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Regulatory and Rate Matters - PNM (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 03, 2024
USD ($)
Jan. 01, 2024
USD ($)
Apr. 17, 2023
USD ($)
program
Dec. 05, 2022
USD ($)
lease
MW
Mar. 31, 2024
USD ($)
$ / MWh
MW
Mar. 31, 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
Operating revenues         $ (436,877) $ (544,077)  
Excess return on jurisdictional equity that would require refund         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            
PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Operating revenues         $ (308,115) (430,165)  
Number of leases renewed | lease       5      
Number of megawatts purchased (in megawatts) | MW       64.1      
Renewable Portfolio Standard | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Number of megawatts of Solar PV facilities | MW         158    
Current output in the geothermal facility (in megawatts) | MW         11    
Solar generation capacity (in megawatts) | MW         289.3    
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     $ 34,500        
Program costs related to energy efficiency, in year two     35,400        
Program costs related to energy efficiency, in year three     $ 36,500        
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              
Public Utilities, Commitments And Contingencies [Line Items]              
Requested return on equity 9.26%            
Requested debt capital structure 50.10%            
Requested equity capital structure, percentage 0.29%            
Requested equity capital structure 49.61%            
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            
NM 2022 Rate Case | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Recovery of base rate       $ 2,700,000      
NM 2022 Rate Case | PNM | Non-Fuel Energy              
Public Utilities, Commitments And Contingencies [Line Items]              
Requested rate increase (decrease)       $ 63,800      
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]              
Operating revenues             38,400
2024 Rate Change | Palo Verde Nuclear Generating Station              
Public Utilities, Commitments And Contingencies [Line Items]              
Regulatory disallowances             8,200
2024 Rate Change | Four Corners              
Public Utilities, Commitments And Contingencies [Line Items]              
Regulatory disallowances             $ 55,500
NMPRC              
Public Utilities, Commitments And Contingencies [Line Items]              
Requested return on equity       10.25%      
Action plan, covered period         3 years    
NMPRC | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Proposed revision to rider that will allow for recovery   $ 59,000          
NMPRC | Renewable Energy Rider | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Recorded revenues from renewable rider         $ 15,300 $ 18,600  
Minimum | Energy Efficiency and Load Management Program | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Profit incentive sliding scale multiplier     0.071        
Maximum | Renewable Portfolio Standard | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Reasonable cost threshold in megawatts per hour | $ / MWh         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