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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2025
USD ($)
Jan. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
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         (6,125) (22,484)      
Unamortized cost, right-of-way lease payments     $ 69,700   69,700   $ 67,100    
Operating lease, right-of-use asset, amortization expense     $ 1,100 $ 1,100 $ 3,300 3,200      
Non-lease component, percent of lease liability     25.50%   25.50%        
Lessee, operating lease, unguaranteed residual value     $ 30,200   $ 30,200        
Lease to be executed, fixed consideration     $ 94,300   $ 94,300        
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     $ 1,300   $ 1,300        
Public Service Company of New Mexico                  
Operating Leased Assets [Line Items]                  
Proceeds from sale of plant assets         0 2,840      
Materials and supplies         114 (13,928)      
Lessee, operating lease, unguaranteed residual value     15,200   15,200        
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         (6,239) $ (8,556)      
Lessee, operating lease, unguaranteed residual value     14,700   14,700        
Texas-New Mexico Power Company | Equipment                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset     $ 600   600        
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