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ALTON, Ill. – Tens of thousands of people in Madison County were without power Sunday night.

Ameren Illinois updated the public via Twitter at about 7:30 p.m. stating they were working on an outage affecting Alton, Godfrey, Brighton, Hartford, and Bethalto caused by an unspecified equipment issue inside one of its substations. At its height, more than 25,000 customers lost power.

In Cottage Hills, the fire protection district opened its doors as a warming shelter for anyone who was still experiencing an outage throughout the cold night.