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Fair Value of Derivative and Other Financial Instruments - Schedule of Commodity Contract Volume Positions (Details) | 6 Months Ended | 9 Months Ended
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Jun. 30, 2023 MMBTU | Jun. 30, 2023 MWh | Sep. 30, 2023 MMBTU | Sep. 30, 2023 MWh
Commodity derivatives | Designated as Hedging Instrument | Public Service Company of New Mexico |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Economic Hedges (in mmbtu and mwh) | 0 | 432,200 | 0 | 290,295

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