Last Updated 2/19/2016 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) EARNINGS CONTRIBUTION BY SUBSIDIARY (Dollars in Millions) 1 Arizona Public Service 49$ 20$ 29$ 469$ 447$ 22$ 2 El Dorado - (8) 8 (1) (8) 7 3 Parent Company (3) (3) - (12) (15) 3 4 Net income 46 9 37 456 424 32 5 Less: Net Income Attributable to Noncontrolling Interests 5 4 1 19 26 (7) 6 Net Income Attributable to Common Shareholders 41$ 5$ 36$ 437$ 398$ 39$ EARNINGS PER SHARE BY SUBSIDIARY - DILUTED 7 Arizona Public Service 0.44$ 0.18$ 0.26$ 4.21$ 4.02$ 0.19$ 8 El Dorado - (0.07) 0.07 (0.01) (0.08) 0.07 9 Parent Company (0.03) (0.02) (0.01) (0.11) (0.13) 0.02 10 Net income 0.41 0.09 0.32 4.09 3.81 0.28 11 Less: Net Income Attributable to Noncontrolling Interests 0.04 0.04 - 0.17 0.23 (0.06) 12 Net Income Attributable to Common Shareholders 0.37$ 0.05$ 0.32$ 3.92$ 3.58$ 0.34$ 13 BOOK VALUE PER SHARE 41.30$ 39.50$ 1.80$ 41.30$ 39.50$ 1.80$ COMMON SHARES OUTSTANDING (Thousands) 14 Average - Diluted 111,149 111,284 (135) 111,552 111,178 374 15 End of Period 110,980 110,571 409 110,980 110,571 409 Pinnacle West Capital Corporation Quarterly Consolidated Statistical Summary Periods Ended December 31, 2015 and 2014 3 Months Ended December 31, 12 Months Ended December 31, Page 1 of 4

Last Updated 2/19/2016 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) ELECTRIC OPERATING REVENUES (Dollars in Millions) Retail 16 Residential 328$ 312$ 16$ 1,702$ 1,640$ 62$ 17 Business 349 353 (4) 1,584 1,558 26 18 Total retail 677 665 12 3,286 3,198 88 Wholesale revenue on delivered electricity 19 Traditional contracts 3 11 (8) 12 52 (40) 20 Off-system sales 37 34 3 137 174 (37) 21 Native load hedge liquidation - - - - - - 22 Total wholesale 40 45 (5) 149 226 (77) 23 Transmission for others 7 7 - 34 30 4 24 Other miscellaneous services 10 9 1 23 35 (12) 25 Total electric operating revenues 734$ 726$ 8$ 3,492$ 3,489$ 3$ ELECTRIC SALES (GWH) Retail sales 26 Residential 2,767 2,586 181 13,160 12,838 322 27 Business 3,445 3,486 (41) 14,791 14,747 44 28 Total retail 6,212 6,072 140 27,951 27,585 366 Wholesale electricity delivered 29 Traditional contracts 29 154 (125) 179 714 (535) 30 Off-system sales 2,328 1,038 1,290 6,161 4,482 1,679 31 Retail load hedge management - - - - - - 32 Total wholesale 2,357 1,192 1,165 6,340 5,196 1,144 33 Total electric sales 8,569 7,264 1,305 34,291 32,781 1,510 Quarterly Consolidated Statistical Summary Periods Ended December 31, 2015 and 2014 3 Months Ended December 31, 12 Months Ended December 31, Pinnacle West Capital Corporation Page 2 of 4

Last Updated 2/19/2016 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) AVERAGE ELECTRIC CUSTOMERS Retail customers 34 Residential 1,053,177 1,038,927 14,250 1,046,989 1,033,728 13,261 35 Business 130,846 129,812 1,034 130,505 129,351 1,154 36 Total retail 1,184,023 1,168,739 15,284 1,177,494 1,163,079 14,415 37 Wholesale customers 47 52 (5) 47 55 (8) 38 Total customers 1,184,070 1,168,791 15,279 1,177,541 1,163,134 14,407 39 Total customer growth (% over prior year) 1.3% 1.4% (0.1)% 1.2% 1.4% (0.2)% RETAIL SALES (GWH) - WEATHER NORMALIZED 40 Residential 2,746 2,667 79 13,410 13,228 182 41 Business 3,419 3,464 (45) 14,699 14,688 11 42 Total 6,165 6,131 34 28,109 27,916 193 43 Retail sales (GWH) (% over prior year) 0.6% 1.6% (1.0)% 0.7% (1.0)% 1.7% RETAIL USAGE (KWh/Average Customer) 44 Residential 2,627 2,489 138 12,569 12,419 150 45 Business 26,328 26,857 (529) 113,334 114,007 (673) RETAIL USAGE - WEATHER NORMALIZED (KWh/Average Customer) 46 Residential 2,607 2,567 40 12,808 12,796 12 47 Business 26,129 26,683 (554) 112,634 113,553 (919) ELECTRICITY DEMAND (MW) 48 Native load peak demand 5,526 4,455 1,071 7,031 7,007 24 WEATHER INDICATORS - RESIDENTIAL Actual 49 Cooling degree-days 73 24 49 1,822 1,699 123 50 Heating degree-days 463 290 173 717 535 182 51 Average humidity 41% 36% 5% 31% 28% 3% 10-Year Averages 52 Cooling degree-days 42 42 - 1,751 1,751 - 53 Heating degree-days 357 357 - 881 881 - 54 Average humidity 25% 25% - 24% 24% - Quarterly Consolidated Statistical Summary Pinnacle West Capital Corporation Periods Ended December 31, 2015 and 2014 3 Months Ended December 31, 12 Months Ended December 31, Page 3 of 4

Last Updated 2/19/2016 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) ENERGY SOURCES (GWH) Generation production 55 Nuclear 2,202 2,174 28 9,464 9,406 58 56 Coal 2,621 2,565 56 10,921 11,550 (629) 57 Gas, oil and other 2,094 1,832 262 7,068 5,975 1,093 58 Total generation production 6,917 6,571 346 27,452 26,931 521 Purchased power 59 Firm load 1,243 1,463 (220) 7,441 7,063 378 60 Marketing and trading 83 102 (19) 380 453 (73) 61 Total purchased power 1,327 1,565 (238) 7,822 7,516 306 62 Total energy sources 8,243 8,136 107 35,274 34,447 827 POWER PLANT PERFORMANCE Capacity Factors 63 Nuclear 87% 86% 1% 94% 94% 0% 64 Coal 61% 60% 1% 65% 68% (3)% 65 Gas, oil and other 28% 21% 7% 24% 17% 7% 66 System average 49% 42% 7% 49% 43% 6% ECONOMIC INDICATORS Building Permits (a) 67 Metro Phoenix 4,969 4,426 543 21,655 18,813 2,842 Arizona Job Growth (b) 68 Payroll job growth (% over prior year) 2.5% 2.1% 0.4% 2.4% 1.9% 0.5% 69 Unemployment rate (%, seasonally adjusted) 6.0% 6.6% (0.6)% 6.1% 6.8% (0.7)% Sources: (a) U.S. Census Bureau (b) Arizona Department of Economic Security 3 Months Ended December 31, 12 Months Ended December 31, Pinnacle West Capital Corporation Quarterly Consolidated Statistical Summary Periods Ended December 31, 2015 and 2014 Page 4 of 4