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Fair Value of Derivative and Other Financial Instruments - Narrative (Details) |  | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | ---
Apr. 23, 2024 MW | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 MW | Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Obligations to return cash |  |  |  |  | $ 200,000
PNM |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amounts recognized for right to reclaim cash |  | $ 0 |  |  | 0
Cash collateral under margin arrangements |  | 300,000 |  |  | 200,000
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings |  | 13,400,000 | $ 2,000,000 |  |
PNM | Commodity derivatives | Designated as Hedging Instrument |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Other current assets |  | 835,000 |  |  | 826,000
Current derivative liability |  | 0 |  |  | 0
PNM | Portfolio One |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  |  | 85 |
PNM | Portfolio One | Subsequent event |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 150 |  |  |  |
PNM | Portfolio Two |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  |  | 50 |
PNM | Portfolio Two | Subsequent event |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 100 |  |  |  |
PNM | Portfolio Three |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  |  | 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
PNM | Recurring |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 448,164,000 |  |  | 444,408,000
Nuclear Decommissioning Trust | PNM | Recurring |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 371,000,000 |  |  | 361,000,000
SJGS Decommissioning Trust | PNM | Recurring |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 11,700,000 |  |  | 12,300,000
Mine Reclamation Trust | PNM | Recurring |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | $ 65,500,000 |  |  | $ 71,100,000

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