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Segment Information - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 317,878 $ 330,178  
Cost of energy 92,556 102,804  
Utility margin 225,322 227,374  
Other operating expenses 120,468 112,893  
Depreciation and amortization 58,722 56,383  
Operating income 46,132 58,098  
Interest income 4,124 4,881  
Other income (deductions) 2,381 5,942  
Interest charges (33,055) (31,700)  
Earnings before Income Taxes 19,582 37,221  
Income taxes (benefit) 783 10,775  
Net Earnings 18,799 26,446  
Valencia non-controlling interest (3,677) (3,452)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 14,990 22,862  
Total Assets 6,676,393 6,477,679 $ 6,646,103
Goodwill 278,297 278,297 $ 278,297
PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 236,232 251,558  
Cost of energy 70,802 81,317  
Utility margin 165,430 170,241  
Other operating expenses 100,511 93,756  
Depreciation and amortization 36,627 36,016  
Operating income 28,292 40,469  
Interest income 2,487 2,816  
Other income (deductions) 1,217 5,545  
Interest charges (20,830) (21,012)  
Earnings before Income Taxes 11,166 27,818  
Income taxes (benefit) (348) 7,708  
Net Earnings 11,514 20,110  
Valencia non-controlling interest (3,677) (3,452)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 7,705 16,526  
Total Assets 4,925,741 4,870,201  
Goodwill 51,632 51,632  
TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 81,646 78,620  
Cost of energy 21,754 21,487  
Utility margin 59,892 57,133  
Other operating expenses 24,973 23,797  
Depreciation and amortization 16,387 15,371  
Operating income 18,532 17,965  
Interest income 0 0  
Other income (deductions) 1,085 732  
Interest charges (7,729) (7,404)  
Earnings before Income Taxes 11,888 11,293  
Income taxes (benefit) 2,475 3,689  
Net Earnings 9,413 7,604  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock 9,413 7,604  
Total Assets 1,526,434 1,396,055  
Goodwill 226,665 226,665  
Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0 0  
Cost of energy 0 0  
Utility margin 0 0  
Other operating expenses (5,016) (4,660)  
Depreciation and amortization 5,708 4,996  
Operating income (692) (336)  
Interest income 1,637 2,065  
Other income (deductions) 79 (335)  
Interest charges (4,496) (3,284)  
Earnings before Income Taxes (3,472) (1,890)  
Income taxes (benefit) (1,344) (622)  
Net Earnings (2,128) (1,268)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock (2,128) (1,268)  
Total Assets 224,218 211,423  
Goodwill $ 0 $ 0