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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 473,220 $ 462,101 $ 904,310 $ 993,133
Alternative revenue programs 14,714 12,467 20,007 17,226
Other electric operating revenues 168 2,588 662 10,874
Total Electric Operating Revenues 488,102 477,156 924,979 1,021,233
PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 332,673 332,077 638,388 746,631
Alternative revenue programs 830 3,577 2,736 10,902
Other electric operating revenues 168 2,588 662 10,874
Total Electric Operating Revenues 333,671 338,242 641,786 768,407
TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 140,547 130,024 265,922 246,502
Alternative revenue programs 13,884 8,890 17,271 6,324
Other electric operating revenues 0 0 0 0
Total Electric Operating Revenues 154,431 138,914 283,193 252,826
Energy        
Disaggregation of Revenue [Line Items]        
Total Electric Operating Revenues 488,102 477,156 924,979 1,021,233
Energy | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 168,378 149,507 330,258 305,758
Energy | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 150,428 143,227 285,309 276,018
Energy | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 42,118 39,086 76,743 71,327
Energy | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6,956 6,974 13,070 13,011
Energy | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,033 10,731 11,595 20,041
Energy | PNM | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 121,065 108,016 241,450 227,901
Energy | PNM | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 109,929 105,262 209,266 203,323
Energy | PNM | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 34,201 26,156 58,970 45,633
Energy | PNM | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5,216 5,305 9,614 9,723
Energy | PNM | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,033 10,731 11,595 20,041
Energy | TNMP | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 47,313 41,491 88,808 77,857
Energy | TNMP | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 40,499 37,965 76,043 72,695
Energy | TNMP | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,917 12,930 17,773 25,694
Energy | TNMP | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,740 1,669 3,456 3,288
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 75,449 72,984 147,407 152,050
Transmission | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 33,333 37,922 69,482 86,930
Transmission | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 42,116 35,062 77,925 65,120
Wholesale energy sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23,507 37,308 35,197 150,294
Wholesale energy sales | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23,507 37,308 35,197 150,294
Wholesale energy sales | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Miscellaneous        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,351 2,284 4,731 4,634
Miscellaneous | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,389 1,377 2,814 2,786
Miscellaneous | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 962 $ 907 $ 1,917 $ 1,848