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Fair Value of Derivative and Other Financial Instruments - Schedule of Commodity Contract Volume Positions (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2025 MMBTU	Jun. 30, 2025 MWh	Dec. 31, 2024 MMBTU	Dec. 31, 2024 MWh
Commodity derivatives | Designated as Hedging Instrument | PNM
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Economic Hedges (in mmbtu and mwh)	0	179,800	0	89,900

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