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Variable Interest Entities - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) MW	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) MW	Sep. 30, 2023 USD ($)	Dec. 05, 2022 MW	Jan. 31, 2016 USD ($)
San Juan Generating Station | Coal supply
Variable Interest Entity [Line Items]
Cash used to support bank letter or credit arrangement						$ 30.3
PNM
Variable Interest Entity [Line Items]
Number of megawatts purchased (in megawatts) | MW					64.1
PNM | Valencia
Variable Interest Entity [Line Items]
Payment for fixed costs	$ 5.2	$ 5.1	$ 15.3	$ 15.2
Payment for variable costs	$ 1.5	$ 1.4	$ 2.0	$ 4.1
Long-term contract option to purchase, ownership percentage (up to)			50.00%
Long-term contract option to purchase, purchase price - percentage of adjusted NBV			50.00%
Long-term contract option to purchase, purchase price - percentage of FMV			50.00%
PNM | Purchased through May 2028 | Valencia
Variable Interest Entity [Line Items]
Number of megawatts purchased (in megawatts) | MW	155		155

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