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Electric Operating Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Contracts with customers $ 1,569,405 $ 1,469,799 $ 1,377,208
Alternative revenue programs (3,764) (11,994) (542)
Other electric operating revenue 214,232 65,207 80,937
Total electric operating revenues 1,779,873 1,523,012 1,457,603
Electricity      
Disaggregation of Revenue [Line Items]      
Total electric operating revenues 1,779,873 1,523,012 1,457,603
Transmission      
Disaggregation of Revenue [Line Items]      
Contracts with customers 182,032 138,230 124,162
Miscellaneous      
Disaggregation of Revenue [Line Items]      
Contracts with customers 17,420 17,049 16,702
Public Service Company of New Mexico      
Disaggregation of Revenue [Line Items]      
Contracts with customers 1,151,896 1,078,158 1,010,898
Alternative revenue programs (4,108) (3,531) 1,987
Other electric operating revenue 214,232 65,207 80,937
Total electric operating revenues 1,362,020 1,139,834 1,093,822
Public Service Company of New Mexico | Transmission      
Disaggregation of Revenue [Line Items]      
Contracts with customers 87,880 59,856 57,214
Public Service Company of New Mexico | Miscellaneous      
Disaggregation of Revenue [Line Items]      
Contracts with customers 13,626 13,311 13,134
Texas-New Mexico Power Company      
Disaggregation of Revenue [Line Items]      
Contracts with customers 417,509 391,641 366,310
Alternative revenue programs 344 (8,463) (2,529)
Other electric operating revenue 0 0 0
Total electric operating revenues 417,853 383,178 363,781
Texas-New Mexico Power Company | Transmission      
Disaggregation of Revenue [Line Items]      
Contracts with customers 94,152 78,374 66,948
Texas-New Mexico Power Company | Miscellaneous      
Disaggregation of Revenue [Line Items]      
Contracts with customers 3,794 3,738 3,568
Residential | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 643,516 640,918 578,625
Residential | Public Service Company of New Mexico | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 484,720 482,852 427,883
Residential | Texas-New Mexico Power Company | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 158,796 158,066 150,742
Commercial | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 544,787 510,500 513,940
Commercial | Public Service Company of New Mexico | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 419,251 392,257 396,987
Commercial | Texas-New Mexico Power Company | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 125,536 118,243 116,953
Industrial | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 117,568 118,212 92,006
Industrial | Public Service Company of New Mexico | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 88,479 90,845 69,601
Industrial | Texas-New Mexico Power Company | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 29,089 27,367 22,405
Public authority | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 28,862 28,979 26,016
Public authority | Public Service Company of New Mexico | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 22,720 23,126 20,322
Public authority | Texas-New Mexico Power Company | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 6,142 5,853 5,694
Economy energy service | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 35,220 15,911 25,757
Economy energy service | Public Service Company of New Mexico | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers 35,220 15,911 25,757
Economy energy service | Texas-New Mexico Power Company | Electricity      
Disaggregation of Revenue [Line Items]      
Contracts with customers $ 0 $ 0 $ 0