EXHIBIT (12) COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS Twelve Months Ended March 31, 1996 Income before provision for income taxes and fixed $ 45,047,230 charges (Note A) Fixed charges: Interest on first mortgage bonds $ 14,109,162 Amortization of debt discount and expense less premium 852,523 Interest on short-term debt 412,679 Other interest 279,695 Rental expense representative of an interest factor (Note 117,887 B) Total fixed charges 15,771,946 Preferred stock dividend requirements: Preferred stock dividend requirements not deductible for 2,338,304 tax purposes Ratio of income before provision for incomes taxes to net 1.551 income Nondeductible dividend requirements 3,626,710 Deductible dividends 78,036 Total preferred stock dividend requirements 3,704,746 Total combined fixed charges and preferred stock dividend $ 19,476,692 requirements Ratio of earnings to fixed charges 2.86x Ratio of earnings to combined fixed charges and preferred 2.31x stock dividend requirements [FN] NOTE A: For the purpose of determining earnings in the calculation of the ratio, net income has been increased by the provision for income taxes, non-operating income taxes and by the sum of fixed charges as shown above. NOTE B: One-third of rental expense (which approximates the interest factor).