Owner of a project-financed onshore portfolio in Europe
One blade rupture, a serial manufacturing defect, and a full fleet blade replacement
The situation
Several adjacent onshore wind farms in Europe, multi-megawatt turbines, with blades supplied from a single manufacturing plant. One blade ruptured in service.
The question
Was the rupture an isolated event, or the first visible sign of a defect present throughout the blade population? And if the latter, what would be needed to close the risk?
What happened
The failure was established as a laminate wrinkle introduced during manufacture: a quality control failure at one plant rather than a design fault. That distinction determined who bore the cost.
Inspection showed the defect was present across most blades from that plant: a serial defect, not an isolated event.
Our position was that nothing short of replacing the entire affected population would close the risk. That is what happened: every blade on the affected wind farms was replaced, with new blades produced in a different plant under prior quality audit and in-production surveillance.
The defective population was eliminated, the turbines returned to normal operation with no manufacturer restriction on power or rotor speed, and the incident was closed technically in an independent expert report to the owner and its lenders.
Why it matters
When a blade fails, the larger question is usually not the failed blade itself but whether the rest of the fleet carries the same defect. Moving from a single rupture to a fleet-wide replacement decision requires forensic evidence, presence during the laboratory work, and the standing to discuss the findings with the manufacturer’s own experts.