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Variable Interest Entities - Schedule of Impact on Balance Sheet (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Regulatory assets $ 73,046,000 $ 20,265,000
Current maturities of long-term debt 280,169,000 184,793,000
Long-Term Debt 4,241,642,000 3,892,594,000
PNM    
Variable Interest Entity [Line Items]    
Regulatory assets 72,996,000 18,333,000
Restricted Cash (included in Other Deferred Charges) 0 0
Current maturities of long-term debt 200,222,000 184,793,000
Long-Term Debt 2,061,558,000 $ 1,816,107,000
ETBC I | PNM    
Variable Interest Entity [Line Items]    
Regulatory assets 2,724,000  
Restricted Cash (included in Other Deferred Charges) 1,728,000  
Securitized Cost (included in Deferred Regulatory Assets) 340,629,000  
Current maturities of long-term debt 2,529,000  
Accrued Interest 2,502,000  
Long-Term Debt $ 338,521,000