The Zaporizhzhia nuclear plant, Europe’s largest and one of the most fragile sites caught in the middle of the ongoing Ukraine war, is facing a record-breaking crisis after its external power supply remained cut for more than three days.
Ukrainian officials, nuclear safety experts, and international observers are sounding alarms that the prolonged outage risks a catastrophic accident and could mark a turning point in Russia’s efforts to cement control over the facility.
Emergency diesel generators have kept the plant’s critical cooling systems running since the last 750-kilovolt line connecting it to the grid was severed on Tuesday at 4.56pm.
The incident occurred on the Russian-controlled side of the Dnipro River, just a mile from the plant, and no sign has emerged that reconnection is imminent.
Rafael Grossi, the director general of the International Atomic Energy Agency, described the situation as “deeply concerning” in his remarks on Wednesday, noting that the loss of external power at a site housing six nuclear reactors raises the likelihood of a serious accident.
He later met Russian president Vladimir Putin, with both issuing restrained statements that avoided mentioning Zaporizhzhia directly, though Grossi stressed that his meeting was “timely and important.”
Ukraine, supported by several Western experts, believes Moscow is deliberately manufacturing a crisis to assert dominance over Zaporizhzhia.
A Ukrainian government official said, “Russia is using the nuclear power station as a bargaining chip,” suggesting that the Kremlin’s ultimate aim is to restart at least one reactor and connect the facility to the Russian grid. Greenpeace echoed those fears, describing the situation as having entered “a new critical and potentially catastrophic phase.”
The danger stems from the fact that nuclear plants are designed to operate with a steady flow of external electricity to power safety and cooling systems. Without that supply, diesel backup generators step in, but their capacity is finite.
European regulators had established after the Fukushima disaster in 2011 that a nuclear plant should be able to withstand a loss of external power for up to 72 hours. The Zaporizhzhia outage has now exceeded that threshold, entering untested territory that amplifies risk.
According to Russian operators, enough fuel is available on-site to keep the generators running for 20 days, but Grossi warned that such reliance “increases the likelihood of a nuclear accident.”
Seven of the 18 generators at the plant are currently supplying the electricity needed to cool nuclear fuel stored in six reactors. If even part of this system fails, experts warn that the fuel could overheat over weeks, creating conditions for a meltdown.
The comparison to Fukushima looms large: in 2011, a 9.0-magnitude earthquake triggered a shutdown of Japanese reactors, and while backup generators initially worked, they were destroyed by the tsunami that followed.
Within days, three reactors melted down, though containment systems prevented mass casualties. At Zaporizhzhia, the risk comes not from natural disaster but from war and sabotage.
Ukraine insists its armed forces never target the nuclear facility, arguing that such an act would be unacceptably dangerous. Kyiv instead blames Russia for every previous blackout, noting that the power lines crossing Ukrainian-held territory had been struck nine times since Moscow seized the plant in March 2022.
The difference now is that this latest outage occurred on the Russian side, suggesting either deliberate action or neglect. Russian authorities counter by accusing Ukrainian shelling of hindering repair efforts, a claim Ukraine rejects as disinformation.
Satellite analysis published by Greenpeace has revealed extensive Russian construction of new power lines stretching 125 miles from Mariupol, an occupied city in southeastern Ukraine, apparently intended to link the plant directly to Russia’s grid.
A dam has also been built across a water inlet channel near the site, creating a smaller, more secure reservoir to ensure cooling water. Nuclear experts say these measures are preparation for a possible reactor restart, despite the extraordinary risks of attempting such an operation during an active war.
Yuriy Chernichuk, the Russian-appointed director of Zaporizhzhia, stated last week that integration with Russia’s grid was “in its final stages,” raising fears that Moscow is determined to flip the switch regardless of the safety implications.
Greenpeace nuclear specialist Shaun Burnie urged Grossi to act decisively, declaring, “Grossi needs to immediately tell the Russian government to abandon its plans for reactor restart and to make clear that they alone are responsible for the nuclear safety and security crisis.”
The geopolitical stakes are high. The Zaporizhzhia plant once supplied electricity to four million homes in Ukraine, symbolizing both energy independence and national resilience.
Its occupation has become a bargaining chip in broader negotiations between Putin and former US president Donald Trump, who has suggested at various points that the United States could “take control” of Ukrainian reactors.
The Kremlin, meanwhile, insists it will restart all six reactors and fold them into its own grid—a move feasible only under peacetime conditions, yet one it may attempt in defiance of international norms.
As Europe’s largest nuclear plant, Zaporizhzhia represents not only a frontline battlefield asset but also a potential source of transnational disaster.
A meltdown or significant release of radioactive material could impact vast swathes of Ukraine, Russia, and neighboring states, while undermining public trust in nuclear energy worldwide.
For Kyiv, maintaining the integrity of the plant is both a safety imperative and a sovereignty issue. For Moscow, it appears to be a lever of control, a means to solidify its grip on occupied territory, and perhaps a threat to wield over the international community.
The longer the plant remains without external power, the greater the uncertainty becomes. Even if diesel supplies last for weeks, logistical challenges of resupply in a war zone cast doubt on the sustainability of the stopgap solution.
Ukrainian officials emphasize that every additional day compounds the danger, while experts warn that once a nuclear accident begins, containment options shrink rapidly.
Grossi has pledged that the IAEA will continue monitoring, but critics argue that the agency lacks the authority to force Russian compliance or prevent a dangerous restart.
As one Ukrainian official put it, “They will portray themselves as saviours,” referring to Russia’s possible narrative if it restores power through its own lines.
But behind that portrayal lies a stark reality: the Zaporizhzhia nuclear plant is being held hostage in a geopolitical struggle, its reactors turned into pawns of war, and its safety hanging by a thread.
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