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Schedule I - Condensed Financial Information of Parent Company - Statements of Earnings (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues $ 359,276 $ 472,465 $ 357,649 $ 333,622 $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 1,523,012 $ 1,457,603 $ 1,436,613
Operating Expenses                 1,237,731 1,313,403 1,200,566
Operating income 18,588 147,805 71,150 47,738 60,552 140,540 (93,615) 36,723 285,281 144,200 236,047
Other Income and Deductions:                      
Other income                 19,973 15,382 17,586
Net other income and (deductions)                 37,063 43,665 254
Interest Charges                 114,392 121,016 127,244
Earnings before Income Taxes                 207,952 66,849 109,057
Income taxes (benefit)                 20,636 (25,282) 7,775
Net earnings $ 8,778 $ 121,768 $ 57,489 $ (15,260) $ 31,805 $ 102,771 $ (75,914) $ 18,700      
PNM Resources                      
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues                 0 0 0
Operating Expenses                 28,299 3,983 7,475
Operating income                 (28,299) (3,983) (7,475)
Other Income and Deductions:                      
Equity in earnings of subsidiaries                 211,291 96,324 109,995
Other income                 (269) 731 2,048
Net other income and (deductions)                 211,022 97,055 112,043
Interest Charges                 19,078 19,581 19,453
Earnings before Income Taxes                 163,645 73,491 85,115
Income taxes (benefit)                 (9,130) (3,872) (527)
Net earnings                 $ 172,775 $ 77,363 $ 85,642