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Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss $ 161,691 $ 153,858
Regulatory liabilities related to income taxes 80,031 78,858
Federal tax credit carryforwards 77,417 54,748
Shutdown of SJGS Units 2 and 3 53,823 0
Other 70,749 68,566
Total deferred tax assets 443,711 356,030
Deferred tax liabilities:    
Depreciation and plant related (1,027,047) (914,926)
Investment tax credit (56,589) (36,790)
Regulatory assets related to income taxes (71,054) (67,910)
CTC (16,151) (19,352)
Pension (65,226) (66,498)
Other (85,037) (115,282)
Total deferred tax liabilities (1,321,104) (1,220,758)
Current accumulated deferred income tax (asset) liability (877,393) (864,728)
Non-current accumulated deferred income tax liability (877,393) (864,728)
Public Service Company of New Mexico [Member]    
Deferred tax assets:    
Net operating loss 116,693 108,505
Regulatory liabilities related to income taxes 75,889 74,293
Federal tax credit carryforwards 57,928 35,259
Shutdown of SJGS Units 2 and 3 53,823 0
Other 41,210 35,681
Total deferred tax assets 345,543 253,738
Deferred tax liabilities:    
Depreciation and plant related (828,926) (733,519)
Investment tax credit (56,589) (36,790)
Regulatory assets related to income taxes (61,018) (57,637)
Pension (58,070) (58,474)
Other (37,324) (70,714)
Total deferred tax liabilities (1,041,927) (957,134)
Current accumulated deferred income tax (asset) liability (696,384) (703,396)
Non-current accumulated deferred income tax liability (696,384) (703,396)
Texas-New Mexico Power Company [Member]    
Deferred tax assets:    
Regulatory liabilities related to income taxes 4,141 4,565
Other 6,702 13,429
Total deferred tax assets 10,843 17,994
Deferred tax liabilities:    
Depreciation and plant related (189,322) (174,510)
Regulatory assets related to income taxes (10,036) (10,273)
Loss on reacquired debt (12,392) (12,846)
CTC (16,151) (19,352)
Other (15,733) (12,560)
Total deferred tax liabilities (243,634) (229,541)
Current accumulated deferred income tax (asset) liability (232,791) (211,547)
Non-current accumulated deferred income tax liability $ (232,791) $ (211,547)