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Regulatory and Rate Matters - PNM (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 14, 2024
USD ($)
Jun. 03, 2024
USD ($)
Jan. 03, 2024
USD ($)
Jan. 01, 2024
USD ($)
Apr. 17, 2023
USD ($)
program
Dec. 05, 2022
USD ($)
lease
MW
Sep. 30, 2024
USD ($)
MW
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
MW
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Public Utilities, Commitments And Contingencies [Line Items]                      
Increase in non-fuel based rate     $ 15,300                
Regulatory liabilities return period     2 years               2 years
Electric operating revenues             $ 569,256 $ 505,851 $ 1,494,235 $ 1,527,084  
Excess return on jurisdictional equity that would require refund             0.50%   0.50%    
PVNGS Leased Interest                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Regulatory liability     $ 38,400                
Four Corners                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Regulatory disallowances     $ 81,000                
NMPRC                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Requested return on equity           10.25%          
Action plan, covered period                 3 years    
2025 Rate Request                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Requested return on equity 10.45%                    
Requested equity capital structure 52.50%                    
2024 Rate Change                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Regulatory liability                     $ 19,200
Deferred regulatory liability                     19,200
2024 Rate Change | PVNGS Leased Interest                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Electric operating revenues                     (38,400)
2024 Rate Change | Four Corners                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Regulatory disallowances                     55,500
2024 Rate Change | Palo Verde Nuclear Generating Station                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Regulatory disallowances                     $ 8,200
NM 2022 Rate Case                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Requested return on equity     9.26%                
Requested equity capital structure     49.61%                
Requested debt capital structure     50.10%                
Requested equity capital structure, percentage     0.29%                
NM 2022 Rate Case | Palo Verde Nuclear Generating Station                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Approved regulatory asset     $ 51,300                
Request regulatory asset     96,300                
Disallowance of return     $ 45,000                
PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of leases renewed | lease           5          
Number of megawatts purchased (in megawatts) | MW           64.1          
Electric operating revenues             $ 406,519 350,334 $ 1,048,305 1,118,741  
PNM | NMPRC                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Proposed revision to rider that will allow for recovery   $ 58,700   $ 59,000              
PNM | 2025 Rate Request                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Recovery of base rate $ 3,000,000                    
Requested rate increase (decrease) 174,300                    
Increase in base rate 92,200                    
Increase in revenues from FPPAC $ 82,100                    
PNM | 2024 Rate Change                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Recovery of base rate           $ 2,700,000          
PNM | 2024 Rate Change | Non-Fuel Energy                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Requested rate increase (decrease)           $ 63,800          
PNM | Renewable Portfolio Standard                      
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             302.4   302.4    
PNM | Renewable Portfolio Standard | La Joya Wind                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts for wind energy | MW                 140    
PNM | Renewable Portfolio Standard 2014 | New Mexico Wind                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts for wind energy | MW                 200    
PNM | Renewable Portfolio Standard 2014 | Red Mesa Wind                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts for wind energy | MW                 102    
PNM | Renewable Energy Rider | NMPRC                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Recorded revenues from renewable rider             $ 11,100 13,000 $ 41,700 47,000  
PNM | 2024 Plan                      
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         $ 34,500            
Program costs related to energy efficiency, in year two         35,400            
Program costs related to energy efficiency, in year three         $ 36,500            
PNM | Energy Efficiency and Load Management Program | Minimum                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Profit incentive sliding scale multiplier         0.071            
PNM | Energy Efficiency and Load Management Program | Maximum                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Profit incentive sliding scale multiplier         0.0882            
PNM | Integrated Resource Plan, 2011                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Frequency of IRP filings                 3 years    
Planning period covered of IRP                 20 years    
TXNM and PNM | New Mexico Public Regulation Commission | San Juan Generating Station                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Regulatory disallowances                   2,300  
Electric operating revenues                   (115,000)  
Regulatory asset, reversal               $ 2,300   $ 2,300