Constellation Energy Plans
Constellation is the nation's largest producer of carbon-free energy, offering competitive fixed and renewable electricity plans across ComEd and Ameren territories.
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About Constellation
Constellation is headquartered in Baltimore and stands as the largest producer of carbon-free energy in the United States, with a generation fleet capable of powering roughly 15 million homes. In Illinois, Constellation offers fixed-rate and renewable electricity plans to residential and business customers across both ComEd and Ameren Illinois territories. The company has committed to being 100% carbon-free by 2040, making it a strong option for customers who want a large, financially stable provider with genuine sustainability credentials rather than a marketing-only green label.
Plan Types Offered
Service Areas
Frequently Asked Questions
Does Constellation serve all of Illinois?
Constellation offers plans across both ComEd (northern Illinois) and Ameren Illinois (central and southern Illinois) territories.
Is Constellation a green energy provider?
Constellation is the largest carbon-free energy producer in the U.S. and has committed to being 100% carbon-free by 2040.