maincubes mainHub Berlin Campus / BER02

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

Operator plot area and coordinates confirmed.

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.