Doosan Enerbility Wins Manufacturing Contract for TerraPower's Natrium Reactor

Doosan Enerbility has signed a contract to manufacture key equipment for TerraPower's first Natrium sodium-cooled fast reactor, currently being built in Kemmerer, Wyoming. The deal marks a significant step in the South Korean company's expanding footprint as a global supplier for advanced nuclear technology.

Under the agreement, Doosan Enerbility will produce the core barrel, guard vessel and internal supports for the Natrium demonstration plant. The supplier lineup for the project was first announced in December 2024, when TerraPower selected companies to build the reactor's enclosure system: Spain's Equipos Nucleares SA is responsible for the reactor head, France's Marmen will build the rotating plug, and South Korea's HD Hyundai will manufacture the reactor vessel itself.

Doosan Enerbility said the newly signed contract follows years of design refinement carried out under an earlier manufacturability review agreement. The company noted that it had raised the design to a level of maturity ready for full manufacturing orders, building on what it described as a strong partnership with TerraPower that combines the American firm's reactor technology with Doosan's manufacturing expertise.

Jongdoo Kim, chief executive of Doosan Enerbility's Nuclear Business Group, said the contract reflects years of close collaboration and trust built with TerraPower, adding that the company would work to expand its role as a supplier in the global small modular reactor market.

The Natrium technology, jointly developed by TerraPower and GE Vernova Hitachi Nuclear Energy, is a 345 MWe sodium-cooled fast reactor paired with a molten-salt energy storage system that can temporarily boost output to 500 MWe. That flexibility is designed to let the plant respond to daily swings in electricity demand and complement variable renewable generation on the grid. Non-nuclear construction of the Kemmerer plant began in June 2024, with TerraPower aiming to complete the project, billed as the first commercial-scale advanced nuclear plant in the United States, by 2030 under the US Department of Energy's Advanced Reactor Demonstration Program.

The Doosan contract comes just days after TerraPower signed separate agreements in Seoul with Hyundai Engineering & Construction and SK Innovation to help commercialize Natrium technology across the United States, South Korea and other international markets, building on a trilateral memorandum signed with HD Hyundai in May. Beyond the Kemmerer project, TerraPower also holds an agreement with Meta to supply up to eight Natrium plants by 2035, underscoring growing corporate demand for advanced nuclear power to meet rising electricity needs from data centers and industrial users.