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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets
Current	$ 4,534	$ 2,933
Non-Current	598,930	600,672
Regulatory Liabilities
Current	(9,446)	(2,309)
Non-Current	(891,428)	(933,578)
Public Service Company of New Mexico
Regulatory Assets
Current	4,534	2,139
Non-Current	460,903	459,239
Total regulatory assets	465,437	461,378
Regulatory Liabilities
Current	(5,975)	(784)
Non-Current	(713,971)	(754,441)
Total regulatory liabilities	(719,946)	(755,225)
Public Service Company of New Mexico | Renewable energy rider
Regulatory Liabilities
Current	(4,475)	(779)
Public Service Company of New Mexico | Other
Regulatory Liabilities
Current	(1,500)	(5)
Public Service Company of New Mexico | Cost of removal
Regulatory Liabilities
Non-Current	(263,597)	(256,493)
Public Service Company of New Mexico | Deferred income taxes
Regulatory Liabilities
Non-Current	(407,978)	(445,390)
Public Service Company of New Mexico | PVNGS ARO
Regulatory Liabilities
Non-Current	(18,397)	(24,889)
Public Service Company of New Mexico | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	(20,226)	(21,383)
Public Service Company of New Mexico | Nuclear spent fuel reimbursements
Regulatory Liabilities
Non-Current	0	(5,518)
Public Service Company of New Mexico | Accelerated depreciation SNCRs
Regulatory Liabilities
Non-Current	(3,690)	0
Public Service Company of New Mexico | Pension and OPEB(1)
Regulatory Liabilities
Non-Current	0	0
Public Service Company of New Mexico | Other
Regulatory Liabilities
Non-Current	(83)	(768)
Public Service Company of New Mexico | FPPAC
Regulatory Assets
Current	4,104	363
Public Service Company of New Mexico | Energy efficiency costs
Regulatory Assets
Current	430	1,776
Public Service Company of New Mexico | CTC, including carrying charges
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | Coal mine reclamation costs
Regulatory Assets
Non-Current	19,915	16,462
Public Service Company of New Mexico | Deferred income taxes
Regulatory Assets
Non-Current	63,369	59,220
Public Service Company of New Mexico | Loss on reacquired debt
Regulatory Assets
Non-Current	21,085	22,744
Public Service Company of New Mexico | Pension and OPEB(1)
Regulatory Assets
Non-Current	227,400	222,774
Public Service Company of New Mexico | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	119,785	125,539
Public Service Company of New Mexico | Hurricane recovery costs(2)
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | AMS surcharge
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | AMS retirement and other costs
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | Other
Regulatory Assets
Non-Current	9,349	12,500
Texas-New Mexico Power Company
Regulatory Assets
Current	0	794
Non-Current	138,027	141,433
Total regulatory assets	138,027	142,227
Regulatory Liabilities
Current	(3,471)	(1,525)
Non-Current	(177,458)	(179,137)
Total regulatory liabilities	(180,929)	(180,662)
Texas-New Mexico Power Company | Renewable energy rider
Regulatory Liabilities
Current	0	0
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Current	(3,471)	(1,525)
Texas-New Mexico Power Company | Cost of removal
Regulatory Liabilities
Non-Current	(29,637)	(26,541)
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Liabilities
Non-Current	(143,745)	(148,455)
Texas-New Mexico Power Company | PVNGS ARO
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Nuclear spent fuel reimbursements
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Accelerated depreciation SNCRs
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Pension and OPEB(1)
Regulatory Liabilities
Non-Current	(3,940)	(3,442)
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Non-Current	(136)	(699)
Texas-New Mexico Power Company | FPPAC
Regulatory Assets
Current	0	0
Texas-New Mexico Power Company | Energy efficiency costs
Regulatory Assets
Current	0	794
Texas-New Mexico Power Company | CTC, including carrying charges
Regulatory Assets
Non-Current	17,744	26,998
Texas-New Mexico Power Company | Coal mine reclamation costs
Regulatory Assets
Non-Current	0	0
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Assets
Non-Current	9,309	9,621
Texas-New Mexico Power Company | Loss on reacquired debt
Regulatory Assets
Non-Current	31,510	32,808
Texas-New Mexico Power Company | Pension and OPEB(1)
Regulatory Assets
Non-Current	26,972	26,153
Texas-New Mexico Power Company | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	0	0
Texas-New Mexico Power Company | Hurricane recovery costs(2)
Regulatory Assets
Non-Current	1,551	6,640
Texas-New Mexico Power Company | AMS surcharge
Regulatory Assets
Non-Current	31,435	27,903
Texas-New Mexico Power Company | AMS retirement and other costs
Regulatory Assets
Non-Current	16,489	8,948
Texas-New Mexico Power Company | Other
Regulatory Assets
Non-Current	3,017	$ 2,362
Accounting Standards Update 2017-07 | Public Service Company of New Mexico
Regulatory Assets and Liabilities [Line Items]
Non-service cost deferred as regulatory assets	400
Accounting Standards Update 2017-07 | Texas-New Mexico Power Company
Regulatory Liabilities
Non-service cost deferred as regulatory liability	$ 100

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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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