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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 31, 2023
USD ($)
Apr. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Apr. 02, 2021
lease
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Operating Leased Assets [Line Items]                
Proceeds from sale of productive assets     $ 28,372 $ 0        
Reduction to inventories     (2,443) 5,183        
Operating lease, payments to lessor upon occurrence of certain events     13,800          
Unamortized cost, right-of-way lease payments     58,300   $ 54,600      
Operating lease, right-of-use asset, amortization expense     900 1,000        
Lessee, operating lease, unguaranteed residual value     25,100          
Lease to be executed, fixed consideration     $ 1,300,000          
Lease to be executed, term of contract     20 years          
Materials, Supplies, and Fuel Stock                
Operating Leased Assets [Line Items]                
Reduction to inventories     $ (5,300)          
PNM                
Operating Leased Assets [Line Items]                
Number of leases under which lease term was extended | lease           5    
Proceeds from sale of productive assets     28,372 0        
Reduction to inventories     (2,916) 4,636        
Lessee, operating lease, unguaranteed residual value     12,300          
PNM | Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases                
Operating Leased Assets [Line Items]                
Number of leases, expiring | lease               4
Number of leases under which lease term was extended | lease               4
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases                
Operating Leased Assets [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     1,600          
PNM | Navajo Nation                
Operating Leased Assets [Line Items]                
Annual lease payments     6,000          
Right-of-way lease payments   $ 8,300            
TNMP                
Operating Leased Assets [Line Items]                
Reduction to inventories     473 $ 547        
Lessee, operating lease, unguaranteed residual value     12,800          
Equipment                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset     2,100          
Equipment | PNM                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset     1,000          
Equipment | TNMP                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset     $ 1,200          
PNM Owned Assets                
Operating Leased Assets [Line Items]                
Proceeds from sale of productive assets $ 33,700