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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                      
Operating Expenses                 $ 1,314,732 $ 1,136,156 $ 1,101,081
Operating income $ (119,138) $ 121,505 $ 72,414 $ 49,569 $ 62,849 $ 116,799 $ 71,296 $ 48,753 124,350 299,697 286,842
Other Income and Deductions:                      
Other income                 26,833 12,048 10,572
Other (deductions)                 (12,728) (10,481) (21,552)
Net other income and deductions                 36,663 20,577 9,675
Earnings before Income Taxes                 46,153 200,647 175,069
Income Taxes                 15,075 69,738 59,513
Net Earnings Attributable to Company $ (91,418) $ 61,045 $ 31,673 $ 14,340 $ 18,992 $ 55,653 $ 29,141 $ 12,468 15,640 116,254 100,507
PNM Resources [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues                 0 0 0
Operating Expenses                 1,221 650 941
Operating income                 (1,221) (650) (941)
Other Income and Deductions:                      
Equity in earnings of subsidiaries                 27,352 124,543 116,634
Other income                 747 622 769
Other (deductions)                 (8,275) (13,650) (22,825)
Net other income and deductions                 19,824 111,515 94,578
Earnings before Income Taxes                 18,603 110,865 93,637
Income Taxes                 2,963 (5,389) (6,870)
Net Earnings Attributable to Company                 $ 15,640 $ 116,254 $ 100,507