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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 25, 2023
batteryStorageAgreement
Sep. 29, 2022
USD ($)
Jan. 31, 2024
USD ($)
Jan. 31, 2023
USD ($)
Sep. 30, 2023
batteryStorageAgreement
MW
Dec. 31, 2022
USD ($)
batteryStorageAgreement
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Apr. 02, 2021
lease
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Lessee, Lease, Description [Line Items]                        
Decrease in Inventories   $ 6,430         $ (31,301) $ (8,528) $ 1,356      
Unamortized cost of prepaid right-of-way agreements           $ 54,600 56,200 54,600        
Amortization of prepaid right-of-way agreements             3,500 3,800 3,700      
Operating lease assets, net of amortization           $ 55,982 $ 182,201 55,982        
Non-lease component, percent of lease liability             25.50%          
Lessee, operating lease, unguaranteed residual value             $ 24,900          
Lease not yet commenced, expected fixed consideration             $ 961,000          
Lease not yet commenced, term             20 years          
Materials, Supplies, and Fuel Stock                        
Lessee, Lease, Description [Line Items]                        
Decrease in Inventories       $ 5,300                
PNM                        
Lessee, Lease, Description [Line Items]                        
Number of leases under which lease term was extended | lease                   5    
Decrease in Inventories             $ (25,681) (4,804) 2,531      
Number of battery storage agreements | batteryStorageAgreement 3         2            
Operating lease assets, net of amortization           $ 52,556 180,370 52,556        
Lessee, operating lease, unguaranteed residual value             12,600          
TNMP                        
Lessee, Lease, Description [Line Items]                        
Decrease in Inventories             (5,620) (3,723) $ (1,175)      
Operating lease assets, net of amortization           $ 3,426 1,814 $ 3,426        
Lessee, operating lease, unguaranteed residual value             12,300          
Palo Verde Nuclear Generating Station, Units 1 And 4 | PNM                        
Lessee, Lease, Description [Line Items]                        
Number of leases expiring | lease                       4
Number of leases under which lease term was extended | lease                       4
Palo Verde Nuclear Generating Station, Unit 2 | PNM                        
Lessee, Lease, Description [Line Items]                        
Number of leases expiring | lease                     4  
Number of leases under which lease term was extended | lease                     1  
Annual lease payments during renewal period             800          
Navajo Nation | PNM                        
Lessee, Lease, Description [Line Items]                        
Right-of-way lease, annual payments             6,000          
Right-of-way lease, payments             8,300          
PNM Owned Assets                        
Lessee, Lease, Description [Line Items]                        
Proceeds from sale of assets       33,700                
PNM Owned Assets | Subsequent Event                        
Lessee, Lease, Description [Line Items]                        
Proceeds from sale of assets     $ 3,500                  
Net Utility Plant                        
Lessee, Lease, Description [Line Items]                        
Proceeds from sale of assets       $ 28,400                
Nuclear Fuel | Net Utility Plant | Subsequent Event                        
Lessee, Lease, Description [Line Items]                        
Proceeds from sale of assets     3,000                  
Nuclear Fuel | Materials and supplies | Subsequent Event                        
Lessee, Lease, Description [Line Items]                        
Proceeds from sale of assets     $ 500                  
Equipment                        
Lessee, Lease, Description [Line Items]                        
Operating lease, residual value of leased asset             1,800          
Equipment | PNM                        
Lessee, Lease, Description [Line Items]                        
Operating lease, residual value of leased asset             800          
Equipment | TNMP                        
Lessee, Lease, Description [Line Items]                        
Operating lease, residual value of leased asset             1,000          
Battery Storage                        
Lessee, Lease, Description [Line Items]                        
Number of battery storage agreements | batteryStorageAgreement         2              
Term of lease         20 years              
Operating lease assets, net of amortization             $ 138,000          
Battery Storage | PNM                        
Lessee, Lease, Description [Line Items]                        
Number of megawatts in battery storage facilities (in megawatts) | MW         170