Princeton Digital TY1 Saitama · Saitama, Japan
Last change recorded — · Last checked 2026-10-05
$1bn 97 MW Tokyo-area campus; phase 1 ready Q4 2024, 48 MW phase 2 under construction with ready-for-service now expected Q4 2026. · source ◐ secondary, confidence medium
Recorded readiness — 2 of 6 applicable milestones have a dated public record
Gate to first power — target 2024-12-31 (announced) · path: Grid supply · each step must finish its lead time before the target
0 of 0 required steps have a public date. Red = recorded date past the rule-based deadline · grey "no public date" = required step without a record · green = on record in time · context steps never colour.
| Step | Must finish by | Others did it | Known date | Status | Basis | |
|---|---|---|---|---|---|---|
| Site secured (context) | 2023-09-28 (15 mo before) | 13 mo before (n=26) | 2021-07-06 | context | Campus announced (reported) · ◐ | |
| Construction started (context) | 2022-12-28 (24 mo before) | 29 mo before (n=15) | 2022-06-01 | context | Construction start (reported) · ◐ | |
| Full build-out complete (context) | 2025-12-28 (-12 mo before) | — | 2026-12-31 plan | context | Full build-out (announced plan) · ◐ |
This site is energized; lights only show how its recorded steps compared with the lead times.
Lead-time assumptions
- Site secured 15 months before first power — Land under control and campus announced. Rarely binding; shown for context.
- Permits in hand 0 months before first power — Final air and siting permits. Operators often energize on standard or temporary authorisations and receive the major permit later; flagged only when the permit lands more than 6 months after first power or is missing for an on-site plant.
- Grid supply agreed 9 months before first power — Interconnection or large-load agreement approved. Observed median 7 months before first power; the physical works (substation, lines) run in parallel with construction.
- Substation and lines energized 2 months before first power — Utility delivery point live; final tests before the load is taken.
- New generation online 1 months before first power — Utility plant or on-site plant generating; needed just before energization when the grid cannot carry the load alone.
- Major equipment on site 6 months before first power — Turbines, transformers, switchgear delivered; installation and commissioning take the remaining months.
- Construction started 24 months before first power — Groundbreaking of the building that gives first power. Observed 4-26 months for recent AI campuses; Meta's redesigned campuses took 35-58.
- Building ready for IT 0 months before first power — First building ready for IT. 'Complete' or 'opened' is usually reported after first power; flagged only beyond 3 months.
- Full build-out complete -12 months before first power — All announced buildings operational. Comes after first power by design; context only.
- Water supply secured 12 months before first power — Water rights, municipal agreement or desalination contract in hand. Context only; one of the feasibility items.
- Financing closed 12 months before first power — Project financing, anchor lease or committed capital announced. Context only; not applicable when the owner is a hyperscaler building on its balance sheet.
Dated steps (from the sources; later dates are plans)
Build-out timeline (announced phases from public reporting; rows after today are plans)
Recorded fact The site is energized.
Calculated requirement Energized; watch the build-out timeline for the next buildings.
Sources: Princeton Digital to build 97 MW Tokyo-area campus
Campus outside the Epoch AI dataset: facts from the public reporting linked above (tools/campuses.csv), coordinates hand-entered. Data retrieved 2026-10-05. Report a correction to contact@ailoadmap.com (campus id princeton-digital-ty1-saitama; include the row and a source link).