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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 19,011 $ 44,375 $ 51,330
Amortization of accumulated investment tax credits (1,181) (1,182) (1,247)
Amortization of excess deferred income tax (22,859) (23,599) (24,484)
Flow-through of depreciation items 1,281 2,795 798
(Earnings) attributable to non-controlling interest in Valencia (3,892) (3,176) (3,253)
State income tax (benefit), net of federal (benefit) (2,239) 6,826 9,660
Allowance for equity funds used during construction (3,145) (2,898) (2,776)
Allocation of tax (benefit) related to stock compensation awards (261) 91 (788)
Non-deductible compensation 1,659 1,125 899
Non-deductible merger related costs (1,959) 74 848
R&D credit (2,050) (1,320) (1,530)
Other (715) 3,019 3,125
Total income taxes (benefits) $ (16,350) $ 26,130 $ 32,582
Effective tax rate 18.06% 12.37% 13.33%
PNM      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 7,972 $ 29,026 $ 41,696
Amortization of accumulated investment tax credits (171) (172) (237)
Amortization of excess deferred income tax (14,252) (14,421) (15,158)
Flow-through of depreciation items 1,114 2,641 689
(Earnings) attributable to non-controlling interest in Valencia (3,892) (3,176) (3,253)
State income tax (benefit), net of federal (benefit) (2,216) 5,694 7,609
Allowance for equity funds used during construction (2,065) (1,958) (2,080)
Allocation of tax (benefit) related to stock compensation awards (185) 65 (563)
Non-deductible compensation 1,015 701 547
Non-deductible merger related costs (33) 10 22
R&D credit (2,000) (1,300) (1,500)
Other (2,045) 2,088 (780)
Total income taxes (benefits) $ (16,758) $ 19,198 $ 26,992
Effective tax rate (44.15%) 13.89% 13.59%
TNMP      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 23,569 $ 22,560 $ 15,076
Amortization of excess deferred income tax (8,607) (9,177) (9,326)
State income tax (benefit), net of federal (benefit) 2,414 2,103 1,763
Allocation of tax (benefit) related to stock compensation awards (77) 26 (224)
Non-deductible compensation 642 422 351
Non-deductible merger related costs 3 1 (4)
Other (647) (774) 276
Total income taxes (benefits) $ 17,297 $ 15,161 $ 7,912
Effective tax rate 15.41% 14.11% 11.02%