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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues                 $ 1,436,613 $ 1,445,003 $ 1,362,951
Operating Expenses                 1,200,566 1,129,964 1,078,226
Operating income $ (17,404) $ 127,990 $ 79,329 $ 46,132 $ 22,936 $ 142,484 $ 85,105 $ 55,960 236,047 315,039 284,725
Other Income and Deductions:                      
Other income                 17,586 19,515 17,796
Net other income and deductions                 254 38,345 39,082
Interest charges                 127,244 127,625 128,633
Earnings before Income Taxes                 109,057 225,759 195,174
Income Taxes                 7,775 130,340 63,278
Net Earnings Attributable to Company $ (55,077) $ 87,521 $ 38,208 $ 14,990 $ (54,282) $ 73,739 $ 37,555 $ 22,862      
PNM Resources                      
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues                 0 0 0
Operating Expenses                 7,475 2,902 2,871
Operating income                 (7,475) (2,902) (2,871)
Other Income and Deductions:                      
Equity in earnings of subsidiaries                 109,995 111,877 122,252
Other income                 2,048 1,181 1,711
Net other income and deductions                 112,043 113,058 123,963
Interest charges                 19,453 12,490 8,102
Earnings before Income Taxes                 85,115 97,666 112,990
Income Taxes                 (527) 17,792 (3,859)
Net Earnings Attributable to Company                 $ 85,642 $ 79,874 $ 116,849