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| Type | Company | 
| Location | United States (North America) | 
| Industry | Energy and Water Industries, General | 
| Preceeding org. | Peco Energy Co. (Philadelphia) | 
| GND | 5343336-1 | 
| Holdings | Newspaper clippings: 1970-2004 Annual reports: 1928-1947,1949-1968,1970-1998 | 
| includes | Commonwealth-Edison Co. (Chicago) (-2000); Commonwealth Subsidary Corp. (Chicago, Sign. E 15 C 88 b2 ; GB von 1934); UCM; Unicom Corp. (Chicago) | 
| URI | https://pm20.zbw.eu/folder/co/005056 | 
| ID | co/005056 |