Power was restored by Sunday afternoon to most of the county's residents who reported outages during a thunderstorm that swept through the area Saturday.
Hundreds of McHenry County residents were without power Saturday evening. By Sunday afternoon, there were fewer than five ComEd customers affected by persisting outages, according to ComEd's website.
ComEd crews on Saturday assessed potential damage in Huntley, Crystal Lake, Harvard, Union and multiple other areas between Woodstock and Marengo, the company said.
Damaged equipment was the cause for some of the outages, according to ComEd.
A severe thunderstorm warning was in effect through 5 p.m. Saturday, according to the National Weather Service, and a thunderstorm watch was in effect through 9 p.m.
Storms had potential to affect counties throughout Illinois, including McHenry, Lake, Kane and DeKalb, according to the service. Residents were warned to expect 60 mph wind gusts that could cause damage to trees, roofs and siding.
Heavy rainfall also threatened flash flooding, and drivers were warned not to go through flooded roadways, according to the service.