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Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Short-term Debt [Line Items] |  |
Short-term debt | $ 244,500 | $ 261,900
PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | 186,200 | 137,500
Texas-New Mexico Power Company |  |
Short-term Debt [Line Items] |  |
Short-term debt | 18,300 | 55,100
PNM Revolving Credit Facility | PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 146,200 | $ 107,500
Line of credit facility, interest rate at period end | 6.67% | 6.69%
PNM New Mexico Credit Facility | PNM |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 40,000 | $ 30,000
Line of credit facility, interest rate at period end | 6.68% | 6.71%
TNMP Revolving Credit Facility | Texas-New Mexico Power Company |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 18,300 | $ 55,100
Line of credit facility, interest rate at period end | 6.29% | 6.32%
PNMR Revolving Credit Facility | PNMR Development |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 40,000 | $ 69,300
Line of credit facility, interest rate at period end | 6.92% | 6.96%

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