America Quietly Achieved a Nuclear First: Three Advanced Reactors Reach Critical

[Rennhack]

America Quietly Achieved a Nuclear First: Three Advanced Reactors Reach Criticality in One Month

https://www.autonocion.com/us/america-three-brand-new-nuclear-reactor/

[Core Content]

Deployable Energy Ford F-150 reactor core

America just took three brand-new nuclear reactors critical in thirty days, a first for any country, machines the size of shipping containers, one of them built in 150 days on a single-digit-million budget with a core its founder drove to Idaho in the back of a Ford F-150

The United States Department of Energy reached a milestone in June 2026 by achieving criticality for three distinct microreactor designs within a single month. The reactors, developed by Antares Nuclear, Valar Atomics, and Deployable Energy, were tested at Idaho National Laboratory and a private facility in Utah to meet a federal mandate.

These projects represent a shift toward portable, containerized nuclear power rather than traditional grid-scale infrastructure. While these zero-power physics demonstrations validate the underlying reactor designs, they remain distinct from commercial deployment. The industry is now monitoring whether these developers can navigate the Nuclear Regulatory Commission licensing process to meet the growing power demands of data centers.

Three US microreactors just hit criticality in a single month while Canada pours its first SMR basemat — and AI hyperscalers are already circling the shipping-container designs.

The AI power problem has become one of those things everyone in tech mentions in the same breath as "grid queue," "seven-year interconnect wait," and "we'll figure it out."

Hyperscalers keep signing gigawatt deals with existing nuclear plants. Microsoft locked up Three Mile Island's 835 MW under a 20-year power purchase agreement, and Amazon secured 1.92 GW from Talen's Susquehanna plant. But those are old reactors being kept alive or switched back on, not new ones being built. New nuclear was always going to take a decade.

Read the full article at AutoNotion:
https://www.autonocion.com/us/america-three-brand-new-nuclear-reactor/