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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Detail of regulatory liabilities |  |  |
Current |  | $ 250,228 | $ 229,088
Non-Current |  | 2,427,769 | 2,450,169
Asset retirement obligations |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 0 | 0
Non-Current |  | 519,015 | 506,049
Other postretirement benefits |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 37,705 | 37,705
Non-Current |  | 337,853 | 349,588
Removal costs |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 55,247 | 52,844
Non-Current |  | 89,937 | 103,008
Income taxes — change in rates |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,839 | 2,839
Non-Current |  | 66,374 | 66,553
Four Corners coal reclamation |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 5,461 | 5,460
Non-Current |  | 49,703 | 49,435
Income taxes — deferred investment tax credit |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,231 | 2,231
Non-Current |  | 48,507 | 48,648
Spent nuclear fuel |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 6,831 | 6,768
Non-Current |  | 43,059 | 44,221
Renewable energy standard |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 34,460 | 39,442
Non-Current |  | 30 | 103
Deferred fuel and purchased power — mark-to-market (Note 7) |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 20,829 | 0
Non-Current |  | 0 | 0
Property tax deferral |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 0 | 0
Non-Current |  | 15,022 | 13,856
Sundance maintenance |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,867 | 2,989
Non-Current |  | 11,910 | 11,508
Demand side management |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,821 | 10,819
Non-Current |  | 5,975 | 0
FERC transmission true up |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,630 | 6,598
Non-Current |  | 2,379 | 3,008
TCA balancing account |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,315 | 2,902
Non-Current |  | 1,754 | 4,672
Tax expense adjustor mechanism |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,452 | 7,089
Non-Current |  | 0 | 0
Tax expense adjustor mechanism | Forecast |  |  |
Detail of regulatory liabilities |  |  |
Current | $ 7,000 |  |
Deferred gains on utility property |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,423 | 2,423
Non-Current |  | 939 | 1,544
Active union medical trust |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 0 | 0
Non-Current |  | 2,337 | 6,057
Other |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 524 | 409
Non-Current |  | 59 | 189
ACC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 41,353 | 41,330
Non-Current |  | 1,004,226 | 1,012,583
United States Federal Energy Regulatory Commission | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,240 | 7,240
Non-Current |  | $ 228,690 | $ 229,147

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