ComEd, or Commonwealth Edison, is the largest electric utility company in Illinois, primarily serving Chicago and much of Northern Illinois. As a unit of Exelon Corporation, it has a rich history dating back to 1882 and is known for its innovative contributions to the energy sector, including operating the first privately financed commercial nuclear power station in the U.S. in 1960.

The company delivers electricity to over 3.8 million customers, including residential, commercial, and industrial users. ComEd is actively modernizing its electric grid with a $2.6 billion investment program, which includes infrastructure upgrades and the deployment of Smart Grid technology. Its energy efficiency programs have significantly reduced energy costs for customers and contributed to lower carbon emissions. ComEd also enhances grid reliability through advanced technology, such as a superconductor-based system, and participates in mutual assistance efforts to restore power in regions affected by severe weather.