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Variable Interest Entities - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations        
Earnings attributable to non-controlling interest $ 18,533 $ 15,122 $ 15,490  
Financial Position        
Current assets 475,543 410,978    
Total assets 10,252,605 9,257,377 8,666,885  
Current liabilities 1,230,760 890,370    
Non-controlling interest in Valencia 49,958 52,994    
PNM        
Results of Operations        
Earnings attributable to non-controlling interest 18,533 15,122 15,490  
Financial Position        
Current assets 377,837 345,645    
Total assets 6,813,065 6,272,166    
Current liabilities 839,194 692,155    
Non-controlling interest in Valencia $ 49,958 52,994    
PNM | Valencia        
Variable Interest Entity [Line Items]        
Number of megawatts purchased (in megawatts) | MW 155      
Payment for fixed charges $ 20,300 19,500 19,800  
Payment for variable charges $ 5,200 1,900 1,900  
Purchase price, percentage of the book value reduced by related indebtedness 50.00%      
Purchase price, percentage of fair market value 50.00%      
Results of Operations        
Operating revenues $ 25,421 21,403 21,624  
Operating expenses 6,896 6,281 6,134  
Other Misc (Income)/Expense (8) 0 0  
Earnings attributable to non-controlling interest 18,533 15,122 $ 15,490  
Financial Position        
Current assets 3,422 3,429    
Net property, plant and equipment 47,253 50,094    
Total assets 50,675 53,523    
Current liabilities 717 529    
Non-controlling interest in Valencia $ 49,958 $ 52,994    
PNM | Maximum | Valencia        
Variable Interest Entity [Line Items]        
Option to purchase a percentage of the plant or VIE (up to ) 50.00%      
NM Capital | Coal Supply | San Juan Generating Station        
Financial Position        
Issuance in letters of credit $ 30,300     $ 30,300