Exhibit 12 (d) 1 1 WEST TEXAS UTILITIES COMPANY RATIO OF EARNINGS TO FIXED CHARGES FOR YEARS ENDED DECEMBER 31 1994 1993 1992 1991 1990 (thousands except ratios) Operating income $54,763 $46,576 $57,302 $57,925 $56,810 Adjustments: Federal income taxes 7,900 10,869 12,387 13,283 16,355 Provision for deferred federal income taxes 8,377 3,593 6,426 5,216 1,158 Deferred investment tax credits (1,321) (1,321) (1,515) (1,349) (1,344) Other income and deductions 4,210 1,907 1,114 1,603 1,767 Allowance for borrowed and equity funds used during construction 474 247 156 146 106 Earnings $74,403 $61,871 $75,870 $76,824 $74,852 Fixed charges: Interest on long-term debt $18,547 $19,225 $21,368 $21,339 $22,274 Interest on short-term debt and other 3,534 2,988 2,197 1,967 2,236 Fixed Charges $22,081 $22,213 $23,565 $23,306 $24,510 Ratio of Earnings to Fixed Charges 3.37 2.79 3.22 3.30 3.05