Schedule I - Condensed Financial Information of Registrant - Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CONDENSED FINANCIAL STATEMENTS
Operating expenses	$ 4,272,309	$ 4,112,852	$ 3,871,351
Other
Total	92,707	101,968	102,376
Interest expense	469,701	425,742	374,887
Income before income taxes	738,369	736,559	595,693
Income tax benefit	106,726	110,529	76,912
Net Income (Loss) Attributable to Common Shareholders	616,531	608,806	501,557
Other comprehensive income (loss) — attributable to common shareholders	(1,466)	2,202	(1,709)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	615,065	611,008	499,848
Pinnacle West Consolidated
CONDENSED FINANCIAL STATEMENTS
Operating expenses	9,667	9,931	11,249
Other
Equity in earnings of subsidiaries	699,155	643,703	539,962
Other income and (expense), net	(1,917)	23,835	2,823
Total	697,238	667,538	542,785
Interest expense	90,233	65,261	47,251
Income before income taxes	597,338	592,346	484,285
Income tax benefit	(19,193)	(16,460)	(17,272)
Net Income (Loss) Attributable to Common Shareholders	616,531	608,806	501,557
Other comprehensive income (loss) — attributable to common shareholders	(1,466)	2,202	(1,709)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 615,065	$ 611,008	$ 499,848