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Regulatory Matters (Tables)
 6 Months Ended
Jun. 30, 2024
Regulated Operations [Abstract]  
Schedule of Capital Structure and Cost of Capital the following proposed capital structure and costs of capital:
Capital StructureCost of Capital
Long-term debt48.07 %3.85 %
Common stock equity51.93 %10.25 %
Weighted-average cost of capital7.17 %
Schedule of Changes in The Deferred Fuel and Purchased Power Regulatory Asset
The following table shows the changes in the deferred fuel and purchased power regulatory asset for 2024 and 2023 (dollars in thousands):
 Six Months Ended
June 30,
 20242023
Beginning balance$463,195 $460,561 
Deferred fuel and purchased power costs — current period64,220 191,304 
Amounts charged to customers
(204,748)(218,586)
Ending balance$322,667 $433,279 
Schedule of Regulatory Assets
The detail of regulatory assets is as follows (dollars in thousands): 
 Amortization ThroughJune 30, 2024December 31, 2023
Pension(a)$687,741 $696,476 
Deferred fuel and purchased power (b) (c)2025322,667 463,195 
Income taxes — allowance for funds used during construction (“AFUDC”) equity2054190,884 189,058 
Ocotillo deferral2034122,197 128,636 
Deferred fuel and purchased power — mark-to-market (Note 7)
2026122,147 120,214 
SCR deferral (e)203886,092 89,477 
Retired power plant costs203375,958 83,536 
Lease incentives(g)57,542 46,615 
Income taxes — investment tax credit basis adjustment205635,450 34,230 
Deferred compensation203633,923 33,972 
Deferred property taxes202728,203 32,488 
Palo Verde VIEs (Note 6)
204620,692 20,772 
Active Union Medical Trust(f)13,061 12,747 
FERC Transmission true up202610,073 616 
Navajo coal reclamation20269,394 10,883 
Mead-Phoenix transmission line contributions in aid of construction (“CIAC”)20508,550 8,716 
Loss on reacquired debt20387,324 7,965 
Power supply adjustor - interest20255,848 19,416 
Tax expense adjustor mechanism (b)20314,862 5,190 
Four Corners cost deferral20243,884 7,922 
OtherVarious4,419 3,912 
Total regulatory assets (d) $1,850,911 $2,016,036 
Less: current regulatory assets$491,933 $625,757 
Total non-current regulatory assets$1,358,978 $1,390,279 

(a)This asset represents the future recovery of pension benefit obligations and expense through retail rates.  If these costs are disallowed by the ACC, this regulatory asset would be charged to OCI and result in lower future revenues.  As a result of the 2019 Rate Case decision, the amount authorized for inclusion in rate base was determined using an averaging methodology, which resulted in a reduced return in retail rates. The 2022 Rate Case decision allows for the full return on the pension asset in rate base. See Note 5 for further discussion.
(b)See “Cost Recovery Mechanisms” discussion above.
(c)Subject to a carrying charge.
(d)There are no regulatory assets for which the ACC has allowed recovery of costs but not allowed a return by exclusion from rate base.  FERC rates are set using a formula rate as described in “Transmission Rates, Transmission Cost Adjustor and Other Transmission Matters.”
(e)See “Four Corners SCR Cost Recovery” discussion above.
(f)Collected in retail rates.
(g)Amortization periods vary based on specific terms of lease contract.
Schedule of Regulatory Liabilities
The detail of regulatory liabilities is as follows (dollars in thousands):
 Amortization ThroughJune 30, 2024December 31, 2023
Excess deferred income taxes - ACC — Tax Cuts and Jobs Act (a)2046$914,436 $930,344 
Excess deferred income taxes - FERC — Tax Cuts and Jobs Act (a)2058211,881 214,667 
Asset retirement obligations2057303,303 392,383 
Other postretirement benefits(c)205,107 226,726 
Removal costs(d)82,823 94,368 
Income taxes — deferred investment tax credit205667,435 68,521 
Income taxes — change in rates205359,578 60,667 
Four Corners coal reclamation203857,493 55,917 
Renewable energy standard (b)202448,327 43,251 
Spent nuclear fuel202729,415 33,154 
Demand side management (b)202426,333 14,374 
Sundance maintenance203121,537 19,989 
Property tax deferral20277,826 10,850 
Tax expense adjustor mechanism (b)20324,645 4,835 
FERC transmission true up (b)2026— 1,869 
OtherVarious1,642 3,873 
Total regulatory liabilities $2,041,781 $2,175,788 
Less: current regulatory liabilities$230,551 $209,923 
Total non-current regulatory liabilities$1,811,230 $1,965,865 

(a)For purposes of presentation on the Statement of Cash Flows, amortization of the regulatory liabilities for excess deferred income taxes are reflected as “Deferred income taxes” under Cash Flows From Operating Activities.
(b)See “Cost Recovery Mechanisms” discussion above.
(c)See Note 5.
(d)In accordance with regulatory accounting, APS accrues removal costs for its regulated assets, even if there is no legal obligation for removal.