Changes in Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2020

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 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 June 30
Balance March 31, 2020	$	(55,317	)		$	(262	)		$	(55,579	)
OCI (loss) before reclassifications	(2,008		)		(1,549		)		(3,557		)
Amounts reclassified from accumulated other comprehensive loss	999			(a)	262			(b)	1,261
Balance June 30, 2020	$	(56,326	)		$	(1,549	)		$	(57,875	)
Balance March 31, 2019	$	(45,118	)		$	(1,383	)		$	(46,501	)
OCI (loss) before reclassifications	(2,422		)		—				(2,422		)
Amounts reclassified from accumulated other comprehensive loss	883			(a)	404			(b)	1,287
Balance June 30, 2019	$	(46,657	)		$	(979	)		$	(47,636	)

	Pension and Other Postretirement Benefits				Derivative Instruments				Total
Six Months Ended June 30
Balance December 31, 2019	$	(56,522	)		$	(574	)		$	(57,096	)
OCI (loss) before reclassifications	(2,008		)		(1,257		)		(3,265		)
Amounts reclassified from accumulated other comprehensive loss	2,204			(a)	282			(b)	2,486
Balance June 30, 2020	$	(56,326	)		$	(1,549	)		$	(57,875	)
Balance December 31, 2018	$	(45,997	)		$	(1,711	)		$	(47,708	)
OCI (loss) before reclassifications	(2,422		)		—				(2,422		)
Amounts reclassified from accumulated other comprehensive loss	1,762			(a)	732			(b)	2,494
Balance June 30, 2019	$	(46,657	)		$	(979	)		$	(47,636	)

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

(b)

These amounts primarily represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA.  See Note 7.

The following table shows the changes in APS's consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component for the three and six months ended June 30, 2020 and 2019 (dollars in thousands): 

	Pension and Other Postretirement Benefits				Derivative Instruments				Total
Three Months Ended June 30
Balance March 31, 2020	$	(33,935	)		$	(262	)		$	(34,197	)
OCI (loss) before reclassifications	(1,951		)		—				(1,951		)
Amounts reclassified from accumulated other comprehensive loss	861			(a)	262			(b)	1,123
Balance June 30, 2020	$	(35,025	)		$	—			$	(35,025	)
Balance March 31, 2019	$	(24,644	)		$	(1,383	)		$	(26,027	)
OCI (loss) before reclassifications	(2,414		)		—				(2,414		)
Amounts reclassified from accumulated other comprehensive loss	761			(a)	404			(b)	1,165
Balance June 30, 2019	$	(26,297	)		$	(979	)		$	(27,276	)

	Pension and Other Postretirement Benefits				Derivative Instruments				Total
Six Months Ended June 30
Balance December 31, 2019	$	(34,948	)		$	(574	)		$	(35,522	)
OCI (loss) before reclassifications	(1,951		)		292				(1,659		)
Amounts reclassified from accumulated other comprehensive loss	1,874			(a)	282			(b)	2,156
Balance June 30, 2020	$	(35,025	)		$	—			$	(35,025	)
Balance December 31, 2018	$	(25,396	)		$	(1,711	)		$	(27,107	)
OCI (loss) before reclassifications	(2,414		)		—				(2,414		)
Amounts reclassified from accumulated other comprehensive loss	1,513			(a)	732			(b)	2,245
Balance June 30, 2019	$	(26,297	)		$	(979	)		$	(27,276	)

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

(b)

These amounts primarily represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA.  See Note 7.