Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Current federal income tax	$ 0	$ 0	$ 0
Current state income tax	1,597	1,835	231
Deferred federal income tax	18,413	20,679	17,574
Deferred state income tax	7,302	11,315	3,721
Amortization of accumulated investment tax credits	(1,182)	(1,247)	(890)
Total income taxes	26,130	32,582	20,636
Public Service Company of New Mexico
Income Taxes [Line Items]
Current federal income tax	(13,533)	0	0
Current state income tax	3,244	(128)	(585)
Deferred federal income tax	25,298	18,774	20,125
Deferred state income tax	4,361	8,583	2,560
Amortization of accumulated investment tax credits	(172)	(237)	(243)
Total income taxes	19,198	26,992	21,857
Texas-New Mexico Power Company
Income Taxes [Line Items]
Current federal income tax	17,055	5,770	12,048
Current state income tax	2,662	2,395	2,033
Deferred federal income tax	(4,527)	(224)	(7,744)
Deferred state income tax	(29)	(29)	(29)
Total income taxes	$ 15,161	$ 7,912	$ 6,308