Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2017

Selected Quarterly Financial Information [Line Items]

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited)

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]

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited) - APS

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