EXHIBIT 12.1 ARIZONA PUBLIC SERVICE COMPANY COMPUTATION OF EARNINGS TO FIXED CHARGES (THOUSANDS OF DOLLARS) Twelve Months Ended ------------------------------------------------------------- December 31 ------------------------------------------------------------- 1999 1998 1997 1996 1995 --------- --------- --------- --------- --------- Earnings: Net Income ..................... 128,437(a) $ 255,247 $ 251,493 $ 243,471 $ 239,570 Income taxes (1) ............... 65,373 159,456 153,324 132,961 141,267 Fixed Charges .................. 184,327 188,568 195,055 203,855 214,768 --------- --------- --------- --------- --------- Total ........................ 378,137 $ 603,271 $ 599,872 $ 580,287 $ 595,605 ========= ========= ========= ========= ========= Fixed Charges: Interest expense ............... 140,948 $ 144,695 $ 150,335 $ 158,287 $ 168,175 Amortization of debt discount, premium and expense .......... 7,323 7,580 7,791 8,176 8,622 Estimated interest portion of annual rents (2) ............. 36,056 36,293 36,929 37,392 37,971 --------- --------- --------- --------- --------- Total ........................ 184,327 $ 188,568 $ 195,055 $ 203,855 $ 214,768 ========= ========= ========= ========= ========= Ratio of Earnings to Fixed Charges (rounded down) ................. 2.05 3.19 3.07 2.84 2.77 ========= ========= ========= ========= ========= (1) Income Taxes: Charged to operations .......... 192,015 $ 192,207 $ 184,737 $ 178,513 $ 178,865 Income Tax Benefit- Disallowance (b) ............. (94,115) N/A N/A N/A N/A Charged (credited) to other accounts ..................... (32,527) (32,751) (31,413) (45,552) (37,598) --------- --------- --------- --------- --------- Total ........................ 65,373 $ 159,456 $ 153,324 $ 132,961 $ 141,267 ========= ========= ========= ========= ========= (2) Estimated interest portion of Unit 2 lease payments included in estimated interest portion of annual rentals ................. $ 33,878 $ 34,315 $ 34,720 $ 35,083 $ 35,422 ========= ========= ========= ========= ========= - -------- (a) Net Income for twelve months ended December 1999 reflects an after-tax extraordinary charge of $140 million for a regulatory disallowance. (b) Income taxes reported on the Company's income statement are shown excluding the effects of the regulatory disallowance.