Three Mile Island Nuclear AI Campus
Microsoft / Constellation Energy · Middletown, Pennsylvania, USA
Announced
nucleartraininginnovativepennsylvaniamega-project
Capacity
837 MW
Investment
$1.6B
Status
Announced
Expected Online
2028-Q1 (pending NRC approval)
Facility Specifications
| Operator | Microsoft / Constellation Energy |
|---|---|
| Location | Middletown, Pennsylvania, USA |
| Coordinates | 40.154, -76.724 |
| Status | Announced |
| Capacity | 837 MW |
| GPU Deployment | TBD (dedicated to Microsoft / OpenAI training) |
| Purpose | Nuclear-powered AI datacenter — 20-year PPA to restart TMI Unit 1 for Microsoft AI infrastructure |
| Power Source | Nuclear (Three Mile Island Unit 1 restart, 837MW) |
| Power Deal | Constellation Energy — 20-year PPA for 837MW |
| Investment | $1.6B |
| Announced | Sep 20, 2024 |
| Expected Online | 2028-Q1 (pending NRC approval) |
| Last Updated | Jun 24, 2026 |