An investigation is underway after a turbine collapsed at the Hastkullen part of the 475MW Nysater wind farm complex in Sweden.
The site is equipped with 104 Nordex N149/4.0-4.5 machines and 10 N131/3900 units.
Nysater Wind said the incident happened on 16 July.
A company statement said: “The area around the affected wind turbine is closed and we urge the public not to try to approach this place.
“We suspect that oil from the gearbox may have leaked and the relevant authorities are informed.
“A crash team is on its way to the crashed turbine, and is expected to begin work on Monday 18 July.
“Until their investigation is completed, the entire wind farm will be closed.”
The developer said no-one was injured.
Nordex had not responded to a request for comment at press time.