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Regulatory and Rate Matters - 2024 Rate Change (Narrative) (Details)
$ in Thousands
12 Months Ended
Jan. 03, 2024
USD ($)
Dec. 05, 2022
USD ($)
lease
MW
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Public Utilities, General Disclosures [Line Items]          
Non-fuel based rate increase $ 15,300        
Regulatory liabilities return period 2 years     2 years  
Revenues     $ (1,971,199) $ (1,939,198) $ (2,249,555)
PVNGS leased interest          
Public Utilities, General Disclosures [Line Items]          
Regulatory liabilities $ 38,400        
Four Corners          
Public Utilities, General Disclosures [Line Items]          
Disallowance $ 81,000        
NMPRC          
Public Utilities, General Disclosures [Line Items]          
Requested return on equity   10.25%      
PNM          
Public Utilities, General Disclosures [Line Items]          
Leases renewed | lease   5      
Number of megawatts purchased (in megawatts) | MW   64.1      
Regulatory liabilities     552,272 699,867  
Revenues     $ (1,379,088) (1,403,948) $ (1,766,825)
2024 Rate Change          
Public Utilities, General Disclosures [Line Items]          
Regulatory liabilities       19,200  
Deferred regulatory liability       19,200  
2024 Rate Change | PVNGS leased interest          
Public Utilities, General Disclosures [Line Items]          
Revenues       38,400  
2024 Rate Change | Four Corners          
Public Utilities, General Disclosures [Line Items]          
Disallowance       55,500  
2024 Rate Change | PVNGS (Nuclear)          
Public Utilities, General Disclosures [Line Items]          
Disallowance       $ 8,200  
2024 Rate Change | PNM          
Public Utilities, General Disclosures [Line Items]          
Recovery of base rate   $ 2,700,000      
2024 Rate Change | PNM | Non-Fuel Energy          
Public Utilities, General Disclosures [Line Items]          
Requested rate increase (decrease)   $ 63,800      
NM 2024 Rate Case          
Public Utilities, General Disclosures [Line Items]          
Requested return on equity 9.26%        
Requested equity capital structure, percentage 49.61%        
Requested debt capital structure, percentage 50.10%        
Requested preferred stock capital structure, percentage 0.29%        
NM 2024 Rate Case | PVNGS (Nuclear)          
Public Utilities, General Disclosures [Line Items]          
Approved regulatory asset $ 51,300        
Request regulatory asset 96,300        
Disallowance of return $ 45,000