J-BoxPlain answer. A modular data center can go from greenfield construction start to commissioned, operating capacity in about two months when electrical, mechanical, fire suppression and security systems are prefabricated and long lead packages are released early. JBox delivered 9 MW of fully commissioned data halls in 62 days on a five acre site in Marshfield, Missouri.
The ask
A greenfield site, a firm operating date and a mission load that could not wait for a conventional build. Power, cooling, backup generation and compute had to arrive as one platform, commissioned together, with an operating handoff the client could run from day one.
A conventional build would have missed the date by quarters, not weeks. The question was not whether to go modular. It was how to sequence modular so the date held.
What was prefabricated, and why
The fastest way to compress a schedule is to move work from the field to the factory, where it runs in parallel with site work instead of after it.
| System | Conventional approach | What we did |
|---|---|---|
| Electrical distribution | Field built switchgear rooms, conduit and terminations | Factory integrated electrical modules, tested before shipment |
| Mechanical | Site assembled cooling plant and piping | Closed loop cooling delivered as skids and connected on site |
| Fire suppression | Designed and installed room by room | Pre engineered systems installed within the modules |
| Security | Installed after the building is enclosed | Integrated at the factory, commissioned with the hall |
| Data halls | Stick built white space | Repeatable hall blocks, each a known quantity |
Every one of those decisions traded architectural flexibility for schedule certainty. For this load, that was the right trade.
The sequence
Prefabrication alone does not deliver 62 days. The sequence does.
- Decisions early. The basis of design was fixed before site mobilization so that nothing waited on a drawing.
- Long lead on authorization. Generators, switchgear and cooling were released the moment the owner authorized them, against factory slots secured in advance.
- Overlapping workstreams. Site civil, foundations and utility work ran while modules were in production. The integrated schedule held the interfaces so a slip in one lane was visible to every other lane the same week.
- Initial pods first. The first pods were operational in roughly a month, which let commissioning begin while the balance of the halls were still arriving.
- Integrated commissioning. Electrical, mechanical, fire, security and IT were verified as one platform, not as five separate acceptance events.
What commissioning still required
Speed did not mean skipped steps. Every system was tested at the factory and again on site. Acceptance ran through the same dashboard JBox uses on every project: commissioning progress, punch list, records, training, spares and the operator handoff. The client received a facility it could run, with the documentation to prove it.
The result
From construction start to operating capacity in 62 days. Fully deployed and commissioned data halls delivering 9 MW. A five acre campus with compute, cooling and backup generation concentrated into an operating footprint of about one acre.
What transfers to the next project
The halls, the skids and the sequencing are repeatable. What transfers is a delivery method: define the block, prefabricate what can be prefabricated, release long lead early, overlap everything that can overlap, and commission as one platform. The number of blocks changes. The method does not.
Questions & answers.
From construction start on a greenfield site to fully commissioned, operating data halls. Site screening, design and procurement release came before that window.