Lease Commitments - Schedule of Finance Lease Balance Sheet Information (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Financing leases: | ||
| Non-utility property | $ 72,240 | $ 65,366 |
| Accumulated depreciation | (31,788) | (27,928) |
| Non-utility property, net | 40,452 | 37,438 |
| Other current liabilities | 13,988 | 12,743 |
| Other deferred credits | 26,562 | 24,786 |
| PNM | ||
| Financing leases: | ||
| Non-utility property | 30,712 | 30,555 |
| Accumulated depreciation | (14,850) | (13,079) |
| Non-utility property, net | 15,862 | 17,476 |
| Other current liabilities | 5,718 | 5,764 |
| Other deferred credits | 10,177 | 11,740 |
| TNMP | ||
| Financing leases: | ||
| Non-utility property | 40,012 | 33,344 |
| Accumulated depreciation | (16,134) | (14,319) |
| Non-utility property, net | 23,878 | 19,025 |
| Other current liabilities | 7,893 | 6,604 |
| Other deferred credits | $ 16,024 | $ 12,456 |