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Schedule I - Condensed Financial Information of Parent Company - Statements of Earnings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Operating Revenues $ 1,779,873 $ 1,523,012 $ 1,457,603
Operating Expenses 1,471,720 1,237,731 1,313,403
Operating income 308,153 285,281 144,200
Other Income and Deductions:      
Other income 20,200 19,973 15,382
Net other income and (deductions) 33,153 37,063 43,665
Interest Charges 96,877 114,392 121,016
Earnings before Income Taxes 244,429 207,952 66,849
Income taxes (benefit) 32,582 20,636 (25,282)
PNM Resources      
Condensed Financial Statements, Captions [Line Items]      
Operating Revenues 0 0 0
Operating Expenses 15,044 28,299 3,983
Operating income (15,044) (28,299) (3,983)
Other Income and Deductions:      
Equity in earnings of subsidiaries 221,004 211,291 96,324
Other income 362 (269) 731
Net other income and (deductions) 221,366 211,022 97,055
Interest Charges 11,986 19,078 19,581
Earnings before Income Taxes 194,336 163,645 73,491
Income taxes (benefit) (1,493) (9,130) (3,872)
Net earnings $ 195,829 $ 172,775 $ 77,363