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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 58,850 $ 19,011 $ 44,375
Amortization of accumulated investment tax credits (170) (1,181) (1,182)
Amortization of excess deferred income tax (23,362) (22,859) (23,599)
Flow-through of depreciation items 1,003 1,281 2,795
(Earnings) attributable to non-controlling interest in Valencia (3,368) (3,892) (3,176)
State income tax (benefit), net of federal (benefit) 6,284 (2,239) 6,826
Allowance for equity funds used during construction (3,756) (3,145) (2,898)
Allocation of tax (benefit) related to stock compensation awards (17) (261) 91
Non-deductible compensation 1,332 1,659 1,125
Non-deductible merger related costs 0 (1,959) 74
Sale of NMRD (15,822) 0 0
R&D credit (1,500) (2,050) (1,320)
Other 2,044 (715) 3,019
Total income taxes (benefits) $ 21,518 $ (16,350) $ 26,130
Effective tax rate (as a percent) 7.68% (18.06%) 12.37%
PNM      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 49,868 $ 7,972 $ 29,026
Amortization of accumulated investment tax credits (170) (171) (172)
Amortization of excess deferred income tax (20,750) (14,252) (14,421)
Flow-through of depreciation items 796 1,114 2,641
(Earnings) attributable to non-controlling interest in Valencia (3,368) (3,892) (3,176)
State income tax (benefit), net of federal (benefit) 6,594 (2,216) 5,694
Allowance for equity funds used during construction (2,739) (2,065) (1,958)
Allocation of tax (benefit) related to stock compensation awards (10) (185) 65
Non-deductible compensation 822 1,015 701
Non-deductible merger related costs 0 (33) 10
R&D credit (1,450) (2,000) (1,300)
Other (376) (2,045) 2,088
Total income taxes (benefits) $ 29,217 $ (16,758) $ 19,198
Effective tax rate (as a percent) 12.30% (44.15%) 13.89%
TNMP      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 27,435 $ 23,569 $ 22,560
Amortization of excess deferred income tax (2,612) (8,607) (9,177)
State income tax (benefit), net of federal (benefit) 2,606 2,414 2,103
Allocation of tax (benefit) related to stock compensation awards (4) (77) 26
Non-deductible compensation 509 642 422
Non-deductible merger related costs 0 3 1
Other (820) (647) (774)
Total income taxes (benefits) $ 27,114 $ 17,297 $ 15,161
Effective tax rate (as a percent) 20.75% 15.41% 14.11%