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Fair Value Measurements - Schedule of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
ASSETS    
Cash equivalents   $ 23
Nuclear decommissioning trusts: $ 1,337,858 1,282,845
Nuclear decommissioning trust, other 453,729 426,404
Other special use funds: 423,332 408,357
Other special use funds, other 2,844 2,851
Total assets 1,806,296 1,707,783
Total assets, other 445,333 425,485
Commodity contracts    
ASSETS    
Commodity contracts 45,106 16,558
Commodity contracts, other (11,240) (3,770)
LIABILITIES    
Derivative instruments, other 6,049 817
Amounts Reported on Balance Sheets (32,836) (61,786)
Equity securities    
ASSETS    
Nuclear decommissioning trusts: 21,590 15,736
Nuclear decommissioning trust, other 3,676 3,335
Other special use funds: 67,166 27,813
Other special use funds, other 2,844 2,851
U.S. commingled equity funds    
ASSETS    
Nuclear decommissioning trusts: 450,053 423,069
U.S. Treasury debt    
ASSETS    
Nuclear decommissioning trusts: 347,666 367,396
Other special use funds: 356,166 355,544
Corporate debt    
ASSETS    
Nuclear decommissioning trusts: 231,394 203,180
Mortgage-backed securities    
ASSETS    
Nuclear decommissioning trusts: 224,600 208,533
Municipal bonds    
ASSETS    
Nuclear decommissioning trusts: 36,981 37,429
Other fixed income    
ASSETS    
Nuclear decommissioning trusts: 25,574 27,502
Cash equivalents    
ASSETS    
Other special use funds:   25,000
Other special use funds, other   0
Level 1    
ASSETS    
Cash equivalents   23
Nuclear decommissioning trusts: 365,580 379,255
Other special use funds: 420,488 405,506
Total assets 786,068 784,784
Level 1 | Pinnacle West Captive Insurance Cell    
ASSETS    
Other special use funds: 38,500 34,200
Level 1 | Commodity contracts    
ASSETS    
Commodity contracts 0 0
LIABILITIES    
Derivative instruments 0 0
Level 1 | Equity securities    
ASSETS    
Nuclear decommissioning trusts: 17,914 11,859
Other special use funds: 64,322 24,962
Level 1 | Equity securities | Pinnacle West Captive Insurance Cell    
ASSETS    
Other special use funds:   9,200
Level 1 | U.S. commingled equity funds    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 1 | U.S. Treasury debt    
ASSETS    
Nuclear decommissioning trusts: 347,666 367,396
Other special use funds: 356,166 355,544
Level 1 | Corporate debt    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 1 | Mortgage-backed securities    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 1 | Municipal bonds    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 1 | Other fixed income    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 1 | Cash equivalents    
ASSETS    
Other special use funds:   25,000
Level 1 | Cash equivalents | Pinnacle West Captive Insurance Cell    
ASSETS    
Other special use funds:   25,000
Level 2    
ASSETS    
Cash equivalents   0
Nuclear decommissioning trusts: 518,549 477,186
Other special use funds: 0 0
Total assets 570,655 490,338
Level 2 | Commodity contracts    
ASSETS    
Commodity contracts 52,106 13,152
LIABILITIES    
Derivative instruments (15,853) (40,388)
Level 2 | Equity securities    
ASSETS    
Nuclear decommissioning trusts: 0 542
Other special use funds: 0 0
Level 2 | U.S. commingled equity funds    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 2 | U.S. Treasury debt    
ASSETS    
Nuclear decommissioning trusts: 0 0
Other special use funds: 0 0
Level 2 | Corporate debt    
ASSETS    
Nuclear decommissioning trusts: 231,394 203,180
Level 2 | Mortgage-backed securities    
ASSETS    
Nuclear decommissioning trusts: 224,600 208,533
Level 2 | Municipal bonds    
ASSETS    
Nuclear decommissioning trusts: 36,981 37,429
Level 2 | Other fixed income    
ASSETS    
Nuclear decommissioning trusts: 25,574 27,502
Level 2 | Cash equivalents    
ASSETS    
Other special use funds:   0
Level 3    
ASSETS    
Cash equivalents   0
Nuclear decommissioning trusts: 0 0
Other special use funds: 0 0
Total assets 4,240 7,176
Level 3 | Commodity contracts    
ASSETS    
Commodity contracts 4,240 7,176
LIABILITIES    
Derivative instruments (23,032) (22,215)
Level 3 | Equity securities    
ASSETS    
Nuclear decommissioning trusts: 0 0
Other special use funds: 0 0
Level 3 | U.S. commingled equity funds    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 3 | U.S. Treasury debt    
ASSETS    
Nuclear decommissioning trusts: 0 0
Other special use funds: 0 0
Level 3 | Corporate debt    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 3 | Mortgage-backed securities    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 3 | Municipal bonds    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 3 | Other fixed income    
ASSETS    
Nuclear decommissioning trusts: 0 0
Level 3 | Cash equivalents    
ASSETS    
Other special use funds:   0
Fair Value Measured at Net Asset Value Per Share | U.S. commingled equity funds    
ASSETS    
Nuclear decommissioning trusts: $ 450,053 $ 423,069