EXHIBIT 12.1 ARIZONA PUBLIC SERVICE COMPANY COMPUTATION OF EARNINGS TO FIXED CHARGES (THOUSANDS OF DOLLARS) Nine Months Ended Twelve Months Ended -------------- -------------------------------------------------------- September 30 December 31 -------------- -------------------------------------------------------- 1999 1998 1997 1996 1995 1994 ---- ---- ---- ---- ---- ---- Earnings: Net Income...................... 92,959(a) $255,247 $251,493 $243,471 $239,570 $243,486 Income taxes (1)................ 48,065 159,456 153,324 132,961 141,267 177,244 Fixed Charges................... 138,224 188,568 195,055 203,855 214,768 213,581 --------- -------- -------- -------- -------- -------- Total......................... 279,248 $603,271 $599,872 $580,287 $595,605 $634,311 ========= ======== ======== ======== ======== ======== Fixed Charges: Interest expense................ 105,612 $144,695 $150,335 $158,287 $168,175 $166,045 Amortization of debt discount, premium and expense........... 5,604 7,580 7,791 8,176 8,622 8,854 Estimated interest portion of annual rents (2).............. 27,008 36,293 36,929 37,392 37,971 38,682 --------- -------- -------- -------- -------- -------- Total......................... 138,224 $188,568 $195,055 $203,855 $214,768 $213,581 ========= ======== ======== ======== ======== ======== Ratio of Earnings to Fixed Charges (rounded down).................. 2.02 3.19 3.07 2.84 2.77 2.96 ========= ======== ======== ======== ======== ======== (1) Income Taxes: Charged to operations........... 166,945 $192,207 $184,737 $178,513 $178,865 $168,202 Income Tax Benefit- Disallowance(b)............... (94,115) N/A N/A N/A N/A N/A Charged (credited) to other accounts...................... (24,765) (32,751) (31,413) (45,552) (37,598) 9,042 --------- -------- -------- -------- -------- -------- Total......................... 48,065 $159,456 $153,324 $132,961 $141,267 $177,244 ========= ======== ======== ======== ======== ======== (2) Estimated interest portion of Unit 2 lease payments included in estimated interest portion of annual rentals............... $ 25,384 $ 34,315 $ 34,720 $ 35,083 $ 35,422 $ 35,710 ========= ======== ======== ======== ======== ======== - ---------- (a) Net Income for nine months ended September 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.