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v3.23.3

Fair Value of Derivative and Other Financial Instruments - Narrative (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) MW | Sep. 30, 2022 USD ($) | Jun. 30, 2022 MW power_purchase_agreement | Sep. 30, 2023 USD ($) MW | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | May 31, 2022 MW | Jan. 01, 2018 MW
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of purchase power agreements, non derivatives | power_purchase_agreement |  |  | 2 |  |  |  |  |
Obligations to return cash |  |  |  |  |  | $ 200,000 |  |
PNM |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of purchase power agreements | power_purchase_agreement |  |  | 3 |  |  |  |  |
Expected exposure to market risk (in megawatts) | MW | 36 |  |  | 36 |  |  | 50 | 65
Amounts recognized for right to reclaim cash | $ 0 |  |  | $ 0 |  | 0 |  |
Cash collateral under margin arrangements | 1,000,000 |  |  | 1,000,000 |  | 10,500,000 |  |
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings | (600,000) | $ (7,100,000) |  | 2,800,000 | $ (28,700,000) |  |  |
PNM | Commodity derivatives | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Other current assets | 603,000 |  |  | 603,000 |  | 9,780,000 |  |
Current derivative liability | $ 3,514,000 |  |  | $ 3,514,000 |  | 19,209,000 |  |
PNM | Portfolio One |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 85 |  | 85 |  |  |  |  |
PNM | Portfolio Two |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  | 40 | 375 |  |  |  |
PNM | Portfolio Three |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  | 150 |  |  |  |  |
PNM | Fuel and purchased power costs | Commodity derivatives | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  |  |  | 9,800,000 |  |
Current derivative liability |  |  |  |  |  | 19,200,000 |  |
PNM | Tri-State |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Power to be sold to third party (in megawatts) | MW |  |  |  |  |  |  | 100 |
PNM | Recurring |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available-for-sale debt securities | $ 421,377,000 |  |  | $ 421,377,000 |  | 417,476,000 |  |
Nuclear Decommissioning Trust | PNM | Recurring |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available-for-sale debt securities | 334,000,000 |  |  | 334,000,000 |  | 325,300,000 |  |
SJGS Decommissioning Trust | PNM | Recurring |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available-for-sale debt securities | 15,300,000 |  |  | 15,300,000 |  | 14,700,000 |  |
Mine Reclamation Trust | PNM | Recurring |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available-for-sale debt securities | $ 72,100,000 |  |  | $ 72,100,000 |  | $ 77,500,000 |  |

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