Long-Term Debt and Liquidity Matters (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of estimated fair value of long-term debt, including current maturities

The following table presents the estimated fair value of our long-term debt, including current maturities (dollars in thousands):

	As of June 30, 2018				As of December 31, 2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Pinnacle West	$	298,483	$	292,767	$	298,421	$	298,608
APS	4,493,042		4,660,281		4,573,292		5,006,348
Total	$	4,791,525	$	4,953,048	$	4,871,713	$	5,304,956