Power project
Kemmerer Power Station Unit 1
Kemmerer, Wyoming · Generation
Construction permit issued
NRC’s docket records the construction-permit decision on March 9, 2026. Operating approval is a separate step.
The electrical design rating is not the reactor’s 840 MW thermal rating. Temporary 500 MWe output uses storage; it is not a second continuous generating block.
Last documented milestone:
Sources checked: September 7, 2026
- Developer / operator
- US SFR Owner / TerraPower
- Technology
- Sodium-cooled nuclear reactor with thermal storage
What the equipment is rated to do
Capacity is not annual energy output or guaranteed availability. MW and MWh describe different quantities.
The documented hurdles
- Permitting / licensingFurther steps required
Construction approval is documented; the plant still needs a separate operating license before it can operate.
The dated trail
Construction application submitted
TerraPower submitted its construction-permit application.
Construction-permit decision recorded
The docket follows the March 4 authorization to issue. NRC states that a separate operating license is required.
Open the supporting records
1. Regulator bulletin · U.S. Nuclear Regulatory Commission
NRC authorizes Kemmerer construction permit
March 4 was authorization to issue; the docket records the March 9 decision. Thermal MW and electrical MW are not interchangeable.
Publication: 2026-03-04 · Checked: 2026-09-07
Source record: natrium-permit-scope
Location in source: Bulletin 26-028; 345 MWe, temporary 500 MWe output and separate operating-license requirement2. Regulatory docket · U.S. Nuclear Regulatory Commission
Kemmerer Unit 1 construction-permit milestones
The milestone table distinguishes actual from target dates. A construction permit is not an operating license.
Publication: Milestones through March 9, 2026 · Checked: 2026-09-07
Source record: natrium-permit-register
Location in source: Key Milestones: March 28, 2024 application and March 9, 2026 construction-permit decision