Changes in Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2023

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

Schedule of Changes in Accumulated Other Comprehensive Loss Including Reclassification Adjustments, Net of Tax, by Component

The following tables show 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, 2022	$	(32,332)		$	897	$	(31,435)
OCI (loss) before reclassifications	—			(616)		(616)
Amounts reclassified from accumulated other comprehensive loss	515		(a)	—		515
Balance March 31, 2023	$	(31,817)		$	281	$	(31,536)
Balance December 31, 2021	$	(53,885)		$	(976)	$	(54,861)
OCI (loss) before reclassifications	—			252		252
Amounts reclassified from accumulated other comprehensive loss	901		(a)	—		901
Balance March 31, 2022	$	(52,984)		$	(724)	$	(53,708)

(a)    These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 5.

The following tables show the changes in APS’s consolidated 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, 2022	$	(15,596)
OCI (loss) before reclassifications	—
Amounts reclassified from accumulated other comprehensive loss	457		(a)
Balance March 31, 2023	$	(15,139)
Balance December 31, 2021	$	(34,880)
OCI (loss) before reclassifications	—
Amounts reclassified from accumulated other comprehensive loss	820		(a)
Balance March 31, 2022	$	(34,060)

(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 5.