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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Detail of regulatory liabilities |  |
Total regulatory liabilities | $ 2,062,233 | $ 2,175,788
Less: current regulatory liabilities | 206,955 | 209,923
Total non-current regulatory liabilities | 1,855,278 | 1,965,865
Asset retirement obligations and removal costs |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 358,403 | 486,751
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 238,113 | 226,726
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 77,532 | 68,521
Renewable energy standard |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 68,523 | 60,667
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 66,327 | 55,917
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 59,133 | 43,251
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 26,818 | 33,154
Demand side management |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 23,927 | 14,374
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 23,086 | 19,989
TCA Balancing Account |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 14,834 | 3,425
Property tax deferral |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 4,785 | 10,850
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 4,343 | 4,835
Other |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 113 | 2,317
ACC | Excess deferred income taxes - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 888,896 | 930,344
FERC | Excess deferred income taxes - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | $ 207,400 | $ 214,667

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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