TerraPower, founded by Bill Gates, has received the first federal construction permit ever granted for a commercial-scale advanced nuclear reactor in the United States. The approval, issued by the U.S. Nuclear Regulatory Commission on March 4, allows the company to proceed with building its Natrium power plant in Wyoming.

The decision marks the first approval for a commercial reactor construction project in the United States in nearly a decade and represents a regulatory milestone for advanced nuclear technology.

 

Regulatory Breakthrough for Advanced Reactors

 

TerraPower submitted its construction permit application in March 2024. The Nuclear Regulatory Commission docketed the application in May 2024 and initially projected a 27 month review timeline. The process concluded in approximately 18 months, reflecting an accelerated review compared with historical nuclear licensing timelines.

The Natrium project is being developed under the U.S. Department of Energy Advanced Reactor Demonstration Program, which aims to commercialize next-generation nuclear technologies through public-private partnerships. Legislative support, including measures under the Nuclear Energy Innovation and Modernization Act, contributed to streamlining the review framework for advanced designs.

 

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Technology Design and Operational Flexibility

 

The Natrium reactor has a base output of 345 megawatts. Unlike conventional light water reactors, it uses liquid sodium as a coolant, allowing operation at lower pressure and reducing the need for heavy containment structures.

The system integrates a molten salt based energy storage component. This design enables the plant to store excess thermal energy and increase electricity output to as much as 500 megawatts during peak demand periods. The inclusion of energy storage differentiates the facility from traditional nuclear plants, which typically operate at steady output levels.

 

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Strategic Context: Electricity Demand and AI Growth

 

The approval comes at a time of rising electricity demand in the United States, driven in part by expansion of data centers and artificial intelligence infrastructure. Advanced nuclear reactors are increasingly being discussed as potential sources of firm, low carbon baseload power capable of supporting grid reliability alongside variable renewable generation.

Proponents argue that advanced reactor designs can address longstanding concerns associated with traditional nuclear plants, including operational safety, fuel efficiency and waste management. Gates has publicly maintained that next-generation nuclear technology can contribute to decarbonization while supporting growing power needs.

If construction proceeds as scheduled, TerraPower expects the Wyoming facility to be operational by 2030. Completion would make it the first utility-scale advanced nuclear power plant in the United States, representing a structural shift in domestic nuclear deployment after decades of limited new reactor builds.