US $1.425B Commonwealth Edison Company Public Offering of First Mortgage Bonds

Winston & Strawn served as underwriters' counsel to BofA Securities, Citigroup, Loop Capital Markets, RBC Capital Markets and U.S. Bancorp, as joint book-running managers, in connection with the registered public offering of US$1.425B of First Mortgage Bonds by Commonwealth Edison Company comprised of US$600M First Mortgage 4.550% Bonds, Series 139 due 2031 and US$825M First Mortgage 5.850% Bonds, Series 140 due 2056.