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 1994 1995 1996 1997 1998 6/30/99 Fixed Charges: Interest on First Mortgage Bonds. . . . . . . . $68,471 $66,811 $59,711 $55,156 $47,323 $44,564 Interest on Other Long-term Debt. . . . . . . . 10,221 8,829 12,125 15,525 23,594 25,875 Interest on Short-term Debt . . . . . . . . . . 817 1,328 2,400 5,104 3,493 2,880 Miscellaneous Interest Charges. . . . . . . . . 4,566 4,657 4,374 4,729 4,459 4,406 Estimated Interest Element in Lease Rentals . . 3,700 4,100 4,600 4,100 5,300 5,300 Total Fixed Charges. . . . . . . . . . . . $87,775 $85,725 $83,210 $84,614 $84,169 $83,025 Earnings: Net Income (Loss) . . . . . . . . . . . . . . .$109,845 $110,616 $107,108 $119,379 $133,044 $130,634 Plus Federal Income Taxes . . . . . . . . . . . 49,838 58,648 60,302 69,760 71,202 70,923 Plus State Income Taxes . . . . . . . . . . . . 1 7 11 6 3 30 Plus Fixed Charges (as above) . . . . . . . . . 87,775 85,725 83,210 84,614 84,169 83,025 Total Earnings . . . . . . . . . . . . . .$247,459 $254,996 $250,631 $273,759 $288,418 284,612 Ratio of Earnings to Fixed Charges. . . . . . . . 2.81 2.97 3.01 3.23 3.42 3.42