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Financing - Schedule of Short-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Short-term Debt [Line Items]    
Balance Outstanding $ 593,700 $ 609,300
PNM    
Short-term Debt [Line Items]    
Balance Outstanding 298,300 363,800
Texas-New Mexico Power Company    
Short-term Debt [Line Items]    
Balance Outstanding 139,900 151,600
PNM Revolving Credit Facility | PNM    
Short-term Debt [Line Items]    
Balance Outstanding $ 258,300 $ 323,800
Weighted Average Interest Rate 5.67% 5.73%
PNM New Mexico Credit Facility | PNM    
Short-term Debt [Line Items]    
Balance Outstanding $ 40,000 $ 40,000
Weighted Average Interest Rate 5.67% 5.81%
TNMP Revolving Credit Facility | Texas-New Mexico Power Company    
Short-term Debt [Line Items]    
Balance Outstanding $ 139,900 $ 151,600
Weighted Average Interest Rate 5.30% 5.37%
TXNM Revolving Credit Facility | TXNM    
Short-term Debt [Line Items]    
Balance Outstanding $ 155,500 $ 93,900
Weighted Average Interest Rate 5.92% 5.96%