Security conditions at the Zaporizhzhia Nuclear Power Plant, one of the most sensitive sites in the Russia-Ukraine war, are becoming increasingly fragile. Frequent disruptions to external power supplies, continued military activity around the facility, personnel losses and difficulties with fuel deliveries are adding to concerns over nuclear safety.
On August 20, the plant once again lost its external electricity supply following damage to a high-voltage power line. Emergency diesel generators were activated to keep critical safety systems operating.
The Russian-appointed management of the facility said necessary safety measures had been implemented and that no abnormal radiation levels had been detected.
15th Complete Power Outage in 2026
According to Ukraine’s state nuclear energy company Energoatom, the latest incident marked the 15th complete loss of external power at the Zaporizhzhia plant since the beginning of 2026.
Energoatom said the facility has experienced 27 complete power outages since the start of the war.
Energoatom President Pavlo Kovtoniuk warned that the increasingly frequent use of emergency diesel generators is accelerating equipment wear, highlighting the continuing vulnerability of the facility.
Reactors Are Shut Down but Still Need Electricity
All six reactors at the Zaporizhzhia Nuclear Power Plant are currently shut down and are not producing electricity. However, this does not mean the facility no longer requires an external power supply.
Electricity remains essential for cooling nuclear fuel and operating other critical safety systems.
When external power is lost, emergency diesel generators must provide the electricity needed to maintain these systems. Prolonged or repeated outages are therefore considered one of the most serious risks to the plant’s safety margins.
Attacks Around the Plant Raise Further Concerns
In addition to the electricity disruptions, military incidents in and around the facility continue to heighten safety concerns.
On August 18, a drone exploded near a bus stop used by workers at the nuclear plant, leaving one person dead and several others injured.
The International Atomic Energy Agency (IAEA) described the incident as a serious security development directly affecting personnel working at the facility.
Russia blamed Ukraine for the attack, while Kyiv maintains that the dangers surrounding the plant stem from Russia’s occupation of the facility.
The IAEA has repeatedly urged all sides to exercise maximum restraint and avoid military activity that could jeopardize nuclear safety.
One of the War’s Most Serious Nuclear Risks
With six reactors, the Zaporizhzhia Nuclear Power Plant is the largest nuclear energy facility in Europe. It has been under Russian control since March 2022.
Before the war, the facility had access to 10 separate external power lines. According to IAEA data released in July, the number of available external connections had fallen to just one, demonstrating how vulnerable the plant’s electricity supply has become.
No abnormal radiation levels have currently been reported at the facility.
However, continued damage to the electricity infrastructure, repeated reliance on emergency generators and ongoing military activity around the site mean that Zaporizhzhia remains one of the most serious nuclear safety concerns of the Russia-Ukraine war.
