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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating lease cost:    
Operating lease cost:   $ 28,835
Amounts capitalized $ (1,672) (2,417)
Other operating leases 15,285 26,418
Financing lease cost:    
Amortization of right-of-use assets 9,253 6,529
Interest on lease liabilities 1,060 659
Amounts capitalized (7,440) (5,471)
Total financing lease expense 2,873 1,717
Variable lease expense 1,342 890
Short-term lease expense (1) 782 3,109
Total lease expense for the period 20,282 32,134
Cooling Towers    
Financing lease cost:    
Short-term lease expense (1)   2,700
Insurance settlements receivable   2,700
Battery storage leases    
Operating lease cost:    
Operating lease cost: 4,351  
Other operating leases    
Operating lease cost:    
Operating lease cost: 12,606  
PNM    
Operating lease cost:    
Operating lease cost:   26,764
Amounts capitalized (374) (690)
Other operating leases 15,104 26,074
Financing lease cost:    
Amortization of right-of-use assets 4,566 3,175
Interest on lease liabilities 562 327
Amounts capitalized (3,190) (2,264)
Total financing lease expense 1,938 1,238
Variable lease expense 1,342 890
Short-term lease expense (1) 675 3,058
Total lease expense for the period 19,059 31,260
PNM | Battery storage leases    
Operating lease cost:    
Operating lease cost: 4,351  
PNM | Other operating leases    
Operating lease cost:    
Operating lease cost: 11,127  
TNMP    
Operating lease cost:    
Operating lease cost:   2,020
Amounts capitalized (1,298) (1,728)
Other operating leases 181 292
Financing lease cost:    
Amortization of right-of-use assets 4,634 3,279
Interest on lease liabilities 497 330
Amounts capitalized (4,250) (3,208)
Total financing lease expense 881 401
Variable lease expense 0 0
Short-term lease expense (1) 29 5
Total lease expense for the period 1,091 $ 698
TNMP | Battery storage leases    
Operating lease cost:    
Operating lease cost: 0  
TNMP | Other operating leases    
Operating lease cost:    
Operating lease cost: $ 1,479