Business Segments (Tables)

6 Months Ended

Jun. 30, 2025

Segment Reporting [Abstract]

Schedule of Reportable Segment’s Revenues, Significant Expenses, Net Income, and Assets

The following table reconciles our reportable segment’s revenues, significant expenses, and net income (loss) to the Pinnacle West Consolidated amounts (dollars in millions):

	Three Months Ended June 30,
	2025						2024
	Regulated Electricity Segment		Other		Pinnacle West Consolidated		Regulated Electricity Segment		Other		Pinnacle West Consolidated
Operating revenues	$	1,359	$	—	$	1,359	$	1,309	$	—	$	1,309
Fuel and purchased power	(477)		—		(477)		(437)		—		(437)
Operations and maintenance	(285)		(2)		(287)		(273)		1		(272)
Depreciation and amortization	(229)		—		(229)		(225)		—		(225)
Taxes other than income taxes	(58)		—		(58)		(59)		—		(59)
Pension and other postretirement non-service credits, net	4		—		4		13		—		13
Allowance for equity funds used during construction	15		—		15		9		—		9
Other income and expenses, net	(2)		9		7		—		—		—
Interest charges	(80)		(22)		(102)		(82)		(16)		(98)
Income taxes	(39)		4		(35)		(39)		7		(32)
Less: Net income attributable to noncontrolling interests	(4)		—		(4)		(4)		—		(4)
Net Income (Loss)	$	204	$	(11)	$	193	$	212	$	(8)	$	204

	Six Months Ended June 30,
	2025						2024
	Regulated Electricity Segment		Other		Pinnacle West Consolidated		Regulated Electricity Segment		Other		Pinnacle West Consolidated
Operating revenues	$	2,391	$	—	$	2,391	$	2,261	$	—	$	2,261
Fuel and purchased power	(857)		—		(857)		(795)		—		(795)
Operations and maintenance	(582)		(5)		(587)		(526)		(4)		(530)
Depreciation and amortization	(464)		—		(464)		(435)		—		(435)
Taxes other than income taxes	(117)		—		(117)		(118)		—		(118)
Pension and other postretirement non-service credits, net	7		—		7		25		(1)		24
Allowance for equity funds used during construction	28		—		28		19		—		19
Other income and expenses, net	2		20		22		3		21		24
Interest charges	(159)		(38)		(197)		(156)		(28)		(184)
Income taxes	(36)		7		(29)		(42)		6		(36)
Less: Net income attributable to noncontrolling interests	(9)		—		(9)		(9)		—		(9)
Net Income (Loss)	$	204	$	(16)	$	188	$	227	$	(6)	$	221

The following table reconciles our reportable segment's assets to the Pinnacle West Consolidated amount (dollars in millions):

	June 30, 2025						December 31, 2024
	Regulated Electricity Segment		Other		Pinnacle West Consolidated		Regulated Electricity Segment		Other		Pinnacle West Consolidated
Total Assets	$	29,083	$	152	$	29,235	$	25,988	$	115	$	26,103