About 20,000 PECO customers in Bucks County lost power Thursday morning, a company spokesman said.
The power went out for about an hour and was restored to all customers just before 8, said spokesman Ben Armstrong.
The cause is under investigation, Armstong said, adding that the utility hadn't determined whether the outages were storm-related or due to an equipment issue.
Lightning strikes were widespread overnight, according to the National Weather Service. Lightning-related house fires were reported in Bucks, Chester, Gloucester, and Cumberland Counties.