Last mentioned: Mar 6, 2026
Target Operation
Estimated date for the reactor to begin commercial power generation.
Target Completion
Expected date for reactor completion and initial grid synchronization.
Permit Issued
The NRC grants the first commercial construction permit for an advanced reactor.
Permit Approval
The NRC officially grants the commercial construction permit, the first since 2016.
Site Preparation
Non-nuclear construction and site grading begin at the Kemmerer location.
Permit Application
TerraPower submits a formal construction permit application to the NRC.
Application Submitted
TerraPower formally submits its construction permit application to the NRC.
Project Announcement
TerraPower and PacifiCorp announce Kemmerer, Wyoming as the site for the first Natrium reactor.
Site Selection
TerraPower and PacifiCorp announce Wyoming as the location for the Natrium demonstration project.
The U.S. Nuclear Regulatory Commission has issued its first commercial nuclear construction permit since 2016, greenlighting a next-generation reactor project in Wyoming. This milestone marks a significant shift in U.S. energy policy toward advanced nuclear technology as a solution for decarbonizing the power grid.
The U.S. Nuclear Regulatory Commission has granted the first commercial construction permit for an advanced, non-light water nuclear reactor in decades. The permit allows TerraPower to begin building its Natrium reactor in Kemmerer, Wyoming, marking a critical milestone for the next generation of American carbon-free energy.