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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Detail of regulatory assets |  |
Total regulatory assets | $ 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
Pension |  |
Detail of regulatory assets |  |
Total regulatory assets | 687,741 | 696,476
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Total regulatory assets | 322,667 | 463,195
Income taxes — allowance for funds used during construction (“AFUDC”) equity |  |
Detail of regulatory assets |  |
Total regulatory assets | 190,884 | 189,058
Ocotillo deferral |  |
Detail of regulatory assets |  |
Total regulatory assets | 122,197 | 128,636
Deferred fuel and purchased power — mark-to-market (Note 7) |  |
Detail of regulatory assets |  |
Total regulatory assets | 122,147 | 120,214
SCR deferral |  |
Detail of regulatory assets |  |
Total regulatory assets | 86,092 | 89,477
Retired power plant costs |  |
Detail of regulatory assets |  |
Total regulatory assets | 75,958 | 83,536
Lease incentives |  |
Detail of regulatory assets |  |
Total regulatory assets | 57,542 | 46,615
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Total regulatory assets | 35,450 | 34,230
Deferred compensation |  |
Detail of regulatory assets |  |
Total regulatory assets | 33,923 | 33,972
Deferred property taxes |  |
Detail of regulatory assets |  |
Total regulatory assets | 28,203 | 32,488
Palo Verde VIEs (Note 6) |  |
Detail of regulatory assets |  |
Total regulatory assets | 20,692 | 20,772
Active Union Medical Trust |  |
Detail of regulatory assets |  |
Total regulatory assets | 13,061 | 12,747
FERC Transmission true up |  |
Detail of regulatory assets |  |
Total regulatory assets | 10,073 | 616
Navajo coal reclamation |  |
Detail of regulatory assets |  |
Total regulatory assets | 9,394 | 10,883
Mead-Phoenix transmission line contributions in aid of construction (“CIAC”) |  |
Detail of regulatory assets |  |
Total regulatory assets | 8,550 | 8,716
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Total regulatory assets | 7,324 | 7,965
Power supply adjustor - interest |  |
Detail of regulatory assets |  |
Total regulatory assets | 5,848 | 19,416
Tax expense adjustor mechanism |  |
Detail of regulatory assets |  |
Total regulatory assets | 4,862 | 5,190
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Total regulatory assets | 3,884 | 7,922
Other |  |
Detail of regulatory assets |  |
Total regulatory assets | $ 4,419 | $ 3,912

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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