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Income Taxes - Schedule of Change in Net Accumulated Deferred Income Tax Liability to the Deferred Income Tax (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Income Taxes [Line Items]  
Net change in deferred income tax liability per above table $ 54,112
Change in tax effects of income tax related regulatory assets and liabilities (11,629)
Amortization of excess deferred income tax (23,362)
Tax effect of mark-to-market adjustments 4,802
Tax effect of excess pension liability (421)
Adjustment for uncertain income tax positions (135)
Reclassification of unrecognized tax benefits 135
Other 0
Deferred income tax (benefit) 23,502
PNM  
Income Taxes [Line Items]  
Net change in deferred income tax liability per above table 72,181
Change in tax effects of income tax related regulatory assets and liabilities (11,246)
Amortization of excess deferred income tax (20,750)
Tax effect of mark-to-market adjustments 3,554
Tax effect of excess pension liability (421)
Adjustment for uncertain income tax positions (161)
Reclassification of unrecognized tax benefits (1,254)
TNMP  
Income Taxes [Line Items]  
Net change in deferred income tax liability per above table 29,359
Change in tax effects of income tax related regulatory assets and liabilities (383)
Amortization of excess deferred income tax (2,612)
Other $ (1)