Experts said a North Dakota wind turbine's rotor and blades crashed to the ground because they weren't properly aligned with a power shaft atop the turbine's steel tower, which caused the rotor's connecting bolts to fail.
Bolt failures caused a wind turbine's rotor and blades to fall from a tower in north-central North Dakota, and six other turbines have been shut down while their bolts are replaced, a state regulator said Thursday.
The turbine box and three huge blades from a wind tower in north-central North Dakota crashed to the ground. The tower is part of a 149-megawatt wind farm owned by Iberdrola Renewables. It includes 71 steel towers.
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