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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 44,375 $ 51,330 $ 43,670
Amortization of accumulated investment tax credits (1,182) (1,247) (890)
Amortization of excess deferred income tax (23,599) (24,484) (30,723)
Flow-through of depreciation items 2,795 798 1,368
(Earnings) attributable to non-controlling interest in Valencia (3,176) (3,253) (2,943)
State income tax, net of federal (benefit) 6,826 9,660 6,961
Allowance for equity funds used during construction (2,898) (2,776) (2,363)
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization 0 0 1,367
Allocation of tax (benefit) related to stock compensation awards 91 (788) (392)
Non-deductible compensation 1,125 899 2,630
Transaction costs 74 848 0
Other 1,699 1,595 1,951
Total income taxes $ 26,130 $ 32,582 $ 20,636
Effective tax rate 12.37% 13.33% 9.92%
Public Service Company of New Mexico      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 29,026 $ 41,696 $ 38,193
Amortization of accumulated investment tax credits (172) (237) (243)
Amortization of excess deferred income tax (14,421) (15,158) (21,609)
Flow-through of depreciation items 2,641 689 1,279
(Earnings) attributable to non-controlling interest in Valencia (3,176) (3,253) (2,943)
State income tax, net of federal (benefit) 5,694 7,609 7,111
Allowance for equity funds used during construction (1,958) (2,080) (1,461)
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization 0 0 1,367
Allocation of tax (benefit) related to stock compensation awards 65 (563) (279)
Non-deductible compensation 701 547 1,554
Transaction costs 10 22 0
Other 788 (2,280) (1,112)
Total income taxes $ 19,198 $ 26,992 $ 21,857
Effective tax rate 13.89% 13.59% 12.02%
Texas-New Mexico Power Company      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 22,560 $ 15,076 $ 13,628
Amortization of excess deferred income tax (9,177) (9,326) (9,113)
State income tax, net of federal (benefit) 2,103 1,763 1,625
Allocation of tax (benefit) related to stock compensation awards 26 (224) (112)
Non-deductible compensation 422 351 1,071
Transaction costs 1 (4) 0
Other (774) 276 (791)
Total income taxes $ 15,161 $ 7,912 $ 6,308
Effective tax rate 14.11% 11.02% 9.71%