Schedule I - Condensed Financial Information of Registrant - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 3,838	$ 4,955
Accounts receivable	525,608	513,892
Income tax receivable	0	332
Assets held for sale- investment in subsidiaries	0	35,139
Other current assets	74,915	101,417
Total current assets	1,689,404	1,926,967
Investments and other assets
Other assets	115,095	102,845
Total investments and other assets	1,812,277	1,666,872
TOTAL ASSETS	26,102,760	24,661,153
Current liabilities
Accounts payable	485,426	442,455
Accrued taxes	175,863	166,833
Common dividends payable	106,592	99,813
Short-term borrowings	568,450	609,500
Operating lease liabilities	100,367	67,883
Other current liabilities	171,651	193,524
Total current liabilities	2,843,797	2,889,347
Deferred credits and other
Long-term debt less current maturities	8,058,648	7,540,622
Deferred income taxes (Note 4)	2,444,473	2,416,480
Operating lease liabilities	1,520,877	1,210,189
Other	242,320	251,469
Total deferred credits and other	8,342,837	7,946,322
COMMITMENTS AND CONTINGENCIES
Common stock equity
Common stock	3,121,617	2,752,676
Accumulated other comprehensive loss	(30,942)	(33,144)
Retained earnings	3,666,959	3,466,317
Total shareholders’ equity	6,754,311	6,177,664
Noncontrolling interests	103,167	107,198
Total equity	6,857,478	6,284,862	$ 6,159,876	$ 6,021,460
TOTAL LIABILITIES AND EQUITY	26,102,760	24,661,153
Pinnacle West
Current assets
Cash and cash equivalents	23	9
Accounts receivable	163,203	163,829
Income tax receivable	6,673	1,832
Assets held for sale- investment in subsidiaries	0	35,139
Other current assets	434	28,379
Total current assets	170,333	229,188
Investments and other assets
Investments in subsidiaries	8,435,150	7,369,159
Deferred income taxes	0	15,746
Other assets	21,966	22,839
Total investments and other assets	8,457,116	7,407,744
TOTAL ASSETS	8,627,449	7,636,932
Current liabilities
Accounts payable	3,471	8,176
Accrued taxes	4,799	4,543
Common dividends payable	106,592	99,813
Short-term borrowings	228,550	76,650
Current maturities of long-term debt	500,000	625,000
Operating lease liabilities	138	127
Other current liabilities	11,389	11,400
Total current liabilities	854,939	825,709
Deferred credits and other
Long-term debt less current maturities	867,770	498,731
Deferred income taxes (Note 4)	24,536	0
Pension liabilities	4,462	6,487
Operating lease liabilities	1,194	1,332
Other	17,070	19,811
Total deferred credits and other	47,262	27,630
COMMITMENTS AND CONTINGENCIES
Common stock equity
Common stock	3,118,294	2,744,491
Accumulated other comprehensive loss	(30,942)	(33,144)
Retained earnings	3,666,959	3,466,317
Total shareholders’ equity	6,754,311	6,177,664
Noncontrolling interests	103,167	107,198
Total equity	6,857,478	6,284,862
TOTAL LIABILITIES AND EQUITY	$ 8,627,449	$ 7,636,932