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Electric Operating Revenue Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 $ 1,377,208 $ 1,359,740 $ 1,321,023
Alternative revenue programs                 (542) 1,756 15,779
Other electric operating revenue                 80,937 75,117 108,201
Total electric operating revenues $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 343,756 $ 422,666 $ 352,313 $ 317,878 1,457,603 1,436,613 1,445,003
Electricity                      
Disaggregation of Revenue [Line Items]                      
Total electric operating revenues                 1,457,603 1,436,613 1,445,003
Transmission                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 124,162 121,271  
Miscellaneous                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 16,702 23,081  
Public Service Company of New Mexico                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 1,010,898 1,019,291 992,462
Alternative revenue programs                 1,987 (2,443) 3,567
Other electric operating revenue                 80,937 75,117 108,201
Total electric operating revenues 255,172 331,113 238,219 269,318 259,848 331,374 264,511 236,232 1,093,822 1,091,965 1,104,230
Public Service Company of New Mexico | Transmission                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 57,214 54,280  
Public Service Company of New Mexico | Miscellaneous                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 13,134 14,098  
Texas-New Mexico Power Company                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 366,310 340,449 328,561
Alternative revenue programs                 (2,529) 4,199 12,212
Other electric operating revenue                 0 0  
Total electric operating revenues $ 88,972 $ 102,473 $ 92,009 $ 80,327 $ 83,908 $ 91,292 $ 87,802 $ 81,646 363,781 344,648 $ 340,773
Texas-New Mexico Power Company | Transmission                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 66,948 66,991  
Texas-New Mexico Power Company | Miscellaneous                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 3,568 8,983  
Residential | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 578,625 563,297  
Residential | Public Service Company of New Mexico | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 427,883 433,009  
Residential | Texas-New Mexico Power Company | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 150,742 130,288  
Commercial | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 513,940 519,594  
Commercial | Public Service Company of New Mexico | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 396,987 408,333  
Commercial | Texas-New Mexico Power Company | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 116,953 111,261  
Industrial | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 92,006 78,436  
Industrial | Public Service Company of New Mexico | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 69,601 61,119  
Industrial | Texas-New Mexico Power Company | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 22,405 17,317  
Public authority | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 26,016 27,297  
Public authority | Public Service Company of New Mexico | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 20,322 21,688  
Public authority | Texas-New Mexico Power Company | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 5,694 5,609  
Economy energy service | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 25,757 26,764  
Economy energy service | Public Service Company of New Mexico | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 25,757 26,764  
Economy energy service | Texas-New Mexico Power Company | Electricity                      
Disaggregation of Revenue [Line Items]                      
Contracts with customers                 $ 0 $ 0