RED WING, Minn. (AP) — A thunderstorm may have triggered a shutdown of Unit 2 of the Prairie Island nuclear plant near Red Wing.

Xcel Energy says the unit automatically tripped at 7:22 a.m. Monday and safely shut down. While operators are investigating the cause, Xcel says it appears to be weather-related. A thunderstorm was in the area when the unit’s generator tripped offline, resulting in the reactor shutdown.

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The company says no one was hurt and no radioactive material was released.

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Prairie Island’s Unit 1 already was shut down for a refueling outage that started on April 29. Xcel says Unit 1 remains in safe condition.

Unit 2 will be restarted as soon as operators confirm what caused the shutdown.

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