South Korea restarted six nuclear reactors ahead of schedule by mid-May 2026, adding 4.75 GW of capacity in response to potential energy shortages from the US-Iran conflict. The six units — Shinwolseong 1, Gori 2, Hanbit 6, Hanul 3, Wolseong 2, and Wolseong 3 — were accelerated from their scheduled maintenance windows. South Korea reduced LNG imports by 7% year-on-year in March 2026. The emergency restarts demonstrate nuclear's unique role as a dispatchable clean energy security asset.