There are still thousands of Ameren Illinois customers without electricity.
In southern Illinois, Williamson and Franklin Counties are reporting the most outages.
The utility is issuing broad estimates on when power could be restored for customers in the affected regions.
Ameren says the Carbondale and Sparta areas can expect their electricity to return by noon Saturday. It may take until midnight Saturday for the Marion, Mt. Vernon, Anna, Harrisburg and Centralia areas.
Ameren Illinois Senior Vice President for Operations and Technical Services Ron Pate says the extent of pole and wire damage is making the restoration of power challenging.
A few people were injured during Thursday night's storms.
Illinois State Police say a Marion man was seriously injured when he struck a fallen tree while driving his Jeep.
Troopers say 51-year-old Richard Clemmons, Jr. was driving east on Day Road near Childers Road when the accident occurred.
They say a 45-year-old woman was not seriously injured when a large tree crashed onto her vehicle on Illinois 149 near Royalton, just east of River Road. Jackie Stacey stopped her vehicle because of poor visibility from heavy rain when the tree came crashing down.
Two Montana men were hurt in Washington County when strong winds blew their tractor-trailer onto its side on Interstate 64.
The driver of the semi, 65-year-old Brian Johnson and his passenger, 65-year-old Charles Johnson, were taken to a local hospital.
The National Weather Service is also assessing damage from Tuesday's round of severe weather.
It has determined an EF-0 tornado and microburst hit White County on Tuesday with peak winds at 85 mph. It started at 9:40 a.m. 4.5 miles southwest of Norris City and it ended at 9:46 a.m. 3.5 miles southeast of Norris City.
The damage was most focused around and south of Sandy Run Lake in southwest White County. The damage began near the Hamilton-White County line and continued to east of Highway 1, where the damage became more sporadic.
Dozens of trees were uprooted or broken. At least two homes were damaged due to falling trees.
