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Financing - Financing Activities (Details)
1 Months Ended 3 Months Ended
Jan. 31, 2025
Jul. 31, 2024
USD ($)
Mar. 31, 2025
Apr. 23, 2025
USD ($)
debtInstrument
Feb. 14, 2025
USD ($)
Jan. 21, 2025
USD ($)
Jul. 01, 2024
USD ($)
Mar. 28, 2024
USD ($)
debtInstrument
Public Service Company of New Mexico                
Debt Instrument [Line Items]                
Maturity term over which financings require regulator approval (more than)     18 months          
Texas-New Mexico Power Company | FMB Notes Due July 2024 | Senior Unsecured Noted, Pollution Control Revenue Bonds                
Debt Instrument [Line Items]                
Stated interest rate   4.03%            
Repayments of unsecured debt   $ 80,000,000            
Line of credit                
Debt Instrument [Line Items]                
Ratio of debt to capital (less than or equal to)     70.00%          
Line of credit | PNM and TNMP                
Debt Instrument [Line Items]                
Ratio of debt to capital (less than or equal to)     65.00%          
Unsecured Debt | Public Service Company of New Mexico | PNM 2025 Note Purchase Agreement | Subsequent Event                
Debt Instrument [Line Items]                
Aggregate principal amount       $ 300,000,000        
Number of debt issuances | debtInstrument       2        
Unsecured Debt | Public Service Company of New Mexico | PNM 2025 Bond At Five Point Seven Five, Due June Twenty Thirty Two | Subsequent Event                
Debt Instrument [Line Items]                
Aggregate principal amount       $ 125,000,000        
Stated interest rate       5.75%        
Unsecured Debt | Public Service Company of New Mexico | PNM 2025 Bond At Six Point One Three, Due June Twenty Thirty Seven | Subsequent Event                
Debt Instrument [Line Items]                
Aggregate principal amount       $ 175,000,000        
Stated interest rate       6.13%        
Unsecured Debt | Texas-New Mexico Power Company | TNMP 2025 Bond At Five Point One Nine Percent                
Debt Instrument [Line Items]                
Aggregate principal amount         $ 140,000,000      
Stated interest rate         5.19%      
Unsecured Debt | Texas-New Mexico Power Company | TNMP 2024 Bond Purchase Agreement                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 285,000,000
Number of debt issuances | debtInstrument               4
Unsecured Debt | Texas-New Mexico Power Company | TNMP 2024 Bond, 5.26%, Due March 28, 2029                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 32,000,000
Number of debt issuances | debtInstrument               2
Stated interest rate               5.26%
Unsecured Debt | Texas-New Mexico Power Company | TNMP 2024 Bond, 5.55%, Due March 28, 2036                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 85,000,000
Stated interest rate               5.55%
Unsecured Debt | Texas-New Mexico Power Company | TNMP 2024 Bond, 5.65%                
Debt Instrument [Line Items]                
Aggregate principal amount             $ 40,000,000  
Stated interest rate             5.65%  
Unsecured Debt | Texas-New Mexico Power Company | TNMP 2024 Bond, 5.79%                
Debt Instrument [Line Items]                
Aggregate principal amount             $ 128,000,000  
Stated interest rate             5.79%  
Notes Payable to Banks | Public Service Company of New Mexico | PNM 2025 75 Million Term Loan                
Debt Instrument [Line Items]                
Aggregate principal amount           $ 195,000,000    
Stated interest rate     5.32%          
Bonds | TXNM 2021 Delayed Draw Term Loan                
Debt Instrument [Line Items]                
Variable interest rate     5.37%          
Bonds | TXNM 2023 Delayed-Draw Term Loan                
Debt Instrument [Line Items]                
Variable interest rate     5.77%          
Bonds | PNM 2024 Term Loan, Due November 2025                
Debt Instrument [Line Items]                
Variable interest rate     5.32%          
Bonds | PNM 2025 Term Loan, Due July Twenty Twenty Six                
Debt Instrument [Line Items]                
Variable interest rate     5.32%          
Convertible Debt | Convertible Notes                
Debt Instrument [Line Items]                
Conversion ratio 0.0225005