Exhibit 12.1 ARIZONA PUBLIC SERVICE COMPANY COMPUTATION OF EARNINGS TO FIXED CHARGES (THOUSANDS OF DOLLARS) Three Months Ended Twelve Months Ended March 31 December 31, --------- -------------------------------------------------------------------------- 2001 2000 1999(a) 1999(b) 1998 1997 1996 --------- --------- --------- --------- --------- --------- --------- Earnings: Net Income $ 61,851 $ 306,594 $ 128,437 $ 268,322 $ 255,247 $ 251,493 $ 243,471 Income taxes 49,790 225,317 65,373 159,488 159,456 153,324 132,961 Fixed Charges 43,749 184,173 184,327 184,327 188,568 195,055 203,855 --------- --------- --------- --------- --------- --------- --------- Total $ 155,390 $ 716,084 $ 378,137 $ 612,137 $ 603,271 $ 599,872 $ 580,287 ========= ========= ========= ========= ========= ========= ========= Fixed Charges: Interest expense $ 33,542 $ 141,886 $ 140,948 $ 140,948 $ 144,695 $ 150,335 $ 158,287 Amortization of debt discount, premium and expense 1,384 6,897 7,323 7,323 7,580 7,791 8,176 Estimated interest portion of annual rents 8,823 35,390 36,056 36,056 36,293 36,929 37,392 --------- --------- --------- --------- --------- --------- --------- Total $ 43,749 $ 184,173 $ 184,327 $ 184,327 $ 188,568 $ 195,055 $ 203,855 ========= ========= ========= ========= ========= ========= ========= Ratio of Earnings to Fixed Charges (rounded down) 3.55 3.88 2.05 3.32 3.19 3.07 2.84 ========= ========= ========= ========= ========= ========= ========= (1) Income Taxes: Charged to operations $ 51,010 $ 229,542 $ 192,015 $ 192,015 $ 192,207 $ 184,737 $ 178,513 Income Tax Benefit - Disallowance (c) N/A N/A (94,115) N/A N/A N/A N/A Charged (credited) to other accounts (1,220) (4,225) (32,527) (32,527) (32,751) (31,413) (45,552) --------- --------- --------- --------- --------- --------- --------- Total $ 49,790 $ 225,317 $ 65,373 $ 159,488 $ 159,456 $ 153,324 $ 132,961 ========= ========= ========= ========= ========= ========= ========= (2) Estimated interest portion of Unit 2 lease payments included in estimated interest portion of annual rentals $ 8,093 $ 33,411 $ 33,878 $ 33,878 $ 34,315 $ 34,720 $ 35,083 ========= ========= ========= ========= ========= ========= ========= - ---------- (a) Net Income for twelve months ended December 1999 reflects an after-tax extraordinary charge of $140 million for a regulatory disallowance. (b) Net Income is shown excluding the effects of the regulatory disallowance. (c) Income taxes reported on the Company's income statement are shown excluding the effects of the regulatory disallowance.