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Fair Value of Derivative and Other Financial Instruments - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) MW | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
(Increase)/decrease in realized impairment losses | $ 17,800,000 | $ 19,100,000 | $ (25,800,000)
Minimum |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets distribution period | 10 years |  |
Maximum |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets distribution period | 15 years |  |
Equity Securities | Pension Plan |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets (as a percent) | 35.00% |  |
Alternative Investments | Pension Plan |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets (as a percent) | 15.00% |  |
Fixed Income | Pension Plan |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets (as a percent) | 50.00% |  |
PNM |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amounts recognized for the legal right to reclaim cash collateral | $ 0 | 0 |
Amounts posted as cash collateral under margin arrangements | 100,000 | 200,000 |
Obligations to return cash collateral | 0 | 200,000 |
PNM | Commodity Contract | Designated as Hedging Instrument |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other current assets | 0 | 826,000 |
Current derivative liability | $ 5,737,000 | $ 0 |
PNM | Portfolio One |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 125 | 85 |
PNM | Portfolio Two |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 150 | 50 |
PNM | Portfolio Three |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 100 |  |
PNM | Fuel and Purchased Power Costs | Commodity Contract | Designated as Hedging Instrument |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other current assets | $ 0 | $ 800,000 |
Current derivative liability | $ 5,700,000 | 0 |
TNMP | Equity Securities | Pension Plan |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets (as a percent) | 16.00% |  |
TNMP | Alternative Investments | Pension Plan |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets (as a percent) | 14.00% |  |
TNMP | Fixed Income | Pension Plan |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment allocation targets (as a percent) | 70.00% |  |
Recurring Basis | PNM |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale | $ 453,421,000 |  |
Nuclear Decommissioning Trust | Recurring Basis | PNM |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale | 384,600,000 | 361,000,000 |
Mine Reclamation Trust | Recurring Basis | PNM |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale | 82,700,000 | 71,100,000 |
SJGS Decommissioning Trust | Recurring Basis | PNM |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale | $ 8,200,000 | $ 12,300,000 |

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