Commonwealth Edison, commonly known by syllabic abbreviation as ComEd, is the largest electric utility in Illinois, and the sole electric provider in Chicago and much of Northern Illinois. Its service territory stretches roughly from Iroquois County on the south to the Wisconsin border on the north and from the Iowa border on the west to the Indiana border on the east. In September 2011, ComEd named the first woman to the CEO post, Anne Pramaggiore. When she was promoted within Exelon, ComEd's parent company, Joe Dominguez was named CEO and COO Terence Donnelly was named president while retaining the title COO.
For more than 100 years, Commonwealth Edison has been the primary electric delivery services company for Northern Illinois. Today, ComEd is a unit of Chicago-based Exelon Corporation, one of the nation's largest electric and gas utility holding companies. ComEd provides electric service to more than 3.8 million customers across Northern Illinois.
Commonwealth Edison's transmission lines operate at voltages of 69,000, 138,000, 345,000, and 765,000 volts, delivering power to their 3.8 million customer base. ComEd's subtransmission voltage is 34,500 volts. Their distribution line voltages are 4,160 volts, 7,200/12,470 volts and 7,970/13,800 volts. The company's revenues total more than $15 billion annually.
ComEd has interconnections with We Energies, ITC Midwest, Ameren, American Electric Power, Northern Indiana Public Service, and MidAmerican Electric (MEC).
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