Exhibit 99(d) Entergy Mississippi, Inc. Computation of Ratios of Earnings to Fixed Charges and Ratios of Earnings to Combined Fixed Charges and Preferred Dividends December 31, March 31, 1992 1993 1994 1995 1996 1997 Fixed charges, as defined: Interest on long-term debt $60,709 $52,099 $46,081 $46,241 $42,897 $42,490 Interest on notes payable 36 7 1,348 474 1,633 1,963 Other interest charges 1,636 1,795 3,581 4,164 2,237 2,303 Amortization of expense and premium on debt-net(cr) 1,685 1,458 1,754 756 1,240 1,233 Interest applicable to rentals 521 1,264 1,716 2,173 2,165 2,141 ------------------------------------------------------------------------- Total fixed charges, as defined 64,587 56,623 54,480 53,808 50,172 50,130 Preferred dividends, as defined (a) 12,823 12,990 9,447 9,004 7,720 7,222 ------------------------------------------------------------------------- Combined fixed charges and preferred dividends, as defined $77,410 $69,613 $63,927 $62,812 $57,892 $57,352 ========================================================================= Earnings as defined: Net Income $65,036 $101,743 $48,779 $68,667 $79,210 74,638 Add: Provision for income taxes: Federal and State 4,463 54,418 46,884 71,651 73,994 68,958 Deferred Federal and State - net 20,430 539 (26,763) (35,224) (29,390) (29,645) Investment tax credit adjustment - net (1,746) 1,036 (7,645) (1,550) (3,497) (1,606) Fixed charges as above 64,587 56,623 54,480 53,808 50,172 50,154 ------------------------------------------------------------------------- Total earnings, as defined $152,770 $214,359 $115,735 $157,352 $170,489 $162,499 ========================================================================= Ratio of earnings to fixed charges, as defined 2.37 3.79 2.12 2.92 3.40 3.24 ========================================================================= Ratio of earnings to combined fixed charges and preferred dividends, as defined 1.97 3.08 1.81 2.51 2.94 2.83 ========================================================================= - ------------------------ (a) "Preferred dividends," as defined by SEC regulation S-K, are computed by dividing the preferred dividend requirement by one hundred percent (100%) minus the income tax rate.