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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) - PNM - Designated as Hedging Instrument - Commodity derivatives - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Other current assets	$ 416	$ 9,780
Other deferred charges	0	0
Derivative asset	416	9,780
Other current liabilities	(27,074)	(19,209)
Other deferred credits	0	0
Derivative liability	(27,074)	(19,209)
Net	$ (26,658)	$ (9,429)

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