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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 16,833 | $ 85,382
Regulatory liabilities related to income taxes | 90,461 | 98,371
Federal tax credit carryforwards | 124,510 | 122,557
Regulatory disallowances | 42,330 | 28,037
Regulatory liability SJGS retirement credits | 28,797 | 0
Other | 35,492 | 33,849
Total deferred tax assets | 338,423 | 368,196
Deferred tax liabilities: |  |
Depreciation and plant related | (738,078) | (801,022)
Investment tax credit | (95,046) | (96,227)
Regulatory assets related to income taxes | (80,643) | (77,013)
Pension | (41,141) | (40,651)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (22,454) | (24,048)
Regulatory asset SJGS energy transition property | (86,521) | (69,828)
Regulatory asset PVNGS investment | (20,503) | 0
PVNGS trusts | (41,767) | (26,084)
Other | (57,550) | (56,154)
Total deferred tax liabilities | (1,183,703) | (1,191,027)
Net accumulated deferred income tax liabilities | (845,280) | (822,831)
PNM |  |
Deferred tax assets: |  |
Net operating loss | 0 | 54,681
Regulatory liabilities related to income taxes | 71,546 | 76,744
Federal tax credit carryforwards | 80,586 | 84,902
Regulatory disallowances | 42,330 | 28,037
Regulatory liability SJGS retirement credits | 28,797 | 0
Other | 35,993 | 33,079
Total deferred tax assets | 259,252 | 277,443
Deferred tax liabilities: |  |
Depreciation and plant related | (545,815) | (620,814)
Investment tax credit | (73,844) | (74,015)
Regulatory assets related to income taxes | (71,742) | (67,912)
Pension | (36,483) | (36,048)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (22,454) | (24,048)
Regulatory asset SJGS energy transition property | (86,521) | (69,828)
Regulatory asset PVNGS investment | (20,503) | 0
PVNGS trusts | (41,767) | (26,084)
Other | (44,160) | (40,734)
Total deferred tax liabilities | (943,289) | (959,483)
Net accumulated deferred income tax liabilities | (684,037) | (682,040)
TNMP |  |
Deferred tax assets: |  |
Regulatory liabilities related to income taxes | 18,915 | 21,627
Other | 5,534 | 5,353
Total deferred tax assets | 24,449 | 26,980
Deferred tax liabilities: |  |
Depreciation and plant related | (179,483) | (166,230)
Regulatory assets related to income taxes | (8,901) | (9,213)
Loss on reacquired debt | (5,254) | (5,527)
Pension | (4,659) | (4,603)
AMS | (2,613) | (3,989)
Other | (2,287) | (2,055)
Total deferred tax liabilities | (203,197) | (191,617)
Net accumulated deferred income tax liabilities | $ (178,748) | $ (164,637)

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