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Summary of the Business and Significant Accounting Policies - Schedule of Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 166,861 | $ 98,034
Fuel Oil |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 1,095 | 896
Materials and supplies |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 165,766 | 97,138
PNM |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 142,510 | 81,572
PNM | Fuel Oil |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 1,095 | 896
PNM | Materials and supplies |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 141,415 | 80,676
TNMP |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 24,351 | 16,462
TNMP | Fuel Oil |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 0 | 0
TNMP | Materials and supplies |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 24,351 | $ 16,462

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