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Lease Commitments - Components of Lease Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Operating lease cost: |  |
Operating lease cost: |  | $ 28,835
Amounts capitalized | $ (1,672) | (2,417)
Other operating leases | 15,285 | 26,418
Financing lease cost: |  |
Amortization of right-of-use assets | 9,253 | 6,529
Interest on lease liabilities | 1,060 | 659
Amounts capitalized | (7,440) | (5,471)
Total financing lease expense | 2,873 | 1,717
Variable lease expense | 1,342 | 890
Short-term lease expense (1) | 782 | 3,109
Total lease expense for the period | 20,282 | 32,134
Cooling Towers |  |
Financing lease cost: |  |
Short-term lease expense (1) |  | 2,700
Insurance settlements receivable |  | 2,700
Battery storage leases |  |
Operating lease cost: |  |
Operating lease cost: | 4,351 |
Other operating leases |  |
Operating lease cost: |  |
Operating lease cost: | 12,606 |
PNM |  |
Operating lease cost: |  |
Operating lease cost: |  | 26,764
Amounts capitalized | (374) | (690)
Other operating leases | 15,104 | 26,074
Financing lease cost: |  |
Amortization of right-of-use assets | 4,566 | 3,175
Interest on lease liabilities | 562 | 327
Amounts capitalized | (3,190) | (2,264)
Total financing lease expense | 1,938 | 1,238
Variable lease expense | 1,342 | 890
Short-term lease expense (1) | 675 | 3,058
Total lease expense for the period | 19,059 | 31,260
PNM | Battery storage leases |  |
Operating lease cost: |  |
Operating lease cost: | 4,351 |
PNM | Other operating leases |  |
Operating lease cost: |  |
Operating lease cost: | 11,127 |
TNMP |  |
Operating lease cost: |  |
Operating lease cost: |  | 2,020
Amounts capitalized | (1,298) | (1,728)
Other operating leases | 181 | 292
Financing lease cost: |  |
Amortization of right-of-use assets | 4,634 | 3,279
Interest on lease liabilities | 497 | 330
Amounts capitalized | (4,250) | (3,208)
Total financing lease expense | 881 | 401
Variable lease expense | 0 | 0
Short-term lease expense (1) | 29 | 5
Total lease expense for the period | 1,091 | $ 698
TNMP | Battery storage leases |  |
Operating lease cost: |  |
Operating lease cost: | 0 |
TNMP | Other operating leases |  |
Operating lease cost: |  |
Operating lease cost: | $ 1,479 |

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