Many Macon County residents were in the dark Sunday evening.
Around 8 p.m., An Ameren employee told WAND that more than 12,000 customers were without power and nearly 7,000 in Macon County.
She said, they sent crews to their substation, attempting to fix the issue.
More workers came in to help restore power.
Nearly all of the power outages have been restored in Illinois, as of 10 p.m.