Blankenburg.

The first campus-class site, developed the way the Cube was – engineering before claims. Which is why this page holds process, not promises.

1123, the fortress of Lothar III. Nine hundred years of strategic infrastructure in the Harz.

AS IT STANDS · drone and helicopter footage, 03/2026. Not a render, not a reconstruction.

An empty hall in the Blankenburg building: a tiled floor running the depth of the plate, columns to the left, a fully glazed wall to the right

AS IT STANDSCONCEPT

AS IT STANDS · an existing floor, before fit-out

CONCEPT · the same hall, fitted out at campus density

The ground, per the cadastre.

Drawn from the official ALKIS vector record, LVermGeo open data.

The parcels over the orthophoto — GOLD · the industrial ground on Michaelsteiner Straße. SHADED · Flurstück 1492. Official ALKIS geometry projected onto the aerial, not traced by eye.

The site, on the record.

Phase 0 IT load20 MW IT1

Phase 1 IT load50 MW IT2

Phase 1 targetend 2028 / early 20293

PUE1.204

ZoningGI · BauNVO §95

Relief232–254 m above sea level6

Legal entityBlack Vault Blankenburg GmbH7

AddressMichaelsteiner Straße 28a · Blankenburg (Harz)8

Stand: 08/2026

Two people from the Black Vault team on the cleared campus platform, a tracked dozer behind them — PHOTOGRAPH · 03/2026 · Denys Tsvaig and Anna Bon on the cleared platform at Blankenburg. Photographed by the founders from the helicopter during the site flyover.

The site, in the order you would walk it.

Ground

01 · Ground

Land, zoning, relief, access. What cannot be moved decides everything above it. The open field in this frame is Flurstück 1492, a cadastral parcel; the industrial ground lies to the south.

The Blankenburg ground from the air: the open field, the industrial parcels beside it, the town beyond

Energy

02 · Energy

The connection, the generation on site, the storage path. The first constraint, and the one that takes longest.

The battery room, storage cabinets in rows on their own floor

Water

03 · Water

Closed campus and rack loops; the source water is abstracted, exchanged and returned. Source, temperature and flow are engineering until the water right is granted.

Water running out of a hand-driven mine adit in the Harz, wet rock and ferns around the opening

Compute

04 · Compute

Halls, density, liquid cooling, the boundary between our infrastructure and your hardware.

A drawn-out server tray, GPU accelerators and direct-to-chip liquid cooling, cabling gathered in gold-ringed bundles

Control

05 · Control

Building management, DCIM, energy management, SCADA. What is not measured does not exist.

An open equipment cabinet, rows of energy meters and transducers on DIN rail, wiring combed into vertical bundles

Secure zone

06 · Secure zone

Access rings, operations centre, German jurisdiction, the obligations that come with critical infrastructure.

A corridor of closed doors leading to a lift, lit low along the floor

The adit
Twelve degrees, all year.

A hand-driven mine adit in the Harz runs at 10–12 °C in January and in August. It is a structural thermal resource of the site: pre-cooling in summer, and a cold source for a heat pump in winter. Primary heat rejection is by hybrid dry coolers and ATES. Heat, never electricity, and only once the abstraction permit is granted.

The ground, cut open. Enhanced geothermal reaches heat by drilling two and a half kilometres and fracturing the rock for it. This water was reached by a man with a pick, and it has been running ever since.

Why twelve degrees is worth anything: it sits below what the machines need, so the source water takes heat out of the campus loop across an exchanger. Reaching the town's network is the only step that costs energy, and a heat pump does it.

Cooling source10–12 °C9

Flow8,182 m³/day10

Mine water, thermal capacity1,6 MWth11

In summer

The water takes heat out of the campus loop across an exchanger, without a compressor in that step.

In winter

The same water is the source side of a heat pump – energy taken from the ground rather than bought from the grid.

Afterwards

What the machines reject leaves as district heat, warmer than it arrived and useful to the town.

Source, temperature and flow are engineering figures until the abstraction permit is granted. The thermal capacity is our own arithmetic on our own flow, and it is marked as calculated wherever it appears.

Ground first.

A brownfield with standing industrial buildings, 22 m of relief across the parcel, and utilities already at the boundary. The reasons this site was chosen are physical, not commercial. The adit is not only a cooling source: at 10–12 °C the same water is a heat source for a heat pump in winter and a cooling sink in summer. Heat, never electricity, and only once the abstraction permit is granted.

Relief232–254 m above sea level6

Mönchenbreite~4 ha12

Ground conditionBrownfield with standing industrial buildings; conversion before new build

AccessExisting industrial access; no residential street carries construction traffic

GeologyHarz basement rock – the reason a campus can be founded here at all

Additional landExpansion area identified at Mönchenbreite, adjacent

The site from the air, the town of Blankenburg behind it — AS IT STANDS · the open ground, with the town beyond

The industrial buildings on the site from the air — AS IT STANDS · the standing industrial buildings

square metres newly sealed

The building has stood on this plot for decades. It is converted, not replaced: no excavation, no new ground, no second structure.

The site, in the town it belongs to.

Blankenburg on the slope, the industrial belt along the railway, and the ground itself in the middle of it. None of this is new land: the road, the siding and the neighbours were all here before we were.

Oblique aerial of Blankenburg from the north: the old town on the hillside, an industrial belt along the railway, halls and open ground in the foreground — AS IT STANDS · 03/2026 · looking south across the site, photographed by the founders from the helicopter

What is done, what is running, what is next.

Legal entityBlack Vault Blankenburg GmbH · registered German project companycomplete

Municipal coordinationLetter of intent with the town, 04/2026complete

SiteCampus development active · engineering and local coordination establishedcomplete

MasterplanVorentwurf, 20+ documentscomplete

Grid110 kV / 60 MW application lodged (03/2026)in progress

HeatHeat plan v2 · design basis · joint technical design with the municipal utilityin progress

Critical infrastructureKRITIS applicability · under assessmentin progress

PermittingBuilding application, BImSchG (federal emissions control act), water rights – as the design firms upplanned

Data hallsTarget end 2028 / early 2029planned

Stand: 08/2026

Anna Bon with a representative of the town of Blankenburg — AS IT STANDS · Anna Bon, co-founder and director, with Bürgermeister Heiko Breithaupt at Blankenburg town hall, 03/2026 · the heat concept meeting

Where the project stands

Own capital first

Site assessment, engineering, design and legal are funded by the holding before any external money enters. The pre-FEED is not a pitch document; it is the work.

Developed to customer specification

A campus is developed to customer specification, from powered shell to full fit-out. Ownership and operating model are determined per project and offtake structure.

Figures when they are signed

Grid, capacity and timeline appear on this page when they are committed in writing. That rule is what makes the Cube's pages checkable, and it is not suspended for the bigger project.

The townLetter of intent with the town of Blankenburg, April 2026

HeatHeat export potential up to 35 MWth at the transfer point · joint technical design with Stadtwerke Blankenburg

The siteGI-zoned industrial land, BauNVO §9

Critical infrastructureKRITIS applicability · under assessment

Efficiency targetPUE 1.20 by design

The engineering, by system.

Conversion, at campus scale.

The site is a brownfield with standing industrial buildings. The same rule as the Cube applies: convert what stands before pouring anything new.

Building B · ≈ 10,000 m²Energy blockplanned

Building A · ≈ 1,000 m²Command centreplanned

Building C · ≈ 500 m²Heat stationplanned

Building E · ≈ 400 m²TechHubplanned

Building F · ≈ 250 m²Q-Labplanned

The geology buys the option, not the readiness: basement rock for damping, 10 °C water for pre-cooling, and a no-build buffer around a reserved zone. Vibration and EMI studies come before any of it is a specification. Stillness cannot be added later.

Who is at the table.

Left to right: Lars Gottschligg of I-Kubus, Anna Bon and Denys Tsvaig of 12 Elements, outside the town hall on the day of the heat concept meeting.

Lars Gottschligg, Anna Bon and Denys Tsvaig outside Blankenburg town hall — Blankenburg town hall, 12.03.2026 · the heat concept meeting

What the region gets.

Jobs, construction200+13

Jobs, permanent120+14

Households served500–1,500 household equivalents15

The campus holds a reserved zone for quantum installation, and its protection concept includes counter-UAS systems – both roadmap positions, specified in the project documentation and delivered to buyer specification.

Three of the team on the site in front of a dozer — AS IT STANDS · Denys Tsvaig, Anna Bon and Lars Gottschligg on the Blankenburg platform, 03/2026 · the earthworks that open Phase 1

On site during earthworks — AS IT STANDS · Anna Bon on the Blankenburg platform, 03/2026 · earthworks under way, machine rather than shovel

Not published yet.

The interactive masterplan belongs on this page but is not yet published. The cadastral context above is a public ALKIS-derived boundary record, not the masterplan.

The record.

Public documents carry a revision and a date. Everything else is in the restricted set, released to qualified parties under NDA.

Site factsheetplannedcomplete

Masterplan extractin preparationin progress

Technical overviewplannedcomplete

Heat sheetplannedcomplete

Capacity briefplannedcomplete

The data room.

Qualified investors and buyers see the full engineering record under NDA – the same sheets we plan by, open questions included.

Request access

← The site that already stands: Quedlinburg

Notes

120 MW IT – LONG-TERM TARGET (TARGET) · effective 08/2026 · source: Phased development plan · verified 01.09.2026
250 MW IT – DESIGN BASIS (DESIGN BASIS) · effective 06/2026 · source: Project data sheet · verified 06.08.2026
3end 2028 / early 2029 – LONG-TERM TARGET (TARGET) · effective 08/2026 · source: Project data sheet · verified 07.08.2026
41.20 – DESIGN BASIS (DESIGN BASIS) · effective 08/2026 · source: Technical concept · verified 13.08.2026
5GI · BauNVO §9 – VERIFIED EXISTING (EXISTING) · effective 08/2026 · source: Project data sheet · verified 06.08.2026
6232–254 m above sea level – VERIFIED EXISTING (MEASURED) · effective 08/2026 · source: Cadastral data · verified 07.08.2026
7Black Vault Blankenburg GmbH – VERIFIED EXISTING (EXISTING) · effective 05.08.2026 · source: Commercial register · verified 02.09.2026
8Michaelsteiner Straße 28a · Blankenburg (Harz) – VERIFIED EXISTING (EXISTING) · effective 08/2026 · source: Project data sheet · verified 07.08.2026
910–12 °C – VERIFIED EXISTING (OFFICIAL DATA) · effective 06/2026 · source: Project data sheet · verified 06.08.2026
108,182 m³/day – VERIFIED EXISTING (OFFICIAL DATA) · effective 06/2026 · source: Project data sheet · verified 06.08.2026
111,6 MWth – DESIGN BASIS (CALCULATED) · effective 08/2026 · source: Technical concept · verified 21.08.2026
12~4 ha – VERIFIED EXISTING (OFFICIAL DATA) · effective 08/2026 · source: Cadastral data · verified 07.08.2026
13200+ – LONG-TERM TARGET (TARGET) · effective 08/2026 · source: Project data sheet · verified 06.08.2026
14120+ – LONG-TERM TARGET (TARGET) · effective 08/2026 · source: Project data sheet · verified 06.08.2026
15500–1,500 household equivalents – DESIGN BASIS (DESIGN BASIS) · effective 06/2026 · source: Heat concept · verified 06.08.2026