XML 51 R19.htm IDEA: XBRL DOCUMENT v3.20.4
Jointly-Owned Facilities
 12 Months Ended
Dec. 31, 2020
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, 2020 (dollars in thousands):

 Percent
Owned		 Plant in
Service		Accumulated
Depreciation		Construction
Work in
Progress
Generating facilities:     
Palo Verde Units 1 and 329.1 %$1,911,339 $1,108,883 $26,623 
Palo Verde Unit 2 (a)16.8 %649,035 379,305 7,268 
Palo Verde Common28.0 %(b)774,054 320,107 41,607 
Palo Verde Sale Leaseback (a)351,050 253,014 — 
Four Corners Generating Station 63.0 %1,621,418 581,436 35,028 
Cholla common facilities (c)50.5 %193,807 109,447 1,206 
Transmission facilities:     
ANPP 500kV System33.5 % (b)131,991 52,626 3,859 
Navajo Southern System26.0 %(b)89,113 33,536 1,215 
Palo Verde — Yuma 500kV System25.3 %(b)23,247 6,681 433 
Four Corners Switchyards61.8 % (b)69,441 17,009 3,145 
Phoenix — Mead System17.1 %(b)39,437 19,072 73 
Palo Verde — Rudd 500kV System50.0 %93,123 28,206 1,921 
Morgan — Pinnacle Peak System64.6 % (b)117,497 20,754 912 
Round Valley System50.0 %531 174 13 
Palo Verde — Morgan System88.9 %(b)257,220 20,943 530 
Hassayampa — North Gila System80.0 %148,067 16,080 — 
Cholla 500kV Switchyard85.7 %7,896 1,850 940 
Saguaro 500kV Switchyard60.0 %21,669 13,229 2 
Kyrene — Knox System50.0 %578 323 — 
(a)See Note 18.
(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. Cholla Unit 4 was retired on December 24, 2020.