U.S. hits milestone as three advanced SMRs reach criticality, but commercialization remains years away

Three U.S. advanced reactors backed by the Energy Department have reached criticality, meeting a July 4 target and signaling progress toward a nuclear renaissance, with Deployable Energy’s unit the third to go critical and Aalo Atomics expected to follow. While DOE touts momentum and the potential for quicker development, experts say commercial deployment could still take years due to licensing by the NRC, fuel supply challenges (HALEU), and financing hurdles, though a proposed rule could speed up regulatory reviews for approved designs.