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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Lease, Cost [Line Items]    
Amounts capitalized $ (141) $ (267)
Total operating lease expense 6,978 5,009
Financing lease cost:    
Amortization of right-of-use assets 2,588 2,542
Interest on lease liabilities 339 297
Amounts capitalized (2,074) (2,023)
Total financing lease expense 853 816
Variable lease expense 6,556 360
Short-term lease expense 225 216
Total lease expense for the period 14,612 6,401
Energy storage leases    
Lease, Cost [Line Items]    
Operating lease cost 5,083 2,947
Other operating leases    
Lease, Cost [Line Items]    
Operating lease cost 2,036 2,329
PNM    
Lease, Cost [Line Items]    
Amounts capitalized (11) (35)
Total operating lease expense 6,935 4,971
Financing lease cost:    
Amortization of right-of-use assets 1,201 1,218
Interest on lease liabilities 180 144
Amounts capitalized (880) (841)
Total financing lease expense 501 521
Variable lease expense 6,556 360
Short-term lease expense 191 204
Total lease expense for the period 14,183 6,056
PNM | Energy storage leases    
Lease, Cost [Line Items]    
Operating lease cost 5,083 2,947
PNM | Other operating leases    
Lease, Cost [Line Items]    
Operating lease cost 1,863 2,059
TNMP    
Lease, Cost [Line Items]    
Amounts capitalized (130) (232)
Total operating lease expense 24 38
Financing lease cost:    
Amortization of right-of-use assets 1,294 1,316
Interest on lease liabilities 144 152
Amounts capitalized (1,195) (1,182)
Total financing lease expense 243 286
Variable lease expense 0 0
Short-term lease expense 4 6
Total lease expense for the period 271 330
TNMP | Energy storage leases    
Lease, Cost [Line Items]    
Operating lease cost 0 0
TNMP | Other operating leases    
Lease, Cost [Line Items]    
Operating lease cost $ 154 $ 270