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Reston, Virginia-based Bechtel recently broke ground in Kemmerer, Wyoming, on an advanced nuclear reactor that uses sodium instead of water as a coolant, according to a June 10 news release from the contractor. Bechtel is the engineering, procurement and construction partner on the job, known as the Natrium Demonstration Project, for Bellevue, Washington-based TerraPower. The company, which is chaired by Microsoft founder Bill Gates, specializes in nuclear energy technology. The Associated Press reported in 2024 that the cost to build Natrium would be up to $4 billion.