About Ameren Illinois

Ameren Illinois is a regulated electric and gas delivery company headquartered in Collinsville, Illinois.

Infrastructure Improvements

Improving Your Energy Service and Reliability

Senior Management

Our leaders guide us in initiatives focused on safety, reliability and energy efficiency.

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Service Territory

Our service territory spans 43,700 square miles, or about three-quarters of Illinois.

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Energy Efficiency

Find energy efficiency tips and access helpful programs, rebates and cost incentives.
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We are committed to keeping customers, coworkers and our communities safe.
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Browse our latest news, photos, videos, and other resources for the media.
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