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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Services billings: | TXNM to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 32,087 | $ 35,407
Services billings: | TXNM to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 13,376 | 14,237
Services billings: | PNM to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 79 | 81
Services billings: | TNMP to TXNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 28 | 10
Services billings: | TXNM to NMRD |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 66
Renewable energy purchases: | PNM from NMRD |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 1,523
Interest billings: | TXNM to PNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 8 | 14
Interest billings: | TXNM to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 145 | 14
Interest billings: | PNM to TXNM |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 133 | $ 155

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