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Lease Commitments - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2023
USD ($)
Apr. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
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         14,283 10,353        
Operating lease, payments to lessor upon occurrence of certain events     $ 13,800   13,800          
Unamortized cost, right-of-way lease payments     57,500   57,500   $ 54,600      
Operating lease, right-of-use asset, amortization expense     900 $ 900 1,800 2,000        
Lessee, operating lease, unguaranteed residual value     25,100   25,100          
Lease to be executed, fixed consideration     $ 1,300,000   $ 1,300,000          
Lease to be executed, term of contract     20 years   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         11,334 9,076        
Lessee, operating lease, unguaranteed residual value     $ 13,100   13,100          
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         2,949 $ 1,277        
Lessee, operating lease, unguaranteed residual value     12,000   12,000          
Equipment                    
Operating Leased Assets [Line Items]                    
Operating lease, residual value of leased asset     2,000   2,000          
Equipment | PNM                    
Operating Leased Assets [Line Items]                    
Operating lease, residual value of leased asset     900   900          
Equipment | TNMP                    
Operating Leased Assets [Line Items]                    
Operating lease, residual value of leased asset     $ 1,100   $ 1,100          
PNM Owned Assets                    
Operating Leased Assets [Line Items]                    
Proceeds from sale of productive assets $ 33,700