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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]      
Current federal income tax $ 0 $ 0 $ 0
Current state income tax (benefit) (1,984) (2,841) 1,597
Deferred federal income tax (benefit) 13,042 (11,503) 18,413
Deferred state income tax (benefit) 10,630 (825) 7,302
Amortization of accumulated investment tax credits (170) (1,181) (1,182)
Total income taxes (benefits) 21,518 (16,350) 26,130
PNM      
Income Taxes [Line Items]      
Current federal income tax (7,005) 9,518 (13,533)
Current state income tax (benefit) (5,681) (4,304) 3,244
Deferred federal income tax (benefit) 28,183 (22,951) 25,298
Deferred state income tax (benefit) 13,890 1,150 4,361
Amortization of accumulated investment tax credits (170) (171) (172)
Total income taxes (benefits) 29,217 (16,758) 19,198
TNMP      
Income Taxes [Line Items]      
Current federal income tax (2,549) 11,354 17,055
Current state income tax (benefit) 3,300 3,055 2,662
Deferred federal income tax (benefit) 26,363 2,917 (4,527)
Deferred state income tax (benefit) 0 (29) (29)
Total income taxes (benefits) $ 27,114 $ 17,297 $ 15,161