US$700M Commonwealth Edison Co. Public Offering of First Mortgage Bond Offering

Winston & Strawn LLP represented joint book-running managers Citigroup, MUFG, US Bancorp, and Wells Fargo Securities, as underwriters' counsel, in connection with the registered public offering by Commonwealth Edison Co. of US$700M of its First Mortgage 3.125% Bonds, Series 130 due 2051.