Public Service Company of Northern Illinois,

nsull also initiated construction of a much larger power plant on Harrison Street, west of the Chicago River. While its original capacity of 6,400 kilowatts, twice that of the Adams Street Station and the largest in the United States, seemed wildly optimistic when it opened in August, 1894, Insull believed that the economy of scale provided by such a large station would offset the initial cost. Aside from this point, the size of the station allowed it to replace the Adams Street Station, which had become both overloaded and obsolescent. Insull's optimism was rapidly justified: the Harrison Street Station reached its original capacity within the first several years, and was expanded to 16,200 kilowatts by 1903.[8]
In 1907, Chicago Edison combined with Commonwealth Electric to form Commonwealth Edison Company. Six years later, it absorbed the independent Cosmopolitan Electric Company, and with that purchase effectively obtained a monopoly on electric service in Chicago.[9]
Insull also founded Public Service Company of Northern Illinois, which developed rural electrification in northern Illinois outside Chicago. Public Service and ComEd, along with many other companies, were subsidiaries of Insull's Middle West Utilities Company until Middle West's collapse during the Great Depression. According to at least one source[10] Insull was also the earliest to develop transmission companies, in the 1920s, a concept that was undermined by the development of Public Utility Commissions, in general, and the Public Utilities Company Holding Act of 1935, in particular. Necessary regulation in that form has been overcome by recent deregulatory measures.
In 2000, then-ComEd parent Unicom Corporation merged with PECO Energy to form Exelon Corporation, which now owns both Commonwealth Edison and Philadelphia-area utility PECO (formerly Philadelphia Electric Company).





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