1 EXHIBIT 12-15 THE DETROIT EDISON COMPANY COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES Year Ended December 31 ------------------------------------------------------ 1998 1997 1996 ---- ---- ---- (Millions, except for ratio) Net income................................... $ 418 $ 417 $ 328 --------------- ---------------- --------------- Taxes based on income: Current income taxes...................... 280 308 224 Deferred taxes - net...................... (5) (6) 16 Investment tax credit adjustments - net... (15) (14) (15) Municipal and state....................... 3 4 3 --------------- ---------------- --------------- Total taxes based on income............. 263 292 228 --------------- ---------------- --------------- Fixed charges: Interest on long-term debt................ 254 262 275 Amortization of debt discount, premium and expense............................. 11 11 12 Other interest............................ 13 9 4 Interest factor of rents.................. 34 34 34 --------------- ---------------- --------------- Total fixed charges..................... 312 316 325 --------------- ---------------- --------------- Earnings before taxes based on income and fixed charges......................... $ 993 $ 1,025 $ 881 =============== ================ =============== Ratio of earnings to fixed charges........... 3.18 3.24 2.71