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Ameren is a large energy generation and retail company that services both Illinois and Missouri. It came about in 1997 with the merger of Missouri's Union Electric Company and the Central Illinois Public Service Company. Ameren is the incumbent electricity provider for much of central and southern Illinois.

ComEd is the largest electricity company in Illinois, servicing the Chicago and Northern Illinois footprint. ComEd has been the primary electric delivery service company for Northern Illinois for more than 100 years, and is also a division of the Exelon Corporation.

In 2012 Constellation was purchased by Exelon, which has business activities in 47 different states. Exelon is the largest competitive power generator in the United States and is the second largest electricity and natural gas supplier in America.

Eversource, former Connecticut Light & Power, is a local utility that operates in Connecticut, Massachusetts, and New Hampshire.

Nueces Electric Co-Op is an electricity provider that services a very specific area of rural South Texas. As a Co-Op, they are not available for service for every member of the general public. Instead, they have a specific service territory and their customers are also "members."

he United Illuminating Company (UI), established in 1899, is engaged in the purchase, transmission, distribution and sale of electricity and related services to approximately 328,000 residential, commercial and industrial customers in the greater New Haven and Bridgeport areas of Connecticut.