EXHIBIT 12.1 SAN DIEGO GAS & ELECTRIC COMPANY COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS 1993 1994 1995 1996 1997 ---------- ---------- ---------- ---------- ---------- Fixed Charges: Interest: Long-Term Debt $ 84,830 $ 81,749 $ 82,591 $ 76,463 $ 69,546 Short-Term Debt 6,676 8,894 17,886 12,635 13,825 Amortization of Debt Discount and Expense, Less Premium 4,162 4,604 4,870 4,881 5,154 Interest Portion of Annual Rentals 9,881 9,496 9,631 8,446 9,496 -------- --------- --------- --------- -------- Total Fixed Charges 105,549 104,743 114,978 102,425 98,021 -------- --------- --------- --------- -------- Preferred Dividends Requirements 8,565 7,663 7,663 6,582 6,582 Ratio of Income Before Tax to Net Income 1.79353 1.83501 1.78991 1.88864 1.91993 --------- ---------- --------- --------- --------- Preferred Dividends for Purpose of Ratio 15,362 14,062 13,716 12,431 12,637 --------- --------- --------- --------- --------- Total Fixed Charges and Preferred Dividends for Purpose of Ratio $120,911 $118,805 $128,694 $114,856 $110,658 ========= ========= ========= ========= ========= Earnings: Net Income (before preferred dividend requirements) $215,872 $206,296 $219,049 $222,765 $238,232 Add: Fixed Charges (from above) 105,549 104,743 114,978 102,425 98,021 Less: Fixed Charges Capitalized 1,483 1,424 2,040 1,495 2,052 Taxes on Income 171,300 172,259 173,029 197,958 219,156 ---------- ---------- ---------- ----------- --------- Total Earnings for Purpose of Ratio $491,238 $481,874 $505,016 $521,653 $553,357 ========== ========== ========== =========== ========== Ratio of Earnings to Combined Fixed Charges and Preferred Dividends 4.06 4.06 3.92 4.54 5.00 ========== ========== ========== =========== =========