Overview

• The IAEA confirms the last 750 kV line disconnected at 16:56 on Sept. 23 and says all emergency diesel generators started as the plant remains without off-site power.
• This marks the tenth complete loss of external power at Europe’s largest nuclear station since 2022, underscoring heightened safety risk to reactor and spent-fuel cooling.
• Ukraine’s Energoatom and grid operator Ukrenergo say Russian forces damaged the line and are blocking reconnection, while Russian and plant officials blame Ukrainian strikes.
• The IAEA previously reported diesel stocks were replenished to power generators for roughly 20 days, and Energoatom warns these units are for short-term emergencies only.
• In related security concerns, the IAEA reports a drone detonated about 800 meters from the South Ukraine nuclear plant, and Russian officials say a drone hit a building at the Kursk NPP-2 construction site without casualties.