South Korean companies deepened their ties with TerraPower during Bill Gates's Aug. 14 visit to Seoul, as the U.S. nuclear developer signed new agreements with Hyundai Engineering & Construction and SK Innovation to support commercial deployment of its Natrium reactor technology in the United States, Korea and select international markets. TerraPower said it selected Hyundai Engineering & Construction as engineering, procurement and construction contractor for up to eight future Natrium reactors under a framework agreement that includes completion, price and performance guarantees aimed at supporting conventional commercial financing for a reactor fleet. The company said the partnership is intended to streamline costs, improve design and construction efficiency, strengthen supply chains and accelerate fleet deployment. Separately, TerraPower and SK Innovation signed a term sheet to advance plans for Korea's first commercial Natrium plant and to explore wider international expansion. The companies said they would examine cooperation in engineering and digital innovation, including digital twin technology and artificial intelligence, to help optimize operations and maintenance. The announcement builds on SK Inc. and SK Innovation's combined $250 million investment in TerraPower in 2022. The latest agreements add to broader South Korean involvement in TerraPower's Natrium program. Doosan Enerbility said it had won orders to manufacture key reactor components for Kemmerer Unit 1 in Wyoming, while HD Hyundai and Hyundai Engineering & Construction had already agreed in May to cooperate on commercialization of the sodium-cooled reactor. TerraPower said the first Natrium plant, being developed under the U.S. Department of Energy's Advanced Reactor Demonstration Program, is expected to be completed in 2030. The company also has an agreement with Meta for up to eight Natrium plants by 2035, underscoring how advanced nuclear is being positioned to meet rising power demand, including from AI infrastructure.