Site and power readiness, stage one

Stage one, first principle

Power owns the calendar

Once the building is no longer the long pole, the interconnection is — and that constraint is structural, not cyclical. The IEA reports that data-centre electricity use surged in 2025 while grid-connection bottlenecks tightened, driving a scramble for alternatives.^[1] Lawrence Berkeley National Laboratory estimates US data centers consumed 4.4% of US electricity in 2023, on a path to 6.7–12% by 2028.^[2] Every site assessed today competes against that curve.

So the first question is not how much power the workload needs, but what power exists here and on what date. Three answers qualify: an existing service with headroom, an executed interconnection agreement with a milestone schedule, or a sized and permitted on-site generation plan. Density then decides how much of that capacity a single placement consumes — Uptime Institute's 2025 survey of more than 800 operators shows fleet rack densities rising into the 10–30 kW band, above what most existing electrical rooms were designed against.^[3]

Categories in detail

Ground, road, fiber, and the authority having jurisdiction

For the item-level survey — the questions to ask and how to score the answers — use the data center readiness checklist. This page covers what those answers mean for the deployment sequence.

Access, pad, and the physics of delivery

Federal size and weight standards on the Interstate System cap a single axle at 20,000 lb, a tandem axle at 34,000 lb, and gross vehicle weight at 80,000 lb, while width on the National Network is fixed at 102 inches — no state may set a higher or lower figure.^[4] Height is left to the states. Units built to ISO series-1 container geometry inherit standard external dimensions, ratings, and corner-fitting positions, which is what lets a route be planned and a lift be rigged from published data rather than a field measurement.^[10]

The route survey runs from the highway to the exact placement point: turning radii at the last intersections, overhead clearance including utility spans, bridge and culvert ratings on the final approach, and a rigging position with the reach and ground bearing to set the unit down. The pad is a civil deliverable — level, drained, load-rated, with anchor points and conduit stub-ups matching the unit's published pattern. Where soils are unknown, the geotechnical work belongs here, not in the week the truck arrives; the move itself is covered in transport and placement.

Network path and entrance

Network readiness is two findings: whether a carrier can serve the site at all, and whether the physical entrance path exists. ANSI/TIA-942 defines the structure behind the second — entrance rooms, pathways, cross-connects, and the distribution areas that connect them — alongside the redundancy topologies that decide whether one backhoe can take the site offline.^[8] Diverse entry means two paths with real physical separation, not two strands in one conduit. How much bandwidth the workload needs is a configuration question; the networking and fiber guide covers the fabric side. Stage one only establishes that a path exists, who owns it, and what it costs to light.

Permitting a unit that was built somewhere else

The ICC/MBI off-site construction standards describe the split: in-plant inspection of what was fabricated off site, third-party inspection agencies, state modular programs, and on-site final inspection of foundation, anchorage, and connections by the local authority having jurisdiction.^[5] Reading that pathway early is what keeps a finished unit from waiting on a permit.

Two code families apply regardless of where the unit was built: electrical work at the site boundary and inside the enclosure follows the National Electrical Code^[6], and batteries bring stationary energy-storage requirements governing siting, separation, and fire protection.^[7] Physical security has its own baseline — the NIST SP 800-53 physical and environmental protection controls cover access authorization, monitoring, visitor records, and emergency shutoff, which a remote or shared site still has to satisfy.^[11] The safety and security guide covers how those controls land in a modular enclosure.

Site conditions the enclosure has to survive

Heat rejection is designed against the site, not a national average. ASHRAE publishes per-station climatic design conditions — cooling design dry bulb, coincident wet bulb, extreme annual dew point — and those are the numbers a dry cooler is sized to, with the as-of edition recorded alongside them.^[9] Altitude derates air-side equipment; coastal salt and industrial dust drive material choices; seismic and flood exposure drive anchorage and pad elevation. None of these disqualify a site alone, but all change the configuration — which is why they belong here rather than in commissioning. The thermal enclosure guide covers what the envelope is asked to do once those conditions are known.