Ukraine’s Zaporizhzhia Nuclear Power Plant has lost all off-site electricity supply, the International Atomic Energy Agency reported on Tuesday — a development that raises immediate nuclear safety concerns at Europe’s largest nuclear facility and arrives on the same day that Russia’s Rosatom has begun evacuating personnel from Iran’s Bushehr Nuclear Power Plant, creating an unprecedented simultaneous nuclear safety emergency at two major facilities on two different continents.
The loss of all off-site power at Zaporizhzhia is one of the most serious operational alerts that can occur at a nuclear facility. Off-site electricity is what powers the cooling systems that prevent a reactor’s nuclear fuel from overheating after shutdown — without it, backup diesel generators become the only barrier between a safe cold shutdown and a potential loss-of-coolant accident. The IAEA has consistently identified the repeated loss of off-site power at Zaporizhzhia as the single greatest nuclear safety risk at the plant since Russian forces seized control of the facility in March 2022.
Zaporizhzhia’s six reactors have been in cold shutdown since the plant was taken offline during the conflict, meaning no active nuclear chain reaction is occurring. However, spent nuclear fuel continues to generate decay heat for months and years after shutdown and requires continuous cooling to prevent fuel damage. That cooling depends on electricity — and with all off-site power now lost, the plant is operating on backup diesel generators whose fuel supply, reliability, and maintenance status under wartime conditions have been a persistent concern for the IAEA’s resident monitoring team stationed at the facility.
The IAEA has warned on multiple previous occasions that Zaporizhzhia has come dangerously close to losing all power simultaneously. On several occasions since 2022, the plant has operated on a single remaining power line — what the agency described as the last line of defence before a complete blackout scenario. Tuesday’s report that all off-site electricity supply has been lost represents the worst-case scenario the agency has repeatedly warned about materialising.
The global nuclear safety picture on Tuesday is deeply alarming in its simultaneity. Rosatom’s evacuation of Bushehr in Iran reflects Russian operators’ assessment that proximity strikes have made the facility too dangerous for its personnel. The IAEA has been monitoring both situations with mounting concern. The agency’s resources, diplomatic attention, and technical capacity are now stretched across two concurrent nuclear facility emergencies — one in a European war zone, one in an active Middle Eastern conflict zone.
For the broader geopolitical context, the Zaporizhzhia power loss arrives as Lavrov is in Beijing for talks with Wang Yi, as US-Iran negotiations may resume Thursday, as Brent crude is above $102 per barrel, and as the April 21 ceasefire deadline approaches. The two nuclear facility emergencies add a dimension to the current global crisis that goes beyond energy markets and military strategy — they introduce the possibility of radiological events in two of the world’s most geopolitically sensitive regions simultaneously.
The IAEA has not yet indicated how long the power loss has been in effect, what caused it, or whether backup generators have successfully taken over. Business Upturn will update this article as further information becomes available from the agency.
Disclaimer: This article is based on official IAEA communications. Nuclear safety information is technical in nature and subject to rapid development. Business Upturn is not responsible for any decisions made based on this article.