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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

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-Topic 210
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