ARTHUR ANDERSEN LLP Exhibit (15) To CMS Energy Corporation: We are aware that CMS Energy Corporation has incorporated by reference in its Registration Statements No. 33-29681, No. 33-47629, No. 33-60007, No. 33-61595, No. 33-62573, No. 333-32229, No. 333-48899, No. 333-60795 and No. 333-63229 its Form 10-Q for the quarter ended September 30, 1998, which includes our report dated November 10, 1998 covering the unaudited interim financial information contained therein. Pursuant to Regulation C of the Securities Act of 1933, that 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. Arthur Andersen LLP Detroit, Michigan, November 10, 1998.