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Segment Information - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 330,178 $ 310,961  
Cost of energy 102,804 92,369  
Utility margin 227,374 218,592  
Other operating expenses 115,031 127,255  
Depreciation and amortization 56,383 49,829  
Operating income 55,960 41,508  
Interest income 4,881 3,622  
Other income (deductions) 8,080 7,483  
Interest charges (31,700) (31,491)  
Earnings before Income Taxes 37,221 21,122  
Income taxes (benefit) 10,775 7,157  
Net Earnings 26,446 13,965  
Valencia non-controlling interest (3,452) (3,287)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 22,862 10,546  
Total Assets 6,477,679 6,273,812 $ 6,471,080
Goodwill 278,297 278,297 $ 278,297
PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 251,558 235,606  
Cost of energy 81,317 72,444  
Utility margin 170,241 163,162  
Other operating expenses 95,894 108,001  
Depreciation and amortization 36,016 31,864  
Operating income 38,331 23,297  
Interest income 2,816 1,522  
Other income (deductions) 7,683 7,943  
Interest charges (21,012) (21,591)  
Earnings before Income Taxes 27,818 11,171  
Income taxes (benefit) 7,708 3,610  
Net Earnings 20,110 7,561  
Valencia non-controlling interest (3,452) (3,287)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 16,526 4,142  
Total Assets 4,870,201 4,719,346  
Goodwill 51,632 51,632  
TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 78,620 75,355  
Cost of energy 21,487 19,925  
Utility margin 57,133 55,430  
Other operating expenses 23,797 22,368  
Depreciation and amortization 15,371 14,508  
Operating income 17,965 18,554  
Interest income 0 0  
Other income (deductions) 732 608  
Interest charges (7,404) (7,369)  
Earnings before Income Taxes 11,293 11,793  
Income taxes (benefit) 3,689 4,337  
Net Earnings 7,604 7,456  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock 7,604 7,456  
Total Assets 1,396,055 1,312,402  
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 (4,660) (3,114)  
Depreciation and amortization 4,996 3,457  
Operating income (336) (343)  
Interest income 2,065 2,100  
Other income (deductions) (335) (1,068)  
Interest charges (3,284) (2,531)  
Earnings before Income Taxes (1,890) (1,842)  
Income taxes (benefit) (622) (790)  
Net Earnings (1,268) (1,052)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock (1,268) (1,052)  
Total Assets 211,423 242,064  
Goodwill $ 0 $ 0