Microsoft Mount Pleasant AI Campus
Microsoft / OpenAI · Mount Pleasant, Wisconsin, USA
Under Construction
hyperscalertrainingstargatenuclear
Capacity
250 MW
Investment
$7.0B
Status
Under Construction
Expected Online
2027-Q1
Facility Specifications
| Operator | Microsoft / OpenAI |
|---|---|
| Location | Mount Pleasant, Wisconsin, USA |
| Coordinates | 42.5886, -87.9235 |
| Status | Under Construction |
| Capacity | 250 MW |
| GPU Deployment | TBD |
| Purpose | Stargate Phase 2 — OpenAI training |
| Power Source | Grid + nuclear (Three Mile Island restart) |
| Power Deal | Constellation Energy — Three Mile Island Unit 1 (837MW) |
| Investment | $7.0B |
| Announced | Jan 20, 2025 |
| Expected Online | 2027-Q1 |
| Last Updated | Jun 22, 2026 |