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Jointly-Owned Facilities
 12 Months Ended
Dec. 31, 2019
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, 2019 (dollars in thousands):

 
 
Percent
Owned
 
 
 
Plant in
Service
 
Accumulated
Depreciation
 
Construction
Work in
Progress
 
Generating facilities:
 
 

 
 
 
 

 
 

 
 

 
Palo Verde Units 1 and 3
 
29.1
%
 

 
$
1,877,748

 
$
1,102,609

 
$
22,071

 
Palo Verde Unit 2 (a)
 
16.8
%
 

 
634,545

 
377,722

 
11,831

 
Palo Verde Common
 
28.0
%
 
(b)
 
746,653

 
290,084

 
46,570

 
Palo Verde Sale Leaseback
 
 

 
(a)
 
351,050

 
249,144

 
—

 
Four Corners Generating Station
 
63.0
%
 

 
1,520,171

 
559,272

 
44,842

 
Cholla common facilities (c)
 
50.5
%
 

 
184,608

 
95,720

 
1,323

 
Transmission facilities:
 
 

 
 
 
 

 
 

 
 

 
ANPP 500kV System
 
33.5
%
 
 (b)
 
133,396

 
51,248

 
2,723

 
Navajo Southern System
 
26.7
%
 
(b)
 
89,672

 
31,985

 
194

 
Palo Verde — Yuma 500kV System
 
19.0
%
 
(b)
 
15,274

 
6,486

 
4,886

 
Four Corners Switchyards
 
63.0
%
 
 (b)
 
69,994

 
16,674

 
2,395

 
Phoenix — Mead System
 
17.1
%
 
(b)
 
39,355

 
18,570

 
53

 
Palo Verde — Rudd 500kV System
 
50.0
%
 

 
93,112

 
26,719

 
317

 
Morgan — Pinnacle Peak System
 
64.6
%
 
 (b)
 
117,752

 
18,822

 
—

 
Round Valley System
 
50.0
%
 

 
515

 
164

 
—

 
Palo Verde — Morgan System
 
88.9
%
 
(b)
 
238,689

 
13,146

 
—

 
Hassayampa — North Gila System
 
80.0
%
 

 
143,422

 
12,676

 
—

 
Cholla 500kV Switchyard
 
85.7
%
 

 
7,651

 
1,597

 
535

 
Saguaro 500kV Switchyard
 
60.0
%
 

 
20,425

 
12,949

 
—

 
Kyrene — Knox System
 
50.0
%
 

 
578

 
315

 
—

 
(a)
See Note 19.
(b)
Weighted-average of interests.
(c)
PacifiCorp owns Cholla Unit 4 (see Note 4 for additional information) and APS operates the unit for PacifiCorp.  The common facilities at Cholla are jointly-owned.

See "Navajo Plant" in Note 4 for more details.