TMI-2, the reactor damaged in the 1979 partial meltdown, is being decommissioned by TMI-2 Solutions, an EnergySolutions subsidiary that took the license in December 2020. Work is removing the remaining ~1% of core debris before conventional dismantling; an amended PSDAR was filed in October 2025.
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Current state
| Status | Active dismantling |
| Country | United States |
| Location | Middletown (Londonderry Township), Pennsylvania |
| Site | Three Mile Island Unit 2 |
| Units | Unit 2 |
| Unit count | 1 |
| Reactor types | PWR |
| Owner / licensee | TMI-2 Solutions LLC (EnergySolutions) |
| Decommissioning contractor | EnergySolutions |
| Strategy | Immediate dismantling |
| Final shutdown | 1979-03-28 |
| Decommissioning start | 2020-12 |
| Target completion | 2038 |
| Cost estimate | USD 1.06bn (as of 2019) |
| Spent fuel | About 99% of fuel and core debris removed to Idaho National Laboratory; residual debris (<1,125 kg) to be packaged and stored at an on-site ISFSI. |
| Notable issue | Site of the 1979 accident; residual core debris must be retrieved before dismantling. TMI-1 next door is being restarted as the Crane Clean Energy Center. |
Notes
NRC lists estimated closure 2052 (license incl. ISFSI); TMI-2 Solutions targets decommissioning completion in 2038. Cost $1.06bn in 2019 dollars.
Timeline
- 1979-03-28 — TMI-2 suffered an accident that severely damaged the reactor core. (source)
- 1993 — Initial cleanup finished and the plant entered post-defueling monitored storage. (source)
- 2020-12-18 — NRC-approved license transfer from FirstEnergy to TMI-2 Solutions took effect. (source)
- 2025-10-27 — TMI-2 Solutions submitted an amended Post-Shutdown Decommissioning Activities Report to the NRC. (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
Also tracked
- Crane Clean Energy Center (Three Mile Island Unit 1) in the Nuclear Plant Restarts Tracker Refurbishment
NNN coverage
About EnergySolutions
About Three Mile Island
Related sites
- Biblis Nuclear Power Plant (Units A and B) Active dismantling · Germany
- Brokdorf Nuclear Power Plant (KBR) Active dismantling · Germany
- Brunsbüttel Nuclear Power Plant (KKB) Active dismantling · Germany
- Chinshan Nuclear Power Plant Fuel removal · Taiwan
- Chooz A Active dismantling · France
- Crystal River Unit 3 Site restoration · United States
- Doel Nuclear Power Plant (Units 1-3) Shut down · Belgium
- Dounreay (DFR and PFR fast reactors) Active dismantling · United Kingdom
See all 72 sites in the Nuclear Decommissioning Tracker →
Sources
- Three Mile Island - Unit 2 — U.S. NRC (primary), checked 2026-10-11
- FAQ | TMI-2 Solutions — TMI-2 Solutions (EnergySolutions) (primary), checked 2026-10-11
- Locations of Power Reactor Sites Undergoing Decommissioning — U.S. NRC (primary), checked 2026-10-11