En español    Advanced Search Exelon Energy is a retail energy marketer specializing in the supply of natural gas and electricity to commercial and industrial customers since 1998. Exelon Energy currently markets electricity to customers in Illinois and natural gas and renewable energy products to customers in Illinois, Michigan, and Ohio.  Exelon Energy’s parent company, Exelon Corporation, has one of the industry's largest portfolios of electricity generation capacity.      About Exelon Energy Customer Care Renewable Energy   Illinois Electric Customers Illinois Natural Gas Customers Ohio Natural Gas Customers Michigan Natural Gas Customers About Exelon Corporation Exelon Environmental Focus

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