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Fair Value of Derivative and Other Financial Instruments - Schedule of Commodity Contract Volume Positions (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 MMBTU | Sep. 30, 2023 MWh | Dec. 31, 2023 MMBTU | Dec. 31, 2023 MWh
Commodity Contract | Designated as hedging instrument | PNM |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Economic Hedges (in mmbtu and mwh) | 0 | 432,200 | 0 | (15,360)

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