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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss $ 98,301 $ 160,901
Regulatory liabilities related to income taxes 189,501 64,657
Federal tax credit carryforwards 71,849 78,675
Shutdown of SJGS Units 2 and 3 2,204 53,434
Other 45,656 75,805
Total deferred tax assets 407,511 433,472
Deferred tax liabilities:    
Depreciation and plant related (690,909) (1,102,458)
Investment tax credit (55,731) (56,017)
Regulatory assets related to income taxes (61,956) (66,378)
CTC (5,670) (12,715)
Pension (56,070) (57,287)
Regulatory asset for shutdown of SJGS Units 2 and 3 (31,887) 0
Other (52,498) (79,267)
Total deferred tax liabilities (954,721) (1,374,122)
Net accumulated deferred income tax liabilities (547,210) (940,650)
Public Service Company of New Mexico    
Deferred tax assets:    
Net operating loss 67,719 117,922
Regulatory liabilities related to income taxes 152,059 60,940
Federal tax credit carryforwards 60,085 59,156
Shutdown of SJGS Units 2 and 3 2,204 53,434
Other 23,801 41,700
Total deferred tax assets 305,868 333,152
Deferred tax liabilities:    
Depreciation and plant related (544,270) (891,578)
Investment tax credit (55,731) (56,017)
Regulatory assets related to income taxes (52,392) (56,577)
Pension (51,774) (50,134)
Regulatory asset for shutdown of SJGS Units 2 and 3 (31,887) 0
Other (18,826) (27,512)
Total deferred tax liabilities (754,880) (1,081,818)
Net accumulated deferred income tax liabilities (449,012) (748,666)
Texas-New Mexico Power Company    
Deferred tax assets:    
Regulatory liabilities related to income taxes 43,103 3,718
Other 3,762 6,016
Total deferred tax assets 46,865 9,734
Deferred tax liabilities:    
Depreciation and plant related (135,647) (201,017)
Regulatory assets related to income taxes (9,564) (9,800)
Loss on reacquired debt (6,890) (11,937)
CTC (5,670) (12,715)
Pension (4,296) (7,153)
AMS (7,707) (8,928)
Other (3,506) (3,969)
Total deferred tax liabilities (173,280) (255,519)
Net accumulated deferred income tax liabilities $ (126,415) $ (245,785)