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Financing - Financing Activities (Details)
1 Months Ended 3 Months Ended
Nov. 10, 2022
USD ($)
Jul. 31, 2024
USD ($)
Mar. 31, 2024
shares
Jul. 01, 2024
USD ($)
Mar. 28, 2024
USD ($)
debtInstrument
May 16, 2023
USD ($)
Apr. 28, 2023
USD ($)
bond
debtInstrument
Debt Instrument [Line Items]              
Forward sale agreement (in shares) | shares     4,365,510        
At-The-Market              
Debt Instrument [Line Items]              
Distribution agreement $ 200,000,000            
PNM              
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 | Forecast | Senior Unsecured Noted, Pollution Control Revenue Bonds              
Debt Instrument [Line Items]              
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 | PNM, Due May 2026              
Debt Instrument [Line Items]              
Aggregate principal amount           $ 650,000,000  
Unsecured Debt | PNM | PNM 2023 Note Purchase Agreement              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 200,000,000
Number of debt issuances | debtInstrument             2
Unsecured Debt | PNM | PNM 2023 SUNs At 5.1%, Due April 28, 2035              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 150,000,000
Stated interest rate             5.51%
Unsecured Debt | PNM | PNM 2023 SUNs At 5.92%, Due April 28, 2053              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 50,000,000
Stated interest rate             5.92%
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    
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% | Forecast              
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% | Forecast              
Debt Instrument [Line Items]              
Aggregate principal amount       $ 128,000,000      
Stated interest rate       5.79%      
Secured Debt | PNM | TNMP 2023 Bond Purchase Agreement              
Debt Instrument [Line Items]              
Debt instrument, series of bond issuance | bond             2
Secured Debt | Texas-New Mexico Power Company | TNMP 2023 Bond Purchase Agreement              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 185,000,000
Secured Debt | Texas-New Mexico Power Company | TNMP 2023 Bond Purchase Agreement At 5.01%, Due April 28, 2033              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 130,000,000.0
Stated interest rate             5.01%
Secured Debt | Texas-New Mexico Power Company | TNMP 2023 Bond Purchase Agreement At 5.47%, Due July 28, 2053              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 55,000,000.0
Stated interest rate             5.47%
Bonds | PNMR 2021 Delayed-Draw Term Loan              
Debt Instrument [Line Items]              
Variable interest rate     6.38%        
Bonds | PNMR 2023 Delayed-Draw Term Loan              
Debt Instrument [Line Items]              
Variable interest rate     6.78%