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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | $ 2,251,600 | $ 2,333,351
Less: current regulatory liabilities | 219,075 | 271,575
Total non-current regulatory liabilities | 2,032,525 | 2,061,776
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 407,028 | 354,002
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 246,580 | 270,604
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 102,245 | 106,889
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 64,098 | 64,806
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 59,359 | 48,035
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 53,390 | 52,592
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 36,061 | 39,217
Renewable energy standard (b) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 29,524 | 35,720
Demand side management (b) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 22,236 | 8,461
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 18,441 | 16,893
Property tax deferral (e) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 13,186 | 15,521
FERC transmission true up (b) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 5,870 | 22,895
Tax expense adjustor mechanism (b) (e) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 4,835 | 4,835
Deferred fuel and purchased power — mark-to-market (Note 7) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 0 | 96,367
Other |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 7,295 | 3,092
ACC | Excess deferred income taxes - Tax Act |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 961,359 | 971,545
FERC | Excess deferred income taxes - Tax Act |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | $ 220,093 | $ 221,877

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