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Regulatory and Rate Matters - PNM (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
May 30, 2025
USD ($)
Jan. 01, 2025
USD ($)
Nov. 26, 2024
USD ($)
Jun. 14, 2024
USD ($)
Jan. 03, 2024
USD ($)
Jun. 30, 2025
USD ($)
MW
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
MW
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
program
Public Utilities, General Disclosures [Line Items]                    
Increase in non-fuel based rate         $ 15,300          
Electric Operating Revenues           $ (502,420) $ (488,102) $ (985,212) $ (924,979)  
Regulatory liabilities return period                   2 years
Excess return on jurisdictional equity that would require refund           0.50%   0.50%    
Filed application, request to collect amount $ 54,300                  
Public Service Company of New Mexico                    
Public Utilities, General Disclosures [Line Items]                    
Electric Operating Revenues           $ (338,372) (333,671) $ (671,752) (641,786)  
Public Service Company of New Mexico | NMPRC                    
Public Utilities, General Disclosures [Line Items]                    
Proposed revision to rider that will allow for recovery   $ 58,700                
2025 Rate Request                    
Public Utilities, General Disclosures [Line Items]                    
Requested return on equity     9.45% 10.45%            
Requested equity capital structure     51.00% 52.50%            
2025 Rate Request | Public Service Company of New Mexico                    
Public Utilities, General Disclosures [Line Items]                    
Recovery of base rate       $ 3,000,000            
Requested rate increase (decrease)     $ 105,000 174,300            
Increase in base rate     82,100 92,200            
Shareholder contribution     $ 1,500              
Increase in revenues from FPPAC       $ 82,100            
2024 Rate Change                    
Public Utilities, General Disclosures [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%          
Regulatory liability                   $ 19,200
Deferred regulatory liability                   19,200
2024 Rate Change | PVNGS Leased Interest                    
Public Utilities, General Disclosures [Line Items]                    
Electric Operating Revenues                   38,400
2024 Rate Change | Four Corners                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory disallowances                   55,500
2024 Rate Change | Palo Verde Nuclear Generating Station                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory disallowances                   $ 8,200
Renewable Portfolio Standard | Public Service Company of New Mexico                    
Public Utilities, General Disclosures [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           320.5   320.5    
Renewable Portfolio Standard | Public Service Company of New Mexico | New Mexico Wind                    
Public Utilities, General Disclosures [Line Items]                    
Number of megawatts for wind energy | MW               200    
Renewable Portfolio Standard | Public Service Company of New Mexico | Red Mesa Wind                    
Public Utilities, General Disclosures [Line Items]                    
Number of megawatts for wind energy | MW               102    
Renewable Portfolio Standard | Public Service Company of New Mexico | La Joya Wind                    
Public Utilities, General Disclosures [Line Items]                    
Number of megawatts for wind energy | MW               140    
Renewable Energy Rider | Public Service Company of New Mexico | NMPRC                    
Public Utilities, General Disclosures [Line Items]                    
Recorded revenues from renewable rider           $ 14,600 $ 15,300 $ 31,600 $ 30,600  
2024 Plan | Public Service Company of New Mexico                    
Public Utilities, General Disclosures [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
Energy Efficiency and Load Management Program | Public Service Company of New Mexico | Minimum                    
Public Utilities, General Disclosures [Line Items]                    
Profit incentive sliding scale multiplier                   0.071
Energy Efficiency and Load Management Program | Public Service Company of New Mexico | Maximum                    
Public Utilities, General Disclosures [Line Items]                    
Profit incentive sliding scale multiplier                   0.0882