Topic
Natrium
Start here: Natrium, explained: TerraPower's reactor with a built-in battery — NNN's reference piece on this topic.
TerraPower becomes first advanced reactor company to join INPO
TerraPower joined the Institute of Nuclear Power Operations on July 21, 2026 — the first advanced reactor company admitted, backing the 345-MWe Natrium build.
Every Nuclear Plant Under Construction in the US in 2026
The NNN tracker shows one U.S. nuclear unit under construction in 2026: TerraPower's 345 MW Natrium at Kemmerer, Wyoming, with a 2031 completion estimate.
TerraPower begins excavation at Kemmerer Unit 1
TerraPower says crews have begun excavation at Kemmerer Unit 1, moving the 345-megawatt Natrium reactor and storage system toward foundation work.
BWRX-300 vs AP300 vs Natrium: which SMR is actually winning?
BWRX-300 leads on deployment, AP300 banks on AP1000 heritage, Natrium adds storage. How the three highest-profile Western SMR programs compare in 2026.
Natrium, explained: TerraPower's reactor with a built-in battery
Natrium pairs a 345 MWe sodium-cooled fast reactor with molten-salt storage that boosts output to 500 MWe — and it's now under construction in Wyoming.
