Pattern Energy, which owns 40% of the 283MW project, flagged up the blade issue last year, which has led to output losses.

Mitsubishi Heavy Industries has “pretty well identified … the root cause of the problem and the solution”, Pattern chief executive Mike Garland said in a conference call Monday.

There are 118 of Mitsubishi's 2.3MW turbines installed at Gulf Wind, which reached commercial operation in 2009 in southern Texas.

Gulf