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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Apr. 30, 2025
USD ($)
Jan. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
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     (1,383) (6,457)      
Unamortized cost, right-of-way lease payments     70,800   $ 67,100    
Operating lease, right-of-use asset, amortization expense     $ 1,100 1,100      
Non-lease component, percent of lease liability     25.50%        
Lessee, operating lease, unguaranteed residual value     $ 23,600        
Lease to be executed, fixed consideration     $ 226,300        
Lease to be executed, term of contract     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     $ 1,500        
Public Service Company of New Mexico              
Operating Leased Assets [Line Items]              
Proceeds from sale of plant assets     0 2,840      
Materials and supplies     90 (3,612)      
Lessee, operating lease, unguaranteed residual value     13,200        
Public Service Company of New Mexico | Equipment              
Operating Leased Assets [Line Items]              
Operating lease, residual value of leased asset     700        
Texas-New Mexico Power Company              
Operating Leased Assets [Line Items]              
Materials and supplies     (1,474) $ (2,845)      
Lessee, operating lease, unguaranteed residual value     10,200        
Texas-New Mexico Power Company | Equipment              
Operating Leased Assets [Line Items]              
Operating lease, residual value of leased asset     800        
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        
Navajo Nation | Public Service Company of New Mexico | Subsequent Event              
Operating Leased Assets [Line Items]              
Right-of-way lease payments $ 8,800