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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

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