The company said its offering provides a new electricity choice with affordable rates to electricity customers in the Greater Chicago, Rockford and Joliet areas.

Ambit Energy will provide electricity service to approximately 3.8 million ComEd customers.

The company first entered the Illinois market in 2008, providing alternative gas service to customers in the NICOR territory.

US-based Ambit Energy provides electrical and natural gas services in deregulated markets across the US, including regions of Texas, Illinois, New York, Pennsylvania and Maryland.