AmerenCIPS was founded in 1902 and today serves nearly 400,000 electric and 190,000 natural gas customers.
AmerenCILCO was founded in 1913 and today provides electricity and natural gas to more than 210,000 customers.
AmerenIP was founded in 1923 and today provides electric service to about 626,000 electric and 421,000 natural gas customers.

Ameren was created by the December 1997 merger of CIPSCO Incorporated (parent company of Central Illinois Public Service) and Union Electric Company. In 2003, Ameren grew with the acquisition of CILCORP, Inc., parent of Central Illinois Light Company, now operating as AmerenCILCO, and in 2004, Ameren acquired Illinois Power Company – now operating as Ameren IP – from Dynegy Inc.

Who Are The Ameren Illinois Utilities?

The Ameren Illinois Utilities – AmerenCIPS, AmerenCILCO and AmerenIP – provide energy services to 1.2 million electric customers and more than 800,000 natural gas customers across the southern two-thirds of Illinois. We take pride in everything we do, whether that’s delivering the energy you count on every day or helping you learn how to use less and save more.

To learn more about the quality of our work, our people and our services, visit our comprehensive About Us section at ameren.com:

Get the facts about the Ameren Illinois Utilities
Explore reliability projects and initiatives
Discover how we’re helping you save energy
Find out about energy assistance, payment options and outages
Learn how to stay safe around your energy systems
See how we’re involved in our communities
And more