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Income Taxes - Other Disclosures (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Internal Revenue Service (IRS) |  |  |
Reconciliation of Unrecognized Tax Benefits (Expenses) [Line Items] |  |  |
Federal net operating loss carryforwards | $ 186,200,000 |  |
Federal tax credit carryforwards that expire beginning in 2024 | 129,000,000.0 |  |
TXNM |  |  |
Reconciliation of Unrecognized Tax Benefits (Expenses) [Line Items] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 14,900,000 |  |
Unrecognized tax benefits, interest on income taxes expense | 0 | $ 0 | $ 0
PNM |  |  |
Reconciliation of Unrecognized Tax Benefits (Expenses) [Line Items] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 11,900,000 |  |
Unrecognized tax benefits, interest on income taxes expense | 0 | 0 | 0
TNMP |  |  |
Reconciliation of Unrecognized Tax Benefits (Expenses) [Line Items] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 200,000 |  |
Unrecognized tax benefits, interest on income taxes expense | $ 0 | $ 0 | $ 0

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