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Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term debt | $ 409,400 | $ 232,000
PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 210,900 | 185,900
Texas-New Mexico Power Company |  |
Short-term Debt [Line Items] |  |
Short-term debt | 100,000 | 36,700
PNM Revolving Credit Facility | PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 170,900 | 145,900
PNM New Mexico Credit Facility | PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 40,000 | 40,000
TNMP Revolving Credit Facility | Texas-New Mexico Power Company |  |
Short-term Debt [Line Items] |  |
Short-term debt | 100,000 | 36,700
PNMR Revolving Credit Facility |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 98,500 | $ 9,400

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