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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Detail of regulatory liabilities |  |
Total regulatory liabilities | $ 2,333,351 | $ 2,795,484
Less: current regulatory liabilities | 271,575 | 296,271
Total noncurrent regulatory liabilities | 2,061,776 | 2,499,213
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 354,002 | 614,683
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 270,604 | 374,816
Removal costs |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 106,889 | 119,580
Deferred Fuel and Purchased Power MTM Costs [Member] |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 96,367 | 107,601
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 64,806 | 67,678
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 52,592 | 55,392
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 48,035 | 49,601
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 39,217 | 45,282
Renewable energy program |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 35,720 | 38,640
FERC transmission true up |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 22,895 | 34,303
Property tax deferral |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 15,521 | 20,192
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 16,893 | 13,797
Demand side management |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 8,461 | 5,417
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 4,835 | 4,835
Other |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 3,092 | 2,103
ACC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | 971,545 | 1,012,448
FERC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Total regulatory liabilities | $ 221,877 | $ 229,116

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