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Financing - Schedule of Short-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Short-term Debt [Line Items]    
Balance Outstanding $ 459,000 $ 261,900
PNM    
Short-term Debt [Line Items]    
Balance Outstanding 179,900 137,500
Texas-New Mexico Power Company    
Short-term Debt [Line Items]    
Balance Outstanding 97,500 55,100
PNM Revolving Credit Facility | PNM    
Short-term Debt [Line Items]    
Balance Outstanding $ 159,900 $ 107,500
Weighted Average Interest Rate 6.39% 6.69%
PNM New Mexico Credit Facility | PNM    
Short-term Debt [Line Items]    
Balance Outstanding $ 20,000 $ 30,000
Weighted Average Interest Rate 6.20% 6.71%
TNMP Revolving Credit Facility | Texas-New Mexico Power Company    
Short-term Debt [Line Items]    
Balance Outstanding $ 97,500 $ 55,100
Weighted Average Interest Rate 5.96% 6.32%
TXNM Revolving Credit Facility | TXNM    
Short-term Debt [Line Items]    
Balance Outstanding $ 181,600 $ 69,300
Weighted Average Interest Rate 6.58% 6.96%