Zaporizhzhia nuclear plant without external power for over a week, relying on emergency diesel

Europe's largest nuclear power station has been running on emergency diesel for more than a week, and the fuel tank is counting down. The Zaporizhzhia plant, occupied by Russian forces since March 2022 and located in southeastern Ukraine on the banks of the Dnipro River, lost connection to the electrical grid sometime before August 22, 2026. The International Atomic Energy Agency confirmed the outage on Saturday and warned that the facility's six non-operating reactors—which cannot generate power but must be kept cool to prevent catastrophic fuel meltdown—now depend entirely on backup generators. The plant has only ten days of diesel fuel on hand.

This is not the first time. Ukraine's deputy head of military law enforcement, Gyunduz Mamedov, stated on social media that this marks the 27th blackout at the site since Russia launched its full-scale invasion in February 2022. The pattern has become routine enough to count, which itself is a measure of how precarious the situation has become. The facility has not produced electricity since September 2022, more than six months after the invasion began, yet the reactors still require constant cooling. Without power—whether from the grid or from fuel—the fuel inside the cores will heat beyond safe limits.

The immediate problem is fuel supply. The plant had not received a diesel delivery from its primary off-site storage facility for approximately six months before this week. On Thursday and Friday, August 28 and 29, fuel arrived from an alternative location, temporarily easing the crisis. But the ten-day window remains narrow. Rafael Grossi, the director general of the International Atomic Energy Agency, emphasized that diesel availability is critical whenever a nuclear plant loses external power. The Vienna-based agency, which has maintained a permanent presence at Zaporizhzhia since September 2022, is now attempting to negotiate a local ceasefire with both Ukrainian and Russian forces to allow repairs to the electrical lines that would restore off-site power and eliminate the dependence on emergency generators.

The plant sits directly on the front line in this sector of the war, which means both sides have accused the other of attacking it. During the week of August 22-29, the IAEA documented three drone incidents at the facility, injuring two employees. The agency did not attribute the attacks. Earlier in August, a separate drone strike near the plant killed one nuclear specialist and wounded seventeen others; Russia claimed Ukraine was responsible, though no independent verification was offered. In 2024, a fire broke out in one of the cooling towers, and Ukrainian officials accused Russia of deliberately creating the incident as a form of nuclear blackmail against Ukraine and Europe.

The stakes are continental. A loss of cooling at Zaporizhzhia could release radioactive material across borders and affect millions of people. The IAEA's negotiation efforts represent an attempt to break the cycle—to create enough space on the ground for repair crews to work. But as long as the war continues and the front line runs through the plant's grounds, that space may not materialize. The countdown on the diesel supply continues.