Leases (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Estimated future minimum lease payments for Pinnacle West's and APS's operating leases, excluding purchased power agreements

Estimated future minimum lease payments for Pinnacle West’s and APS’s operating leases, excluding purchased power agreements, are approximately as follows (dollars in thousands):

Year	Pinnacle West Consolidated		APS
2018	$	13,412	$	13,110
2019	11,054		10,802
2020	9,641		9,392
2021	7,105		6,858
2022	4,609		4,510
Thereafter	55,940		53,605
Total future lease commitments	$	101,761	$	98,277