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Related Party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Services billings: | TXNM to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | $ 132,209 | $ 124,321 | $ 115,415
Services billings: | TXNM to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 53,166 | 47,470 | 42,293
Services billings: | PNM to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 440 | 349 | 411
Services billings: | TNMP to TXNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 114 | 141 | 141
Services billings: | TNMP to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 497 | 0 | 0
Services billings: | TXNM to NMRD |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 66 | 333 | 308
Renewable energy purchases: | PNM from NMRD |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 1,523 | 12,717 | 11,795
Interest billings: | TXNM to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 142 | 23 | 13
Interest billings: | TXNM to TNMP |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 210 | 129 | 166
Interest billings: | PNM to TXNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 612 | 582 | 249
Income tax sharing payments: | TXNM to PNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 2,351 | 5,338 | 0
Income tax sharing payments: | TNMP to TXNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 10,312 | 15,749 | 8,341
Income tax sharing payments: | PNM to TXNM |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | $ 0 | $ 0 | $ 11,602

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