CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 13,892,000	$ 8,881,000
Customer and other receivables	305,147,000	250,491,000
Accrued unbilled revenues	112,434,000	107,949,000
Allowance for doubtful accounts	(2,513,000)	(3,037,000)
Materials and supplies (at average cost)	264,012,000	253,979,000
Fossil fuel (at average cost)	25,258,000	28,608,000
Income tax receivable (Note 4)	0	3,751,000
Assets from risk management activities (Note 16)	1,931,000	19,694,000
Deferred fuel and purchased power regulatory asset (Note 3)	75,637,000	12,465,000
Other regulatory assets (Note 3)	172,451,000	94,410,000
Other current assets	48,039,000	45,028,000
Total current assets	1,016,288,000	822,219,000
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 16)	51,000	1,000
Nuclear decommissioning trust (Notes 13 and 19)	871,000,000	779,586,000
Other assets	84,531,000	69,063,000
Total investments and other assets	955,582,000	848,650,000
PROPERTY, PLANT AND EQUIPMENT (Notes 1, 6 and 9)
Plant in service and held for future use	17,798,061,000	17,341,888,000
Accumulated depreciation and amortization	(6,128,535,000)	(5,970,100,000)
Net	11,669,526,000	11,371,788,000
Construction work in progress	1,291,498,000	1,019,947,000
Palo Verde sale leaseback, net of accumulated depreciation of $241,405 and $237,535 (Note 18)	109,645,000	113,515,000
Intangible assets, net of accumulated amortization of $582,272 and $603,637	257,189,000	90,022,000
Nuclear fuel, net of accumulated amortization of $144,070 and $147,202	117,408,000	119,004,000
Total property, plant and equipment	13,445,266,000	12,714,276,000
DEFERRED DEBITS
Regulatory assets (Notes 1, 3 and 4)	1,202,302,000	1,313,428,000
Assets for other postretirement benefits (Note 7)	268,978,000	166,206,000
Other	130,666,000	139,474,000
Total deferred debits	1,601,946,000	1,619,108,000
Total Assets	17,019,082,000	16,004,253,000
CURRENT LIABILITIES
Accounts payable	256,442,000	264,631,000
Accrued taxes (Note 4)	148,946,000	138,964,000
Accrued interest	56,397,000	52,835,000
Common dividends payable	77,667,000	72,926,000
Short-term borrowings (Note 5)	95,400,000	177,200,000
Current maturities of long-term debt (Note 6)	82,000,000	125,000,000
Customer deposits	70,388,000	82,520,000
Liabilities from risk management activities (Note 16)	59,252,000	25,836,000
Liabilities for asset retirements (Note 11)	4,745,000	9,135,000
Regulatory liabilities (Note 3)	100,086,000	99,899,000
Other current liabilities	246,529,000	244,000,000
Total current liabilities	1,197,852,000	1,292,946,000
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 6)	4,789,713,000	4,021,785,000
DEFERRED CREDITS AND OTHER
Deferred income taxes (Note 4)	1,690,805,000	2,945,232,000
Regulatory liabilities (Notes 1, 3, 4 and 7)	2,452,536,000	948,916,000
Liabilities for asset retirements (Note 11)	674,784,000	615,340,000
Liabilities for pension benefits (Note 7)	327,300,000	509,310,000
Liabilities from risk management activities (Note 16)	37,170,000	47,238,000
Customer advances	113,996,000	88,672,000
Coal mine reclamation	231,597,000	221,910,000
Deferred investment tax credit	205,575,000	210,162,000
Unrecognized tax benefits (Note 4)	13,115,000	10,046,000
Other	148,909,000	156,784,000
Total deferred credits and other	5,895,787,000	5,753,610,000
COMMITMENTS AND CONTINGENCIES (SEE NOTES)
EQUITY
Common stock, no par value; authorized 150,000,000 shares, 111,816,170 and 111,392,053 issued at respective dates	2,614,805,000	2,596,030,000
Treasury stock at cost; 64,463 shares at end of 2017 and 55,317 shares at end of 2016	(5,624,000)	(4,133,000)
Total common stock	2,609,181,000	2,591,897,000
Retained earnings	2,442,511,000	2,255,547,000
Accumulated other comprehensive loss	(45,002,000)	(43,822,000)
Total shareholders’ equity	5,006,690,000	4,803,622,000
Noncontrolling interests (Note 18)	129,040,000	132,290,000
Total equity	5,135,730,000	4,935,912,000
Total Liabilities and Equity	17,019,082,000	16,004,253,000
ARIZONA PUBLIC SERVICE COMPANY
CURRENT ASSETS
Cash and cash equivalents	13,851,000	8,840,000
Customer and other receivables	292,791,000	262,611,000
Accrued unbilled revenues	112,434,000	107,949,000
Allowance for doubtful accounts	(2,513,000)	(3,037,000)
Materials and supplies (at average cost)	262,630,000	252,777,000
Fossil fuel (at average cost)	25,258,000	28,608,000
Income tax receivable (Note 4)	0	11,174,000
Assets from risk management activities (Note 16)	1,931,000	19,694,000
Deferred fuel and purchased power regulatory asset (Note 3)	75,637,000	12,465,000
Other regulatory assets (Note 3)	172,451,000	94,410,000
Other current assets	41,055,000	41,849,000
Total current assets	995,525,000	837,340,000
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 16)	51,000	1,000
Nuclear decommissioning trust (Notes 13 and 19)	871,000,000	779,586,000
Other assets	67,103,000	48,320,000
Total investments and other assets	938,154,000	827,907,000
PROPERTY, PLANT AND EQUIPMENT (Notes 1, 6 and 9)
Plant in service and held for future use	17,654,078,000	17,228,787,000
Accumulated depreciation and amortization	(6,041,965,000)	(5,881,941,000)
Net	11,612,113,000	11,346,846,000
Construction work in progress	1,266,636,000	989,497,000
Palo Verde sale leaseback, net of accumulated depreciation of $241,405 and $237,535 (Note 18)	109,645,000	113,515,000
Intangible assets, net of accumulated amortization of $582,272 and $603,637	257,028,000	89,868,000
Nuclear fuel, net of accumulated amortization of $144,070 and $147,202	117,408,000	119,004,000
Total property, plant and equipment	13,362,830,000	12,658,730,000
DEFERRED DEBITS
Regulatory assets (Notes 1, 3 and 4)	1,202,302,000	1,313,428,000
Assets for other postretirement benefits (Note 7)	265,139,000	162,911,000
Other	129,801,000	130,859,000
Total deferred debits	1,597,242,000	1,607,198,000
Total Assets	16,893,751,000	15,931,175,000
CURRENT LIABILITIES
Accounts payable	247,852,000	259,161,000
Accrued taxes (Note 4)	157,349,000	130,576,000
Accrued interest	55,533,000	52,525,000
Common dividends payable	77,700,000	72,900,000
Short-term borrowings (Note 5)	0	135,500,000
Current maturities of long-term debt (Note 6)	82,000,000	0
Customer deposits	70,388,000	82,520,000
Liabilities from risk management activities (Note 16)	59,252,000	25,836,000
Liabilities for asset retirements (Note 11)	4,192,000	8,703,000
Regulatory liabilities (Note 3)	100,086,000	99,899,000
Other current liabilities	243,922,000	226,417,000
Total current liabilities	1,098,274,000	1,094,037,000
DEFERRED CREDITS AND OTHER
Deferred income taxes (Note 4)	1,742,485,000	2,999,295,000
Regulatory liabilities (Notes 1, 3, 4 and 7)	2,452,536,000	948,916,000
Liabilities for asset retirements (Note 11)	666,527,000	607,234,000
Liabilities for pension benefits (Note 7)	306,542,000	488,253,000
Liabilities from risk management activities (Note 16)	37,170,000	47,238,000
Customer advances	113,996,000	88,672,000
Coal mine reclamation	215,830,000	206,645,000
Deferred investment tax credit	205,575,000	210,162,000
Unrecognized tax benefits (Note 4)	43,876,000	37,408,000
Other	133,779,000	143,560,000
Total deferred credits and other	5,918,316,000	5,777,383,000
COMMITMENTS AND CONTINGENCIES (SEE NOTES)
EQUITY
Total common stock	178,162,000	178,162,000
Additional paid-in capital	2,571,696,000	2,421,696,000
Retained earnings	2,533,954,000	2,331,245,000
Accumulated other comprehensive loss	(26,983,000)	(25,423,000)
Total shareholders’ equity	5,256,829,000	4,905,680,000
Noncontrolling interests (Note 18)	129,040,000	132,290,000
Total equity	5,385,869,000	5,037,970,000
Long-term debt less current maturities (Note 6)	4,491,292,000	4,021,785,000
Total capitalization	9,877,161,000	9,059,755,000
Total Liabilities and Equity	$ 16,893,751,000	$ 15,931,175,000