Natrium Kemmerer Unit 1 — 345 MW sodium-cooled fast reactor with integrated molten-salt energy storage system (boostable to 500 MW peak), Kemmerer, Wyoming — first utility-scale advanced nuclear plant under construction in US history

TerraPower formally commences construction on Natrium Kemmerer Unit 1 in Wyoming — the first utility-scale advanced nuclear power plant under construction in the United States. 345 MW base output (sodium-cooled fast reactor) with a molten-salt thermal storage system enabling 500 MW peak output. Bechtel serves as EPC contractor; GE Vernova Hitachi Nuclear Energy is co-developer; Rocky Mountain Power is the offtaker; DOE ARDP supports financing. ~1,600 workers during 42-month construction; 250 full-time staff at COD targeted 2031. Meta has signed a framework for up to eight Natrium plants by 2035.

Deal Details

Deal Type

Construction Start

Seller / Sponsor

TerraPower

Buyer / Financier

U.S. Department of Energy (Advanced Reactor Demonstration Program)

Offtaker

Rocky Mountain Power (PacifiCorp)

Stage

Construction

Source

TerraPower