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Lease Commitments - Schedule of Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Lease, Cost [Line Items]        
Amounts capitalized $ (92) $ (216) $ (350) $ (720)
Total operating lease expense 7,388 4,855 21,345 14,730
Financing lease cost:        
Amortization of right-of-use assets 2,956 2,356 8,409 7,361
Interest on lease liabilities 421 300 1,171 891
Amounts capitalized (2,468) (1,882) (6,897) (5,822)
Total financing lease expense 909 774 2,683 2,430
Variable lease expense 6,555 433 19,690 1,226
Short-term lease expense 182 276 605 656
Total lease expense for the period 15,034 6,338 44,323 19,042
Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 5,493 2,947 15,660 8,840
Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 1,987 2,124 6,035 6,610
PNM        
Lease, Cost [Line Items]        
Amounts capitalized (11) (23) (33) (86)
Total operating lease expense 7,345 4,812 21,216 14,609
Financing lease cost:        
Amortization of right-of-use assets 1,255 1,042 3,686 3,379
Interest on lease liabilities 189 142 553 429
Amounts capitalized (941) (748) (2,719) (2,345)
Total financing lease expense 503 436 1,520 1,463
Variable lease expense 6,555 433 19,690 1,226
Short-term lease expense 173 182 542 534
Total lease expense for the period 14,576 5,863 42,968 17,832
PNM | Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 5,493 2,947 15,660 8,840
PNM | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 1,863 1,888 5,589 5,855
TNMP        
Lease, Cost [Line Items]        
Amounts capitalized (81) (192) (317) (634)
Total operating lease expense 24 25 73 89
Financing lease cost:        
Amortization of right-of-use assets 1,612 1,235 4,455 3,866
Interest on lease liabilities 220 146 577 445
Amounts capitalized (1,527) (1,133) (4,177) (3,476)
Total financing lease expense 305 248 855 835
Variable lease expense 0 0 0 0
Short-term lease expense 4 7 16 19
Total lease expense for the period 333 280 944 943
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 $ 105 $ 217 $ 390 $ 723