Schedule I - Condensed Financial Information of Parent Company - Statements of Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Operating Revenues	$ 2,249,555	$ 1,779,873	$ 1,523,012
Operating Expenses	1,855,795	1,471,720	1,237,731
Operating income	393,760	308,153	285,281
Other Income and Deductions:
Other income	21,601	20,200	19,973
Net other income and (deductions)	(54,542)	33,153	37,063
Interest Charges	127,908	96,877	114,392
Earnings before Income Taxes	211,310	244,429	207,952
Income taxes (benefit)	26,130	32,582	20,636
PNM Resources
Condensed Financial Statements, Captions [Line Items]
Operating Revenues	0	0	0
Operating Expenses	6,199	15,044	28,299
Operating income	(6,199)	(15,044)	(28,299)
Other Income and Deductions:
Equity in earnings of subsidiaries	197,860	221,004	211,291
Other income	663	362	(269)
Net other income and (deductions)	198,523	221,366	211,022
Interest Charges	30,430	11,986	19,078
Earnings before Income Taxes	161,894	194,336	163,645
Income taxes (benefit)	(7,636)	(1,493)	(9,130)
Net earnings	$ 169,530	$ 195,829	$ 172,775