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Fair Value of Derivative and Other Financial Instruments - Gross Realized (Losses) (Details) - PNM - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings	$ 2,000	$ (600)	$ 17,000	$ 2,800
Proceeds from sales	332,896	137,797	745,645	412,574
Gross realized gains	5,051	4,022	26,279	14,464
Gross realized (losses)	$ (2,613)	$ (6,876)	$ (15,185)	$ (19,088)

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