The repetitive booming noise lasted a few minutes, as a massive turbine collapsed to the ground off Fisher Way.
Noble officials said the 9:45 a.m. collapse sparked a small fire at the base of the turbine.
Neighbors could see thick, black smoke billowing at the rural wind park as Altona and Ellenburg Depot crews arrived to extinguish the blaze.
No one was injured during the collapse.
The entire Altona wind park was shut down after the accident, but officials said no danger was posed to the public.
After two years of construction, dozens of turbines are scattered across the Northern Tier. There are about 270 turbines between the various projects in Clinton and Franklin counties.
It can take weeks to construct and energize a single turbine, which at full height stands about 392 feet tall.
Friday's collapse was the first major incident at any of the area wind parks, which are insured.
Noble officials are continuing to investigate and refused Friday to release any additional information or say whether the collapse caused any other damage.
In a news release, Noble Environmental CEO Walt Howard said: "Noble values the safety of its employees and neighbors above all else. Noble has committed its full resources to understanding the cause of this incident."
Local firefighters referred all comments to Noble.
It was still unclear Friday afternoon what caused the collapse.
E-mail Andrea VanValkenburg at:
avanvalkenburg@pressrepublican.com
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