v3.26.3
Lease Commitments - Schedule of Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Lease, Cost [Line Items]        
Amounts capitalized $ 0 $ (92) $ 0 $ (350)
Total operating lease expense 2,337 7,388 7,422 21,345
Financing lease cost:        
Amortization of right-of-use assets 3,749 2,956 11,094 8,409
Interest on lease liabilities 549 421 1,657 1,171
Amounts capitalized (3,220) (2,468) (9,505) (6,897)
Total financing lease expense 1,078 909 3,246 2,683
Variable lease expense 19,942 6,555 55,128 19,690
Short-term lease expense 234 182 634 605
Total lease expense for the period 23,591 15,034 66,430 44,323
Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 156 5,493 1,406 15,660
Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 2,181 1,987 6,016 6,035
PNM        
Lease, Cost [Line Items]        
Amounts capitalized 0 (11) 0 (33)
Total operating lease expense 2,295 7,345 7,297 21,216
Financing lease cost:        
Amortization of right-of-use assets 1,567 1,255 4,616 3,686
Interest on lease liabilities 216 189 676 553
Amounts capitalized (1,195) (941) (3,607) (2,719)
Total financing lease expense 588 503 1,685 1,520
Variable lease expense 19,942 6,555 55,128 19,690
Short-term lease expense 220 173 585 542
Total lease expense for the period 23,045 14,576 64,695 42,968
PNM | Energy storage leases        
Lease, Cost [Line Items]        
Operating lease cost 156 5,493 1,406 15,660
PNM | Other operating leases        
Lease, Cost [Line Items]        
Operating lease cost 2,139 1,863 5,891 5,589
TNMP        
Lease, Cost [Line Items]        
Amounts capitalized 0 (81) 0 (317)
Total operating lease expense 23 24 69 73
Financing lease cost:        
Amortization of right-of-use assets 2,086 1,612 6,185 4,455
Interest on lease liabilities 322 220 948 577
Amounts capitalized (2,025) (1,527) (5,898) (4,177)
Total financing lease expense 383 305 1,235 855
Variable lease expense 0 0 0 0
Short-term lease expense 10 4 26 16
Total lease expense for the period 416 333 1,330 944
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 $ 23 $ 105 $ 69 $ 390