Europe's largest windfarm, Eaglesham Moor, Scotland, has been shut down following an incident where a turbine blade snapped off.
A 150ft, 14t fibreglass blade broke off in windy conditions and landed at the base of its tower, reports the Daily Telegraph.
The cause for break-off has been attributed to mechanical failure or a lightning strike and described to be highly unusual by owner of the wind farm ScottishPower Renewables.
The Whitelee windfarm, which houses 140 wind turbines, generates 355MW of power and began operations in May 2009.
After an initial inspection by turbine manufacturer, Siemens, 65 turbines have now resumed operation.
ScottishPower Renewables said it is currently examining the incident.