CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 4,953	$ 8,881
Customer and other receivables	293,266	250,491
Accrued unbilled revenues	213,703	107,949
Allowance for doubtful accounts	(2,151)	(3,037)
Materials and supplies (at average cost)	258,134	253,979
Fossil fuel (at average cost)	29,890	28,608
Income tax receivable	4,073	3,751
Assets from risk management activities (Note 6)	307	19,694
Deferred fuel and purchased power regulatory asset (Note 3)	48,122	12,465
Other regulatory assets (Note 3)	172,606	94,410
Other current assets	45,301	45,028
Total current assets	1,068,204	822,219
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 6)	55	1
Nuclear decommissioning trust (Note 11)	822,244	779,586
Other assets	71,121	69,063
Total investments and other assets	893,420	848,650
PROPERTY, PLANT AND EQUIPMENT
Plant in service and held for future use	17,227,444	17,341,888
Accumulated depreciation and amortization	(5,951,653)	(5,970,100)
Net	11,275,791	11,371,788
Construction work in progress	1,195,076	1,019,947
Palo Verde sale leaseback, net of accumulated depreciation (Note 5)	111,580	113,515
Intangible assets, net of accumulated amortization	265,926	90,022
Nuclear fuel, net of accumulated amortization	118,909	119,004
Total property, plant and equipment	12,967,282	12,714,276
DEFERRED DEBITS
Regulatory assets (Note 3)	1,415,091	1,313,428
Assets for other postretirement benefits (Note 4)	184,629	166,206
Other	141,101	139,474
Total deferred debits	1,740,821	1,619,108
TOTAL ASSETS	16,669,727	16,004,253
CURRENT LIABILITIES
Accounts payable	270,262	264,631
Accrued taxes	150,709	138,964
Accrued interest	53,046	52,835
Common dividends payable	73,113	72,926
Short-term borrowings (Note 2)	482,000	177,200
Current maturities of long-term debt (Note 2)	207,000	125,000
Customer deposits	72,585	82,520
Liabilities from risk management activities (Note 6)	48,613	25,836
Liabilities for asset retirements	8,960	9,135
Regulatory liabilities (Note 3)	91,173	99,899
Other current liabilities	181,133	244,000
Total current liabilities	1,638,594	1,292,946
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 2)	4,192,520	4,021,785
DEFERRED CREDITS AND OTHER
Deferred income taxes	3,048,007	2,945,232
Regulatory liabilities (Note 3)	940,106	948,916
Liabilities for asset retirements	631,657	615,340
Liabilities for pension benefits (Note 4)	460,368	509,310
Liabilities from risk management activities (Note 6)	46,586	47,238
Customer advances	98,795	88,672
Coal mine reclamation	236,811	221,910
Deferred investment tax credit	206,969	210,162
Unrecognized tax benefits	10,307	10,046
Other	168,930	156,784
Total deferred credits and other	5,848,536	5,753,610
COMMITMENTS AND CONTINGENCIES (SEE NOTE 7)
EQUITY
Common stock, no par value; authorized 150,000,000 shares, 111,642,680 and 111,392,053 issued at respective dates	2,604,482	2,596,030
Treasury stock at cost; 19,298 and 55,317 shares at respective dates	(1,553)	(4,133)
Total common stock	2,602,929	2,591,897
Retained earnings	2,300,109	2,255,547
Accumulated other comprehensive loss:
Pension and other postretirement benefits	(39,882)	(39,070)
Derivative instruments	(3,744)	(4,752)
Total accumulated other comprehensive loss	(43,626)	(43,822)
Total shareholders’ equity	4,859,412	4,803,622
Noncontrolling interests (Note 5)	130,665	132,290
Total equity	4,990,077	4,935,912
TOTAL LIABILITIES AND EQUITY	16,669,727	16,004,253
Arizona Public Service Company
CURRENT ASSETS
Cash and cash equivalents	4,851	8,840
Customer and other receivables	285,482	262,611
Accrued unbilled revenues	213,703	107,949
Allowance for doubtful accounts	(2,151)	(3,037)
Materials and supplies (at average cost)	256,828	252,777
Fossil fuel (at average cost)	29,890	28,608
Income tax receivable	0	11,174
Assets from risk management activities (Note 6)	307	19,694
Deferred fuel and purchased power regulatory asset (Note 3)	48,122	12,465
Other regulatory assets (Note 3)	172,606	94,410
Other current assets	38,743	41,849
Total current assets	1,048,381	837,340
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 6)	55	1
Nuclear decommissioning trust (Note 11)	822,244	779,586
Other assets	49,798	48,320
Total investments and other assets	872,097	827,907
PROPERTY, PLANT AND EQUIPMENT
Plant in service and held for future use	17,112,413	17,228,787
Accumulated depreciation and amortization	(5,865,446)	(5,881,941)
Net	11,246,967	11,346,846
Construction work in progress	1,157,017	989,497
Palo Verde sale leaseback, net of accumulated depreciation (Note 5)	111,580	113,515
Intangible assets, net of accumulated amortization	265,764	89,868
Nuclear fuel, net of accumulated amortization	118,909	119,004
Total property, plant and equipment	12,900,237	12,658,730
DEFERRED DEBITS
Regulatory assets (Note 3)	1,415,091	1,313,428
Assets for other postretirement benefits (Note 4)	181,237	162,911
Other	129,423	130,859
Total deferred debits	1,725,751	1,607,198
TOTAL ASSETS	16,546,466	15,931,175
CURRENT LIABILITIES
Accounts payable	265,291	259,161
Accrued taxes	147,335	130,576
Accrued interest	52,752	52,525
Common dividends payable	73,100	72,900
Short-term borrowings (Note 2)	385,700	135,500
Current maturities of long-term debt (Note 2)	82,000	0
Customer deposits	72,585	82,520
Liabilities from risk management activities (Note 6)	48,613	25,836
Liabilities for asset retirements	8,499	8,703
Regulatory liabilities (Note 3)	91,173	99,899
Other current liabilities	180,095	226,417
Total current liabilities	1,407,143	1,094,037
DEFERRED CREDITS AND OTHER
Deferred income taxes	3,095,019	2,999,295
Regulatory liabilities (Note 3)	940,106	948,916
Liabilities for asset retirements	623,437	607,234
Liabilities for pension benefits (Note 4)	440,016	488,253
Liabilities from risk management activities (Note 6)	46,586	47,238
Customer advances	98,795	88,672
Coal mine reclamation	221,295	206,645
Deferred investment tax credit	206,969	210,162
Unrecognized tax benefits	37,669	37,408
Other	154,185	143,560
Total deferred credits and other	5,864,077	5,777,383
COMMITMENTS AND CONTINGENCIES (SEE NOTE 7)
EQUITY
Total common stock	178,162	178,162
Additional paid-in capital	2,421,696	2,421,696
Retained earnings	2,377,315	2,331,245
Accumulated other comprehensive loss:
Pension and other postretirement benefits	(21,368)	(20,671)
Derivative instruments	(3,744)	(4,752)
Total accumulated other comprehensive loss	(25,112)	(25,423)
Total shareholders’ equity	4,952,061	4,905,680
Noncontrolling interests (Note 5)	130,665	132,290
Total equity	5,082,726	5,037,970
Long-term debt less current maturities (Note 2)	4,192,520	4,021,785
Total capitalization	9,275,246	9,059,755
TOTAL LIABILITIES AND EQUITY	$ 16,546,466	$ 15,931,175