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Summary of the Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment | Average straight-line rates used were as follows:
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
PNM |  |  |  |  |
Electric plant | 2.67 | % |  | 2.55 | % |  | 2.48 | %
Common, intangible, and general plant | 7.64 |  |  | 7.83 |  |  | 7.91 |
TNMP | 3.77 |  |  | 3.72 |  |  | 3.88 |
Depreciation on electric, common, intangible, and general plant is as follows:
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
| (In thousands)
PNM | $ | 158,956 |  |  | $ | 163,162 |  |  | $ | 153,165 |
TNMP | 110,675 |  |  | 96,131 |  |  | 87,900 |
Schedule of Inventory | Inventories consisted of the following at December 31:
| PNMR |  | PNM |  | TNMP
| 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
| (In thousands)
Fuel Oil | $ | 896 |  |  | $ | 985 |  |  | $ | 896 |  |  | $ | 985 |  |  | $ | — |  |  | $ | — |
Materials and supplies | 97,138 |  |  | 65,748 |  |  | 80,676 |  |  | 54,905 |  |  | 16,462 |  |  | 10,843 |
| $ | 98,034 |  |  | $ | 66,733 |  |  | $ | 81,572 |  |  | $ | 55,890 |  |  | $ | 16,462 |  |  | $ | 10,843 |

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