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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2024
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
MW
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Lessee, Lease, Description [Line Items]              
Proceeds from sale of plant assets     $ 2,840 $ 32,654 $ 0    
Decrease in inventories     (33,804) (31,301) (8,528)    
Unamortized cost of prepaid right-of-way agreements     67,100 56,200      
Amortization of prepaid right-of-way agreements     4,300 3,500 3,800    
Operating lease assets, net of amortization     $ 272,894 182,201      
Non-lease component, percent of lease liability     25.50%        
Lessee, operating lease, unguaranteed residual value     $ 23,300        
Lease not yet commenced, expected fixed consideration     $ 226,300        
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]              
Proceeds from sale of plant assets     $ 2,840 32,654 0    
Decrease in inventories     (25,915) (25,681) (4,804)    
Operating lease assets, net of amortization     271,433 180,370      
Lessee, operating lease, unguaranteed residual value     12,700        
TNMP              
Lessee, Lease, Description [Line Items]              
Decrease in inventories     (7,889) (5,620) $ (3,723)    
Operating lease assets, net of amortization     923 $ 1,814      
Lessee, operating lease, unguaranteed residual value     10,400        
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  
Navajo Nation | PNM              
Lessee, Lease, Description [Line Items]              
Right-of-way lease, annual payments     6,000        
Right-of-way lease, payments     8,600        
PNM Owned Assets              
Lessee, Lease, Description [Line Items]              
Proceeds from sale of plant assets $ 3,400 33,700          
Net Utility Plant              
Lessee, Lease, Description [Line Items]              
Proceeds from sale of plant assets   $ 28,400          
Nuclear Fuel | Net Utility Plant              
Lessee, Lease, Description [Line Items]              
Proceeds from sale of plant assets 2,800            
Nuclear Fuel | Materials and supplies              
Lessee, Lease, Description [Line Items]              
Proceeds from sale of plant assets $ 600            
Equipment              
Lessee, Lease, Description [Line Items]              
Operating lease, residual value of leased asset     1,600        
Equipment | PNM              
Lessee, Lease, Description [Line Items]              
Operating lease, residual value of leased asset     700        
Equipment | TNMP              
Lessee, Lease, Description [Line Items]              
Operating lease, residual value of leased asset     900        
Energy Storage              
Lessee, Lease, Description [Line Items]              
Operating lease assets, net of amortization     $ 101,500        
Energy Storage | PNM              
Lessee, Lease, Description [Line Items]              
Number of megawatts in battery storage facilities (in megawatts) | MW     100