EXHIBIT 12 HOUSTON INDUSTRIES INCORPORATED AND SUBSIDIARIES COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES (Thousands of Dollars) Three Twelve Months Ended Months Ended March 31, 1994 March 31, 1994 Fixed Charges as Defined: (1) Interest on Long-Term Debt . $ 87,013 $ 370,025 (2) Other Interest . . . . . . . 5,726 14,302 (3) Preferred Dividends Factor of Subsidiary . . . . . . 13,071 52,752 (4) Interest Component of Rentals Charged to Operating Expense 1,074 4,383 (5) Total Fixed Charges . . . . $ 106,884 $ 441,462 Earnings as Defined: (6) Income Before Cumulative Effect of Change in Accounting for Postemployment Benefits . $ 38,375 $ 427,388 (7) Income Taxes . . . . . . . . 22,289 243,945 (8) Fixed Charges (line 5) . . . 106,884 441,462 (9) Earnings Before Income Taxes and Fixed Charges . . . . $ 167,548 $1,112,795 Preferred Dividends Factor of Subsidiary: (10) Preferred Stock Dividends of Subsidiary . . . . . . . . $ 8,273 $ 33,600 (11) Ratio of Pre-Tax Income to Net Income (line 6 plus line 7 divided by line 6) 1.58 1.57 (12) Preferred Dividends Factor of Subsidiary (line 10 times line 11) . . . . . . . . . $ 13,071 $ 52,752 Ratio of Earnings to Fixed Charges (line 9 divided by line 5) . . . 1.57 2.52