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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 31, 2024
USD ($)
Apr. 30, 2023
USD ($)
Jan. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Operating Leased Assets [Line Items]                
Proceeds from sale of productive assets       $ 2,840 $ 28,372      
Reduction to inventories       6,457 (2,443)      
Unamortized cost, right-of-way lease payments       71,300   $ 56,200    
Operating lease, right-of-use asset, amortization expense       $ 1,100 900      
Non-lease component, percent of lease liability       25.50%        
Operating lease, right-of-use asset       $ 179,480   182,201    
Lessee, operating lease, unguaranteed residual value       23,800        
Lease to be executed, fixed consideration       $ 1,100,000        
Lease to be executed, term of contract       20 years        
Materials, Supplies, and Fuel Stock                
Operating Leased Assets [Line Items]                
Reduction to inventories $ (600)     $ (5,300)        
PNM                
Operating Leased Assets [Line Items]                
Proceeds from sale of productive assets       2,840 28,372      
Reduction to inventories       3,612 (2,916)      
Operating lease, right-of-use asset       177,865   180,370    
Lessee, operating lease, unguaranteed residual value       11,900        
PNM | Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases                
Operating Leased Assets [Line Items]                
Number of leases, expiring | lease               4
Number of leases under which lease term was extended | lease               4
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases                
Operating Leased Assets [Line Items]                
Number of leases, expiring | lease             4  
Number of leases under which lease term was extended | lease             1  
PNM | Navajo Nation                
Operating Leased Assets [Line Items]                
Annual lease payments       6,000        
Right-of-way lease payments   $ 8,300            
TNMP                
Operating Leased Assets [Line Items]                
Reduction to inventories       2,845 $ 473      
Operating lease, right-of-use asset       1,615   $ 1,814    
Lessee, operating lease, unguaranteed residual value       12,000        
Equipment                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset       1,800        
Equipment | PNM                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset       800        
Equipment | TNMP                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset       1,000        
PNM Owned Assets                
Operating Leased Assets [Line Items]                
Proceeds from sale of productive assets 3,400   $ 33,700          
Net Utility Plant                
Operating Leased Assets [Line Items]                
Proceeds from sale of productive assets $ 2,800     $ 28,400        
Other                
Operating Leased Assets [Line Items]                
Operating lease, term of contract       20 years