Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Selected Quarterly Financial Information [Line Items]

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited)

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]

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited) - APS

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