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Regulatory and Rate Matters - Schedule of Renewable Energy Rider (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PNM | Renewable energy rider | NMPRC
Public Utilities, General Disclosures [Line Items]
Revenue from renewable energy rider	$ 56.9	$ 60.3	$ 61.7

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Public Utilities, Revenue from Renewable energy rider

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