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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss $ 41,419 $ 59,488
Regulatory liabilities related to income taxes 148,961 145,087
Federal tax credit carryforwards 121,354 101,231
Regulatory disallowances 38,531 34,639
Other 42,885 54,199
Total deferred tax assets 393,150 394,644
Deferred tax liabilities:    
Depreciation and plant related (738,342) (787,928)
Investment tax credit (98,669) (81,186)
Regulatory assets related to income taxes (61,330) (58,495)
CTC 0 (1,466)
Pension (37,099) (35,029)
Regulatory asset for shutdown of SJGS Units 2 and 3 (27,237) (28,831)
Other (124,985) (27,767)
Total deferred tax liabilities (1,087,662) (1,020,702)
Net accumulated deferred income tax liabilities (694,512) (626,058)
Public Service Company of New Mexico    
Deferred tax assets:    
Net operating loss 0 25,889
Regulatory liabilities related to income taxes 121,569 114,849
Federal tax credit carryforwards 84,719 82,983
Shutdown of SJGS Units 2 and 3 0 0
Regulatory disallowances 38,531 34,639
Other 46,444 38,735
Total deferred tax assets 291,263 297,095
Deferred tax liabilities:    
Depreciation and plant related (576,079) (630,293)
Investment tax credit (74,424) (74,667)
Regulatory assets related to income taxes (51,493) (49,479)
Pension (32,413) (30,609)
Regulatory asset for shutdown of SJGS Units 2 and 3 (27,237) (28,831)
Other (108,767) (5,206)
Total deferred tax liabilities (870,413) (819,085)
Net accumulated deferred income tax liabilities (579,150) (521,990)
Texas-New Mexico Power Company    
Deferred tax assets:    
Regulatory liabilities related to income taxes 27,392 30,238
Other 4,548 3,788
Total deferred tax assets 31,940 34,026
Deferred tax liabilities:    
Depreciation and plant related (148,279) (142,791)
Regulatory assets related to income taxes (9,836) (9,016)
Loss on reacquired debt (6,072) (6,345)
CTC 0 (1,466)
Pension (4,685) (4,420)
AMS (6,915) (8,473)
Other (1,522) (1,666)
Total deferred tax liabilities (177,309) (174,177)
Net accumulated deferred income tax liabilities $ (145,369) $ (140,151)