions and programme
This missing input leaves an energisation bound unknown.
- Obtain a published complete connection scope with voltage, configuration and measured quantities.
This scope or reference gap prevents a complete indicative connection capex band.
- 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.
Request an assessment of this record and the evidence needed next. Share only public information or documents you are authorised to provide.
Request a Reality CheckEarlier capacity notes and source context
200 MVADedicated substation rating
Campus substation; not converted into MW or treated as available IT load.
Published claimCapacity source200 MW importAnnounced contracted grid connection
Operator’s August 2025 signed E.DIS connection announcement; supply targeted from 2027. Separate from published 200 MVA substation/design figure; no conversion or energisation assumption.
Published claimCapacity sourceImport rights and connection evidence
maincubes reports a signed 200 MW E.DIS connection contract with supply from 2027. The plan and current specification separately use 200 MVA; the differing measures must be reconciled, not converted.
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
9 of 10 categories contain evidence. Each status applies to its specific claim.
Planning & decisions
DocumentedCity gazette confirms plan adoption on 25 February 2025 and entry into force on 2 July 2025. March 2026 announcement confirms substation/cable permission; full data-hall permits remain unreviewed.
Sources & next check
Land-use zoning
DocumentedEffective Rechenzentrum plan establishes a special data-centre-use area under §11 BauNVO. Its planning report is dated 6 December 2024; that version date is not its legal commencement date.
Sources & next check
Grid & import rights
Partial evidencemaincubes reports a signed 200 MW E.DIS connection contract with supply from 2027. The plan and current specification separately use 200 MVA; the differing measures must be reconciled, not converted.
Sources & next check
Fibre & dark fibre
Partial evidenceCurrent design specifies four carrier entry points at campus/building level. No named live carrier routes or contracted dark-fibre service is established.
Sources & next check
Ownership & development control
Partial evidencemaincubes announced land acquisition in October 2024. The municipal report identifies AM:PM Grund Alpha as developer and separates private parcels from city/federal road parcels.
Sources & next check
Land, footprint & access
Partial evidenceThe 14.6 ha adopted planning area includes Flur 17 parcels 35, 36, 157, 159, 209–212 and parts of 46/7, 232, 233; proposed splits of 35/36/210 were still awaiting registration in the report. This differs from the operator’s approximately 137,000 m² plot. Existing B273 access agreements remain relevant; the report also requires relocation of an NBB high-pressure gas line.
Sources & next check
Flood, ground & environment
Partial evidenceEnvironmental report calls for October–February clearance, ecological construction supervision and reptile protection fencing. It reports no relevant ground contamination indications; implementation and required species approvals need verification.
Sources & next check
Water, cooling & heat
Partial evidenceOperator offers air, liquid and hybrid options and now claims zero process-water use. The adopted report instead describes stored/rainwater-assisted cooling above about 28°C, with quantities deferred to building permission. It records WAH planning agreement, but no existing site water/sewer laterals. Reserved heat-infrastructure land and heat availability remain distinct from a commissioned heat network.
Sources & next check
Programme & delivery
DocumentedMarch 2026 announcement starts the permitted 110 kV substation and roughly 6 km cable route, naming JSM. BER02’s Q3 2028 service date remains an operator target.
Sources & next check
Not assessed
Demand & location fit
Evidence still needed
- Demand & location fit
Customer geography, latency, cloud or exchange nodes and a supported use case need project-specific evidence; national growth alone is insufficient.
Project team
Appointments are limited to the project, phase and scope supported by each source.
Main contractor
JSM GroupOther projects
General contractor supporting Nauen substation and cable-trace works in the March 2026 infrastructure-start announcement; data-hall GC scope is not established.
Appointment sourceSpecialists & vendors
AM:PM Grund Alpha GmbHOther projects
Project developer for the 14.6 ha Nauen planning area, explicitly identified in the municipal adopted-version plan report.
Appointment sourceUnlisted roles have no project-specific appointment recorded.
Sources
Publication dates are shown where known. Review dates do not establish approval or commissioning.
- maincubes BER02 — mainHub campus specificationmaincubes.com · Publication date unstated
- maincubes completes land purchase in Nauenmaincubes.com · 21 Oct 2024
- City of Nauen — Rechenzentrum zoning plan enters into forcenauen.de · 2 Jul 2025
- City of Nauen — adopted-version planning justification and environmental reportnauen.de · 6 Dec 2024
- City of Nauen — urban-development/access agreements and plan adoptionnauen.de · 17 Mar 2025
- maincubes — signed E.DIS connection contract and planning milestonemaincubes.com · 4 Aug 2025
- Ost Havelland municipal association — maincubes substation/cable start announcement of 24 March 2026osthavelland.com · 25 Mar 2026
Original documents and maps retain their rights. Public access does not grant commercial redistribution rights.