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Lease Commitments - Components of Lease Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Lease, Cost [Line Items] |  |  |  |
Operating lease cost |  | $ 4,346 |  | $ 11,552
Amounts capitalized | $ (216) | (373) | $ (720) | (1,365)
Total operating lease expense | 4,855 | 3,973 | 14,730 | 10,187
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 2,356 | 2,389 | 7,361 | 6,718
Interest on lease liabilities | 300 | 274 | 891 | 760
Amounts capitalized | (1,882) | (1,915) | (5,822) | (5,389)
Total financing lease expense | 774 | 748 | 2,430 | 2,089
Variable lease expense | 433 | 360 | 1,226 | 982
Short-term lease expense | 276 | 190 | 656 | 490
Total lease expense for the period | 6,338 | 5,271 | 19,042 | 13,748
Battery storage leases |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost | 2,947 |  | 8,840 |
Other operating leases |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost | 2,124 |  | 6,610 |
PNM |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost |  | 4,001 |  | 10,377
Amounts capitalized | (23) | (71) | (86) | (334)
Total operating lease expense | 4,812 | 3,930 | 14,609 | 10,043
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 1,042 | 1,193 | 3,379 | 3,325
Interest on lease liabilities | 142 | 148 | 429 | 411
Amounts capitalized | (748) | (844) | (2,345) | (2,313)
Total financing lease expense | 436 | 497 | 1,463 | 1,423
Variable lease expense | 433 | 360 | 1,226 | 982
Short-term lease expense | 182 | 174 | 534 | 438
Total lease expense for the period | 5,863 | 4,961 | 17,832 | 12,886
PNM | Battery storage leases |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost | 2,947 |  | 8,840 |
PNM | Other operating leases |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost | 1,888 |  | 5,855 |
TNMP |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost |  | 345 |  | 1,175
Amounts capitalized | (192) | (302) | (634) | (1,031)
Total operating lease expense | 25 | 43 | 89 | 144
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 1,235 | 1,183 | 3,866 | 3,345
Interest on lease liabilities | 146 | 126 | 445 | 349
Amounts capitalized | (1,133) | (1,071) | (3,476) | (3,076)
Total financing lease expense | 248 | 238 | 835 | 618
Variable lease expense | 0 | 0 | 0 | 0
Short-term lease expense | 7 | 7 | 19 | 22
Total lease expense for the period | 280 | $ 288 | 943 | $ 784
TNMP | Battery storage leases |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost | 0 |  | 0 |
TNMP | Other operating leases |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost | $ 217 |  | $ 723 |

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