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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 481,881 $ 455,120 $ 1,197,359 $ 1,121,177
Alternative revenue programs (9,483) (12,376) (3,156) (7,484)
Other electric operating revenue 82,153 29,721 151,595 50,043
Revenues 554,551 472,465 1,345,798 1,163,736
PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 361,701 341,850 884,559 825,759
Alternative revenue programs (8,331) (7,067) (5,469) (2,377)
Other electric operating revenue 82,153 29,721 151,595 50,043
Revenues 435,523 364,504 1,030,685 873,425
TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 120,180 113,270 312,800 295,418
Alternative revenue programs (1,152) (5,309) 2,313 (5,107)
Other electric operating revenue 0 0 0 0
Revenues 119,028 107,961 315,113 290,311
Cost of energy        
Disaggregation of Revenue [Line Items]        
Revenues 554,551 472,465 1,345,798 1,163,736
Cost of energy | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 206,874 211,663 499,394 492,763
Cost of energy | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 171,505 156,491 420,422 392,995
Cost of energy | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 32,138 32,317 88,214 85,545
Cost of energy | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 9,002 9,450 21,873 21,547
Cost of energy | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,389 3,270 24,722 11,802
Cost of energy | PNM | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 155,035 158,549 377,794 370,448
Cost of energy | PNM | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 137,071 125,414 327,090 305,127
Cost of energy | PNM | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 24,856 25,475 66,593 65,313
Cost of energy | PNM | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,388 7,982 17,312 17,236
Cost of energy | PNM | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,389 3,270 24,722 11,802
Cost of energy | TNMP | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 51,839 53,114 121,600 122,315
Cost of energy | TNMP | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 34,434 31,077 93,332 87,868
Cost of energy | TNMP | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,282 6,842 21,621 20,232
Cost of energy | TNMP | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,614 1,468 4,561 4,311
Cost of energy | TNMP | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 50,534 37,308 129,768 103,822
Transmission | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 26,459 17,463 60,919 45,727
Transmission | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 24,075 19,845 68,849 58,095
Miscellaneous        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,439 4,621 12,966 12,703
Miscellaneous | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3,503 3,697 10,129 10,106
Miscellaneous | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 936 $ 924 $ 2,837 $ 2,597