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Lease Commitments - Schedule of Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Lease, Cost [Line Items]        
Amounts capitalized $ (117) $ (237) $ (258) $ (505)
Total operating lease expense 6,979 4,867 13,957 9,874
Financing lease cost:        
Amortization of right-of-use assets 2,864 2,463 5,452 5,005
Interest on lease liabilities 411 294 750 591
Amounts capitalized (2,354) (1,917) (4,428) (3,940)
Total financing lease expense 921 840 1,774 1,656
Variable lease expense 6,579 433 13,135 793
Short-term lease expense 198 165 423 381
Total lease expense for the period 14,677 6,305 29,289 12,704
Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 5,084 2,947 10,167 5,893
Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 2,012 2,157 4,048 4,486
PNM        
Lease, Cost [Line Items]        
Amounts capitalized (11) (28) (22) (63)
Total operating lease expense 6,936 4,827 13,871 9,797
Financing lease cost:        
Amortization of right-of-use assets 1,230 1,120 2,431 2,337
Interest on lease liabilities 184 143 364 287
Amounts capitalized (898) (756) (1,778) (1,597)
Total financing lease expense 516 507 1,017 1,027
Variable lease expense 6,579 433 13,135 793
Short-term lease expense 178 148 369 352
Total lease expense for the period 14,209 5,915 28,392 11,969
PNM | Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 5,084 2,947 10,167 5,893
PNM | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 1,863 1,908 3,726 3,967
TNMP        
Lease, Cost [Line Items]        
Amounts capitalized (106) (209) (236) (442)
Total operating lease expense 25 28 49 65
Financing lease cost:        
Amortization of right-of-use assets 1,549 1,315 2,843 2,631
Interest on lease liabilities 213 147 357 299
Amounts capitalized (1,455) (1,161) (2,650) (2,343)
Total financing lease expense 307 301 550 587
Variable lease expense 0 0 0 0
Short-term lease expense 8 7 12 12
Total lease expense for the period 340 336 611 664
TNMP | Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 0 0 0 0
TNMP | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost $ 131 $ 237 $ 285 $ 507