Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Selected Quarterly Financial Information [Line Items]

Schedule of quarterly financial information

Consolidated quarterly financial information for 2016 and 2015 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.

	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

	2015 Quarter Ended								2015
	March 31,		June 30,		September 30,		December 31,		Total
Operating revenues	$	671,219	$	890,648	$	1,199,146	$	734,430	$	3,495,443
Operations and maintenance	214,944		210,965		220,449		222,019		868,377
Operating income	67,684		231,973		445,111		109,834		854,602
Income taxes	7,947		67,371		139,555		22,847		237,720
Net income	20,727		127,507		261,978		45,978		456,190
Net income attributable to common shareholders	16,122		122,902		257,116		41,117		437,257
Earnings Per Share:
Net income attributable to common shareholders — Basic	$	0.15	$	1.11	$	2.32	$	0.37	$	3.94
Net income attributable to common shareholders — Diluted	0.14		1.10		2.30		0.37		3.92

ARIZONA PUBLIC SERVICE COMPANY

Selected Quarterly Financial Information [Line Items]

Schedule of quarterly financial information

APS's quarterly financial information for 2016 and 2015 is as follows (dollars in thousands):

	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

	2015 Quarter Ended,								2015
	March 31,		June 30,		September 30,		December 31,		Total
Operating revenues	$	670,668	$	889,723	$	1,198,380	$	733,586	$	3,492,357
Operations and maintenance	209,947		208,031		216,011		219,146		853,135
Operating income	61,333		162,704		301,238		86,709		611,984
Net income attributable to common shareholder	19,868		125,362		261,187		43,857		450,274