Jointly-Owned Facilities

12 Months Ended

Dec. 31, 2018

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

Jointly-Owned Facilities

Jointly-Owned Facilities

APS shares ownership of some of its generating and transmission facilities with other companies.  We are responsible for our share of operating costs which are included in the corresponding operating expenses on our Consolidated Statements of Income. We are also responsible for providing our own financing.  Our share of operating expenses and utility plant costs related to these facilities is accounted for using proportional consolidation.  The following table shows APS’s interests in those jointly-owned facilities recorded on the Consolidated Balance Sheets at December 31, 2018 (dollars in thousands):

	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	1,887,729	$	1,095,878	$	25,185
Palo Verde Unit 2 (a)	16.8	%		638,419		369,372		20,852
Palo Verde Common	28.0	%	(b)	752,300		277,414		39,995
Palo Verde Sale Leaseback			(a)	351,050		245,275		—
Four Corners Generating Station	63.0	%		1,466,579		544,308		23,430
Cholla common facilities (c)	50.5	%		183,390		82,434		893
Transmission facilities:
ANPP 500kV System	33.5	%	(b)	129,587		49,340		2,705
Navajo Southern System	26.7	%	(b)	82,046		30,464		284
Palo Verde — Yuma 500kV System	19.0	%	(b)	15,304		6,729		530
Four Corners Switchyards	63.1	%	(b)	68,707		15,436		1,334
Phoenix — Mead System	17.1	%	(b)	39,329		18,527		44
Palo Verde — Rudd 500kV System	50.0	%		93,887		25,573		302
Morgan — Pinnacle Peak System	64.6	%	(b)	117,722		16,744		—
Round Valley System	50.0	%		515		153		—
Palo Verde — Morgan System	87.9	%	(b)	219,292		6,660		—
Hassayampa — North Gila System	80.0	%		142,541		9,805		—
Cholla 500kV Switchyard	85.7	%		5,078		1,414		38
Saguaro 500kV Switchyard	60.0	%		20,414		12,790		—
Kyrene — Knox System	50.0	%		578		307		—

(a) See Note 18.

(b) Weighted-average of interests.

(c) PacifiCorp owns Cholla Unit 4 and APS operates the unit for PacifiCorp.  The common facilities at Cholla are jointly-owned.

APS also has a 14% ownership in the Navajo Plant.  In the second quarter of 2017, APS’s remaining net book value of its interest was reclassified from property, plant and equipment to a regulatory asset.  See “Navajo Plant” in Note 3 for more details.