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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Information [Line Items] |
Schedule of quarterly financial information | Consolidated quarterly financial information for 2017 and 2016 is provided in the tables below (dollars in thousands, except per share amounts). Weather conditions cause significant seasonal fluctuations in our revenues; therefore, results for interim periods do not necessarily represent results expected for the year.
| 2017 Quarter Ended |  | 2017
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 677,728 |  |  | $ | 944,587 |  |  | $ | 1,183,322 |  |  | $ | 759,659 |  |  | $ | 3,565,296 |
Operations and maintenance | 219,976 |  |  | 214,013 |  |  | 224,305 |  |  | 266,149 |  |  | 924,443 |
Operating income | 73,506 |  |  | 304,229 |  |  | 466,082 |  |  | 90,610 |  |  | 934,427 |
Income taxes | 4,211 |  |  | 88,967 |  |  | 144,319 |  |  | 20,775 |  |  | 258,272 |
Net income | 28,185 |  |  | 172,317 |  |  | 280,945 |  |  | 26,502 |  |  | 507,949 |
Net income attributable to common shareholders | 23,312 |  |  | 167,443 |  |  | 276,072 |  |  | 21,629 |  |  | 488,456 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — Basic | $ | 0.21 |  |  | $ | 1.50 |  |  | $ | 2.47 |  |  | $ | 0.19 |  |  | $ | 4.37 |
Net income attributable to common shareholders — Diluted | 0.21 |  |  | 1.49 |  |  | 2.46 |  |  | 0.19 |  |  | 4.35 |
| 2016 Quarter Ended |  | 2016
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 677,167 |  |  | $ | 915,394 |  |  | $ | 1,166,922 |  |  | $ | 739,199 |  |  | $ | 3,498,682 |
Operations and maintenance | 243,195 |  |  | 242,279 |  |  | 217,568 |  |  | 208,277 |  |  | 911,319 |
Operating income | 50,162 |  |  | 231,748 |  |  | 451,258 |  |  | 122,816 |  |  | 855,984 |
Income taxes | 1,914 |  |  | 65,742 |  |  | 141,446 |  |  | 27,309 |  |  | 236,411 |
Net income | 9,326 |  |  | 126,182 |  |  | 267,900 |  |  | 58,119 |  |  | 461,527 |
Net income attributable to common shareholders | 4,453 |  |  | 121,308 |  |  | 263,027 |  |  | 53,246 |  |  | 442,034 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — Basic | $ | 0.04 |  |  | $ | 1.09 |  |  | $ | 2.36 |  |  | $ | 0.48 |  |  | $ | 3.97 |
Net income attributable to common shareholders — Diluted | 0.04 |  |  | 1.08 |  |  | 2.35 |  |  | 0.47 |  |  | 3.95 |
ARIZONA PUBLIC SERVICE COMPANY |
Selected Quarterly Financial Information [Line Items] |
Schedule of quarterly financial information | APS's quarterly financial information for 2017 and 2016 is as follows (dollars in thousands):
| 2017 Quarter Ended, |  | 2017
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 676,869 |  |  | $ | 942,615 |  |  | $ | 1,178,106 |  |  | $ | 756,549 |  |  | $ | 3,554,139 |
Operations and maintenance | 212,218 |  |  | 208,286 |  |  | 215,264 |  |  | 255,361 |  |  | 891,129 |
Operating income | 65,468 |  |  | 212,790 |  |  | 322,053 |  |  | 79,258 |  |  | 679,569 |
Net income attributable to common shareholder | 23,162 |  |  | 169,108 |  |  | 284,256 |  |  | 27,783 |  |  | 504,309 |
| 2016 Quarter Ended, |  | 2016
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 676,632 |  |  | $ | 909,757 |  |  | $ | 1,166,359 |  |  | $ | 737,006 |  |  | $ | 3,489,754 |
Operations and maintenance | 238,711 |  |  | 233,712 |  |  | 209,366 |  |  | 197,319 |  |  | 879,108 |
Operating income | 48,930 |  |  | 165,684 |  |  | 307,601 |  |  | 95,765 |  |  | 617,980 |
Net income attributable to common shareholder | 7,253 |  |  | 127,188 |  |  | 269,220 |  |  | 58,480 |  |  | 462,141 |

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