Last Updated 7/30/2015 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) EARNINGS CONTRIBUTION BY SUBSIDIARY (Dollars in Millions) 1 Arizona Public Service 130$ 144$ (14)$ 154$ 172$ (18)$ 2 El Dorado - - - - - - 3 Parent Company (2) (3) 1 (6) (6) - 4 Net Income 128 141 (13) 148 166 (18) 5 Less: Net Income Attributable to Noncontrolling Interests 5 9 (4) 9 18 (9) 6 Net Income Attributable to Common Shareholders 123$ 132$ (9)$ 139$ 148$ (9)$ EARNINGS PER SHARE BY SUBSIDIARY - DILUTED 7 Arizona Public Service 1.17$ 1.30$ (0.13)$ 1.39$ 1.55$ (0.16)$ 8 El Dorado - - - - - - 9 Parent Company (0.03) (0.03) - (0.06) (0.05) (0.01) 10 Net Income 1.14 1.27 (0.13) 1.33 1.50 (0.17) 11 Less: Net Income Attributable to Noncontrolling Interests 0.04 0.08 (0.04) 0.08 0.16 (0.08) 12 Net Income Attributable to Common Shareholders 1.10$ 1.19$ (0.09)$ 1.25$ 1.34$ (0.09)$ 13 BOOK VALUE PER SHARE 39.63$ 38.35$ 1.28$ 39.63$ 38.35$ 1.28$ COMMON SHARES OUTSTANDING (Thousands) 14 Average - Diluted 111,460 111,002 458 111,426 110,925 501 15 End of Period - Basic 110,986 110,407 579 110,958 110,407 551 3 Months Ended June 30, 6 Months Ended June 30, Pinnacle West Capital Corporation Quarterly Consolidated Statistical Summary Periods Ended June 30, 2015 and 2014 Page 1 of 4

Last Updated 7/30/2015 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) ELECTRIC OPERATING REVENUES (Dollars in Millions) Retail 16 Residential 423$ 428$ (5)$ 717$ 710$ 7$ 17 Business 413 416 (3) 749 745 4 18 Total retail 836 844 (8) 1,466 1,455 11 Wholesale revenue on delivered electricity 19 Traditional contracts 4 15 (11) 6 26 (20) 20 Off-system sales 34 30 4 57 78 (21) 21 Native load hedge liquidation - - - - - - 22 Total wholesale 38 45 (7) 63 104 (41) 23 Transmission for others 7 8 (1) 15 16 (1) 24 Other miscellaneous services 9 9 - 16 16 - 25 Total electric operating revenues 890$ 906$ (16)$ 1,560$ 1,591$ (31)$ ELECTRIC SALES (GWH) Retail sales 26 Residential 3,143 3,204 (61) 5,560 5,586 (26) 27 Business 3,721 3,797 (76) 6,981 7,027 (46) 28 Total retail 6,864 7,001 (137) 12,541 12,613 (72) Wholesale electricity delivered 29 Traditional contracts 71 230 (159) 111 374 (263) 30 Off-system sales 1,361 789 572 2,371 1,892 479 31 Retail load hedge management - - - - - - 32 Total wholesale 1,432 1,019 413 2,482 2,266 216 33 Total electric sales 8,296 8,020 276 15,023 14,879 144 Pinnacle West Capital Corporation 3 Months Ended June 30, 6 Months Ended June 30, Quarterly Consolidated Statistical Summary Periods Ended June 30, 2015 and 2014 Page 2 of 4

Last Updated 7/30/2015 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) AVERAGE ELECTRIC CUSTOMERS Retail customers 34 Residential 1,042,275 1,029,918 12,357 1,045,615 1,032,966 12,649 35 Business 130,396 129,197 1,199 130,274 129,015 1,259 36 Total retail 1,172,671 1,159,115 13,556 1,175,889 1,161,981 13,908 37 Wholesale customers 49 55 (6) 47 56 (9) 38 Total customers 1,172,720 1,159,170 13,550 1,175,936 1,162,037 13,899 39 Total customer growth (% over prior year) 1.2% 1.4% (0.2)% 1.2% 1.3% (0.1)% RETAIL SALES (GWH) - WEATHER NORMALIZED 40 Residential 3,186 3,166 20 5,822 5,831 (9) 41 Business 3,776 3,779 (3) 6,984 7,004 (20) 42 Total 6,962 6,945 17 12,806 12,835 (29) 43 Retail Sales (GWH) (% over prior year) 0.3% (0.2)% RETAIL USAGE (KWh/Average Customer) 44 Residential 3,015 3,111 (96) 5,318 5,408 (90) 45 Business 28,538 29,393 (855) 53,586 54,462 (876) RETAIL USAGE - WEATHER NORMALIZED (KWh/Average Customer) 46 Residential 3,057 3,074 (17) 5,568 5,645 (77) 47 Business 28,958 29,251 (293) 53,608 54,286 (678) ELECTRICITY DEMAND (MW) 48 Native load peak demand 6,622 6,289 333 6,622 6,289 333 WEATHER INDICATORS - RESIDENTIAL Actual 49 Cooling degree-days 484 530 (46) 484 530 (46) 50 Heating degree-days 1 6 (5) 254 245 9 51 Average humidity 24% 13% 11% 24% 13% 11% 10-Year Averages 52 Cooling degree-days 485 485 - 485 485 - 53 Heating degree-days 10 10 - 524 524 - 54 Average humidity 17% 17% - 17% 17% - Quarterly Consolidated Statistical Summary Periods Ended June 30, 2015 and 2014 3 Months Ended June 30, 6 Months Ended June 30, Pinnacle West Capital Corporation Page 3 of 4

Last Updated 7/30/2015 Line 2015 2014 Incr (Decr) 2015 2014 Incr (Decr) ENERGY SOURCES (GWH) Generation production 55 Nuclear 2,217 2,197 20 4,727 4,709 18 56 Coal 2,862 2,739 123 5,136 5,535 (399) 57 Gas, oil and other 1,454 1,402 52 2,459 2,448 11 58 Total generation production 6,533 6,338 195 12,322 12,692 (370) Purchased power 59 Firm load 2,002 2,027 (25) 3,258 2,883 375 60 Marketing and trading 105 98 7 189 211 (22) 61 Total purchased power 2,107 2,125 (18) 3,447 3,094 353 62 Total energy sources 8,640 8,463 177 15,769 15,786 (17) POWER PLANT PERFORMANCE Capacity Factors 63 Nuclear 89% 88% 1% 95% 95% - 64 Coal 68% 65% 3% 61% 66% (5)% 65 Gas, oil and other 24% 19% 5% 20% 16% 4% 66 System average 45% 45% - 41% 45% (4)% ECONOMIC INDICATORS Building Permits (a) 67 Metro Phoenix 6,117 5,012 1,105 10,580 10,425 155 Arizona Job Growth (b) 68 Payroll job growth (% over prior year) 2.2% 1.8% 0.4% 2.4% 1.9% 0.5% 69 Unemployment rate (%, seasonally adjusted) 5.9% 6.9% (1.0)% 6.2% 7.0% (0.8)% Sources: (a) U.S. Census Bureau (b) Arizona Department of Economic Security 3 Months Ended June 30, 6 Months Ended June 30, Quarterly Consolidated Statistical Summary Pinnacle West Capital Corporation Periods Ended June 30, 2015 and 2014 Page 4 of 4