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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 364,707 $ 333,622  
Other operating expenses 136,271 118,201  
Depreciation and amortization 69,874 68,973  
Operating income 43,166 47,738  
Interest income 3,559 3,423  
Other income (deductions) 1,930 (34,006)  
Interest charges (25,884) (30,434)  
Earnings (Loss) before Income Taxes 22,771 (13,279)  
Income taxes (benefit) 1,566 (1,880)  
Net Earnings (Loss) 21,205 (11,399)  
Valencia non-controlling interest (3,494) (3,729)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings (Loss) Available for PNM Common Stock 17,579 (15,260)  
Total Assets 7,943,309 7,375,119 $ 7,939,854
Goodwill 278,297 278,297 $ 278,297
PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Other operating expenses 107,328 98,555  
Depreciation and amortization 41,949 41,449  
Operating income 33,050 33,605  
Interest income 3,595 3,496  
Other income (deductions) 1,244 (34,027)  
Interest charges (12,893) (17,629)  
Earnings (Loss) before Income Taxes 24,996 (14,555)  
Income taxes (benefit) 2,834 (2,359)  
Net Earnings (Loss) 22,162 (12,196)  
Valencia non-controlling interest (3,494) (3,729)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings (Loss) Available for PNM Common Stock 18,536 (16,057)  
Total Assets 5,561,146 5,260,528  
Goodwill 51,632 51,632  
TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Other operating expenses 27,769 25,122  
Depreciation and amortization 22,190 21,836  
Operating income 17,025 14,345  
Interest income 0 0  
Other income (deductions) 1,062 561  
Interest charges (8,475) (7,172)  
Earnings (Loss) before Income Taxes 9,612 7,734  
Income taxes (benefit) 877 642  
Net Earnings (Loss) 8,735 7,092  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings (Loss) Available for PNM Common Stock 8,735 7,092  
Total Assets 2,163,250 1,913,270  
Goodwill 226,665 226,665  
Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Other operating expenses 1,174 (5,476)  
Depreciation and amortization 5,735 5,688  
Operating income (6,909) (212)  
Interest income (36) (73)  
Other income (deductions) (376) (540)  
Interest charges (4,516) (5,633)  
Earnings (Loss) before Income Taxes (11,837) (6,458)  
Income taxes (benefit) (2,145) (163)  
Net Earnings (Loss) (9,692) (6,295)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings (Loss) Available for PNM Common Stock (9,692) (6,295)  
Total Assets 218,913 201,321  
Goodwill 0 0  
Cost of energy      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 364,707 333,622  
Cost of energy 115,396 98,710  
Utility margin 249,311 234,912  
Cost of energy | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 271,213 248,133  
Cost of energy 88,886 74,524  
Utility margin 182,327 173,609  
Cost of energy | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 93,494 85,489  
Cost of energy 26,510 24,186  
Utility margin 66,984 61,303  
Cost of energy | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0 0  
Cost of energy 0 0  
Utility margin $ 0 $ 0