Ameren Illinois
Ameren Illinois serves approximately 1.2 million electric customers across central and southern Illinois, including Springfield, Peoria, Champaign, and East St. Louis.
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About Ameren Illinois
Ameren Illinois is a subsidiary of Ameren Corporation, serving approximately 1.2 million electric customers across central and southern Illinois, including Springfield, Peoria, Champaign, and East St. Louis. Ameren Illinois operates within the MISO (Midcontinent Independent System Operator) regional grid, distinct from ComEd's PJM territory. Ameren also provides natural gas service to much of middle and southern Illinois. As with ComEd, Ameren does not sell electricity supply directly — customers choose their own Alternative Retail Electric Supplier or default to Ameren's regulated supply rate.
How to Switch
Ameren Illinois territory residents can compare supplier plans on 97 Options and switch without interruption — Ameren continues handling delivery and outages regardless of your chosen supplier.
Frequently Asked Questions
Is Ameren Illinois the same grid as ComEd?
No, Ameren Illinois operates within the MISO regional grid, while ComEd operates within PJM Interconnection — these are separate wholesale electricity markets.
Does Ameren Illinois also provide natural gas?
Yes, Ameren Illinois provides natural gas service to much of middle and southern Illinois, including Danville, Decatur, Quincy, and Marion.