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Regulatory and Rate Matters - PNM (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 01, 2023
USD ($)
Apr. 17, 2023
USD ($)
program
Apr. 15, 2023
USD ($)
Jan. 03, 2023
USD ($)
Jan. 01, 2023
USD ($)
Dec. 05, 2022
USD ($)
MW
Apr. 15, 2020
USD ($)
MMBTU
program
Jun. 30, 2023
USD ($)
$ / MWh
MW
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
lease
$ / MWh
MW
Jun. 30, 2022
USD ($)
Dec. 31, 2021
GWh
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               261.6   261.6    
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               $ 15.4 $ 17.4 $ 34.0 $ 31.8  
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   0.1073                    
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    
Disincentives and Incentives Added | 2020 Energy Efficiency Annual Report | PNM                        
Public Utilities, Commitments And Contingencies [Line Items]                        
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh                       94
Disincentives and Incentives Added | 2021 Energy Efficiency Annual Report | PNM                        
Public Utilities, Commitments And Contingencies [Line Items]                        
Energy efficiency and load management programs     $ 0.3