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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Selected Quarterly Financial Information [Line Items] |
Schedule of quarterly financial information | Consolidated quarterly financial information for 2018 and 2017 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.
| 2018 Quarter Ended |  | 2018
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 692,714 |  |  | $ | 974,123 |  |  | $ | 1,268,034 |  |  | $ | 756,376 |  |  | $ | 3,691,247 |
Operations and maintenance | 265,682 |  |  | 268,397 |  |  | 246,545 |  |  | 256,120 |  |  | 1,036,744 |
Operating income | 31,334 |  |  | 242,162 |  |  | 433,307 |  |  | 66,884 |  |  | 773,687 |
Income taxes | (1,265 | ) |  | 44,039 |  |  | 84,333 |  |  | 6,795 |  |  | 133,902 |
Net income | 8,094 |  |  | 171,612 |  |  | 319,885 |  |  | 30,949 |  |  | 530,540 |
Net income attributable to common shareholders | 3,221 |  |  | 166,738 |  |  | 315,012 |  |  | 26,076 |  |  | 511,047 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — Basic | $ | 0.03 |  |  | $ | 1.49 |  |  | $ | 2.81 |  |  | $ | 0.23 |  |  | $ | 4.56 |
Net income attributable to common shareholders — Diluted | 0.03 |  |  | 1.48 |  |  | 2.80 |  |  | 0.23 |  |  | 4.54 |
| 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 | 226,071 |  |  | 220,985 |  |  | 230,839 |  |  | 271,212 |  |  | 949,107 |
Operating income | 67,411 |  |  | 297,257 |  |  | 459,548 |  |  | 85,547 |  |  | 909,763 |
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 |
ARIZONA PUBLIC SERVICE COMPANY |
Selected Quarterly Financial Information [Line Items] |
Schedule of quarterly financial information | APS's quarterly financial information for 2018 and 2017 is as follows (dollars in thousands):
| 2018 Quarter Ended |  | 2018
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 692,006 |  |  | $ | 971,963 |  |  | $ | 1,267,997 |  |  | $ | 756,376 |  |  | $ | 3,688,342 |
Operations and maintenance | 254,601 |  |  | 251,999 |  |  | 226,346 |  |  | 236,281 |  |  | 969,227 |
Operating income | 37,878 |  |  | 251,590 |  |  | 453,547 |  |  | 86,753 |  |  | 829,768 |
Net income attributable to common shareholder | 9,599 |  |  | 177,825 |  |  | 338,366 |  |  | 44,475 |  |  | 570,265 |
| 2017 Quarter Ended |  | 2017
| March 31, |  | June 30, |  | September 30, |  | December 31, |  | Total
Operating revenues | $ | 677,589 |  |  | $ | 943,406 |  |  | $ | 1,178,846 |  |  | $ | 757,811 |  |  | $ | 3,557,652 |
Operations and maintenance | 219,008 |  |  | 215,775 |  |  | 222,374 |  |  | 260,826 |  |  | 917,983 |
Operating income | 70,269 |  |  | 296,700 |  |  | 465,658 |  |  | 91,912 |  |  | 924,539 |
Net income attributable to common shareholder | 23,162 |  |  | 169,108 |  |  | 284,256 |  |  | 27,783 |  |  | 504,309 |

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