CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 3,028	$ 8,881
Customer and other receivables	191,175	250,491
Accrued unbilled revenues	101,226	107,949
Allowance for doubtful accounts	(1,946)	(3,037)
Materials and supplies (at average cost)	252,598	253,979
Fossil fuel (at average cost)	30,656	28,608
Income tax receivable	9,531	3,751
Assets from risk management activities (Note 6)	4,222	19,694
Deferred fuel and purchased power regulatory asset (Note 3)	17,625	12,465
Other regulatory assets (Note 3)	138,316	94,410
Other current assets	48,565	45,028
Total current assets	794,996	822,219
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 6)	0	1
Nuclear decommissioning trust (Note 11)	805,048	779,586
Other assets	70,025	69,063
Total investments and other assets	875,073	848,650
PROPERTY, PLANT AND EQUIPMENT
Plant in service and held for future use	17,436,720	17,341,888
Accumulated depreciation and amortization	(6,060,254)	(5,970,100)
Net	11,376,466	11,371,788
Construction work in progress	1,005,797	1,019,947
Palo Verde sale leaseback, net of accumulated depreciation (Note 5)	112,548	113,515
Intangible assets, net of accumulated amortization	251,208	90,022
Nuclear fuel, net of accumulated amortization	135,821	119,004
Total property, plant and equipment	12,881,840	12,714,276
DEFERRED DEBITS
Regulatory assets (Note 3)	1,321,473	1,313,428
Assets for other postretirement benefits (Note 4)	175,414	166,206
Other	144,029	139,474
Total deferred debits	1,640,916	1,619,108
TOTAL ASSETS	16,192,825	16,004,253
CURRENT LIABILITIES
Accounts payable	250,197	264,631
Accrued taxes	182,812	138,964
Accrued interest	48,576	52,835
Common dividends payable	0	72,926
Short-term borrowings (Note 2)	207,297	177,200
Current maturities of long-term debt (Note 2)	125,000	125,000
Customer deposits	76,149	82,520
Liabilities from risk management activities (Note 6)	41,932	25,836
Liabilities for asset retirements	8,627	9,135
Regulatory liabilities (Note 3)	101,208	99,899
Other current liabilities	152,015	244,000
Total current liabilities	1,193,813	1,292,946
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 2)	4,273,890	4,021,785
DEFERRED CREDITS AND OTHER
Deferred income taxes	2,955,441	2,945,232
Regulatory liabilities (Note 3)	948,293	948,916
Liabilities for asset retirements	623,394	615,340
Liabilities for pension benefits (Note 4)	469,746	509,310
Liabilities from risk management activities (Note 6)	63,213	47,238
Customer advances	92,113	88,672
Coal mine reclamation	224,516	221,910
Deferred investment tax credit	209,818	210,162
Unrecognized tax benefits	10,172	10,046
Other	162,476	156,784
Total deferred credits and other	5,759,182	5,753,610
COMMITMENTS AND CONTINGENCIES (SEE NOTE 7)
EQUITY
Common stock, no par value; authorized 150,000,000 shares, 111,587,048 and 111,392,053 issued at respective dates	2,595,042	2,596,030
Treasury stock at cost; 29,195 and 55,317 shares at respective dates	(2,270)	(4,133)
Total common stock	2,592,772	2,591,897
Retained earnings	2,278,867	2,255,547
Accumulated other comprehensive loss:
Pension and other postretirement benefits	(38,548)	(39,070)
Derivative instruments	(4,315)	(4,752)
Total accumulated other comprehensive loss	(42,863)	(43,822)
Total shareholders’ equity	4,828,776	4,803,622
Noncontrolling interests (Note 5)	137,164	132,290
Total equity	4,965,940	4,935,912
TOTAL LIABILITIES AND EQUITY	16,192,825	16,004,253
Arizona Public Service Company
CURRENT ASSETS
Cash and cash equivalents	2,933	8,840
Customer and other receivables	190,898	262,611
Accrued unbilled revenues	101,226	107,949
Allowance for doubtful accounts	(1,946)	(3,037)
Materials and supplies (at average cost)	251,360	252,777
Fossil fuel (at average cost)	30,656	28,608
Income tax receivable	11,195	11,174
Assets from risk management activities (Note 6)	4,222	19,694
Deferred fuel and purchased power regulatory asset (Note 3)	17,625	12,465
Other regulatory assets (Note 3)	138,316	94,410
Other current assets	43,040	41,849
Total current assets	789,525	837,340
INVESTMENTS AND OTHER ASSETS
Assets from risk management activities (Note 6)	0	1
Nuclear decommissioning trust (Note 11)	805,048	779,586
Other assets	49,094	48,320
Total investments and other assets	854,142	827,907
PROPERTY, PLANT AND EQUIPMENT
Plant in service and held for future use	17,324,182	17,228,787
Accumulated depreciation and amortization	(5,974,360)	(5,881,941)
Net	11,349,822	11,346,846
Construction work in progress	970,880	989,497
Palo Verde sale leaseback, net of accumulated depreciation (Note 5)	112,548	113,515
Intangible assets, net of accumulated amortization	251,045	89,868
Nuclear fuel, net of accumulated amortization	135,821	119,004
Total property, plant and equipment	12,820,116	12,658,730
DEFERRED DEBITS
Regulatory assets (Note 3)	1,321,473	1,313,428
Assets for other postretirement benefits (Note 4)	172,071	162,911
Other	130,327	130,859
Total deferred debits	1,623,871	1,607,198
TOTAL ASSETS	16,087,654	15,931,175
CURRENT LIABILITIES
Accounts payable	245,774	259,161
Accrued taxes	178,393	130,576
Accrued interest	48,349	52,525
Common dividends payable	0	72,900
Short-term borrowings (Note 2)	116,497	135,500
Customer deposits	76,149	82,520
Liabilities from risk management activities (Note 6)	41,932	25,836
Liabilities for asset retirements	8,182	8,703
Regulatory liabilities (Note 3)	101,208	99,899
Other current liabilities	149,486	226,417
Total current liabilities	965,970	1,094,037
DEFERRED CREDITS AND OTHER
Deferred income taxes	3,008,075	2,999,295
Regulatory liabilities (Note 3)	948,293	948,916
Liabilities for asset retirements	615,230	607,234
Liabilities for pension benefits (Note 4)	449,222	488,253
Liabilities from risk management activities (Note 6)	63,213	47,238
Customer advances	92,113	88,672
Coal mine reclamation	209,126	206,645
Deferred investment tax credit	209,818	210,162
Unrecognized tax benefits	37,534	37,408
Other	148,118	143,560
Total deferred credits and other	5,780,742	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	2,354,405	2,331,245
Accumulated other comprehensive loss:
Pension and other postretirement benefits	(20,060)	(20,671)
Derivative instruments	(4,315)	(4,752)
Total accumulated other comprehensive loss	(24,375)	(25,423)
Total shareholders’ equity	4,929,888	4,905,680
Noncontrolling interests (Note 5)	137,164	132,290
Total equity	5,067,052	5,037,970
Long-term debt less current maturities (Note 2)	4,273,890	4,021,785
Total capitalization	9,340,942	9,059,755
TOTAL LIABILITIES AND EQUITY	$ 16,087,654	$ 15,931,175