Exhibit 12.2 Public Service Company of Oklahoma Consolidated Ratio of Earnings to Fixed Charges For Years Ended December 31 1995 1994 1993 1992 1991 (thousands, except ratios) Operating income $111,769 $98,258 $72,156 $78,096 $86,796 Adjustments: Income taxes 37,490 27,954 13,554 (835) 18,321 Provision for deferred income taxes 2,704 7,779 9,537 21,157 10,133 Deferred investment tax credits (2,789) (2,789) (2,838) (2,711) (2,925) Other income and deductions 2,274 933 531 (940) (1,667) Allowance for borrowed and equity funds used during construction 3,734 2,513 1,948 740 1,931 Interest portion of financing leases -- -- 17 37 34 Earnings $155,182 $134,648 $94,905 $95,544 $112,623 Fixed charges: Interest on long- term debt $29,594 $29,594 $31,410 $30,688 $30,545 Interest on short- term debt and other 6,355 3,844 2,729 1,646 3,286 Interest portion of financing leases -- -- 17 37 34 Fixed charges $35,949 $33,438 $34,156 $32,371 $33,865 Ratio of earnings to fixed charges 4.32 4.03 2.78 2.95 3.33