CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 48,267	$ 39,488
Customer and other receivables	325,029	274,691
Accrued unbilled revenues	150,531	96,240
Allowance for doubtful accounts	(3,608)	(3,125)
Materials and supplies (at average cost)	250,789	234,234
Fossil fuel (at average cost)	34,745	45,697
Income tax receivable	0	589
Assets from risk management activities (Note 6)	6,235	15,905
Deferred fuel and purchased power regulatory asset (Note 3)	8,132	0
Other regulatory assets (Note 3)	114,088	149,555
Other current assets	43,284	37,242
Total current assets	977,492	890,516
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 6)	0	12,106
Nuclear decommissioning trust (Note 11)	779,753	735,196
Other assets	68,977	52,518
Total investments and other assets	848,730	799,820
PROPERTY, PLANT AND EQUIPMENT
Plant in service and held for future use	16,877,695	16,222,232
Accumulated depreciation and amortization	(5,895,765)	(5,594,094)
Net	10,981,930	10,628,138
Construction work in progress	1,118,666	816,307
Palo Verde sale leaseback, net of accumulated depreciation (Note 5)	114,483	117,385
Intangible assets, net of accumulated amortization	96,789	123,975
Nuclear fuel, net of accumulated amortization	133,731	123,139
Total property, plant and equipment	12,445,599	11,808,944
DEFERRED DEBITS
Regulatory assets (Note 3)	1,212,150	1,214,146
Assets for other postretirement benefits (Note 4)	191,007	185,997
Other	130,748	128,835
Total deferred debits	1,533,905	1,528,978
TOTAL ASSETS	15,805,726	15,028,258
CURRENT LIABILITIES
Accounts payable	248,133	297,480
Accrued taxes	219,432	138,600
Accrued interest	46,124	56,305
Common dividends payable	0	69,363
Short-term borrowings (Note 2)	117,300	0
Current maturities of long-term debt (Note 2)	16,870	357,580
Customer deposits	78,262	73,073
Liabilities from risk management activities (Note 6)	45,175	77,716
Liabilities for asset retirements (Note 14)	11,852	28,573
Deferred fuel and purchased power regulatory liability (Note 3)	0	9,688
Other regulatory liabilities (Note 3)	104,313	136,078
Other current liabilities	222,257	197,861
Total current liabilities	1,109,718	1,442,317
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 2)	4,145,366	3,462,391
DEFERRED CREDITS AND OTHER
Deferred income taxes	2,941,559	2,723,425
Regulatory liabilities (Note 3)	998,349	994,152
Liabilities for asset retirements (Note 14)	458,628	415,003
Liabilities for pension benefits (Note 4)	401,680	480,998
Liabilities from risk management activities (Note 6)	58,343	89,973
Customer advances	98,779	115,609
Coal mine reclamation	220,269	201,984
Deferred investment tax credit	180,738	187,080
Unrecognized tax benefits	9,904	9,524
Other	190,258	186,345
Total deferred credits and other	5,558,507	5,404,093
COMMITMENTS AND CONTINGENCIES (SEE NOTE 7)
EQUITY
Common stock, no par value; authorized 150,000,000 shares, 111,220,370 and 111,095,402 issued at respective dates	2,552,979	2,541,668
Treasury stock at cost; 1,900 and 115,030 shares at respective dates	(130)	(5,806)
Total common stock	2,552,849	2,535,862
Retained earnings	2,342,643	2,092,803
Accumulated other comprehensive loss:
Pension and other postretirement benefits	(36,960)	(37,593)
Derivative instruments	(5,186)	(7,155)
Total accumulated other comprehensive loss	(42,146)	(44,748)
Total shareholders’ equity	4,853,346	4,583,917
Noncontrolling interests (Note 5)	138,789	135,540
Total equity	4,992,135	4,719,457
TOTAL LIABILITIES AND EQUITY	15,805,726	15,028,258
Arizona Public Service Company
CURRENT ASSETS
Cash and cash equivalents	8,027	22,056
Customer and other receivables	323,036	274,428
Accrued unbilled revenues	150,531	96,240
Allowance for doubtful accounts	(3,608)	(3,125)
Materials and supplies (at average cost)	249,554	234,234
Fossil fuel (at average cost)	34,745	45,697
Assets from risk management activities (Note 6)	6,235	15,905
Deferred fuel and purchased power regulatory asset (Note 3)	8,132	0
Other regulatory assets (Note 3)	114,088	149,555
Other current assets	39,981	35,765
Total current assets	930,721	870,755
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 6)	0	12,106
Nuclear decommissioning trust (Note 11)	779,753	735,196
Other assets	48,471	34,455
Total investments and other assets	828,224	781,757
PROPERTY, PLANT AND EQUIPMENT
Plant in service and held for future use	16,764,278	16,218,724
Accumulated depreciation and amortization	(5,808,259)	(5,590,937)
Net	10,956,019	10,627,787
Construction work in progress	1,092,895	812,845
Palo Verde sale leaseback, net of accumulated depreciation (Note 5)	114,483	117,385
Intangible assets, net of accumulated amortization	96,634	123,820
Nuclear fuel, net of accumulated amortization	133,731	123,139
Total property, plant and equipment	12,393,762	11,804,976
DEFERRED DEBITS
Regulatory assets (Note 3)	1,212,150	1,214,146
Assets for other postretirement benefits (Note 4)	187,616	182,625
Other	125,863	127,923
Total deferred debits	1,525,629	1,524,694
TOTAL ASSETS	15,678,336	14,982,182
CURRENT LIABILITIES
Accounts payable	241,495	291,574
Accrued taxes	252,443	144,488
Accrued interest	45,762	56,003
Common dividends payable	0	69,400
Short-term borrowings (Note 2)	83,300	0
Current maturities of long-term debt (Note 2)	16,870	357,580
Customer deposits	78,262	73,073
Liabilities from risk management activities (Note 6)	45,175	77,716
Liabilities for asset retirements (Note 14)	11,505	28,573
Deferred fuel and purchased power regulatory liability (Note 3)	0	9,688
Other regulatory liabilities (Note 3)	104,313	136,078
Other current liabilities	186,402	180,535
Total current liabilities	1,065,527	1,424,708
DEFERRED CREDITS AND OTHER
Deferred income taxes	2,957,021	2,764,489
Regulatory liabilities (Note 3)	998,349	994,152
Liabilities for asset retirements (Note 14)	450,508	415,003
Liabilities for pension benefits (Note 4)	380,640	459,065
Liabilities from risk management activities (Note 6)	58,343	89,973
Customer advances	98,779	115,609
Coal mine reclamation	205,126	201,984
Deferred investment tax credit	180,738	187,080
Unrecognized tax benefits	37,266	35,251
Other	140,233	142,683
Total deferred credits and other	5,507,003	5,405,289
COMMITMENTS AND CONTINGENCIES (SEE NOTE 7)
EQUITY
Total common stock	178,162	178,162
Additional paid-in capital	2,379,696	2,379,696
Retained earnings	2,413,153	2,148,493
Accumulated other comprehensive loss:
Pension and other postretirement benefits	(19,174)	(19,942)
Derivative instruments	(5,186)	(7,155)
Total shareholders’ equity	4,946,651	4,679,254
Noncontrolling interests (Note 5)	138,789	135,540
Total equity	5,085,440	4,814,794
Long-term debt less current maturities (Note 2)	4,020,366	3,337,391
Total capitalization	9,105,806	8,152,185
TOTAL LIABILITIES AND EQUITY	$ 15,678,336	$ 14,982,182