Changes in Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2026

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Changes in Accumulated Other Comprehensive Loss

Changes in Accumulated Other Comprehensive Loss

The following table shows the changes in Pinnacle West’s consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands): 

	Pension and Other Postretirement Benefits			Derivative Instruments		Total
Three Months Ended March 31
Balance December 31, 2025	$	(32,980)		$	572	$	(32,408)
Other comprehensive loss before reclassifications	—			(43)		(43)
Amounts reclassified from accumulated other comprehensive loss	502		(a)	—		502
Balance March 31, 2026	$	(32,478)		$	529	$	(31,949)
Balance December 31, 2024	$	(31,661)		$	719	$	(30,942)
Other comprehensive income before reclassifications	—			350		350
Amounts reclassified from accumulated other comprehensive loss	498		(a)	—		498
Balance March 31, 2025	$	(31,163)		$	1,069	$	(30,094)

(a)    These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 8

The following table shows the changes in APS’s accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands): 

	Pension and Other Postretirement Benefits
Three Months Ended March 31
Balance December 31, 2025	$	(15,457)
Other comprehensive loss before reclassifications	—
Amounts reclassified from accumulated other comprehensive loss	410		(a)
Balance March 31, 2026	$	(15,047)
Balance December 31, 2024	$	(14,116)
Other comprehensive loss before reclassifications	—
Amounts reclassified from accumulated other comprehensive loss	406		(a)
Balance March 31, 2025	$	(13,710)

(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 8.