Christopher M. Crane Clean Energy Center (formerly TMI-1) return to power operations: NRC restart review for Constellation Energy Generation, LLC — under review. Sourced dates and schedule.
Background: NRC reactor licensing process, explained · The ADVANCE Act, explained: what changed and where the NRC stands
Current state
| Type | Restart |
| Outcome | Under review |
| Applicant | Constellation Energy Generation, LLC |
| Facility | Christopher M. Crane Clean Energy Center (formerly Three Mile Island Unit 1) |
| Docket | 50-289 |
| Submitted | 2025-10-31 |
| Docketed (accepted for review) | 2025-12-09 |
| NRC planned schedule | — |
| NRC target date | 2027-03-04 |
| Final safety evaluation | — |
| Decision | — |
| Review time (docketed → decision) | — |
| Submitted → decision | — |
| NRC-reported review duration | — |
| NRC-reported resources vs estimate | — |
Review time is measured in average months from the date the NRC docketed the application to the decision. The NRC's own reported durations may measure to the final safety evaluation instead.
Notes
Shut down September 26, 2019. Facility renamed by amendment 306 dated May 13, 2025. Submitted: date = last part of the restart bundle; first part (50.82 exemption) 2024-11-19. Environmental Report also submitted October 31, 2025. Docketed: date = acceptance of last part. Conflict: NRC facility page lists the exemption acceptance review as December 12, 2024 (ML24355A057); the schedule letter says December 20, 2024. Final safety evaluation: Per-action safety evaluations not yet issued. Decision: Under review; NRC page shows no 'Final Documentation' for the restart actions as of 2026-10-16. Final EA/FONSI issued September 18, 2026 (ML26231A018).
Timeline
- 2025-10-31 — Application received: “By letters dated November 19, 2024, July 31, 2025, October 24, 2025, and October 31, 2025, Constellation Energy Generation, LLC (the licensee), submitted an exemption and three license amendment requests (LARs) to support resumption of power operations” (source)
- 2025-12-09 — Accepted for review (docketed): “By correspondence dated December 20, 2024, September 4, 2025, December 2, 2025, and December 9, 2025, the U.S. Nuclear Regulatory Commission (NRC) staff notified you that your requests had been accepted for review” (source)
The timeline is append-only: corrections are added as new entries. See the NNN Data License Terms for reuse of the event history.
Also tracked
- Crane Clean Energy Center (Three Mile Island Unit 1) in the Nuclear Plant Restarts Tracker Refurbishment
NNN coverage
About Three Mile Island-1
About Constellation Energy
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