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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Lease, Cost [Line Items]        
Operating lease cost   $ 2,869   $ 7,206
Amounts capitalized $ (237) (434) $ (505) (947)
Total operating lease expense 4,867 2,435 9,874 6,259
Financing lease cost:        
Amortization of right-of-use assets 2,463 2,235 5,005 4,329
Interest on lease liabilities 294 252 591 486
Amounts capitalized (1,917) (1,477) (3,940) (3,167)
Total financing lease expense 840 1,010 1,656 1,648
Variable lease expense 433 360 793 622
Short-term lease expense 165 149 381 299
Total lease expense for the period 6,305 3,954 12,704 8,828
Battery storage leases        
Lease, Cost [Line Items]        
Operating lease cost 2,947   5,893  
Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 2,157   4,486  
PNM        
Lease, Cost [Line Items]        
Operating lease cost   2,468   6,376
Amounts capitalized (28) (103) (63) (263)
Total operating lease expense 4,827 2,365 9,797 6,113
Financing lease cost:        
Amortization of right-of-use assets 1,120 1,123 2,337 2,132
Interest on lease liabilities 143 140 287 262
Amounts capitalized (756) (778) (1,597) (1,469)
Total financing lease expense 507 485 1,027 925
Variable lease expense 433 360 793 622
Short-term lease expense 148 145 352 292
Total lease expense for the period 5,915 3,355 11,969 7,952
PNM | Battery storage leases        
Lease, Cost [Line Items]        
Operating lease cost 2,947   5,893  
PNM | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 1,908   3,967  
TNMP        
Lease, Cost [Line Items]        
Operating lease cost   401   830
Amounts capitalized (209) (331) (442) (684)
Total operating lease expense 28 70 65 146
Financing lease cost:        
Amortization of right-of-use assets 1,315 1,098 2,631 2,162
Interest on lease liabilities 147 112 299 223
Amounts capitalized (1,161) (699) (2,343) (1,699)
Total financing lease expense 301 511 587 686
Variable lease expense 0 0 0 0
Short-term lease expense 7 1 12 1
Total lease expense for the period 336 $ 582 664 $ 833
TNMP | Battery storage leases        
Lease, Cost [Line Items]        
Operating lease cost 0   0  
TNMP | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost $ 237   $ 507