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Regulatory and Rate Matters - Renewable Energy Rider (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Service Company of New Mexico | Renewable Energy Rider | NMPRC
Public Utilities, General Disclosures [Line Items]
Revenue from renewable energy rider	$ 61.7	$ 56.4	$ 52.0

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Public Utilities, Revenue from Renewable energy rider

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