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Segment Information - Schedule of Gross Margin (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Gross margin $ 177,178 $ 269,221 $ 545,516 $ 593,647
Transmission and distribution costs 25,078 21,538 72,739 61,160
Depreciation and amortization 72,894 70,321 216,033 210,046
Utility margin 295,538 395,549 902,633 975,387
Energy Production        
Segment Reporting Information [Line Items]        
Energy production costs 20,388 34,469 68,345 110,534
Public Service Company of New Mexico        
Segment Reporting Information [Line Items]        
Gross margin 95,721 201,607 356,317 421,327
Transmission and distribution costs 15,326 12,549 43,968 37,678
Depreciation and amortization 44,537 45,361 132,287 137,132
Utility margin 175,972 293,986 600,917 706,671
Public Service Company of New Mexico | Energy Production        
Segment Reporting Information [Line Items]        
Energy production costs 20,388 34,469 68,345 110,534
Texas-New Mexico Power Company        
Segment Reporting Information [Line Items]        
Gross margin 81,457 67,614 189,199 172,320
Transmission and distribution costs 9,752 8,989 28,771 23,482
Depreciation and amortization 28,357 24,960 83,746 72,914
Utility margin 119,566 101,563 301,716 268,716
Texas-New Mexico Power Company | Energy Production        
Segment Reporting Information [Line Items]        
Energy production costs 0 0 0 0
Corporate and Other        
Segment Reporting Information [Line Items]        
Gross margin 0 0 0 0
Transmission and distribution costs 0 0 0 0
Depreciation and amortization 0 0 0 0
Utility margin 0 0 0 0
Corporate and Other | Energy Production        
Segment Reporting Information [Line Items]        
Energy production costs $ 0 $ 0 $ 0 $ 0