CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 59,968	$ 10,283
Customer and other receivables	313,576	266,426
Accrued unbilled revenues	132,197	128,165
Allowance for doubtful accounts	(19,782)	(8,171)
Materials and supplies (at average cost)	314,745	331,091
Fossil fuel (at average cost)	19,552	14,829
Income tax receivable (Note 5)	6,792	21,727
Assets from risk management activities (Note 16)	2,931	515
Deferred fuel and purchased power regulatory asset (Note 4)	175,835	70,137
Other regulatory assets (Note 4)	115,878	133,070
Other current assets	76,627	61,958
Total current assets	1,198,319	1,030,030
INVESTMENTS AND OTHER ASSETS
Nuclear decommissioning trust (Notes 13 and 19)	1,138,435	1,010,775
Other special use funds (Notes 13 and 19)	254,509	245,095
Other assets	92,922	96,953
Total investments and other assets	1,485,866	1,352,823
PROPERTY, PLANT AND EQUIPMENT (Notes 1, 7 and 10)
Plant in service and held for future use	20,837,885	19,836,292
Accumulated depreciation and amortization	(7,110,310)	(6,637,857)
Net	13,727,575	13,198,435
Construction work in progress	937,384	808,133
Palo Verde sale leaseback, net of accumulated depreciation	98,036	101,906
Intangible assets, net of accumulated amortization	282,570	290,564
Nuclear fuel, net of accumulated amortization	113,645	123,500
Total property, plant and equipment	15,159,210	14,522,538
DEFERRED DEBITS
Regulatory assets (Notes 1, 4 and 5)	1,133,987	1,304,073
Operating lease right-of-use assets (Note 9)	505,064	145,813
Assets for pension and other postretirement benefits (Note 8)	502,992	90,570
Other	34,983	33,400
Total deferred debits	2,177,026	1,573,856
Total Assets	20,020,421	18,479,247
CURRENT LIABILITIES
Accounts payable	318,585	346,448
Accrued taxes	159,551	144,899
Accrued interest	56,962	53,534
Common dividends payable	93,531	87,982
Short-term borrowings (Note 6)	169,000	114,675
Current maturities of long-term debt (Note 7)	0	800,000
Customer deposits	48,340	64,908
Liabilities from risk management activities (Note 16)	7,557	38,946
Liabilities for asset retirements (Note 12)	15,586	11,025
Operating lease liabilities (Note 9)	74,785	12,713
Regulatory liabilities (Note 4)	229,088	234,912
Other current liabilities	187,448	168,323
Total current liabilities	1,360,433	2,078,365
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 7)	6,314,266	4,832,558
DEFERRED CREDITS AND OTHER
Deferred income taxes (Note 5)	2,135,403	1,992,339
Regulatory liabilities (Notes 1, 4, 5 and 8)	2,450,169	2,267,835
Liabilities for asset retirements (Note 12)	689,497	646,193
Liabilities for pension benefits (Note 8)	166,484	280,185
Liabilities from risk management activities (Note 16)	11,062	33,186
Customer advances	221,032	215,330
Coal mine reclamation	170,097	165,695
Deferred investment tax credit	191,372	196,468
Unrecognized tax benefits (Note 5)	5,834	6,189
Operating lease liabilities (Note 9)	361,336	51,872
Other	190,643	159,844
Total deferred credits and other	6,592,929	6,015,136
COMMITMENTS AND CONTINGENCIES (SEE NOTES)
EQUITY
Common stock, no par value; authorized 150,000,000 shares, 112,760,051 and 112,540,126 issued at respective dates	2,677,482	2,659,561
Treasury stock at cost; 72,006 shares at end of 2020 and 103,546 shares at end of 2019	(6,289)	(9,427)
Total common stock	2,671,193	2,650,134
Retained earnings	3,025,106	2,837,610
Accumulated other comprehensive loss	(62,796)	(57,096)
Total shareholders’ equity	5,633,503	5,430,648
Noncontrolling interests (Note 18)	119,290	122,540
Total equity	5,752,793	5,553,188
Total Liabilities and Equity	20,020,421	18,479,247
ARIZONA PUBLIC SERVICE COMPANY
CURRENT ASSETS
Cash and cash equivalents	57,310	10,169
Customer and other receivables	312,644	255,479
Accrued unbilled revenues	132,197	128,165
Allowance for doubtful accounts	(19,782)	(8,171)
Materials and supplies (at average cost)	314,745	331,091
Fossil fuel (at average cost)	19,552	14,829
Income tax receivable (Note 5)	0	7,313
Assets from risk management activities (Note 16)	2,931	515
Deferred fuel and purchased power regulatory asset (Note 4)	175,835	70,137
Other regulatory assets (Note 4)	115,878	133,070
Other current assets	47,593	38,895
Total current assets	1,158,903	981,492
INVESTMENTS AND OTHER ASSETS
Nuclear decommissioning trust (Notes 13 and 19)	1,138,435	1,010,775
Other special use funds (Notes 13 and 19)	254,509	245,095
Other assets	46,010	43,781
Total investments and other assets	1,438,954	1,299,651
PROPERTY, PLANT AND EQUIPMENT (Notes 1, 7 and 10)
Plant in service and held for future use	20,834,424	19,832,805
Accumulated depreciation and amortization	(7,107,058)	(6,634,597)
Net	13,727,366	13,198,208
Construction work in progress	937,384	808,133
Palo Verde sale leaseback, net of accumulated depreciation	98,036	101,906
Intangible assets, net of accumulated amortization	282,415	290,409
Nuclear fuel, net of accumulated amortization	113,645	123,500
Total property, plant and equipment	15,158,846	14,522,156
DEFERRED DEBITS
Regulatory assets (Notes 1, 4 and 5)	1,133,987	1,304,073
Operating lease right-of-use assets (Note 9)	503,475	144,024
Assets for pension and other postretirement benefits (Note 8)	495,673	86,736
Other	34,413	32,591
Total deferred debits	2,167,548	1,567,424
Total Assets	19,924,251	18,370,723
CURRENT LIABILITIES
Accounts payable	311,699	338,006
Accrued taxes	148,970	136,328
Accrued interest	56,322	52,619
Common dividends payable	93,500	88,000
Current maturities of long-term debt (Note 7)	0	350,000
Customer deposits	48,340	64,908
Liabilities from risk management activities (Note 16)	7,557	38,946
Liabilities for asset retirements (Note 12)	15,586	11,025
Operating lease liabilities (Note 9)	74,695	12,549
Regulatory liabilities (Note 4)	229,088	234,912
Other current liabilities	190,420	164,736
Total current liabilities	1,176,177	1,492,029
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 7)	5,817,945	4,833,133
DEFERRED CREDITS AND OTHER
Deferred income taxes (Note 5)	2,143,673	2,033,096
Regulatory liabilities (Notes 1, 4, 5 and 8)	2,450,169	2,267,835
Liabilities for asset retirements (Note 12)	689,497	646,193
Liabilities for pension benefits (Note 8)	148,943	262,243
Liabilities from risk management activities (Note 16)	11,062	33,186
Customer advances	221,032	215,330
Coal mine reclamation	170,097	165,695
Deferred investment tax credit	191,372	196,468
Unrecognized tax benefits (Note 5)	39,410	40,188
Operating lease liabilities (Note 9)	359,653	50,092
Other	160,036	136,432
Total deferred credits and other	6,584,944	6,046,758
COMMITMENTS AND CONTINGENCIES (SEE NOTES)
EQUITY
Common stock	178,162	178,162
Additional paid-in capital	2,871,696	2,721,696
Retained earnings	3,216,955	3,011,927
Accumulated other comprehensive loss	(40,918)	(35,522)
Total shareholders’ equity	6,225,895	5,876,263
Noncontrolling interests (Note 18)	119,290	122,540
Total equity	6,345,185	5,998,803
Total capitalization	12,163,130	10,831,936
Total Liabilities and Equity	$ 19,924,251	$ 18,370,723