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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 343,756 $ 422,666 $ 352,313 $ 317,878 $ 1,457,603 $ 1,436,613 $ 1,445,003
Operating Expenses                 1,313,403 1,200,566 1,129,964
Operating income 60,552 140,540 (93,615) 36,723 (17,404) 127,990 79,329 46,132 144,200 236,047 315,039
Other Income and Deductions:                      
Other income                 15,382 17,586 19,515
Net other income and deductions                 43,665 254 38,345
Interest charges                 121,016 127,244 127,625
Earnings before Income Taxes                 66,849 109,057 225,759
Income taxes (benefit)                 (25,282) 7,775 130,340
Net Earnings Attributable to Company $ 31,805 $ 102,771 $ (75,914) $ 18,700 $ (55,077) $ 87,521 $ 38,208 $ 14,990      
PNM Resources                      
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues                 0 0 0
Operating Expenses                 3,983 7,475 2,902
Operating income                 (3,983) (7,475) (2,902)
Other Income and Deductions:                      
Equity in earnings of subsidiaries                 96,324 109,995 111,877
Other income                 731 2,048 1,181
Net other income and deductions                 97,055 112,043 113,058
Interest charges                 19,581 19,453 12,490
Earnings before Income Taxes                 73,491 85,115 97,666
Income taxes (benefit)                 (3,872) (527) 17,792
Net Earnings Attributable to Company                 $ 77,363 $ 85,642 $ 79,874