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v3.25.2

Fair Value of Derivative and Other Financial Instruments - Narrative (Details) | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Feb. 28, 2025 MW | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) MW
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Obligations to return cash | $ 0 |  |  | $ 0 |  | $ 0
Public Service Company of New Mexico |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amounts recognized for right to reclaim cash | 0 |  |  | 0 |  | 0
Cash collateral under margin arrangements | 0 |  |  | 0 |  | 100,000
Available-for-sale debt securities | 50,520,000 |  |  | 50,520,000 |  |
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings | 0 | $ 1,600,000 |  | 0 | $ 15,000,000.0 |
Public Service Company of New Mexico | Recurring |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 426,671,000 |  |  | 426,671,000 |  | 453,421,000
Public Service Company of New Mexico | Recurring | Nuclear Decommissioning Trust |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 407,000,000.0 |  |  | 407,000,000.0 |  | 384,600,000
Public Service Company of New Mexico | Recurring | SJGS Decommissioning Trust |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 4,000,000 |  |  | 4,000,000 |  | 8,200,000
Public Service Company of New Mexico | Recurring | Mine Reclamation Trust |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | $ 76,000,000 |  |  | $ 76,000,000 |  | $ 82,700,000
Portfolio One | Public Service Company of New Mexico |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  | 250 |  |  | 150
Portfolio Two | Public Service Company of New Mexico |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW |  |  |  |  |  | 100

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