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Fair Value of Derivative and Other Financial Instruments - Narrative (Details) |  | 4 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 23, 2024 MW | Sep. 30, 2023 MW | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Obligations to return cash |  |  | $ 200,000 | $ 200,000
PNM |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amounts recognized for right to reclaim cash |  |  | 0 | 0
Cash collateral under margin arrangements |  |  | 600,000 | 200,000
PNM | Recurring |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale debt securities |  |  | 402,386,000 |
PNM | Nuclear Decommissioning Trust | Recurring |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale debt securities |  |  | 370,900,000 | 361,000,000.0
PNM | SJGS Decommissioning Trust | Recurring |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale debt securities |  |  | 9,600,000 | 12,300,000
PNM | Mine Reclamation Trust | Recurring |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale debt securities |  |  | 60,700,000 | 71,100,000
PNM | Commodity derivatives | Designated as Hedging Instrument |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Other current assets |  |  | 846,000 | 826,000
Current derivative liability |  |  | $ 4,558,000 | 0
PNM | Portfolio One |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 150 | 85 |  |
PNM | Portfolio Two |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 100 | 50 |  |
PNM | Fuel and purchased power costs | Commodity derivatives | Designated as Hedging Instrument |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Other current assets |  |  |  | 800,000
Current derivative liability |  |  |  | $ 0

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