Power was restored at St. Clair Square by 12:45 p.m. Thursday, more than two hours after a reported outage, a mall spokeswoman said.
All stores were open again after many had been closed and without power at around 10:30 a.m.
Macy’s, JCPenney and Sears were not affected by the power outage and remained open.
Ameren Illinois cited “equipment failure” at a nearby substation as the cause of the power outage. The outage left more than 100 customers without power in Fairview Heights.
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