A swarm of jellyfish has caused major disruption at one of France's largest nuclear power plants, for the second time in a month.
The jellyfish entered the filters of the pumping station and the Paluel nuclear plant, France's national energy firm EDF said.
The incident reduced output at the plant in Normandy by 2.4 gigawatts and crews are working to restore it to full operation.
In August, generation at another major nuclear site in France was also disrupted by jellyfish, after a "massive and unpredictable" swarm forced the Gravelines plant to temporarily cease operations.
The hit represents a near halving of Paluel's 5.2 gigawatt output, after one of its four reactors was shut down and a second was reduced as a protective measure.
