Exhibit (23) Commonwealth Edison Company Form 8-K File No. 1-1839 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference of our report dated February 19, 1999 on Commonwealth Edison Company and Subsidiary Companies' consolidated financial statements as of and for the year ended December 31, 1998, included as an Exhibit to this Form 8-K Current Report of Commonwealth Edison Company, into Commonwealth Edison Company's previously filed prospectuses as follows: (1) prospectus dated August 21, 1986, constituting part of Form S-3 Registration Statement File No. 33-6879, as amended (relating to the Company's Debt Securities and Common Stock); (2) prospectus dated January 7, 1994, constituting part of Form S-3 Registration Statement File No. 33-51379 (relating to the Company's Debt Securities and Cumulative Preference Stock); (3) prospectus dated September 19, 1995, constituting part of Amendment No. 1 to Form S-3 Registration Statement File No. 33-61343, as amended (relating to Company-Obligated Mandatorily Redeemable Preferred Securities of ComEd Financing I); (4) prospectus dated June 13, 1997 constituting part of Form S-4 Registration Statement File No. 333-28369 (relating to Company-Obligated Mandatorily Redeemable Preferred Securities of ComEd Financing II); and (5) Form S-8 Registration Statement File No. 333- 33847 (relating to the Commonwealth Edison Company Excess Benefit Savings Plan). We also consent to the application of our report to the ratios of earnings to fixed charges and the ratios of earnings to fixed charges and preferred and preference stock dividend requirements for each of the years ended December 31, 1998, 1997 and 1996 appearing in Exhibit 99 of this Form 8- K. ARTHUR ANDERSEN LLP Chicago, Illinois February 24, 1999