EXHIBIT 15 June 21, 1998 FirstEnergy Corp.: We are aware that FirstEnergy Corp. (the Company) has incorporated by reference in its Registration Statement on Form S-8 relating to the registration of 525,000 shares of Common Stock and $14,000,000 in principle amount of Deferred Compensation Obligations, its Form 10-Q for the quarter ended March 31, 1999, which includes our report dated May 14, 1999 covering the unaudited interim financial information of the Company contained therein. Pursuant to Regulation C of the Securities Act of 1933, this report is not considered a part of the registration statement prepared or certified by our firm or a report prepared or certified by our firm within the meaning of Sections 7 and 11 of the Act. Very truly yours, Arthur Andersen LLP - 44 -