The group had warned in June that quality issues at its troubled Siemens Gamesa wind unit were worse than previously thought, sending its share plunging more than 30%

After initially estimating the repair cost at more than a billion euros, Siemens Energy announced a €1.6 billion charge to resolve the issues affecting “certain rotor blades and main bearings in the 4.X and 5.X platforms”.

The charge weighed heavily on the company’s overall performance in its fiscal third quarter, which slumped to a net loss of €2.9 billion compared with a loss of €564 million over the same period a year earlier.

The result was also dragged lower by extra charges of €600 million in its offshore wind business, which has been hit by “higher product costs” and difficulties ramping up capacity.

Siemens Energy said it was “additionally burdened” by a €700 million write-down of deferred tax assets during the quarter.

Looking ahead, the group now expects a significantly larger full-year net loss of €4.5 billion, following a €712 million loss the previous year.

Siemens Energy said it had set up “a special committee for a detailed investigation of the quality and productivity problems at Siemens Gamesa”.

The company plans to give an update on its wind strategy at an investor day in November.