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Financing - Schedule of Short-Term Debt Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term debt | $ 609,300 | $ 261,900
PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 363,800 | 137,500
TNMP |  |
Short-term Debt [Line Items] |  |
Short-term debt | 151,600 | 55,100
PNM Revolving Credit Facility | PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 323,800 | 107,500
PNM New Mexico Credit Facility | PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 40,000 | 30,000
TNMP Revolving Credit Facility | TNMP |  |
Short-term Debt [Line Items] |  |
Short-term debt | 151,600 | 55,100
TXNM Revolving Credit Facility |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 93,900 | $ 69,300

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