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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Detail of regulatory liabilities |  |
Current | $ 448,778 | $ 296,271
Non-Current | 2,438,672 | 2,499,213
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 537,720 | 614,683
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Current | 37,789 | 37,789
Non-Current | 324,697 | 337,027
Deferred fuel and purchased power — mark-to-market (Note 7) |  |
Detail of regulatory liabilities |  |
Current | 214,571 | 60,693
Non-Current | 91,521 | 46,908
Removal costs |  |
Detail of regulatory liabilities |  |
Current | 69,054 | 69,476
Non-Current | 48,302 | 50,104
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Current | 2,876 | 2,876
Non-Current | 64,655 | 64,802
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Current | 2,316 | 2,316
Non-Current | 51,629 | 53,076
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Current | 2,264 | 2,264
Non-Current | 47,253 | 47,337
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Current | 6,631 | 6,701
Non-Current | 37,136 | 38,581
Renewable energy standard |  |
Detail of regulatory liabilities |  |
Current | 30,729 | 38,453
Non-Current | 452 | 187
FERC transmission true up (b) |  |
Detail of regulatory liabilities |  |
Current | 27,595 | 21,379
Non-Current | 375 | 12,924
Property tax deferral (e) |  |
Detail of regulatory liabilities |  |
Current | 4,671 | 4,671
Non-Current | 14,353 | 15,521
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 14,571 | 13,797
Demand side management |  |
Detail of regulatory liabilities |  |
Current | 1,111 | 0
Non-Current | 9,216 | 5,417
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 4,835 | 4,835
Other |  |
Detail of regulatory liabilities |  |
Current | 1,029 | 1,511
Non-Current | 990 | 592
ACC | Excess deferred income taxes - Tax Act |  |
Detail of regulatory liabilities |  |
Current | 40,903 | 40,903
Non-Current | 969,459 | 971,545
FERC | Excess deferred income taxes - Tax Act |  |
Detail of regulatory liabilities |  |
Current | 7,239 | 7,239
Non-Current | $ 221,508 | $ 221,877

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