OpenAI Stargate Wisconsin · Port Washington, WI
Last change recorded 2026-10-04 · Last checked 2026-10-04
Latest: Four buildings complete (announced) · Full build-out complete · 2028-12-31 (plan) · recorded 2026-10-04
Vantage Lighthouse campus, Port Washington: four buildings, close to 1 GW, $15bn+, completion announced for 2028. We Energies' renewables and storage for it are due by end of 2027. ATC's 100-mile transmission line ($1.4bn): the PSC revoked its completeness determination on 2026-08-07 after 500+ amendments, ATC refiled, a decision is expected Q4 2026 and service in late 2027; an analysis puts campus completion no earlier than mid-2028. · source ◐ secondary, confidence medium
Recorded readiness — 2 of 5 applicable milestones have a dated public record
Gate to first power — target 2028-06-30 (estimate) · path: Grid supply · each step must finish its lead time before the target
2 of 3 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) | 2027-03-28 (15 mo before) | 13 mo before (n=26) | 2025-12-01 | context | Groundbreaking · ● | |
| Grid supply agreed | 2027-09-28 (9 mo before) | 7 mo before (n=11) | 2025-12-15 | on record in time | ATC transmission application found complete by the PSC (December) · ◐ | |
| Substation and lines energized | 2028-04-28 (2 mo before) | 15 mo after (n=1) | 2027-12-15 plan | plan inside the deadline | ATC line in service (late 2027) · ◐ | |
| New generation online (context) | 2028-05-28 (1 mo before) | 12 mo after (n=1) | 2027-12-31 plan | context | We Energies renewables and storage for the campus (planned) · ● | |
| Building ready for IT | 2028-06-28 (0 mo before) | 2 mo after (n=7) | no public date | no public date · would need to be done by 2028-06-28 | No date on record | |
| Full build-out complete (context) | 2029-06-28 (-12 mo before) | — | 2028-12-31 plan | context | Four buildings complete (announced) · ● |
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)
Power equipment (from permits, filings and reporting; blank cells were not disclosed)
| Category | Make / model | Units | MW | Status | Date | Note |
|---|---|---|---|---|---|---|
| gas turbine | — | 5 × 220 MW | 1.1 GW | under construction | 2028-03-31 | Same We Energies Oak Creek plant also cited for the Port Washington campus (first four buildings need about 1.3 GW) · ◐ |
Build-out timeline (Epoch AI; dated status notes with IT power; rows after today are estimates)
Recorded fact No public date for building ready for it.
Calculated requirement Substation and lines energized must finish by 2028-04-28; the recorded plan is 2027-12-15. Under the current rule set the recorded dates plus their lead times give a first power no earlier than 2028-06-30 (on the target). This is a floor set by the record, not a forecast.
Sources (Epoch AI selection): Data center page on Vantage website · Environmental Analysis Summary
Epoch AI, 'AI data centers', epoch.ai/data/ai-data-centers (CC BY 4.0); coordinates from GeoNames cities500 (CC BY 4.0) and hand-entered places; overrides in tools/project_overrides.csv with their own sources. Campuses outside the Epoch dataset come from tools/campuses.csv (public reporting, source per row). Data retrieved 2026-10-05. Report a correction to contact@ailoadmap.com (campus id openai-stargate-wisconsin; include the row and a source link).