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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Services billings: | TXNM to PNM |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | $ 35,317 | $ 31,023 | $ 67,404 | $ 66,430
Services billings: | TXNM to TNMP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 14,109 | 12,885 | 27,485 | 27,121
Services billings: | PNM to TNMP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 86 | 109 | 165 | 190
Services billings: | TNMP to TXNM |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 28 | 0 | 56 | 10
Services billings: | TXNM to NMRD |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 0 | 0 | 0 | 66
Renewable energy purchases: | PNM from NMRD |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 0 | 0 | 0 | 1,523
Interest billings: | TXNM to PNM |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 76 | 25 | 84 | 39
Interest billings: | TXNM to TNMP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | 41 | 22 | 186 | 179
Interest billings: | PNM to TXNM |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of related party transaction | $ 132 | $ 154 | $ 265 | $ 309

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