In a news release, Wacker officials said an equipment malfunction led to a hydrogen explosion at the plant and damaged piping leaked chlorosilane, a chemical that creates hydrogen chloride as it comes into contact with moisture in the air.
"Thanks to the immediate action of all response teams involved, there was no risk to the community," the statement reads.
It was the second incident in eight days at the plant. Five workers suffered chemical burns Aug. 30 in a different area of the plant.
A plant worker, a firefighter, four deputies and seven local residents were treated at hospitals after the Sept. 7 explosion.
Tobias Brandis, Wacker global president, said it could take several months to restart production.
"While we are working diligently towards resuming production, the safety of our employees and the community is our top priority," he said. "Therefore, production will not start until a thorough inspection is completed and it is certain that the facility is safe."
The $2.5 billion plant that manufactures chemicals for solar panels said financial effects on Wacker stemming from the explosion are expected to be minor.
The Tennessee Department of Environment and Conservation and the Occupational Safety and Health Administration are investigating the incidents.
This story was updated Sept. 20 at 11:59 p.m.