Ukraine’s Zaporizhzhya Nuclear Power Plant, the largest nuclear facility in Europe, was reconnected to the national power grid on October 23 after a month-long blackout. The reconnection happened only because the International Atomic Energy Agency managed to broker a temporary ceasefire along both sides of the Dnipro River, giving repair crews a window to fix damaged infrastructure without getting shot at.
What happened and why it matters
The plant lost off-site power entirely in late September 2025, triggering what would become a 30-day outage. Repair teams needed to fix the 750 kV Dniprovska power line, the critical artery connecting the facility to Ukraine’s grid. That work required a ceasefire, which the IAEA negotiated between Russian and Ukrainian forces operating in the area.
Reconnection occurred at approximately 09:30 local time on October 23, with full site power restored by 13:00 the same day.
This was the tenth complete loss of off-site power at Zaporizhzhya since Russia took control of the plant in March 2022. Each time, the plant’s safety systems have fallen back on diesel generators. The reactors still contain nuclear fuel that requires continuous cooling. Without external power, that cooling depends entirely on backup diesel generators.
