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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets
Current	$ 202	$ 202	$ 7,373
Non-Current	557,790	557,790	556,930
Regulatory Liabilities
Current	(7,471)	(7,471)	(505)
Non-Current	(850,228)	(850,228)	(866,243)
Public Service Company of New Mexico
Regulatory Assets
Current	0	0	7,373
Non-Current	457,953	457,953	435,467
Total regulatory assets	457,953	457,953	442,840
Regulatory Liabilities
Current	(5,419)	(5,419)	(371)
Non-Current	(664,873)	(664,873)	(683,398)
Total regulatory liabilities	(670,292)	(670,292)	(683,769)
Public Service Company of New Mexico | FPPAC
Regulatory Liabilities
Current	(2,274)	(2,274)	0
Public Service Company of New Mexico | Renewable Energy Rider
Regulatory Liabilities
Current	(2,044)	(2,044)	0
Public Service Company of New Mexico | Other
Regulatory Liabilities
Current	(1,101)	(1,101)	(371)
Public Service Company of New Mexico | Cost of removal
Regulatory Liabilities
Non-Current	(284,695)	(284,695)	(271,025)
Public Service Company of New Mexico | Deferred income taxes
Regulatory Liabilities
Non-Current	(343,844)	(343,844)	(374,122)
Public Service Company of New Mexico | PVNGS ARO
Regulatory Liabilities
Non-Current	(5,394)	(5,394)	(11,341)
Public Service Company of New Mexico | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	(17,912)	(17,912)	(19,069)
Public Service Company of New Mexico | Accelerated depreciation SNCRs(4)
Regulatory Liabilities
Non-Current	(12,045)	(12,045)	(7,758)
Public Service Company of New Mexico | Pension and OPEB
Regulatory Liabilities
Non-Current	0	0	0
Public Service Company of New Mexico | COVID-19 cost savings
Regulatory Liabilities
Non-Current	(900)	(900)	0
Public Service Company of New Mexico | Other
Regulatory Liabilities
Non-Current	(83)	(83)	(83)
Public Service Company of New Mexico | FPPAC
Regulatory Assets
Current	0	0	7,373
Public Service Company of New Mexico | Energy efficiency costs
Regulatory Assets
Current	0	0	0
Public Service Company of New Mexico | CTC, including carrying charges
Regulatory Assets
Non-Current	0	0	0
Public Service Company of New Mexico | Coal mine reclamation costs
Regulatory Assets
Non-Current	9,980	9,980	13,995
Public Service Company of New Mexico | Deferred income taxes
Regulatory Assets
Non-Current	65,564	65,564	66,296
Public Service Company of New Mexico | Loss on reacquired debt
Regulatory Assets
Non-Current	19,748	19,748	19,426
Public Service Company of New Mexico | Pension and OPEB
Regulatory Assets
Non-Current	190,147	190,147	214,771
Public Service Company of New Mexico | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	107,231	107,231	113,508
Public Service Company of New Mexico | Hurricane recovery costs
Regulatory Assets
Non-Current	0	0	0
Public Service Company of New Mexico | AMS surcharge
Regulatory Assets
Non-Current	0	0	0
Public Service Company of New Mexico | AMS retirement and other costs
Regulatory Assets
Non-Current	0	0	0
Public Service Company of New Mexico | Renewable energy tax benefits
Regulatory Assets
Non-Current	0	0	643
Public Service Company of New Mexico | Deferred cost under the ETA
Regulatory Assets
Non-Current	42,703	42,703	0
Public Service Company of New Mexico | Deferred COVID-19 costs
Regulatory Assets
Non-Current	8,761	8,761	0
Public Service Company of New Mexico | SJGS replacement resources
Regulatory Assets
Non-Current	8,282	8,282	0
Public Service Company of New Mexico | Other
Regulatory Assets
Non-Current	5,537	5,537	6,828
Texas-New Mexico Power Company
Regulatory Assets
Current	202	202	0
Non-Current	99,837	99,837	121,463
Total regulatory assets	100,039	100,039	121,463
Regulatory Liabilities
Current	(2,052)	(2,052)	(134)
Non-Current	(185,355)	(185,355)	(182,845)
Total regulatory liabilities	(187,407)	(187,407)	(182,979)
Texas-New Mexico Power Company | FPPAC
Regulatory Liabilities
Current	0	0	0
Texas-New Mexico Power Company | Renewable Energy Rider
Regulatory Liabilities
Current	0	0	0
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Current	(2,052)	(2,052)	(134)
Texas-New Mexico Power Company | Cost of removal
Regulatory Liabilities
Non-Current	(59,613)	(59,613)	(46,091)
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Liabilities
Non-Current	(119,695)	(119,695)	(131,871)
Texas-New Mexico Power Company | PVNGS ARO
Regulatory Liabilities
Non-Current	0	0	0
Texas-New Mexico Power Company | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	0	0	0
Texas-New Mexico Power Company | Accelerated depreciation SNCRs(4)
Regulatory Liabilities
Non-Current	0	0	0
Texas-New Mexico Power Company | Pension and OPEB
Regulatory Liabilities
Non-Current	(5,535)	(5,535)	(4,775)
Texas-New Mexico Power Company | COVID-19 cost savings
Regulatory Liabilities
Non-Current	0	0	0
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Non-Current	(512)	(512)	(108)
Texas-New Mexico Power Company | FPPAC
Regulatory Assets
Current	0	0	0
Texas-New Mexico Power Company | Energy efficiency costs
Regulatory Assets
Current	202	202	0
Texas-New Mexico Power Company | CTC, including carrying charges
Regulatory Assets
Non-Current	324	324	7,412
Texas-New Mexico Power Company | Coal mine reclamation costs
Regulatory Assets
Non-Current	0	0	0
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Assets
Non-Current	9,817	9,817	8,997
Texas-New Mexico Power Company | Loss on reacquired debt
Regulatory Assets
Non-Current	28,914	28,914	30,212
Texas-New Mexico Power Company | Pension and OPEB
Regulatory Assets
Non-Current	22,863	22,863	27,947
Texas-New Mexico Power Company | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	0	0	0
Texas-New Mexico Power Company | Hurricane recovery costs
Regulatory Assets
Non-Current	480	480	1,041
Texas-New Mexico Power Company | AMS surcharge
Regulatory Assets
Non-Current	18,761	18,761	25,015
Texas-New Mexico Power Company | AMS retirement and other costs
Regulatory Assets
Non-Current	13,915	13,915	15,542
Texas-New Mexico Power Company | Renewable energy tax benefits
Regulatory Assets
Non-Current	0	0	0
Texas-New Mexico Power Company | Deferred cost under the ETA
Regulatory Assets
Non-Current	0	0	0
Texas-New Mexico Power Company | Deferred COVID-19 costs
Regulatory Assets
Non-Current	676	676	0
Texas-New Mexico Power Company | SJGS replacement resources
Regulatory Assets
Non-Current	0	0	0
Texas-New Mexico Power Company | Other
Regulatory Assets
Non-Current	4,087	4,087	5,297
Accounting Standards Update 2017-07 | Public Service Company of New Mexico
Regulatory Liabilities
Non-service cost deferred as regulatory assets		$ 1,600
Increase in coal mine decommissioning liability | Public Service Company of New Mexico
Regulatory Liabilities
Net expense			800
Increase in coal mine decommissioning liability | Underground | Public Service Company of New Mexico
Regulatory Liabilities
Net expense	$ 100		$ 9,300	$ 9,400

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Regulatory Disallowance, Additional amount recorded

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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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