EXHIBIT 12 AVISTA CORPORATION Computation of Ratio of Earnings to Fixed Charges and Preferred Dividend Requirements Consolidated (Thousands of Dollars) 12 months ended Years Ended December 31 June 30, --------------------------------------- 2003 2002 2001 2000 1999 --------- -------- -------- -------- -------- Fixed charges, as defined: Interest expense $ 87,832 $ 96,005 $100,180 $ 64,765 $ 61,666 Amortization of debt expense and premium - net 8,060 8,861 5,639 3,409 3,044 Interest portion of rentals 5,970 6,140 5,140 4,324 4,645 --------- -------- -------- -------- -------- Total fixed charges $ 101,862 $111,006 $110,959 $ 72,498 $ 69,355 ========= ======== ======== ======== ======== Earnings, as defined: Income from continuing operations $ 44,061 $ 42,174 $ 68,241 $109,065 $ 31,223 Add (deduct): Income tax expense 36,345 34,849 40,585 81,143 18,276 Total fixed charges above 101,862 111,006 110,959 72,498 69,355 --------- -------- -------- -------- -------- Total earnings $ 182,268 $188,029 $219,785 $262,706 $118,854 ========= ======== ======== ======== ======== Ratio of earnings to fixed charges 1.79 1.69 1.98 3.62 1.71 Fixed charges and preferred dividend requirements: Fixed charges above $ 101,862 $111,006 $110,959 $ 72,498 $ 69,355 Preferred dividend requirements (1) 4,217 4,387 3,878 41,394 33,914 --------- -------- -------- -------- -------- Total $ 106,079 $115,393 $114,837 $113,892 $103,269 ========= ======== ======== ======== ======== Ratio of earnings to fixed charges and preferred dividend requirements 1.72 1.63 1.91 2.31 1.15 (1) Preferred dividend requirements have been grossed up to their pre-tax level.