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Financing - Schedule of Short-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
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%