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Regulatory and Rate Matters - PNM (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 01, 2023
USD ($)
Apr. 17, 2023
USD ($)
program
Jan. 03, 2023
USD ($)
Jan. 01, 2023
USD ($)
Dec. 05, 2022
USD ($)
MW
Apr. 15, 2020
USD ($)
MMBTU
program
Sep. 30, 2023
USD ($)
$ / MWh
MW
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
lease
$ / MWh
MW
Sep. 30, 2022
USD ($)
Public Utilities, Commitments And Contingencies [Line Items]                    
Excess return on jurisdictional equity that would require refund             0.50%   0.50%  
Return on equity                 10.173%  
Approved return on equity                 10.075%  
Allowed return on equity                 9.575%  
Allowed return on equity, additional                 0.50%  
PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Approved equity capital structure                 52.00%  
Approved debt capital structure                 48.00%  
Number of leases renewed | lease                 5  
Number of megawatts purchased (in megawatts) | MW             64.1   64.1  
Non-recurring costs     $ 98.3              
Renewable Portfolio Standard | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Number of megawatts of Solar PV facilities | MW             158   158  
Current output in the geothermal facility (in megawatts) | MW             11   11  
Solar generation capacity (in megawatts) | MW             273.9   273.9  
Energy Efficiency and Load Management Program | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Program costs related to energy efficiency, number of programs | program           12        
Program costs related to energy efficiency, in year one           $ 31.4        
Program costs related to energy efficiency, in year two           31.0        
Program costs related to energy efficiency, in year three           $ 29.6        
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU           94        
2024 Plan | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Program costs related to energy efficiency, number of programs | program   10                
Program costs related to energy efficiency, in year one   $ 34.5                
Program costs related to energy efficiency, in year two   35.4                
Program costs related to energy efficiency, in year three   $ 36.5                
Integrated Resource Plan, 2011 | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Frequency of IRP filings                 3 years  
Planning period covered of IRP                 20 years  
NM 2022 Rate Case | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Recovery of base rate         $ 2,700.0          
Revenue deficiency driver, years of operation         6 years          
Leased PVNGS capacity, expiration | MW         114          
NM 2022 Rate Case | PNM | Non-Fuel Energy                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Requested rate increase (decrease)         $ 63.8          
NMPRC                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Requested return on equity         10.25%          
Action plan, covered period                 4 years  
NMPRC | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Proposed revision to rider that will allow for recovery $ 59.0     $ 61.0            
NMPRC | Renewable Energy Rider | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Recorded revenues from renewable rider             $ 13.0 $ 12.7 $ 47.0 $ 44.5
Minimum | Renewable Portfolio Standard | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU           80        
Minimum | Energy Efficiency and Load Management Program | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Profit incentive sliding scale multiplier   0.071       0.071        
Maximum | Renewable Portfolio Standard | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Reasonable cost threshold in megawatts per hour | $ / MWh             60   60  
Maximum | Energy Efficiency and Load Management Program | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Profit incentive sliding scale multiplier   0.0882                
New Mexico Wind | Renewable Portfolio Standard 2014 | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Number of megawatts for wind energy | MW                 200  
Red Mesa Wind | Renewable Portfolio Standard 2014 | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Number of megawatts for wind energy | MW                 102  
La Joya Wind | Renewable Portfolio Standard | PNM                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Number of megawatts for wind energy | MW                 140