Best Buy and Constellation Offer Illinois Residents One Stop Shopping
We power some of America's largest companies. 
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Constellation Education Energy Efficiency
Constellation’s comprehensive energy programs help your school district direct more money to what matters most - books, technology and quality teachers. We evaluate your schools’ energy needs, devise & implement energy efficiency strategies, & monitor energy usage so you’ll know exactly how your programs are performing. Learn more.
About Constellation
Constellation, an Exelon company, is a leading competitive supplier of power, natural gas, renewable energy and energy management products and services for homes and businesses across the continental US. We provide integrated energy solutions—from electricity and natural gas procurement and renewable energy supply to demand-side management solutions—that help customers strategically buy, manage and use their energy.
More than 100,000 commercial, industrial, public sector, government and institutional customers, including two-thirds of the Fortune 100, and more than 1 million residential customers rely on our commitment to innovation, dependability, transparency and service. That is the kind of value you and your communities can expect from Constellation.