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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss $ 32,441 $ 41,419
Regulatory liabilities related to income taxes 120,651 148,961
Federal tax credit carryforwards 122,436 121,354
Regulatory disallowances 38,835 38,531
Other 34,812 42,885
Total deferred tax assets 349,175 393,150
Deferred tax liabilities:    
Depreciation and plant related (787,295) (738,342)
Investment tax credit 97,409 98,669
Regulatory assets related to income taxes (78,211) (61,330)
Pension (40,828) (37,099)
Regulatory asset for shutdown of SJGS Units 2 and 3 (25,643) (27,237)
Other (84,639) (124,985)
Total deferred tax liabilities (1,114,025) (1,087,662)
Net accumulated deferred income tax liabilities (764,850) (694,512)
Public Service Company of New Mexico    
Deferred tax assets:    
Net operating loss 1,854 0
Regulatory liabilities related to income taxes 96,161 121,569
Federal tax credit carryforwards 86,811 84,719
Regulatory disallowances 38,835 38,531
Other 36,599 46,444
Total deferred tax assets 260,260 291,263
Deferred tax liabilities:    
Depreciation and plant related (616,567) (576,079)
Investment tax credit 74,187 74,424
Regulatory assets related to income taxes (68,687) (51,493)
Pension (36,283) (32,413)
Regulatory asset for shutdown of SJGS Units 2 and 3 (25,643) (27,237)
Other (69,575) (108,767)
Total deferred tax liabilities (890,942) (870,413)
Net accumulated deferred income tax liabilities (630,682) (579,150)
Texas-New Mexico Power Company    
Deferred tax assets:    
Regulatory liabilities related to income taxes 24,490 27,392
Other 3,648 4,548
Total deferred tax assets 28,138 31,940
Deferred tax liabilities:    
Depreciation and plant related (157,649) (148,279)
Regulatory assets related to income taxes (9,525) (9,836)
Loss on reacquired debt (5,799) (6,072)
AMS (5,249) (6,915)
Pension (4,545) (4,685)
Other (2,619) (1,522)
Total deferred tax liabilities (185,386) (177,309)
Net accumulated deferred income tax liabilities $ (157,248) $ (145,369)