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Cartis diligence evidence schedule

maincubes mainHub Berlin Campus / BER02

PRJ-1307 · Site · Nauen, Brandenburg, Germany

Record last updated Oct 29, 2026

Scope and capacity

maincubes is developing mainHub Berlin in Nauen, with BER02 as the first building of a campus designed for 144–186 MW of IT capacity. Its reported 200 MW E.DIS connection agreement is separate from the 200 MVA substation rating; energization is unverified. The detailed operator page targets Q3 2028 service, while portfolio wording also retains Q1 2028. Zoning is effective, not blanket building approval. Supplementary water cooling in the December 2024 planning rationale remains unreconciled with the operator’s zero-process-water design claim; neither establishes zero total water consumption.

Headline: 186 MW Planned critical IT

Numbers refer to their stated physical boundaries and are not added together. Source dates, claim dates and record updates have different meanings. Missing dates and locators are not inferred.

Claims and exhibit sources

Jump to a claim (16)

Target IT capacity MW · 186 MW

Planned / design or future potential · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162089 · Recorded claim type: Forecast · Review: Approved · Claim date: Not stated

Headline treatment: Selected headline

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Site location · Berliner Straße, 14641 Nauen; 52.5935000,12.8929999; approximately 137000 sqm. BER02 is the first building of one up to six building campus.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162090 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Land and site control context · Operator plot area and coordinates confirmed.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162091 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Lower design IT capacity MW · 144 MW

Design · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162092 · Recorded claim type: Design · Review: Approved · Claim date: Not stated

Headline treatment: Separate claim, not added to the headline

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Process water design context · Operator describes zero process water usage as a campus design feature; total water use, water sourcing, domestic/fire/construction consumption and measured WUE are not established.

Forecast · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162472 · Recorded claim type: Forecast · Review: Approved · Claim date: Not stated

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Heat reuse design context · Campus design includes heat recovery for on campus use and intended local district heating; no executed heat offtake agreement or operating delivery is established.

Forecast · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162473 · Recorded claim type: Forecast · Review: Approved · Claim date: Not stated

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Cooling and power redundancy design · Operator specifies n+1 for flexible cooling and power supply topologies, with block, distributed redundant, catcher or N+2C configurations; not all options simultaneously installed or commissioned.

Forecast · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162474 · Recorded claim type: Forecast · Review: Approved · Claim date: Not stated

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Autonomous operation design upper bound · Operator advertises up to 48 hours of autonomous operation and priority fuel delivery. This is a design specification, not tested runtime at every load or proof of installed generation.

Forecast · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162475 · Recorded claim type: Forecast · Review: Approved · Claim date: Not stated

  1. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Reviewed ber land control context · Maincubes announced completion of a 14-hectare land purchase in Nauen on 21 October 2024. The city identifies AM:PM Grund Alpha GmbH as the development proponent and maincubes as future operator/implementer. This supports an operator reported acquisition, not a verified current land register owner or purchase price.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162565 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. maincubes announces land purchase in Nauen — October 21, 2024

    maincubes · Document date: Oct 21, 2024 · Primary

    Source reference: SRC-8279 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/wp-content/uploads/2026/02/PR_BER02_land_purchase_Nauen_EN.pdf

  2. maincubes stellt Rechenzentrumspläne vor

    Stadt Nauen · Document date: Apr 29, 2024 · Primary

    Source reference: SRC-8283 · Government record · Recorded authority: Official primary

    Source URL

    https://www.nauen.de/meta/lokale-nachrichten/maincubes-stellt-rechenzentrumplaene-vor/

Reviewed ber planning approvals context · Nauen adopted the 6 December 2024 version of Bebauungsplan Rechenzentrum on 25 February 2025. The 2 July 2025 official gazette announced its entry into force. The associated FNP amendment Südliche Erweiterung GE Ost was approved on 6 June 2025 under reference 63.3-01144-25 and became effective with publication. These are zoning instruments, not blanket building or operational approvals.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162566 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Nauen Bebauungsplan Rechenzentrum — executed plan, December 2024 version

    Stadt Nauen · Document date: Not stated · Primary

    Source reference: SRC-8281 · Government record · Recorded authority: Official primary

    Source URL

    https://www.nauen.de/media/9002/rz_plan-ausgefertigt-mit-vermerken.pdf

  2. Amtsblatt für die Stadt Nauen — No. 4, July 2, 2025

    Stadt Nauen · Document date: Jul 2, 2025 · Primary

    Source reference: SRC-8280 · Government record · Recorded authority: Official primary

    Source URL

    https://www.nauen.de/media/8817/nr-4_2-juli-2025_a4.pdf

Reviewed ber parcel scope context · The December 2024 rationale defines a 14.6 ha planning area in Gemarkung Nauen, Flur 17: 35, 36, 157, 159, 209, 210, 211, 212 and parts of 46/7, 232 and 233. Proposed replacements 35 → 257/258, 36 → 259/260 and 210 → 255/256 were still awaiting administrative adoption. Road parcels include public ownership; other land is described as privately owned. This is a dated planning boundary, not the purchased parcel schedule.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162567 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Nauen Bebauungsplan Rechenzentrum — planning rationale, December 2024 version

    Stadt Nauen · Document date: Not stated · Primary

    Source reference: SRC-8282 · Government record · Recorded authority: Official primary

    Source URL

    https://www.nauen.de/media/9003/6_rz_begruendung-satzungsfassung-1224.pdf

Reviewed ber water design conflict context · The December 2024 planning rationale envisaged supplementary water cooling above approximately 28°C, with final quantities left to building approval. The current operator page instead advertises zero process water usage as a design feature. The relationship between these descriptions is unverified; neither proves installed equipment or zero total site water consumption. The planning rationale’s account of absent potable water and sewer connections is historical, not a current field observation.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162568 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Nauen Bebauungsplan Rechenzentrum — planning rationale, December 2024 version

    Stadt Nauen · Document date: Not stated · Primary

    Source reference: SRC-8282 · Government record · Recorded authority: Official primary

    Source URL

    https://www.nauen.de/media/9003/6_rz_begruendung-satzungsfassung-1224.pdf

  2. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Reviewed ber power participants and milestone context · JSM is general contractor for the 110 kV substation and approximately 6 km cable route to Wustermark, not verified campus wide building contractor. JSM reported the substation structural topping out on October 13, 2026. In its October 19 release, JSM said building services installation was scheduled for the end of October, with transformer installation to follow. The release names Lupp as construction partner. The 200 MVA substation rating is not 200 MW commissioned IT or proof of energization.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162569 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Contractor October progress

    JSM Group · Document date: Oct 19, 2026 · Primary

    Source reference: SRC-8180 · Company announcement · Recorded authority: Party primary

    Source URL

    https://jsmgroup.com/topping-out-at-maincubes-berlin-data-centre-campus-marks-major-milestone-for-jsms-first-project-in-germany/

  2. Nauen substation and cable-route groundbreaking — March 24, 2026

    maincubes · Document date: Mar 24, 2026 · Primary

    Source reference: SRC-8284 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/presse/meilenstein-fuer-maincubes-rechenzentrumscampus-in-nauen-spatenstich-fuer-umspannwerk-und-kabeltrasse/

Reviewed ber utility context · The operator reported a signed 200 MW grid connection agreement with E.DIS in August 2025 and identified E.DIS distribution network supply in March 2026. Contracted connection capacity is separate from 200 MVA equipment and 144–186 MW planned IT. The operator's 2027 supply statement is a dated expectation, not proof of energization.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162570 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Nauen substation and cable-route groundbreaking — March 24, 2026

    maincubes · Document date: Mar 24, 2026 · Primary

    Source reference: SRC-8284 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/presse/meilenstein-fuer-maincubes-rechenzentrumscampus-in-nauen-spatenstich-fuer-umspannwerk-und-kabeltrasse/

  2. Zoning and grid agreement

    maincubes · Document date: Aug 4, 2025 · Primary

    Source reference: SRC-8179 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/press/zoning-plan-approved-and-grid-connection-agreement-signed-maincubes-to-begin-development-of-mainhub-berlin-data-centre-campus-in-nauen/

Reviewed ber financing context · DTCP's January 13, 2026 platform financing announcement explicitly includes mainHub Berlin development among supported projects. The package comprises €1.775 billion committed facilities plus a €700 million uncommitted accordion across portfolio refinancing and development. No amount is allocated to Nauen in that disclosure.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162571 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. maincubes platform financing announcement — January 13, 2026

    DTCP · Document date: Jan 13, 2026 · Primary

    Source reference: SRC-8285 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.dtcp.capital/news-and-insights/detail/maincubes-underscores-its-rapid-growth-into-a-leading-european-data-center-platform-under-dtcp-ownership-securing-a-eur-2475-billion-platform-financing/

Reviewed ber service target conflict context · The detailed operator BER02 page gives a Q3 2028 ready for service target, while its portfolio page simultaneously retains Q1 2028 text and a Q3 2028 card. These are inconsistent published targets; no confirmed service date, documented delay or supersession sequence is established.

Reported rounded · maincubes mainHub Berlin Campus / BER02 (Project)

Claim 162572 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. maincubes data-center portfolio — published service-target descriptions

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8286 · Fact sheet · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/

  2. Current campus specifications

    maincubes · Document date: Not stated · Primary

    Source reference: SRC-8178 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.maincubes.com/en/data-centers/berlin-cloud-ai-provider-campus-ber02/

Counterparties and capital

maincubes · Developer, Operator · CMP-1728

This schedule captures public Cartis research. It is not a title, lien or legal-opinion report. Document page/section locators and claim review timestamps are included only when published; this version has no separate locator or claim-review-time feed.