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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets
Current	$ 7,373	$ 4,534
Non-Current	556,930	598,930
Regulatory Liabilities
Current	(505)	(9,446)
Non-Current	(866,243)	(891,428)
Public Service Company of New Mexico
Regulatory Assets
Current	7,373	4,534
Non-Current	435,467	460,903
Total regulatory assets	442,840	465,437
Regulatory Liabilities
Current	(371)	(5,975)
Non-Current	(683,398)	(713,971)
Total regulatory liabilities	(683,769)	(719,946)
Public Service Company of New Mexico | Renewable energy rider
Regulatory Liabilities
Current	0	(4,475)
Public Service Company of New Mexico | Other
Regulatory Liabilities
Current	(371)	(1,500)
Public Service Company of New Mexico | Cost of removal
Regulatory Liabilities
Non-Current	(271,025)	(263,597)
Public Service Company of New Mexico | Deferred income taxes
Regulatory Liabilities
Non-Current	(374,122)	(407,978)
Public Service Company of New Mexico | PVNGS ARO
Regulatory Liabilities
Non-Current	(11,341)	(18,397)
Public Service Company of New Mexico | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	(19,069)	(20,226)
Public Service Company of New Mexico | Accelerated depreciation SNCRs
Regulatory Liabilities
Non-Current	(7,758)	(3,690)
Public Service Company of New Mexico | Pension and OPEB
Regulatory Liabilities
Non-Current	0	0
Public Service Company of New Mexico | Other
Regulatory Liabilities
Non-Current	(83)	(83)
Public Service Company of New Mexico | FPPAC
Regulatory Assets
Current	7,373	4,104
Public Service Company of New Mexico | Energy efficiency costs
Regulatory Assets
Current	0	430
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	13,995	19,915
Public Service Company of New Mexico | Deferred income taxes
Regulatory Assets
Non-Current	66,296	63,369
Public Service Company of New Mexico | Loss on reacquired debt
Regulatory Assets
Non-Current	19,426	21,085
Public Service Company of New Mexico | Pension and OPEB
Regulatory Assets
Non-Current	214,771	227,400
Public Service Company of New Mexico | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	113,508	119,785
Public Service Company of New Mexico | Hurricane recovery costs
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 | Renewable energy tax benefits
Regulatory Assets
Non-Current	643	0
Public Service Company of New Mexico | Other
Regulatory Assets
Non-Current	6,828	9,349
Texas-New Mexico Power Company
Regulatory Assets
Current	0	0
Non-Current	121,463	138,027
Total regulatory assets	121,463	138,027
Regulatory Liabilities
Current	(134)	(3,471)
Non-Current	(182,845)	(177,458)
Total regulatory liabilities	(182,979)	(180,929)
Texas-New Mexico Power Company | Renewable energy rider
Regulatory Liabilities
Current	0	0
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Current	(134)	(3,471)
Texas-New Mexico Power Company | Cost of removal
Regulatory Liabilities
Non-Current	(46,091)	(29,637)
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Liabilities
Non-Current	(131,871)	(143,745)
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 | Accelerated depreciation SNCRs
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Pension and OPEB
Regulatory Liabilities
Non-Current	(4,775)	(3,940)
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Non-Current	(108)	(136)
Texas-New Mexico Power Company | FPPAC
Regulatory Assets
Current	0	0
Texas-New Mexico Power Company | Energy efficiency costs
Regulatory Assets
Current	0	0
Texas-New Mexico Power Company | CTC, including carrying charges
Regulatory Assets
Non-Current	7,412	17,744
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	8,997	9,309
Texas-New Mexico Power Company | Loss on reacquired debt
Regulatory Assets
Non-Current	30,212	31,510
Texas-New Mexico Power Company | Pension and OPEB
Regulatory Assets
Non-Current	27,947	26,972
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
Regulatory Assets
Non-Current	1,041	1,551
Texas-New Mexico Power Company | AMS surcharge
Regulatory Assets
Non-Current	25,015	31,435
Texas-New Mexico Power Company | AMS retirement and other costs
Regulatory Assets
Non-Current	15,542	16,489
Texas-New Mexico Power Company | Renewable energy tax benefits
Regulatory Assets
Non-Current	0	0
Texas-New Mexico Power Company | Other
Regulatory Assets
Non-Current	5,297	3,017
Accounting Standards Update 2017-07 | Public Service Company of New Mexico
Regulatory Liabilities
Non-service cost deferred as regulatory assets	700
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		$ 9,400

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