Headquartered in Oakbrook Terrace, Illinois, Commonwealth Edison (ComEd) is an Exelon subsidiary providing electric distribution service to 4 million customers across northern Illinois including Chicago. With 5000+ employees maintaining 96000+ miles of power lines, ComEd delivers electricity to residential, commercial, and industrial customers across a 11400-square-mile service territory. The company is investing $2.6 billion annually in grid modernization, deploying 4+ million smart meters, upgrading substations, and building a smarter, more resilient energy grid. ComEd’s Energy Efficiency Program helps customers reduce energy usage and save money while advancing Illinois clean energy goals.