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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss $ 82,386 $ 98,301
Regulatory liabilities related to income taxes 158,416 189,501
Federal tax credit carryforwards 76,481 71,849
Shutdown of SJGS Units 2 and 3 1,638 2,204
Other 97,515 45,656
Total deferred tax assets 416,436 407,511
Deferred tax liabilities:    
Depreciation and plant related (767,482) (690,909)
Investment tax credit (57,853) (55,731)
Regulatory assets related to income taxes (62,889) (61,956)
CTC (3,613) (5,670)
Pension (35,407) (56,070)
Regulatory asset for shutdown of SJGS Units 2 and 3 (30,425) (31,887)
Other (59,486) (52,498)
Total deferred tax liabilities (1,017,155) (954,721)
Net accumulated deferred income tax liabilities (600,719) (547,210)
Public Service Company of New Mexico    
Deferred tax assets:    
Net operating loss 50,762 67,719
Regulatory liabilities related to income taxes 125,395 152,059
Federal tax credit carryforwards 62,230 60,085
Shutdown of SJGS Units 2 and 3 1,638 2,204
Other 36,916 23,801
Total deferred tax assets 276,941 305,868
Deferred tax liabilities:    
Depreciation and plant related (606,673) (544,270)
Investment tax credit (55,484) (55,731)
Regulatory assets related to income taxes (53,561) (52,392)
Pension (31,046) (51,774)
Regulatory asset for shutdown of SJGS Units 2 and 3 (30,425) (31,887)
Other (2,519) (18,826)
Total deferred tax liabilities (779,708) (754,880)
Net accumulated deferred income tax liabilities (502,767) (449,012)
Texas-New Mexico Power Company    
Deferred tax assets:    
Regulatory liabilities related to income taxes 33,021 43,103
Other 4,517 3,762
Total deferred tax assets 37,538 46,865
Deferred tax liabilities:    
Depreciation and plant related (136,117) (135,647)
Regulatory assets related to income taxes (9,328) (9,564)
Loss on reacquired debt (6,617) (6,890)
CTC (3,613) (5,670)
Pension (4,361) (4,296)
AMS (10,030) (7,707)
Other (3,710) (3,506)
Total deferred tax liabilities (173,776) (173,280)
Net accumulated deferred income tax liabilities $ (136,238) $ (126,415)