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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 59,488 | $ 82,386
Regulatory liabilities related to income taxes | 145,087 | 158,416
Federal tax credit carryforwards | 101,231 | 76,481
Shutdown of SJGS Units 2 and 3 | 0 | 1,638
Regulatory disallowance related to NM 2015 Rate Case (Note 17) | 34,639 | 0
Other | 54,199 | 97,515
Total deferred tax assets | 394,644 | 416,436
Deferred tax liabilities: |  |
Depreciation and plant related | (787,928) | (767,482)
Investment tax credit | (81,186) | (57,853)
Regulatory assets related to income taxes | (58,495) | (62,889)
CTC | (1,466) | (3,613)
Pension | (35,029) | (35,407)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (28,831) | (30,425)
Other | (27,767) | (59,486)
Total deferred tax liabilities | (1,020,702) | (1,017,155)
Net accumulated deferred income tax liabilities | (626,058) | (600,719)
Public Service Company of New Mexico |  |
Deferred tax assets: |  |
Net operating loss | 25,889 | 50,762
Regulatory liabilities related to income taxes | 114,849 | 125,395
Federal tax credit carryforwards | 82,983 | 62,230
Shutdown of SJGS Units 2 and 3 | 34,639 | 0
Regulatory disallowance related to NM 2015 Rate Case (Note 17) | 0 | 1,638
Other | 38,735 | 36,916
Total deferred tax assets | 297,095 | 276,941
Deferred tax liabilities: |  |
Depreciation and plant related | (630,293) | (606,673)
Investment tax credit | (74,667) | (55,484)
Regulatory assets related to income taxes | (49,479) | (53,561)
Pension | (30,609) | (31,046)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (28,831) | (30,425)
Other | (5,206) | (2,519)
Total deferred tax liabilities | (819,085) | (779,708)
Net accumulated deferred income tax liabilities | (521,990) | (502,767)
Texas-New Mexico Power Company |  |
Deferred tax assets: |  |
Regulatory liabilities related to income taxes | 30,238 | 33,021
Other | 3,788 | 4,517
Total deferred tax assets | 34,026 | 37,538
Deferred tax liabilities: |  |
Depreciation and plant related | (142,791) | (136,117)
Regulatory assets related to income taxes | (9,016) | (9,328)
Loss on reacquired debt | (6,345) | (6,617)
CTC | (1,466) | (3,613)
Pension | (4,420) | (4,361)
AMS | (8,473) | (10,030)
Other | (1,666) | (3,710)
Total deferred tax liabilities | (174,177) | (173,776)
Net accumulated deferred income tax liabilities | $ (140,151) | $ (136,238)

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