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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 509,923 $ 740,978 $ 1,503,056 $ 1,670,631
Alternative revenue programs (4,977) (11,643) 12,249 (14,569)
Other electric operating revenue 905 553 11,779 17,674
Electric Operating Revenues 505,851 729,888 1,527,084 1,673,736
PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 350,368 597,383 1,096,999 1,294,087
Alternative revenue programs (939) (599) 9,963 1,039
Other electric operating revenue 905 553 11,779 17,674
Electric Operating Revenues 350,334 597,337 1,118,741 1,312,800
TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 159,555 143,595 406,057 376,544
Alternative revenue programs (4,038) (11,044) 2,286 (15,608)
Other electric operating revenue 0 0 0 0
Electric Operating Revenues 155,517 132,551 408,343 360,936
Energy        
Disaggregation of Revenue [Line Items]        
Electric Operating Revenues 505,851 729,888 1,527,084 1,673,736
Energy | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 180,962 211,561 486,720 514,526
Energy | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 147,899 178,019 423,917 436,857
Energy | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 30,556 35,059 101,883 95,739
Energy | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,807 8,613 20,818 20,869
Energy | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,958 11,784 24,999 31,726
Energy | PNM | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 111,406 150,683 339,307 368,159
Energy | PNM | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 106,237 136,314 309,560 325,492
Energy | PNM | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 19,891 25,609 65,524 68,351
Energy | PNM | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6,099 6,893 15,822 16,063
Energy | PNM | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,958 11,784 24,999 31,726
Energy | TNMP | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 69,556 60,878 147,413 146,367
Energy | TNMP | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 41,662 41,705 114,357 111,365
Energy | TNMP | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 10,665 9,450 36,359 27,388
Energy | TNMP | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,708 1,720 4,996 4,806
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 72,446 73,394 224,496 198,430
Transmission | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 37,466 44,513 124,396 114,699
Transmission | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 34,980 28,881 100,100 83,731
Wholesale energy sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 62,804 220,219 213,098 365,554
Wholesale energy sales | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 62,804 220,219 213,098 365,554
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 2,491 2,329 7,125 6,930
Miscellaneous | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,507 1,368 4,293 4,043
Miscellaneous | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 984 $ 961 $ 2,832 $ 2,887