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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Detail of regulatory assets |  |
Total noncurrent regulatory assets | $ 1,822,100 | $ 1,711,511
Less: current regulatory assets | 538,879 | 518,524
Total noncurrent regulatory assets | 1,283,221 | 1,192,987
Pension |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 637,656 | 509,751
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 460,561 | 388,148
Income taxes — AFUDC equity |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 179,631 | 172,393
Ocotillo deferral |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 138,143 | 147,650
Retired power plant costs |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 98,692 | 114,841
SCR deferral |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 97,624 | 105,771
Deferred property taxes |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 41,057 | 49,626
Deferred compensation |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 33,660 | 33,997
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 23,977 | 24,768
Palo Verde VIEs (Note 17) |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 20,933 | 21,094
Active union medical trust |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 18,226 | 1,175
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 15,999 | 24,075
Navajo coal reclamation |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 13,862 | 16,840
Lost fixed cost recovery |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 9,547 | 63,889
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 9,468 | 11,020
Mead-Phoenix transmission line — contributions in aid of construction |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 9,048 | 9,380
Tax expense adjustor mechanism |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | 5,845 | 6,501
Other |  |
Detail of regulatory assets |  |
Total noncurrent regulatory assets | $ 8,171 | $ 10,592

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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