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Westinghouse

Nuclear incumbent; AP1000/AP300 reactors plus the eVinci heat-pipe microreactor.

Cranberry Township, PA, US · 1886
Small Modular Reactors View on the tracker
Milestone note Aug 24, 2026

First criticality for the eVinci heat-pipe microreactor

Reached

Westinghouse / NCERC (LANL, INL, NNSS) — Westinghouse's eVinci test article reached zero-power criticality at 10:39 a.m. PT on 24 Aug 2026 at the National Criticality Experiments Research Center in Nevada, with Los Alamos and Idaho National Laboratory. Zero-power criticality confirms the core's nuclear design — the reaction is self-sustaining — without generating usable heat or power, so it validates physics rather than demonstrating a working reactor. eVinci is a heat-pipe-cooled design with no pumps or coolant loops, sized at 5 MWe for remote sites and data centers; it was separately selected for the US Army's Janus Program at Fort Drum.

Small Modular Reactors Westinghouse
Press · 2026-08 Read
Milestone note Jul 31, 2026

Westinghouse files confidentially for a US IPO — the reactor incumbent joins the nuclear listing wave

Westinghouse Electric confidentially filed for a US IPO on July 31. Jointly owned by Brookfield Renewable (51%) and Cameco (49%), which bought it for $7.9B in 2023, it supplies technology used by more than half the world's operating reactors. Share count and price range aren't set. It follows X-energy, Standard Nuclear and Holtec into the 2026 nuclear listing wave.

Westinghouse
Press · 2026-07-31 Read