EXHIBIT 12 COLUMBUS SOUTHERN POWER COMPANY Computation of Consolidated Ratios of Earnings to Fixed Charges (in thousands except ratio data) Twelve Months Year Ended December 31, Ended 1990 1991 1992 1993 1994 6/30/95 Fixed Charges: Interest on First Mortgage Bonds. . . . . . . . $ 76,181 $ 80,245 $75,866 $74,119 $68,471 $66,894 Interest on Other Long-term Debt. . . . . . . . 12,276 11,489 11,430 10,436 10,221 9,403 Interest on Short-term Debt . . . . . . . . . . 7,539 3,665 3,282 1,305 817 590 Miscellaneous Interest Charges. . . . . . . . . 2,361 2,663 3,158 4,036 4,566 4,652 Estimated Interest Element in Lease Rentals . . 4,900 5,600 4,100 3,700 3,700 3,700 Total Fixed Charges. . . . . . . . . . . . $103,257 $103,662 $97,836 $93,596 $87,775 $85,239 Earnings: Net Income (Loss) . . . . . . . . . . . . . . . $ 96,000 $ 66,979 $ 76,244 $(55,898) $109,845 $106,026 Plus Federal Income Taxes . . . . . . . . . . . 6,178 1,074 27,389 34,154 49,838 45,873 Plus State Income Taxes . . . . . . . . . . . . 2 1 - - 1 3 Plus Fixed Charges (as above) . . . . . . . . . 103,257 103,662 97,836 93,596 87,775 85,239 Total Earnings . . . . . . . . . . . . . . $205,437 $171,716 $201,469 $ 71,852 $247,459 $237,141 Ratio of Earnings to Fixed Charges. . . . . . . . 1.98 1.65 2.05 0.76(a) 2.81 2.78 (a) Ratio includes the effect of the Loss from Zimmer Plant Disallowance of $144,533,000 (net of applicable income taxes of $14,534,000). As a result, earnings for the twelve months ended December 31, 1993 were inadequate to cover fixed charges by $21,744,000. If the effect of the Loss from Zimmer Plant Disallowance were excluded, the ratio would be 2.46 for the twelve months ended December 31, 1993.