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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2025
USD ($)
Jan. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Operating Leased Assets [Line Items]                  
Proceeds from sale of plant assets         $ 0 $ 2,840      
Materials and supplies         (4,313) (17,110)      
Unamortized cost, right-of-way lease payments     $ 61,300   61,300   $ 67,100    
Operating lease, right-of-use asset, amortization expense     $ 1,200 $ 1,000 $ 2,200 2,100      
Non-lease component, percent of lease liability     25.50%   25.50%        
Lessee, operating lease, unguaranteed residual value     $ 25,200   $ 25,200        
Lease to be executed, fixed consideration     $ 226,300   $ 226,300        
Lease to be executed, term of contract     20 years   20 years        
Materials, Supplies, and Fuel Stock                  
Operating Leased Assets [Line Items]                  
Materials and supplies   $ 600              
PNM Owned Assets                  
Operating Leased Assets [Line Items]                  
Proceeds from sale of plant assets   3,400              
Net Utility Plant                  
Operating Leased Assets [Line Items]                  
Proceeds from sale of plant assets   $ 2,800              
Equipment                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset     $ 1,400   $ 1,400        
Public Service Company of New Mexico                  
Operating Leased Assets [Line Items]                  
Proceeds from sale of plant assets         0 2,840      
Materials and supplies         (375) (10,671)      
Lessee, operating lease, unguaranteed residual value     12,900   12,900        
Public Service Company of New Mexico | Equipment                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset     700   700        
Texas-New Mexico Power Company                  
Operating Leased Assets [Line Items]                  
Materials and supplies         (3,938) $ (6,439)      
Lessee, operating lease, unguaranteed residual value     12,200   12,200        
Texas-New Mexico Power Company | Equipment                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset     $ 700   700        
Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases | Public Service Company of New Mexico                  
Operating Leased Assets [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 Leases | Public Service Company of New Mexico                  
Operating Leased Assets [Line Items]                  
Number of leases, expiring | lease               4  
Number of leases under which lease term was extended | lease               1  
Navajo Nation | Public Service Company of New Mexico                  
Operating Leased Assets [Line Items]                  
Annual lease payments         $ 6,000        
Right-of-way lease payments $ 8,800