The job losses are due to delays in investment decisions for offshore projects in Germany and the resulting lack of follow-up orders.
Some 120 temporary employees left PowerBlades by the beginning of March, while the others are staying with the company until about the end of July, Repower Systems said.
Around 300 permanent staff continue in work. "The company hopes that the general conditions for the German offshore industry quickly improve to such an extent that our customers can make their investment decisions," the company said.
Projects for which Repower Systems is awaiting the green light include RWE Innogy's 54 turbine Innogy Nordsee 1 project.