State Electricity Rates
Illinois Electricity Rate Changes: What Changed in 2026 and What's Next
Published: September 30, 2026 | Last verified: September 30, 2026 Illinois is one of the few states where a real, documented rate change lands on October 1, 2026. Both of the state’s largest utilities reset the default price of the electricity itself (the “supply” part of your bill) for the fall and winter. Ameren Illinois customers in central and southern Illinois see a drop of about 8% from the summer price.