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Variable Interest Entities - Schedule of Impact of ETBC I on PNM’s Consolidated Balance Sheets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Results of Operations      
 Depreciation and amortization $ 423,010,000 $ 353,692,000 $ 341,123,000
Financial Position      
Regulatory assets - Current 41,492,000 73,046,000  
Current installments of long-term debt 611,603,000 280,169,000  
Regulatory liabilities - Current 34,173,000 140,005,000  
Long-term Debt 4,311,765,000 4,241,642,000  
PNM      
Results of Operations      
 Depreciation and amortization 250,042,000 202,885,000 213,517,000
Financial Position      
Regulatory assets - Current 36,224,000 72,996,000  
Restricted cash (included in Other deferred charges)     $ 0
Current installments of long-term debt 560,637,000 200,222,000  
Regulatory liabilities - Current 33,571,000 134,846,000  
Long-term Debt 1,898,955,000 2,061,558,000  
ETBC I | PNM      
Results of Operations      
Electric Operating Revenues 24,798,000 2,914,000  
 Depreciation and amortization 4,550,000 407,000  
Interest Charges 20,073,000 2,516,000  
Other 175,000 (9,000)  
Net Earnings 0 0  
Financial Position      
Regulatory assets - Current 0 2,724,000  
Securitized Cost (included in Regulatory assets - Deferred) 336,079,000 340,629,000  
Current installments of long-term debt 6,907,000 2,529,000  
Accrued interest and taxes 7,452,000 2,502,000  
Regulatory liabilities - Current 6,975,000 0  
Long-term Debt 331,726,000 338,521,000  
ETBC I | PNM | Other Current Assets      
Financial Position      
Restricted cash (included in Other deferred charges) 15,838,000 0  
ETBC I | PNM | Other Deferred Costs Net Including Deferred Finance Costs      
Financial Position      
Restricted cash (included in Other deferred charges) $ 1,748,000 $ 1,728,000