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Commitments and Contingencies - Nuclear Spent Fuel and Waste Disposal (Narrative) (Details) - PNM - PVNGS (Nuclear) - Nuclear Spent Fuel and Waste Disposal - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Estimate of possible loss		$ 55.6
Other Deferred Credits
Loss Contingencies [Line Items]
Liability for interim storage costs	$ 13.4	$ 11.0

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