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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Regulatory Assets
Current	$ 3,855	$ 1,070
Non-Current	501,223	470,664
Regulatory Liabilities
Current	(3,609)	(15,591)
Non-Current	(455,649)	(467,413)
Public Service Company of New Mexico [Member]
Regulatory Assets
Current	3,442	0
Non-Current	365,413	342,910
Total regulatory assets	368,855	342,910
Regulatory Liabilities
Current	(3,517)	(15,591)
Non-Current	(423,701)	(434,863)
Total regulatory liabilities	(427,218)	(450,454)
Public Service Company of New Mexico [Member] | FPPAC [Member]
Regulatory Liabilities
Current	0	(11,410)
Public Service Company of New Mexico [Member] | Renewable Energy Rider [Member]
Regulatory Liabilities
Current	(3,411)	(2,584)
Public Service Company of New Mexico [Member] | Other Current [Member]
Regulatory Liabilities
Current	(106)	(1,597)
Public Service Company of New Mexico [Member] | Cost of removal [Member]
Regulatory Liabilities
Non-Current	(297,087)	(284,015)
Public Service Company of New Mexico [Member] | Deferred income taxes [Member]
Regulatory Liabilities
Non-Current	(62,920)	(77,502)
Public Service Company of New Mexico [Member] | AROs [Member]
Regulatory Liabilities
Non-Current	(30,621)	(33,747)
Public Service Company of New Mexico [Member] | Renewable energy [Member]
Regulatory Liabilities
Non-Current	(22,540)	(23,697)
Public Service Company of New Mexico [Member] | Nuclear spent fuel reimbursements [Member]
Regulatory Liabilities
Non-Current	(8,875)	(9,214)
Public Service Company of New Mexico [Member] | Pension and OPEB [Member]
Regulatory Liabilities
Non-Current	0	0
Public Service Company of New Mexico [Member] | Other [Member]
Regulatory Liabilities
Non-Current	(1,658)	(6,688)
Public Service Company of New Mexico [Member] | FPPAC [Member]
Regulatory Assets
Current	1,451	0
Public Service Company of New Mexico [Member] | Energy Efficiency [Member]
Regulatory Assets
Current	1,991	0
Public Service Company of New Mexico [Member] | Energy efficiency costs [Member]
Regulatory Assets
Current	0	0
Public Service Company of New Mexico [Member] | CTC, including carrying charges[Member]
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico [Member] | Coal mine reclamation costs [Member]
Regulatory Assets
Non-Current	22,383	28,303
Public Service Company of New Mexico [Member] | Deferred income taxes [Member]
Regulatory Assets
Non-Current	62,918	66,990
Public Service Company of New Mexico [Member] | Loss on reacquired debt [Member]
Regulatory Assets
Non-Current	24,404	23,627
Public Service Company of New Mexico [Member] | Pension and OPEB [Member]
Regulatory Assets
Non-Current	249,286	218,743
Public Service Company of New Mexico [Member] | AMS surcharge [Member]
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico [Member] | AMS retirement costs [Member]
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico [Member] | Other [Member]
Regulatory Assets
Non-Current	6,422	5,247
Texas-New Mexico Power Company [Member]
Regulatory Assets
Current	413	1,070
Non-Current	135,810	127,754
Total regulatory assets	136,223	128,824
Regulatory Liabilities
Current	(92)	0
Non-Current	(31,948)	(32,550)
Total regulatory liabilities	(32,040)	(32,550)
Texas-New Mexico Power Company [Member] | FPPAC [Member]
Regulatory Liabilities
Current	0	0
Texas-New Mexico Power Company [Member] | Renewable Energy Rider [Member]
Regulatory Liabilities
Current	0	0
Texas-New Mexico Power Company [Member] | Other Current [Member]
Regulatory Liabilities
Current	(92)	0
Texas-New Mexico Power Company [Member] | Cost of removal [Member]
Regulatory Liabilities
Non-Current	(26,900)	(26,859)
Texas-New Mexico Power Company [Member] | Deferred income taxes [Member]
Regulatory Liabilities
Non-Current	(2,644)	(3,283)
Texas-New Mexico Power Company [Member] | AROs [Member]
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company [Member] | Renewable energy [Member]
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company [Member] | Nuclear spent fuel reimbursements [Member]
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company [Member] | Pension and OPEB [Member]
Regulatory Liabilities
Non-Current	(1,955)	(1,913)
Texas-New Mexico Power Company [Member] | Other [Member]
Regulatory Liabilities
Non-Current	(449)	(495)
Texas-New Mexico Power Company [Member] | FPPAC [Member]
Regulatory Assets
Current	0	0
Texas-New Mexico Power Company [Member] | Energy Efficiency [Member]
Regulatory Assets
Current	413	629
Texas-New Mexico Power Company [Member] | Energy efficiency costs [Member]
Regulatory Assets
Current	0	441
Texas-New Mexico Power Company [Member] | CTC, including carrying charges[Member]
Regulatory Assets
Non-Current	36,328	46,147
Texas-New Mexico Power Company [Member] | Coal mine reclamation costs [Member]
Regulatory Assets
Non-Current	0	0
Texas-New Mexico Power Company [Member] | Deferred income taxes [Member]
Regulatory Assets
Non-Current	9,932	10,244
Texas-New Mexico Power Company [Member] | Loss on reacquired debt [Member]
Regulatory Assets
Non-Current	34,107	35,405
Texas-New Mexico Power Company [Member] | Pension and OPEB [Member]
Regulatory Assets
Non-Current	27,661	23,356
Texas-New Mexico Power Company [Member] | AMS surcharge [Member]
Regulatory Assets
Non-Current	14,669	1,673
Texas-New Mexico Power Company [Member] | AMS retirement costs [Member]
Regulatory Assets
Non-Current	11,086	8,549
Texas-New Mexico Power Company [Member] | Other [Member]
Regulatory Assets
Non-Current	$ 2,027	$ 2,380

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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