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Other Income and Other Expense (Tables)
 9 Months Ended
Sep. 30, 2025
Other Income and Expenses [Abstract]  
Schedule of Other Income and Other Expense
The following table provides detail of Pinnacle West’s consolidated other income and other expense (dollars in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
Other income:
Interest income (a)$4,730 $6,368 $14,986 $19,324 
Investment gain — net (b)6,259 — 23,747 — 
Gain on sale of BCE (Note 19)
— — — 22,988 
Miscellaneous1,484 406 3,305 922 
Total other income$12,473 $6,774 $42,038 $43,234 
Other expense:
Non-operating costs$(5,067)$(1,362)$(10,541)$(9,551)
Investment losses — net— — — (1,242)
Miscellaneous(3,092)(2,651)(4,447)(3,787)
Total other expense$(8,159)$(4,013)$(14,988)$(14,580)

(a)Interest income is primarily related to PSA interest. See Note 6.
(b)Investment gain is primarily related to El Dorado’s equity investment in SAI Advanced Power Solutions, Inc. (“SAI”). See Note 20.
The following table provides detail of APS’s other income and other expense (dollars in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
Other income:
Interest income (a)$3,710 $4,921 $12,991 $16,319 
Miscellaneous21 (42)136 6 
 Total other income$3,731 $4,879 $13,127 $16,325 
Other expense:
Non-operating costs$(4,573)$(2,896)$(9,441)$(7,548)
Miscellaneous(892)(450)(2,247)(1,586)
Total other expense$(5,465)$(3,346)$(11,688)$(9,134)
(a)Interest income is primarily related to PSA interest. See Note 6.