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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Detail of regulatory assets |  |
Total non-current regulatory assets | $ 2,016,036 | $ 1,822,100
Less: current regulatory assets | 625,757 | 538,879
Total non-current regulatory assets | 1,390,279 | 1,283,221
Pension |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 696,476 | 637,656
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 463,195 | 460,561
Income taxes — AFUDC equity |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 189,058 | 179,631
Ocotillo deferral |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 128,636 | 138,143
Deferred fuel and purchased power — mark-to-market (Note 16) |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 120,214 | 0
SCR deferral |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 89,477 | 97,624
Retired power plant costs |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 83,536 | 98,692
Lease incentives (Note 8) |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 46,615 | 0
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 34,230 | 23,977
Deferred compensation |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 33,972 | 33,660
Deferred property taxes |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 32,488 | 41,057
Palo Verde VIEs (Note 17) |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 20,772 | 20,933
Power supply adjustor-interest |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 19,416 | 1,541
Active union medical trust |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 12,747 | 18,226
Navajo coal reclamation |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 10,883 | 13,862
Mead-Phoenix transmission line — contributions in aid of construction |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 8,716 | 9,048
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 7,965 | 9,468
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 7,922 | 15,999
Tax expense adjustor mechanism |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 5,190 | 5,845
Lost fixed cost recovery |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | 0 | 9,547
Other |  |
Detail of regulatory assets |  |
Total non-current regulatory assets | $ 4,528 | $ 6,630

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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//1943274/2147481878/980-340-50-1 + Details
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