10. 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, as well as 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, 2013 (dollars in thousands):

	Percent Owned		Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%	$	1,701,844	$	1,027,523	$	22,400
Palo Verde Unit 2 (a)	16.8	%	543,972		338,918		10,095
Palo Verde Common	28.0	% (b)	538,818		219,801		81,599
Palo Verde Sale Leaseback		(a)	351,050		225,925		—
Four Corners Units 4, 5 and Common (d)	63.0	%	809,946		608,194		14,434
Navajo Generating Station Units 1, 2 and 3	14.0	%	270,448		150,501		2,864
Cholla common facilities (c)	63.3	% (b)	148,299		47,851		7,159
Transmission facilities:
ANPP 500kV System	34.2	% (b)	98,145		32,350		1,095
Navajo Southern System	22.2	% (b)	58,702		16,937		518
Palo Verde — Yuma 500kV System	18.0	% (b)	12,115		4,656		11,786
Four Corners Switchyards	48.1	% (b)	33,460		9,052		185
Phoenix — Mead System	17.1	% (b)	39,758		12,140		—
Palo Verde — Estrella 500kV System	50.0	% (b)	89,571		14,883		21
Morgan — Pinnacle Peak System	64.5	% (b)	130,132		6,651		1,042
Round Valley System	50.0	% (b)	488		268		—
Palo Verde — Morgan System	90.0	% (b)	—		—		36,601

(a) See Note 19.

(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.

(d) See Note 3.