Current state
| Status | Under construction |
| Design | Natrium (sodium-cooled fast reactor + molten salt storage) (SFR, SMR) |
| Net capacity | 345 MWe |
| Country | United States |
| Vendor | TerraPower |
| Owner / operator | TerraPower / PacifiCorp offtake |
| Construction start | 2024-06-10 |
| Original COD target | 2030 |
| Current COD estimate | 2031 |
| Schedule slippage | +1 years |
Notes
First US utility-scale advanced reactor in construction; coal-to-nuclear flagship. HALEU supply is the program watch item.
Milestone log
- 2024-06-10 — Non-nuclear construction began at Kemmerer, Wyoming (source)
- 2026-03-04 — NRC issued Part 50 construction permit — first commercial non-light-water US power reactor permit in 40+ years (source)
- 2026-04-23 — Nuclear construction officially commenced; owner expects construction complete by February 2031 (source)
The milestone log is append-only: corrections are recorded as new entries, never rewrites. Full history via /api/v1/changes.