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Other Income and Other Expense (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Detail of other income and other expense
The following table provides detail of Pinnacle West's Consolidated other income and other expense for 2019, 2018 and 2017 (dollars in thousands):
 
 
2019
 
2018
 
2017
Other income:
 

 
 

 
 

Interest income
$
10,377

 
$
8,647

 
$
3,497

Debt return on Four Corners SCR deferral (Note 4)
19,541

 
16,153

 
354

Debt return on Ocotillo modernization project (Note 4)
20,282

 
—

 
—

Miscellaneous
63

 
96

 
155

Total other income
$
50,263

 
$
24,896

 
$
4,006

Other expense:
 

 
 

 
 

Non-operating costs
$
(10,663
)
 
$
(10,076
)
 
$
(11,749
)
Investment losses — net
(1,835
)
 
(417
)
 
(4,113
)
Miscellaneous
(5,382
)
 
(7,473
)
 
(5,677
)
Total other expense
$
(17,880
)
 
$
(17,966
)
 
$
(21,539
)

The following table provides detail of APS’s other income and other expense for 2019, 2018 and 2017 (dollars in thousands):
 
 
2019
 
2018
 
2017
Other income:
 

 
 

 
 

Interest income
$
6,998

 
$
6,496

 
$
2,504

Debt return on Four Corners SCR deferral (Note 4)
19,541

 
16,153

 
354

Debt return on Ocotillo modernization project (Note 4)
20,282

 
—

 
—

Miscellaneous
63

 
97

 
155

Total other income
$
46,884

 
$
22,746

 
$
3,013

Other expense:
 

 
 

 
 

Non-operating costs
$
(9,612
)
 
$
(9,462
)
 
$
(10,825
)
Miscellaneous
(3,378
)
 
(5,830
)
 
(3,088
)
Total other expense
$
(12,990
)
 
$
(15,292
)
 
$
(13,913
)