TerraForm Power's electric generation fell by 7.5% in the first quarter, after the US yieldco switched off 70 turbines at its Raleigh and Bishop Hill farms to investigate the collapse of a GE turbine earlier this year.
In January, a blade at a GE 1.5MW turbine spinning at the 78MW Raleigh wind farm in the Canadian province of Ontario cracked and sheared the tower, causing the tower to fold in half.
