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Summary of the Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Schedule of Average Straight-Line Rates and Depreciation on Electric, Common, Intangible, and General Plant | Average straight-line rates used were as follows:
| Year ended December 31,
| 2024 |  | 2023 |  | 2022
PNM |  |  |  |  |
Electric plant | 2.87 | % |  | 2.67 | % |  | 2.55 | %
Common, intangible, and general plant | 14.06 |  |  | 7.64 |  |  | 7.83 |
TNMP | 3.74 |  |  | 3.77 |  |  | 3.72 |
Depreciation expense on electric, common, intangible, and general plant is as follows:
| Year ended December 31,
| 2024 |  | 2023 |  | 2022
| (In thousands)
PNM | $ | 188,035 |  |  | $ | 158,956 |  |  | $ | 163,162 |
TNMP | 124,976 |  |  | 110,675 |  |  | 96,131 |
Schedule of Inventory | Inventories consisted of the following at December 31:
| TXNM |  | PNM |  | TNMP
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
| (In thousands)
Fuel Oil | $ | 1,095 |  |  | $ | 896 |  |  | $ | 1,095 |  |  | $ | 896 |  |  | $ | — |  |  | $ | — |
Materials and supplies | 165,766 |  |  | 97,138 |  |  | 141,415 |  |  | 80,676 |  |  | 24,351 |  |  | 16,462 |
| $ | 166,861 |  |  | $ | 98,034 |  |  | $ | 142,510 |  |  | $ | 81,572 |  |  | $ | 24,351 |  |  | $ | 16,462 |

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483489/210-10-50-1 + Details
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