Exhibit (23)-1 Unicom Corporation Form 10-Q File No. 1-11375 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS ----------------------------------------- As independent public accountants, we hereby consent to the incorporation by reference of our report in this Form 10-Q for the quarterly period ended March 31, 1998 (Report), into Unicom Corporation's previously filed prospectuses dated March 18, 1994, constituting part of Form S-4 Registration Statement File No. 33-52109, as amended (relating to Common Stock of Unicom Corporation), as further amended by Post-Effective Amendment No. 1 on Form S-8 (relating to Commonwealth Edison Company's Employee Savings and Investment Plan) and Post- Effective Amendment No. 2 on Form S-8 (relating to Unicom Corporation's Employee Stock Purchase Plan); Form S-8 Registration Statement File No. 33-56991 (relating to Unicom Corporation's Long-Term Incentive Plan), Form S-4 Registration Statement File No. 333-01003 (relating to Common Stock of Unicom Corporation), Form S-8 Registration Statement File No. 333-04749 (relating to Unicom Corporation's 1996 Directors' Fee Plan); Form S-8 Registration Statements File Nos. 333-10613 and 333-26779 (relating to Commonwealth Edison Company's Employee Savings and Investment Plan) and Form S-8 Registration Statement File No. 333-39677 (relating to the Unicom Corporation Management Deferred Compensation Plan). We also consent to the application of our Report to Commonwealth Edison Company and subsidiary companies' ratios of earnings to fixed charges and ratios of earnings to fixed charges and preferred and preference stock dividend requirements for each of the twelve months ended March 31, 1998 and December 31, 1997 appearing in this Form 10-Q. Arthur Andersen LLP Chicago, Illinois May 11, 1998