1 Exhibit 15-9 DTE Energy Company and The Detroit Edison Company Detroit, Michigan We have made reviews, in accordance with standards established by the American Institute of Certified Public Accountants, of the unaudited interim financial information of DTE Energy Company and subsidiaries and The Detroit Edison Company and subsidiaries for the periods ended September 30, 1998 and 1997, as indicated in our report dated October 28, 1998. Because we did not perform an audit, we expressed no opinion on that information. We are aware that our report referred to above, which is included in your Quarterly Report on Form 10-Q for the quarter ended September 30, 1998, is incorporated by reference in the following Registration Statements: FORM REGISTRATION NUMBER DTE Energy Company Form S-3 33-57545 Form S-8 333-00023 Form S-8 333-47247 The Detroit Edison Company Form S-3 33-53207 Form S-3 33-64296 Form S-3 333-65765 We also are aware that the aforementioned report, pursuant to Rule 436(c) under the Securities Act of 1933, is not considered a part of the Registration Statement prepared or certified by an accountant or a report prepared or certified by an accountant within the meaning of Sections 7 and 11 of that Act. DELOITTE & TOUCHE LLP Detroit, Michigan October 28, 1998