Since the construction of the wind farm in Nozay, breeders report increased mortality of their cattle as well as behavioral disorders.
A new opinion estimates that the waves and the electromagnetic fields generated are not in question.
Will we one day know where this disease that affects certain cows in Loire-Atlantique comes from? In an opinion published Thursday, the health security agency Anses considers in any case "highly improbable" any link between the operation of the Nozay wind farm and the disorders observed in two neighboring cattle farms. Seized by the Ministries of Ecological Transition and Agriculture in 2019 to issue a scientific opinion on the mysterious mortality of cows from two farms, it even considers that the liability of wind turbines would be "excluded".
Since the construction in 2012 of the “Quatre Seigneurs” park, three breeders from two farms have reported increased mortality of their cattle as well as behavioral disorders and a drop in their milk production, which they attribute to the installation of wind turbines at 700 and 1,500 meters from their farms.
"The troubles that breeders are complaining about are real", recognizes Matthieu Schuler, deputy director general of the "science for expertise" pole of ANSES.
These are not, however, attributable to the “physical agents” generated by wind turbines, namely sound waves, vibrations at ground level and electromagnetic fields, concludes ANSES.
"Other causes not studied"
Regarding the decrease in the quantity and quality of milk, reproductive disorders and mortality, the report considers that "the chronology of the disorders is incompatible with the periods of construction and commissioning of the wind farm". For other disorders, "the levels of exposure to most physical agents are low and do not differ from those usually encountered in a farm," adds the study.
“We also interviewed all of our counterpart agencies across Europe.
Today, no equivalent disorder has been reported […] in around twenty European countries ”, specifies Matthieu Schuler.
According to ANSES, the disorders reported by the breeders could have "other unstudied causes", in particular "an unusual level of exposure to parasitic currents in the buildings of the two farms".
A parasitic current, to which cattle are particularly sensitive, is a low voltage current whose circulation is neither desired nor controlled.
Legal actions
In 2019, experts in the veterinary, electrical, electromagnetic and geobiological fields dispatched to Nozay had established no "direct link" between the disorders reported by farmers and wind turbines.
Several legal actions have, however, been brought by the breeders concerned.
At the end of November, the Nantes court ordered an expert appraisal of the site's electrical cables, which must be returned by July 31, 2022 at the latest.
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