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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Lease, Cost [Line Items]        
Operating lease cost   $ 4,346   $ 11,552
Amounts capitalized $ (216) (373) $ (720) (1,365)
Total operating lease expense 4,855 3,973 14,730 10,187
Financing lease cost:        
Amortization of right-of-use assets 2,356 2,389 7,361 6,718
Interest on lease liabilities 300 274 891 760
Amounts capitalized (1,882) (1,915) (5,822) (5,389)
Total financing lease expense 774 748 2,430 2,089
Variable lease expense 433 360 1,226 982
Short-term lease expense 276 190 656 490
Total lease expense for the period 6,338 5,271 19,042 13,748
Battery storage leases        
Lease, Cost [Line Items]        
Operating lease cost 2,947   8,840  
Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 2,124   6,610  
PNM        
Lease, Cost [Line Items]        
Operating lease cost   4,001   10,377
Amounts capitalized (23) (71) (86) (334)
Total operating lease expense 4,812 3,930 14,609 10,043
Financing lease cost:        
Amortization of right-of-use assets 1,042 1,193 3,379 3,325
Interest on lease liabilities 142 148 429 411
Amounts capitalized (748) (844) (2,345) (2,313)
Total financing lease expense 436 497 1,463 1,423
Variable lease expense 433 360 1,226 982
Short-term lease expense 182 174 534 438
Total lease expense for the period 5,863 4,961 17,832 12,886
PNM | Battery storage leases        
Lease, Cost [Line Items]        
Operating lease cost 2,947   8,840  
PNM | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 1,888   5,855  
TNMP        
Lease, Cost [Line Items]        
Operating lease cost   345   1,175
Amounts capitalized (192) (302) (634) (1,031)
Total operating lease expense 25 43 89 144
Financing lease cost:        
Amortization of right-of-use assets 1,235 1,183 3,866 3,345
Interest on lease liabilities 146 126 445 349
Amounts capitalized (1,133) (1,071) (3,476) (3,076)
Total financing lease expense 248 238 835 618
Variable lease expense 0 0 0 0
Short-term lease expense 7 7 19 22
Total lease expense for the period 280 $ 288 943 $ 784
TNMP | Battery storage leases        
Lease, Cost [Line Items]        
Operating lease cost 0   0  
TNMP | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost $ 217   $ 723